Method and system for synthesizing received signal, radio receiving station and receiving station
Abstract
[Task] An object of the present invention is to provide a received signal synthesis method and system that can obtain a higher quality received signal at the receiving station while reducing the amount of transmitted information between each wireless receiving station and the receiving station as much as possible. is there.
Solution.The above object is to transmit a signal based on the received signal from a plurality of wireless receiving stations that receive an error correction encoded signal from the wireless transmitting station to the receiving station, and based on the signal received by the receiving station. In the received signal synthesis method in which the received information sequence is generated, each wireless receiving station performs error correction / decoding and error detection processing on the signal received from the wireless transmitting station, and an error is detected in the error detection processing. When it is not detected, the error correction / decoding result is transmitted to the receiving station, and when the receiving station receives the error correction / decoding result from any of the wireless transmitting stations, the received error correction / decoding result is the first. This is achieved by a received signal synthesis method in which a received information sequence is generated by synthesizing according to an algorithm.

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30 claims: 8 independent, 22 dependent
- 1【特許請求の範囲】 【請求項1】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成方法において、 各無線受信局では、無線送信局から受信した信号に対して誤り訂正復号及び誤り検出処理を行い、その誤り検出処理にて誤りが検出されなかったときにその誤り訂正復号結果を受信局に伝送し、 受信局では、いずれかの無線送信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成するようにした受信信号合成方法。
- 2【請求項2】請求項1記載の受信信号合成方法において、 各無線受信局では、上記誤り検出処理にて誤りが検出されたときに誤り訂正復号前の信号を受信局に伝送し、 受信局では、全ての無線受信局から上記誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成した後に誤り訂正復号を行って受信情報系列を生成するようにした受信信号合成方法。
- 3【請求項3】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成方法において、 各無線受信局では、無線送信局から受信した信号に対して誤り訂正復号及び誤り検出処理を行い、その誤り検出結果に応じた第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を受信局に伝送し、 受信局では、いずれかの無線受信局から上記第一の情報を受信したときに、その第一の情報の送信元となる無線受信局に対して第一の信号伝送命令を送信し、全ての無線受信局から上記第二の情報を受信したときに、全ての無線受信局に対して第二の信号伝送命令を伝送し、 更に、各無線受信局では、受信局から上記第一の信号伝送命令を受信したときに、誤り訂正復号結果を受信局に送信し、受信局から上記第二の信号伝送命令を受信したときに、誤り訂正復号前の信号を受信局に伝送し、 更に、受信局では、無線受信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成し、全ての受信局から誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成した後に誤り訂正復号を行って受信情報系列を生成するようにした受信信号合成方法。
- 4【請求項4】請求項1または2記載の受信信号合成方法において、 各無線受信局では、無線送信局にて誤り訂正符号化として組織符号化を施して得られた信号を当該無線送信局から受信して、繰り返し処理を伴った誤り訂正復号を行う際に、その処理を所定回数繰り返す毎に誤り検出処理を行い、その誤り検出処理の結果に応じて第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を受信局に送信し、 受信局では、全ての無線受信局から上記第二の情報を受信した場合に、全ての無線受信局に対して復号の継続を指示し、いずれかの無線受信局から上記第一の情報を受信した場合に、当該第一の情報の送信元となる無線受信局に対して誤り訂正復号結果を送信する旨を指示し、 更に、無線受信局では、上記受信局から復号の継続を指示された場合に、繰り返し処理を伴った誤り訂正復号を継続し、上記受信局から誤り訂正復号結果を送信する旨を指示された場合に、誤り訂正復号結果を受信局に伝送するようにした受信信号合成方法。
- 5【請求項5】請求項4記載の受信信号合成方法において、 上記受信局では、いずれかの無線受信局から上記第一の情報を受信した場合に、当該第一の情報の送信元となる無線受信局以外の無線受信局に対して誤り訂正復号を停止する旨を指示し、 無線受信局では、上記受信局から誤り訂正復号を停止する旨を指示された場合に、その繰り返し処理のなされている誤り訂正復号を停止するようにした受信信号合成方法。
- 6【請求項6】請求項1乃至5いずれか記載の受信信号合成方法において、 各無線受信局では、無線送信局から信号を受信する際の受信SIRを検出して、誤り訂正復号結果を上記受信局に伝送する際に、その検出した受信SIRを当該受信局に伝送し、 上記受信局では、受信した受信SIRに基づいて決められた誤り訂正復号結果を上記第一のアルゴリズムに従って合成するようにした受信信号合成方法。
- 7【請求項7】請求項6記載の受信信号合成方法において、 上記受信局では、最も大きい受信SIRの送信元となる無線受信局からの誤り訂正復号結果を合成して受信情報系列を生成するようにした受信信号合成方法。
- 8【請求項8】請求項1乃至7いずれか記載の受信信号合成方法において、 上記第一のアルゴリズムに従った合成は、選択合成となる受信信号合成方法。
- 9【請求項9】請求項2乃至7いずれか記載の受信信号合成方法において、 上記第二のアルゴリズムに従った合成は、最大比合成となる受信信号合成方法。
- 10【請求項10】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、誤り訂正復号前の信号として復調器の出力を量子化した信号を上記受信局に伝送するに際し、復調器のIチャネル出力信号とQチャネル出力信号とからなる2次元の情報に対応する量子化テーブルを作成し、この量子化テーブルを参照して復調器の出力を量子化するようにした受信信号合成方法。
- 11【請求項11】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、誤り訂正復号前の信号として復調器の出力を量子化した信号を上記受信局に伝送するに際し、時間的に連続する復調器のIチャネル出力信号とQチャネル出力信号とをまとめた情報に対応する量子化テーブルを作成し、この量子化テーブルを参照して復調器の出力を量子化するようにした受信信号合成方法。
- 12【請求項12】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、誤り訂正復号前の信号として復調器の出力を量子化した信号を上記受信局に伝送するに際して、復調器出力信号から算出される平均値及び分散を用いて逐次的に量子化テーブルを作成し、この量子化テーブルを参照して復調器の出力を量子化するようにした受信信号合成方法。
- 13【請求項13】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、誤り訂正復号前の信号を量子化して上記受信局に伝送するに際して、当該誤り訂正復号前の信号から推定される受信SIRに基づいて量子化ビット数を決定し、その決定されたビット数にて上記誤り訂正復号前の信号を量子化するようにした受信信号合成方法。
- 14【請求項14】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、無線送信局にて誤り訂正符号化として組織符号化を施して得られた信号を当該無線送信局から受信して、繰り返し処理を伴った誤り訂正復号を行う前の信号を量子化して得られる信号を上記受信局に伝送するに際して、誤り訂正復号を行う前の信号の組織部と冗長部に対してそれぞれ異なった量子化テーブルを作成し、それぞれの量子化テーブルを参照して上記組織部と冗長部を量子化するようにした受信信号合成方法。
- 15【請求項15】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、誤り訂正復号前の信号を量子化して上記受信局に伝送するに際して、受信局と当該無線受信局との間の伝送情報量の状態に応じて量子化ビット数を決定し、その決定されたビット数にて上記誤り訂正復号前の信号を量子化するようにした受信信号合成方法。
- 16【請求項16】請求項2乃至9いずれか記載の受信信号合成方法において、 各無線受信局では、誤り訂正復号前の信号を量子化して上記受信局に伝送するに際して、受信局から要求される通信品質に応じて量子化ビット数を決定し、その決定されたビット数にて上記誤り訂正復号前の信号を量子化するようにした受信信号合成方法。
- 17【請求項17】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成システムにおいて、 各無線受信局は、無線送信局から受信した信号に対して誤り訂正復号を行う第一の誤り訂正復号手段と、上記受信した信号に対して誤り検出処理を行う誤り検出手段と、該誤り検出手段にて誤りが検出されなかったときに、上記第一の誤り訂正復号手段により得られた誤り訂正復号結果を受信局に伝送する第一の伝送制御手段とを有し、 上記受信局は、いずれかの無線受信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成する第一の合成手段を有する受信信号合成システム。
- 18【請求項18】請求項17記載の受信信号合成システムにおいて、 各無線受信局は、上記誤り検出手段にて誤りが検出されたときに誤り訂正復号前の信号を受信局に伝送する第二の伝送制御手段とを有し、 上記受信局は、全ての無線受信局から上記誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成する第二の合成手段と、該第二の合成手段にて得られた信号に対して誤り訂正復号を行って受信情報系列を生成する第二の誤り訂正復号手段とを有する受信信号合成システム。
- 19【請求項19】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成システムにおいて、 各無線受信局は、無線送信局から受信した信号に対して誤り訂正復号を行う第一の誤り訂正復号手段と、上記受信した信号に対して誤り検出処理を行う誤り検出手段と、該誤り検出手段での誤り検出結果に応じた第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を受信局に伝送する誤り状態情報伝送制御手段とを有し、 受信局は、いずれかの無線受信局から上記第一の情報を受信したときに、その第一の情報の送信元となる無線受信局に対して第一の信号伝送命令を送信する第一の信号伝送命令手段と、全ての無線受信局から上記第二の情報を受信したときに、全ての無線受信局に対して第二の信号伝送命令を伝送する第二の信号伝送命令手段とを有し、 各無線受信局は、更に、受信局から上記第一の信号伝送命令を受信したときに、誤り訂正復号結果を受信局に送信する第一の伝送制御手段と、上記受信局から上記第二の信号伝送命令を受信したときに、誤り訂正復号前の信号を受信局に伝送する第二の伝送制御手段とを有し、 受信局は、更に、無線受信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成する第一の合成手段と、全ての受信局から誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成する第二の合成手段と、該第二の合成手段にて得られた信号に対して誤り訂正復号を行って受信情報系列を生成する第二の誤り訂正復号手段とを有する受信信号合成システム。
- 20【請求項20】請求項17または18記載の受信信号合成システムにおいて、 上記第一の誤り訂正復号手段は、無線送信局にて誤り訂正符号化として組織符号化を施して得られた信号を当該無線送信局から受信して、繰り返し処理を伴った誤り訂正復号を行う組織符号化対応復号手段であり、 各無線受信局は、上記組織符号化対応復号手段にてその処理を所定回数繰り返す毎に上記誤り検出手段にて得られる誤り検出処理の結果に応じて第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を受信局に送信する誤り状態情報伝送制御手段を有し、 受信局は、全ての無線受信局から上記第二の情報を受信した場合に、全ての無線受信局に対して復号の継続を指示する第一の指示手段と、いずれかの無線受信局から上記第一の情報を受信した場合に、当該第一の情報の送信元となる無線受信局に対して誤り訂正復号結果を送信する旨を指示する第二の指示手段とを有し、 各無線受信局では、上記受信局から復号の継続を指示された場合に、上記組織符号化対応復号手段による繰り返し処理を伴った誤り訂正復号を継続し、上記受信局から誤り訂正復号結果を送信する旨を指示された場合に、上記組織符号化対応復号手段にて得られた誤り訂正復号結果を受信局に伝送するようにした受信信号合成システム。
- 21【請求項21】請求項20記載の受信信号合成システムにおいて、 上記受信局は、更に、いずれかの無線受信局から上記第一の情報を受信した場合に、当該第一の情報の送信元なる無線受信局以外の無線受信局に対して誤り訂正復号を停止する旨を指示する第三の指示手段を有し、 無線受信局では、受信局から誤り訂正復号を停止する旨を指示された場合に、その繰り返し処理のなされている誤り訂正復号を停止するようにした受信信号合成システム。
- 22【請求項22】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成方法に適用される無線受信局において、 無線送信局から受信した信号に対して誤り訂正復号を行う誤り訂正復号手段と、 上記受信した信号に対して誤り検出処理を行う誤り検出手段と、 該誤り検出手段での誤り検出処理にて誤りが検出されなかったときにその誤り訂正復号結果を受信局に伝送する第一の伝送制御手段とを有し、 受信局において、該無線送信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成できるようにした無線受信局。
- 23【請求項23】請求項22記載の無線受信局にいおて、 上記誤り検出手段にて誤りが検出されたときに誤り訂正復号前の信号を受信局に伝送する第二の伝送制御手段を有し受信局において、全ての無線受信局から上記誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成した後に誤り訂正復号を行って受信情報系列を生成できるようにした無線受信局。
- 24【請求項24】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成方法に適用される無線受信局において、 無線送信局から受信した信号に対して誤り訂正復号を行う誤り訂正復号手段と、 上記受信した信号に対する誤り検出処理を行う誤り検出手段と、 該誤り検出手段にて得られた誤り検出結果に応じた第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を受信局に伝送する誤り状態情報伝送制御手段とを有し、 受信局において、該無線受信局から上記第一の情報を受信したときに、その第一の情報の送信元となる無線受信局に対して第一の信号伝送命令を送信できるようにすると共に、全ての無線受信局から上記第二の情報を受信したときに、全ての無線受信局に対して第二の信号伝送命令を伝送できるようにし、 更に、受信局から上記第一の信号伝送命令を受信したときに、誤り訂正復号結果を受信局に送信する第一の伝送制御手段と、受信局から上記第二の信号伝送命令を受信したときに、誤り訂正復号前の信号を受信局に伝送する第二の伝送制御手段とを有し、 更に、受信局において、当該無線受信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成し、全ての受信局から誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成した後に誤り訂正復号を行って受信情報系列を生成できるようにした無線受信局。
- 25【請求項25】請求項22または23記載の無線受信局において、 上記誤り訂正復号手段は、無線送信局にて誤り訂正符号化として組織符号化を施して得られる信号を当該無線送信局から受信して、繰り返し処理を伴った誤り訂正復号を行う組織符号化対応復号手段であり、 上記組織符号化対応復号手段にてその処理を所定回数繰り返す毎に上記誤り検出手段にて得られる誤り検出処理の結果に応じて第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を受信局に送信する誤り状態情報伝送制御手段を有し、 受信局において、全ての無線受信局から上記第二の情報を受信した場合に、全ての無線受信局に対して復号の継続を指示できるようにすると共に、当該無線受信局から上記第一の情報を受信した場合に、当該無線受信局に対して誤り訂正復号結果を送信する旨を指示できるようにし、 更に、上記受信局から復号の継続を指示された場合に、上記組織符号化対応復号手段による繰り返し処理を伴った誤り訂正復号を継続し、上記受信局から誤り訂正復号結果を送信する旨を指示された場合に、上記組織符号化対応復号手段にて得られた誤り訂正復号結果を受信局に伝送するようにした無線受信局。
- 26【請求項26】請求項25記載の無線受信局において、 更に、受信局から誤り訂正復号を停止する旨を指示された場合に、上記組織符号化対応復号手段により繰り返し処理のなされている誤り訂正復号を停止するようにした無線受信局。
- 27【請求項27】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成方法に適用される受信局において、 いずれかの無線受信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成する第一の合成手段と、 全ての無線受信局から上記誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成する第二の合成手段と、 該第二の合成手段にて得られた信号に対して誤り訂正復号を行って受信情報系列を生成する誤り訂正復号手段とを有する受信局。
- 28【請求項28】無線送信局から誤り訂正符号化された信号を受信する複数の無線受信局から当該受信信号に基づいた信号を受信局に対して送信し、受信局にて受信される信号に基づいて受信情報系列を生成するようにした受信信号合成方法に適用される受信局において、 いずれかの無線受信局からの誤り検出処理の結果に応じた第一の情報を受信したときに、その第一の情報の送信元となる無線受信局に対して第一の信号伝送命令を送信する第一の信号伝送命令手段と、全ての無線受信局から上記第一の情報より誤りの程度の大きい状態を表す第二の情報を受信したときに、全ての無線受信局に対して第二の信号伝送命令を伝送する第二の信号伝送命令手段と、 上記第一の信号伝送命令に応答して無線受信局から誤り訂正復号結果を受信したときに、その受信した誤り訂正復号結果を第一のアルゴリズムに従って合成して受信情報系列を生成する第一の合成手段と、 上記第二の信号伝送命令に応答して全ての受信局から誤り訂正復号前の信号を受信したときに、その受信した信号を第二のアルゴリズムに従って合成する第二の合成手段と、 該第二の合成手段にて得られた信号に対して誤り訂正復号を行って受信情報系列を生成する誤り訂正復号手段とを有する受信局。
- 29【請求項29】請求項28記載の受信局において、 組織符号化に対応して繰り返し処理を伴った誤り訂正復号を行う際にその処理を所定回数繰り返す毎に誤り検出処理にて得られる結果に応じて第一の情報または該第一の情報より誤りの程度の大きい状態を表す第二の情報を当該受信局に送信する各無線受信局と信号の送受信を行い、 全ての無線受信局から上記第二の情報を受信した場合に、全ての無線受信局に対して復号の継続を指示する第一の指示手段と、 いずれかの無線受信局から上記第一の情報を受信した場合に、当該第一の情報の送信元となる無線受信局に対して誤り訂正復号結果を送信する旨を指示する第二の指示手段とを有する受信局。
- 30【請求項30】請求項29記載の受信局において、 更に、いずれかの無線受信局から上記第一の情報を受信した場合に、当該第一の情報の送信元となる無線受信局以外の無線受信局に対して誤り訂正復号を停止する旨を指示する第三の指示手段を有する受信局。
Independent claims30
253 paragraphs in 1 section, as filed
Description: TECHNICAL FIELD [Detailed description of the invention]
【0001】
[Technical field to which the invention belongs]
The present invention relates to a received signal synthesis method and a system, and more specifically, a signal from a wireless transmitting station is received by a plurality of wireless receiving stations, and a received signal is generated based on the received signals at the plurality of wireless receiving stations. The present invention relates to a received signal synthesis method and a system.
【0002】
Further, the present invention relates to a radio receiving station and a receiving station applied to the received signal synthesis method as described above.
【0003】
[Conventional technology]
Conventionally, for example, a wireless transmission system such as a mobile communication system that realizes uplink site diversity has a plurality of wireless receiving stations 2 (for example, a base station) in a receiving station 3 (for example, a control station) as shown in FIG. ) Is connected, and the radio transmitting station 1 (for example, a mobile device) is connected to these plurality of radio receiving stations 2 on a radio transmission line to communicate with each other. In such a wireless transmission system, each wireless receiving station 2 receives and demodulates radio waves transmitted from the wireless transmitting station 1 through error correction coding and modulation processing, and further performs error correction and decoding. It is transmitting to the receiving station 3. Then, the receiving station 3 generates a received signal by selectively synthesizing the error correction / decoding result from each wireless receiving station 2.
【0004】
With such a wireless transmission system, even if the transmission characteristics in the wireless transmission line between the wireless transmission station 1 and the wireless reception station 2 deteriorate due to shadowing or the like, the quality of the received signal obtained by the reception station 3 deteriorates. Can be reduced as much as possible.
【0005】
Further, in the above wireless transmission system, each wireless receiving station 2 transmits the demodulated output to the receiving station 3 without performing error correction decoding, and the receiving station 3 synthesizes those signals at the maximum ratio and then performs error correction. Decryption is possible. According to such a method, the quality of the received signal can be further improved.
【0006】
[Problems to be Solved by the Invention]
As described above, according to the method in which the receiving station 3 synthesizes the demodulated outputs from the plurality of wireless receiving stations 2 at the maximum ratio and then corrects and decodes the error, the quality of the received signal can be improved. Since the demodulated output of the receiving station 2 is transmitted between the wireless receiving station 2 and the receiving station 3, the amount of transmission information between the wireless receiving station and the receiving station becomes large. Therefore, the transmission capacity of the transmission line (wired or wireless) between the wireless receiving station and the receiving station must be set large.
【0007】
Therefore, the first object of the present invention is a reception signal synthesis method and system that can obtain a higher quality reception signal at the reception station while reducing the amount of transmission information between each radio reception station and the reception station as much as possible. Is to provide.
【0008】
A second object of the present invention is to provide a radio receiving station that can be applied to such a received signal synthesis method.
【0009】
Furthermore, a third object of the present invention is to provide a receiving station that can be applied to such a received signal synthesis method.
【0010】
[Means for solving problems]
In order to solve the first problem, the present invention is based on the received signal from a plurality of radio receiving stations that receive an error correction encoded signal from the radio transmitting station, as described in claim 1. In a received signal synthesis method in which a signal is transmitted to a receiving station and a reception information sequence is generated based on the signal received by the receiving station, each wireless receiving station uses the signal received from the wireless transmitting station. On the other hand, error correction decoding and error detection processing are performed, and when an error is not detected in the error detection processing, the error correction / decoding result is transmitted to the receiving station. When the correction / decoding result is received, the received error correction / decoding result is synthesized according to the first algorithm to generate a received information sequence.
【0011】
In such a received signal synthesis method, when an error is not detected in any of the wireless receiving stations, the error correction / decoding result is transmitted from the wireless receiving station to the receiving station. Then, the error correction / decoding result received at the receiving station is synthesized according to the first algorithm to generate a received information sequence.
【0012】
The processing when an error is detected in the wireless receiving station is not particularly limited. For example, the radio receiving station where the error is detected may not transmit any signal to the receiving station. Further, from the viewpoint of further improving the quality of the received information sequence obtained at the receiving station when an error is detected at the wireless receiving station, the present invention has the above-mentioned received signal synthesis as described in claim 2. In the method, each radio receiving station transmits a signal before error correction and decoding to the receiving station when an error is detected in the error detection process, and the receiving station transmits the signal before error correction and decoding from all the radio receiving stations. When the signal of is received, the received signal can be synthesized according to the second algorithm, and then error correction and decoding can be performed to generate a received information sequence.
【0013】
Further, in order to solve the first problem, as described in claim 3, the present invention converts the received signal from a plurality of radio receiving stations that receive an error correction coded signal from the radio transmitting station. In a received signal synthesis method in which a signal based on a signal is transmitted to a receiving station and a reception information sequence is generated based on the signal received by the receiving station, each wireless receiving station receives the signal from the wireless transmitting station. Error correction / decoding and error detection processing are performed on the signal, and the first information according to the error detection result or the second information indicating a state in which the degree of error is larger than the first information is transmitted to the receiving station. When the receiving station receives the first information from any of the radio receiving stations, the receiving station transmits the first signal transmission command to the radio receiving station that is the source of the first information, and all of them. When the second information is received from the radio receiving station of the above, the second signal transmission command is transmitted to all the radio receiving stations, and further, each radio receiving station transmits the first signal from the receiving station. When the transmission command is received, the error correction / decoding result is transmitted to the receiving station, and when the second signal transmission command is received from the receiving station, the signal before the error correction / decoding is transmitted to the receiving station, and further. When the receiving station receives the error correction / decoding result from the wireless receiving station, the received error correction / decoding result is synthesized according to the first algorithm to generate a reception information series, and before the error correction / decoding is performed from all the receiving stations. When the signal of is received, the received signal is synthesized according to the second algorithm, and then error correction decoding is performed to generate a received information sequence.
【0014】
In such a received signal synthesis method, each radio receiving station reports the first information or the second information to the receiving station according to the error detection result. Then, when the receiving station receives the first information from any of the radio receiving stations, the receiving station transmits the first signal transmission command to the radio receiving station that is the source of the first information. The wireless receiving station that receives the first signal transmission instruction transmits the error correction / decoding result to the receiving station, and the receiving station that receives the error correction / decoding result synthesizes the error correction / decoding result according to the first algorithm. And generate a received information series.
【0015】
When the receiving station receives the second information from all the radio receiving stations, the receiving station transmits the second signal transmission command to all the radio receiving stations. The radio receiving station that receives this second signal transmission command transmits the signal before error correction decoding to the receiving station, and the receiving station that receives this signal synthesizes the received signal according to the second algorithm. Error correction decoding is performed to generate a received information series.
【0016】
The first information and the second information according to the error detection result are not particularly limited as long as they represent the degree of error (degree of reliability). For example, the first information may indicate that no error was detected (high reliability), and the second information may indicate that an error was detected (low reliability). ..
【0017】
From the viewpoint of providing a particularly effective method when turbo coding is used as the error correction coding, the present invention describes each radio receiving station in each of the received signal synthesis methods as described in claim 4. Then, when a signal obtained by performing tissue coding as error correction coding at a radio transmitting station is received from the radio transmitting station and error correction / decoding accompanied by iterative processing is performed, the processing is performed a predetermined number of times. Error detection processing is performed each time it is repeated, and depending on the result of the error detection processing, the first information or the second information indicating a state in which the degree of error is larger than the first information is transmitted to the receiving station, and the receiving station receives the error. Then, when the above-mentioned second information is received from all the radio receiving stations, all the radio receiving stations are instructed to continue the decoding, and the above-mentioned first information is received from any of the radio receiving stations. When the wireless receiving station, which is the source of the first information, is instructed to transmit the error correction decoding result, and the wireless receiving station is instructed to continue the decoding by the receiving station. , It is possible to continue the error correction / decoding accompanied by the iterative processing, and to transmit the error correction / decoding result to the receiving station when the receiving station instructs to transmit the error correction / decoding result.
【0018】
The coding algorithm in the above-mentioned tissue coding is not particularly limited, and for example, turbo coding can be used. Further, the error correction / decoding corresponds to the above-mentioned tissue coding, the process is repeated, and the error correction / decoding output is output every time the process is completed. When turbo coding is used as the tissue coding as described above, this error correction decoding is turbo decoding.
【0019】
From the viewpoint of preventing unnecessary repetition of error correction / decoding in each wireless receiving station, the present invention, as described in claim 5, in the received signal synthesis method, any one of the receiving stations. When the above-mentioned first information is received from the wireless receiving station of the above, the wireless receiving station other than the wireless receiving station which is the source of the first information is instructed to stop the error correction and decoding, and the wireless reception is performed. When the receiving station instructs the station to stop the error correction / decoding, the station may be configured to stop the error correction / decoding that has been repeatedly processed.
【0020】
Further, from the viewpoint of being able to generate a high-quality reception information sequence, the present invention, as described in claim 6, in each of the above received signal synthesis methods, each radio receiving station receives a signal from the radio transmitting station. When the received SIR is detected and the error correction / decoding result is transmitted to the receiving station, the detected receiving SIR is transmitted to the receiving station, and the receiving station determines based on the received received SIR. The error correction / decoding result obtained can be configured to be synthesized according to the first algorithm.
【0021】
Further, from the viewpoint that each radio receiving station can efficiently perform quantization when the signal before error correction decoding is quantized and transmitted to the receiving station, the present invention is described in claim 10 as described above. In the received signal synthesis method, each wireless receiving station uses the I-channel output signal and the Q-channel output signal of the demodulator when transmitting a signal obtained by quantizing the output of the demodulator as a signal before error correction decoding to the receiving station. A quantization table consisting of two-dimensional information can be created, and the output of the demodulator can be configured to be quantized by referring to this quantization table.
【0022】
Further, as described in claim 11, in the received signal synthesis method, each wireless receiving station transmits a signal obtained by quantizing the output of the demodulator as a signal before error correction decoding to the receiving station. Create a quantization table corresponding to the information that summarizes the I-channel output signal and Q-channel output signal of the demodulator that are continuous in time, and refer to this quantization table to quantize the output of the demodulator. Can be configured.
【0023】
Further, as described in claim 12, in the received signal synthesis method, each wireless receiving station transmits a signal obtained by quantizing the output of the demodulator as a signal before error correction decoding to the receiving station. A quantization table can be sequentially created using the average value and dispersion calculated from the demodulator output signal, and the demodulator output can be configured to be quantized with reference to this quantization table.
【0024】
Further, as described in claim 13, in the received signal synthesis method, when each wireless receiving station quantizes the signal before error correction and decoding and transmits it to the receiving station, the signal before error correction and decoding is transmitted. The number of quantization bits can be determined based on the received SIR estimated from, and the signal before error correction and decoding can be quantized at the determined number of bits.
【0025】
Further, as described in claim 14, in the above-mentioned received signal synthesis method, each radio receiving station applies a signal obtained by performing tissue coding as an error correction coding at the radio transmitting station to the radio transmitting station. When transmitting the signal obtained by quantizing the signal before performing error correction / decoding accompanied by iterative processing to the receiving station, the signal organization part and redundant part of the signal before performing error correction / decoding are subjected to. It is possible to create different quantization tables for each of them, and to refer to each of the quantization tables to quantize the above-mentioned organizational part and redundant part.
【0026】
Further, as described in claim 15, in the received signal synthesis method, when each radio receiving station quantizes the signal before error correction and decoding and transmits it to the receiving station, the receiving station and the radio concerned The number of quantization bits can be determined according to the state of the amount of information transmitted to and from the receiving station, and the signal before error correction and decoding can be quantized at the determined number of bits.
【0027】
Further, as described in claim 16, in the received signal synthesis method, each wireless receiving station performs communication required by the receiving station when the signal before error correction and decoding is quantized and transmitted to the receiving station. The number of quantization bits can be determined according to the quality, and the determined number of bits can be configured to quantize the signal before error correction and decoding.
【0028】
Further, in order to solve the first problem, as described in claim 17, the present invention converts the received signal from a plurality of radio receiving stations that receive an error correction coded signal from the radio transmitting station. In a received signal synthesis system in which a based signal is transmitted to a receiving station and a reception information sequence is generated based on the signal received by the receiving station, each radio receiving station receives from the radio transmitting station. When an error is not detected by the first error correction / decoding means that performs error correction / decoding on the signal, the error detection means that performs error detection processing on the received signal, and the error detection means. It has a first transmission control means for transmitting the error correction / decoding result obtained by the first error correction / decoding means to the receiving station, and the receiving station outputs the error correction / decoding result from any of the radio receiving stations. When it is received, it is configured to have a first synthesis means for generating a received information sequence by synthesizing the received error correction / decoding result according to the first algorithm.
【0029】
Further, as described in claim 19, the present invention transmits a signal based on the received signal from a plurality of radio receiving stations that receive the error correction encoded signal from the radio transmitting station to the receiving station. In the received signal synthesis system in which the received information sequence is generated based on the signal received by the receiving station, each wireless receiving station performs error correction decoding on the signal received from the wireless transmitting station. One error correction / decoding means, an error detection means that performs error detection processing on the received signal, and the first information according to the error detection result by the error detection means or an error from the first information. It has an error state information transmission control means for transmitting a second information indicating a large degree of state to the receiving station, and when the receiving station receives the first information from any of the radio receiving stations, the receiving station has the error state information transmission control means. When the first signal transmission command means for transmitting the first signal transmission command to the radio receiver station which is the source of the first information and the second information are received from all the radio receiver stations, It has a second signal transmission command means for transmitting a second signal transmission command to all radio receiving stations, and each radio receiving station further receives the first signal transmission command from the receiving station. Occasionally, when the first transmission control means for transmitting the error correction / decoding result to the receiving station and the second signal transmission command from the receiving station are received, the signal before error correction / decoding is transmitted to the receiving station. Having a second transmission control means, the receiving station further synthesizes the received error correction / decoding result according to the first algorithm when receiving the error correction / decoding result from the wireless receiving station, and receives the received information sequence. The first synthesis means for generating the above, the second synthesis means for synthesizing the received signal according to the second algorithm when the signal before error correction decoding is received from all the receiving stations, and the second synthesis means. It is configured to have a second error correction / decoding means for generating a received information sequence by performing error correction / decoding on the signal obtained by the synthesis means.
【0030】
In order to solve the second problem, the present invention is based on the received signal from a plurality of radio receiving stations that receive the error correction encoded signal from the radio transmitting station, as described in claim 22. A signal received from a radio transmission station in a radio reception station applied to a reception signal synthesis method in which a signal is transmitted to a reception station and a reception information sequence is generated based on the signal received by the reception station. When an error is not detected by the error correction and decoding means that performs error correction and decoding, the error detection means that performs error detection processing on the received signal, and the error detection processing by the error detection means. It has a first transmission control means for transmitting the error correction / decoding result to the receiving station, and when the receiving station receives the error correction / decoding result from the wireless transmitting station, the received error correction / decoding result is the first. It is configured so that a received information series can be generated by synthesizing according to one algorithm.
【0031】
Further, as described in claim 24, a plurality of radio receiving stations that receive error-corrected encoded signals from the radio transmitting station transmit a signal based on the received signal to the receiving station, and the receiving station receives the signal. An error correction decoding means for performing error correction decoding on a signal received from a radio transmission station in a radio reception station applied to a reception signal synthesis method in which a reception information sequence is generated based on the signal received in An error detection means that performs error detection processing on the received signal, and first information according to the error detection result obtained by the error detection means or a state in which the degree of error is larger than that of the first information. It has an error state information transmission control means for transmitting the second information to be represented to the receiving station, and when the receiving station receives the first information from the radio receiving station, the source of the first information is The first signal transmission command can be transmitted to the radio receiving station, and when the second information is received from all the radio receiving stations, the second signal transmission command is sent to all the radio receiving stations. The first transmission control means for enabling transmission of a signal transmission command and further transmitting the error correction / decoding result to the receiving station when the first signal transmission command is received from the receiving station, and the first transmission control means from the receiving station. It has a second transmission control means that transmits the signal before error correction decoding to the receiving station when the second signal transmission command is received, and further, the receiving station outputs the error correction decoding result from the radio receiving station. When received, the received error correction / decoding result is synthesized according to the first algorithm to generate a reception information series, and when the signal before error correction / decoding is received from all receiving stations, the received signal is used. It is configured so that the received information series can be generated by performing error correction decoding after synthesizing according to the second algorithm.
【0032】
Further, in order to solve the third problem, as described in claim 27, the present invention converts the received signal from a plurality of radio receiving stations that receive an error correction coded signal from the radio transmitting station. One of the radio receiving stations in the receiving station applied to the received signal synthesis method in which the based signal is transmitted to the receiving station and the received information sequence is generated based on the signal received by the receiving station. When an error correction / decoding result is received from, the first synthesis means for synthesizing the received error correction / decoding result according to the first algorithm to generate a received information sequence, and the above error correction / decoding from all wireless receiving stations. When the previous signal is received, the second synthesis means that synthesizes the received signal according to the second algorithm and the signal obtained by the second synthesis means are subjected to error correction and decoding and received. It is configured to have an error correction / decoding means for generating an information sequence.
【0033】
Further, as described in claim 28, a plurality of radio receiving stations that receive an error correction encoded signal from the radio transmitting station transmit a signal based on the received signal to the receiving station, and the receiving station receives the signal. In the receiving station applied to the received signal synthesis method in which the received information sequence is generated based on the signal received in, the first information according to the result of the error detection processing from any of the wireless receiving stations. Is received, the first signal transmission command means for transmitting the first signal transmission command to the radio receiver station which is the source of the first information, and the first signal transmission command means from all the radio receiver stations. A second signal transmission command means for transmitting a second signal transmission command to all radio receiving stations when the second information indicating a state in which the degree of error is larger than the information is received, and the first signal transmission means described above. When an error correction / decoding result is received from a radio receiving station in response to a signal transmission command, the first synthesis means for generating a received information sequence by synthesizing the received error correction / decoding result according to the first algorithm. When the signal before error correction and decoding is received from all the receiving stations in response to the second signal transmission command, the second synthesis means for synthesizing the received signal according to the second algorithm and the second It is configured to have an error correction / decoding means for generating a received information sequence by performing error correction / decoding on the signal obtained by the synthesis means of.
【0034】
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
【0035】
The basic configuration of the wireless transmission system according to the embodiment of the present invention is as shown in FIG. In this example, the wireless transmission system is realized as a mobile communication system capable of upstream site diversity.
【0036】
In FIG. 1, the mobile device (corresponding to a wireless transmitting station) 10 communicates with a plurality of base stations (corresponding to a wireless receiving station) 20 (1), 20 (2), and 20 (3) via wireless transmission lines, respectively. I do. Each base station 20 (1), 20 (2), 20 (3) is connected to a control station (corresponding to a receiving station, hereinafter referred to as RNC) 30 by wire. The RNC30 is connected to the network 100 and communicates with other communication units via the network 100.
【0037】
The transmitter of the mobile device 10 is configured as shown in FIG. 2, for example.
【0038】
In FIG. 2, the transmitter of the mobile device 10 includes a CRC coding circuit 11, a turbo coding circuit 12, a modulator 13, and a transmitter 14. The CRC coding circuit 11 applies CRC coding to a transmission information sequence representing information to be transmitted. The turbo coding circuit 12 applies turbo coding as error correction coding to the CRC coded information sequence. The information sequence obtained by the CRC coding and turbo coding as described above is modulated by the modulator 13 and transmitted from the transmitter 14.
【0039】
The receiver of each base station 20 (referred to by reference numeral 20 when generically referring to a base station) is configured as shown in FIG. 3, for example.
【0040】
In FIG. 3, the receiving unit of the base station 20 includes a receiver 21, a demodulator 22, a turbo decoding circuit 23, a CRC error detection circuit 24, and a switch circuit 25. The signal from the mobile device 10 described above is received by the receiver 21 and further demodulated by the demodulator 22. The turbo decoding circuit 23 turbo-decodes (error-correcting and decoding) the demodulated output from the demodulator 22 according to an algorithm corresponding to the above-mentioned turbo coding (error-correcting coding). The CRC error detection circuit 24 performs CRC error detection of the information series obtained by turbo decoding according to the algorithm corresponding to the CRC coding. The output of the CRC error detection circuit 24 is supplied to the RNC 30 as an error detection result.
【0041】
Further, the switch circuit 25 selects either a demodulation output from the demodulator 22 or an error correction / decoding output from the turbo decoding circuit 23 according to the error detection result from the CRC error detection circuit 24. When the error detection result is "no error", the switch circuit 25 selects the error correction decoding output from the turbo decoding circuit 23, and when the error detection result is "error", the switch circuit 25 demodulates. Select the demodulation output from device 22. Then, the signal selected by the switch circuit 25 is supplied to the RNC 30.
【0042】
The RNC30 is configured, for example, as shown in FIG.
【0043】
In FIG. 4, the RNC 30 includes a selective synthesis circuit 31, a maximum ratio synthesis circuit 32, an error correction / decoding circuit 33, a first switch circuit 34, a second switch circuit 35, and an error check circuit 36. The signal from each base station 20 is supplied to either the selective synthesis circuit 31 or the maximum ratio synthesis circuit 32 via the first switch circuit 34. The error check circuit 36 checks the presence or absence of a decoding error in each base station 20 based on the error detection result supplied from each base station 20.
【0044】
The first switch circuit 34 has a switching unit corresponding to each base station, and each switching unit has a port A for selecting the selective synthesis circuit 31 and a port B for selecting the maximum ratio synthesis circuit 32. doing. The switching unit corresponding to the base station whose check result in the error check circuit 36 is "no error" selects port A, and the signal (error correction / decoding output) from the base station is supplied to the selection synthesis circuit 31. Will be. On the other hand, the switching unit corresponding to the base station whose check result in the error check circuit 36 is "error" selects port B, and the signal (demodulation output) from the base station is supplied to the maximum ratio synthesis circuit 32. Become so.
【0045】
The error correction / decoding circuit 33 performs error correction / decoding on the composite signal from the maximum ratio synthesis circuit 32 according to the same algorithm as the turbo decoding described above. Further, the second switch circuit 35 receives either the output from the selection synthesis circuit 31 (port A) or the output from the error correction / decoding circuit 33 (port B) based on the check result in the error check circuit 36. Select as an information series (received signal). Specifically, when a check result of "no error" is obtained for at least one base station 20, the second switch circuit 35 receives the output (port A) from the selective synthesis circuit 31 in the information sequence. Select as. On the other hand, when the check result of "error" is obtained for all the base stations, the second switch circuit 35 selects the output (port B) from the error correction / decoding circuit 33 as the reception information sequence.
【0046】
The received information series generated by the RNC30 as described above is transmitted to the communication partner terminal via the network 100.
【0047】
In the wireless transmission system configured as described above, site diversity reception is performed on the signal transmitted from the mobile device 10 as shown in FIG. 5, for example. In FIG. 5, each base station 20 (1), 20 (2), 20 (3) is represented as a wireless receiving station, and RNC30 is represented as a receiving station (hereinafter, FIG. 6, FIG. 9, FIG. 10, Fig. 11, Fig. 12, and Fig. 13).
【0048】
If no error is detected by the CRC error detection circuit 24 in at least one of the plurality of base stations 20 (1), 20 (2), 20 (3) that receives the signal transmitted from the mobile device 10. As shown in FIG. 5A, an error correction decoding output from the turbo decoding circuit 23 is supplied to the RNC 30 from a base station (for example, 20 (1), 20 (2)) in which the error is not detected. On the other hand, the demodulated output from the demodulator 22 is supplied to the RNC 30 from the base station (for example, 20 (3)) in which the error is detected.
【0049】
Then, in the RNC 30, the provided error correction / decoding output is synthesized by the selective synthesis circuit 31, and the composite signal in the selective synthesis circuit 31 is selected as the reception information sequence.
【0050】
On the other hand, when an error is detected by the CRC error detection circuit 24 in all the base stations 20 (1), 20 (2), and 20 (3) that receive the signal transmitted from the mobile device 10. As shown in FIG. 5 (b), the demodulated output obtained by the demodulator 22 is supplied to the RNC 30 from all the base stations 20 (1), 20 (2), and 20 (3). Then, in the RNC30, the demodulated outputs provided by all the base stations 20 (1), 20 (2), and 20 (3) are combined in the maximum ratio by the maximum ratio synthesis circuit 32, and the combined signal obtained as a result is obtained. Error correction and decoding is performed by error correction and decoding 33. This error correction / decoding output is output from RNC30 as a received information series.
【0051】
According to the above-mentioned site diversity reception, the demodulated output of the demodulator 22 having a large amount of information is obtained from the base station in which the signal from the mobile device 10 is normally decoded and the error is not detected among the plurality of base stations. It is not necessary to transmit the error correction / decoding output to the RNC30, and the error correction / decoding output with a relatively small amount of information may be transmitted to the RNC30. Therefore, the amount of transmission information between each base station 20 (1), 20 (2), 20 (3) serving as a wireless receiving station and the RNC 30 serving as a receiving station can be reduced.
【0052】
Further, when an error is not detected in at least one base station, the error correction / decoding output from the base station without the error is selectively synthesized by the RNC30, so that the RNC30 generates a relatively high quality reception information sequence. be able to. On the other hand, even if an error is detected in all the base stations, the demodulated output (signal before error correction and decoding) from those base stations is combined at the maximum ratio by RNC30 and then error-corrected and decoded. In this case as well, it is possible to generate a relatively high quality received information sequence.
【0053】
In the wireless transmission system as described above, for example, it is possible to perform site diversity reception as shown in FIG.
【0054】
In this example, as shown in FIG. 6A, an error from the turbo decoding circuit 23 is obtained from the base station in which the signal from the mobile device 10 is normally received and the error is not detected among the plurality of base stations. The correction / decoding output is transmitted to the RNC30, and the error correction / decoding output is selectively synthesized in the RNC30. On the other hand, no signal is transmitted to the RNC 30 from the base station where the signal from the mobile device 10 is not normally received and the error is detected. Therefore, if an error is detected in all the base stations 20 (1), 20 (2), and 20 (3), the RNC30 will display what from each base station, as shown in Fig. 6 (b). No signal is received. In this case, in RNC30, the information part that is not transmitted is processed as a transmission error.
【0055】
According to such site diversity reception, if an error is detected in each base station 20 (1), 20 (2), 20 (3) without normal reception, each base station 20 (1), 20 Since no signal is transmitted from (2) and 20 (3) to RNC30, the amount of information transmitted between each base station 20 (1), 20 (2), 20 (3) and RNC30 can be reduced. .. Further, by adjusting the number and installation positions of the base stations that simultaneously receive the signal of the mobile device 10, it is possible to reduce the situation where all the base stations cannot normally receive the signal from the mobile device 10. .. Therefore, it is possible to reduce the amount of transmitted information between the base station and the RNC30 while maintaining the quality of the received information sequence in the RNC30 relatively high.
【0056】
Each base station 20 (1), 20 (2), 20 (3) and RNC30 in a wireless transmission system as shown in FIG. 1 can also be configured as shown in FIGS. 7 and 8.
【0057】
In FIG. 7, which shows the configuration of each base station, the base station 20 has a receiver 21, a demodulator 22, a turbo decoding circuit 23, and a CRC error detection circuit 24, as in the above-described example. The base station 20 further has a switch circuit 26 that is switched by a transmission command signal from the RNC 30 described later. When the transmission command signal of the error correction decoding output is input, the switch circuit 26 selects the error correction decoding output (port A) from the turbo decoding circuit 23, and when the transmission command signal of the demodulation output is input, the switch circuit 26 is input from the demodulator 22. Select the demodulated output (port B) of. Then, the signal selected by the switch circuit 26 is supplied to the RNC 30 together with the error detection signal from the CRC error detection circuit 24.
【0058】
In FIG. 8 showing the configuration of the RCN30, the RNC30 has a selective synthesis circuit 31, a maximum ratio synthesis circuit 32, an error correction / decoding circuit 33, a first switch circuit 34, and a second switch circuit 35, as in the above-mentioned example. And has an error checking circuit 36. The RNC30 further includes a first transmission instruction generation circuit 37 that generates a transmission instruction for an error correction / decoding output, a second transmission instruction generation circuit 38 that generates a transmission instruction for a demodulation output, and a switch circuit 39. .. This switch circuit 39 includes a transmission command (port A) for error correction / decoding output from the first transmission command generation circuit 37 and a second transmission command generation circuit 38 based on the error detection check result from the error check circuit 36. Select one of the transmission instructions (port B) for the demodulated output from.
【0059】
Specifically, when the check result of "no error" is obtained in the error check circuit 36, the switch circuit 39 selects the transmission command of the error correction / decoding output from the first transmission command generation circuit 37, and then selects the transmission command. On the other hand, when the check result of "error" is obtained in the error check circuit 36, the switch circuit 39 selects the transmission command of the demodulated output from the second transmission command generation circuit 38. As described above, the transmission instruction selected by the switch circuit 39 is supplied to the switch circuit 26 (see FIG. 7) of the base station to be checked for errors.
【0060】
In the wireless transmission system having each of the base stations 20 (1), 20 (2), 20 (3) and RNC30 configured in this way, diversity reception is performed, for example, as shown in FIGS. 9 and 10.
【0061】
FIG. 9 shows a case where at least one base station normally receives a signal from the mobile device 10 and error detection is not performed. Further, FIG. 10 shows a case where all the base stations cannot normally receive the signal from the mobile device 10 and error detection is performed.
【0062】
In the case shown in FIG. 9, the base stations (20 (1), 20 (2)) that normally receive the signal from the mobile device 10 and do not detect an error in the CRC error detection circuit 24 have an error detection result of "high". The base station (20 (3)), which transmits only the "reliability" signal to the RNC30 and detects an error in the CRC error detection circuit 24 without normally receiving the signal from the mobile device 10, has an error detection result. Only "low reliability" signals are sent to the RNC30 (see Figure 9 (a)). The RNC30, which has received the "high reliability" signal and the "low reliability" signal from each base station in this way, transmits the first transmission to the base station that has sent the "high reliability" signal. Select the instruction generation circuit 37 (see Fig. 8) to transmit the transmission command for error correction and decoding output, and do not return a response to the base station that sent the "low reliability" signal (Fig. 9 (b)). reference).
【0063】
Then, at the base station that received the transmission command of the error correction / decoding output, the switch circuit 26 selects port A based on this transmission command (see FIG. 7), and as a result, the error correction / decoding from the turbo decoding circuit 23 The output is transmitted from the base station to the RNC30. On the other hand, the base station that transmits the "low reliability" signal to the RNC30 as an error detection result does not return the response from the RNC30 and does not transmit any signal to the RNC30 (see FIG. 9 (c)).
【0064】
Upon receiving the error correction / decoding output transmitted from each base station for which the error detection result of "high reliability" is obtained as described above, the RNC30 selects and synthesizes the error correction / decoding output to obtain the received information sequence. Generate.
【0065】
Further, in the case shown in FIG. 10, all the base stations 20 (1), 20 (2), and 20 (3) cannot normally receive the signal from the mobile device 10, and an error occurs in the CRC error detection circuit 24. When detected, each base station 20 (1), 20 (2), 20 (3) transmits only a "low reliability" signal to the RNC30 as an error detection result (see FIG. 10 (a)). Upon receiving the "low reliability" signal from all the base stations, the RNC30 selects the above-mentioned second transmission command generation circuit 37 (see FIG. 8) for all the base stations and issues a transmission command for the demodulated output. Send (see Figure 10 (b)).
【0066】
Then, at each base station that receives the transmission command of this demodulation output, the switch circuit 26 selects port B based on this transmission command (see FIG. 7), and as a result, the demodulation output from the demodulator 22 is output to each base. It is transmitted from the station to RNC30. Upon receiving the demodulated output transmitted from all the base stations for which the error detection result of "low reliability" is obtained in this way, the RNC30 synthesizes the demodulated signals at the maximum ratio, and then performs the error correction and decoding process. Is executed to generate a received information series.
【0067】
According to the above-mentioned site diversity reception, the information about the error detection result (high reliability is first obtained from the base station that can normally receive the signal from the mobile device 10 and the base station that cannot normally receive the signal. "Or" unreliable ") is only transmitted to the RNC30. When the RNC30 receives a "high reliability" signal from at least one base station, it transmits an error correction / decoding output transmission command to the base station that is the source of the signal. On the other hand, the RNC30 transmits a transmission command for demodulation output to all base stations only when a "low reliability" signal is received from all base stations. Then, each base station transmits the information representing such an error detection result to the RNC30, and when it receives the transmission command of the error correction / decoding output, transmits the error correction / decoding output to the RNC30 in accordance with the transmission instruction. When a transmission command for the demodulated output is received after transmitting information indicating an error detection result to the RNC30, the demodulated output is transmitted to the RNC30 according to the transmission command.
【0068】
Therefore, the case where a demodulated output with a relatively large amount of information is transmitted between each base station 20 (1), 20 (2), 20 (3) and RNC30 is reduced as much as possible, and the amount of information transmission should be reduced. Is possible.
【0069】
By using CRC coding as an error detection method for the received signal from the mobile device 10, highly accurate error detection is possible. However, the probability of false positives is not zero. In consideration of such a situation, for example, as shown in FIG. 11, it is preferable to transmit the received SIR in the communication with the mobile device 10 to the RNC 30 together with the error detection result at each base station. In this case, the RNC30 that has received this received SIR together with the error detection result creates a received information sequence by performing selective synthesis on the error correction / decoding output from the base station that maximizes the received SIR, for example.
【0070】
As described above, the base station having the maximum received SIR can receive the signal from the mobile device 10 more reliably (the probability of false detection in error detection is low). Therefore, even if an error detection error occurs in a base station having a low reception SIR, it is possible to prevent the quality of the reception information sequence obtained by the RNC 30 from deteriorating.
【0071】
As described above, when turbo coding is used as the error correction coding in the mobile device 10 and turbo decoding is used as the error correction decoding in each base station 20 (1), 20 (2), 20 (3). , The turbo decoding process in each of the base stations 20 (1), 20 (2), and 20 (3) is iteratively processed. In this case, each base station may execute CRC error detection on the error correction / decoding output every time the iterative processing is performed a predetermined number of times, and report the error detection result to RNC30. Then, the RNC30 is, for example, as shown in FIG. 12 (a), in a situation where all the error detection results reported from each base station are low reliability, as shown in FIG. 12 (b). Instruct each base station 20 (1), 20 (2), 20 (3) to "continue decoding". Each of the base stations 20 (1), 20 (2), and 20 (3) that has received the instruction of "continue decoding" is continuously and repeatedly executed by the turbo decoding circuit 23.
【0072】
Then, in the process of executing CRC error detection for the error correction decoding output every time the iterative processing in the turbo decoding circuit 23 reaches a predetermined number of times, for example, as shown in FIG. 13A, at least 1 When the error detection result from one base station (for example, 20 (1)) becomes "high reliability", the RNC30 transmits the error detection result having "high reliability" as shown in FIG. 13 (b). An error correction decoding output transmission command is transmitted to the base station (20 (1)), and a decoding stop command is transmitted to the other base stations (20 (2), 20 (3)). The base station that has received the transmission command of the error correction / decoding output transmits the error correction / decoding output from the turbo decoding circuit 23 to the RNC 30 as shown in FIG. 13 (c). Then, the RNC30 that has received this error correction / decoding output performs selective synthesis on the received error correction / decoding output to generate a received information series. Further, the base station that has received the decoding stop command stops the iterative processing in the turbo decoding circuit 23 regardless of the result of error detection for the error correction decoding output at that time.
【0073】
According to such processing, it is possible to reduce the number of repetitions of the decoding process to be executed until an appropriate error correction / decoding output is obtained at each base station, and an appropriate error correction / decoding output can be obtained at each base station. It is possible to shorten the processing time for obtaining.
【0074】
In the wireless transmission system, the mobile device 10 and the base stations 20 (1), 20 (2), and 20 (3) can be configured as shown in FIGS. 14 and 15.
【0075】
In FIG. 14, which shows the configuration of the mobile device 10, the transmitter of the mobile device 10 has a convolutional coding circuit 121 instead of the turbo coding circuit 12. Therefore, after CRC coding is applied to the transmission information series, convolutional coding is performed as error correction coding. Then, modulation and transmission are performed on the signal sequence obtained by the convolutional coding circuit 121.
【0076】
Further, in FIG. 15 showing the configuration of each base station, the receiving unit of each base station 20 has a Viterbi decoding circuit 231 corresponding to the convolutional coding circuit 121 of the mobile device 10 instead of the turbo decoding circuit 23. doing. Therefore, Viterbi decoding is performed after reception and demodulation, and CRC error detection is executed for the Viterbi decoding output. If no error is detected as a result of the CRC error detection, the Viterbi decoding result is transmitted to the RNC30 as an error correction decoding output.
【0077】
Further, the receiving unit of each base station 20 has a quantization circuit 27 for quantizing the demodulated output from the demodulator 22 and a run-length compression circuit 28 for run-length compression of the quantization output output from the quantization circuit 27. doing. Therefore, when an error is detected as a result of the CRC error detection, the demodulated output (input signal to the Viterbi decoding circuit 231) is quantized, run-length encoded, and then transmitted to the RNC30.
【0078】
The quantization circuit 27 in each base station 20 can be configured as shown in FIG. 16, for example.
【0079】
In FIG. 16, this quantization circuit 27 has a quantizer 271, a correlation detector 272, and a quantization table creation circuit 273. The demodulator 22 that demodulates the received signal obtained by the receiver 21 has an I channel and a Q channel, and the signals of the I channel and the Q channel obtained by the demodulation are input to the correlation detector 272. ing. Correlation detector 272 measures the correlation between I-channel and Q-channel signals. Then, the quantization table creation circuit 273 creates a quantization table based on the measurement result of the correlation detector 272.
【0080】
When the correlation between the I channel and Q channel signals that are the outputs of the demodulator 22 is high, the number of quantization bits of either channel can be reduced, so a highly efficient quantization table is created. can do. With reference to the quantization table created in this way, the quantizer 271 quantizes the demodulated output from the demodulator 22.
【0081】
The quantization circuit 27 can also be configured as shown in FIG.
【0082】
In this example, as in the above example, the quantization circuit 27 has a quantizer 271, a correlation detector 271, and a quantization table creation circuit 273. In this quantization circuit 27, the I channel and Q channel signals from the demodulator 22 are directly input to the correlation detector 272, and are also input to the correlation detector 272 via the delay elements 274 and 275, respectively. ..
【0083】
In such a quantization circuit 27, the correlation detector 272 measures the correlation of each signal based on the signals of the I channel and the Q channel and the signals in which they are delayed. Then, for signals other than signals of a certain channel (for example, I channel) (for example, Q channel and delayed signal), the number of quantization bits can be reduced, so that a highly efficient quantization table should be created. Can be done. Then, the quantizer 271 quantizes the demodulated output from the demodulator 22 with reference to the quantization table created in this way.
【0084】
Further, the demodulator 22 and the quantization circuit 27 can be configured as shown in FIG. 18, for example. This example is applied to a W-CDMA (Wide-Band Code Division Multiple Access) wireless transmission system.
【0085】
In FIG. 18, the demodulator 22 includes a RAKE synthesizer 221, an average value calculation unit 222, a distribution calculation unit 223, a reception SIR detection unit 224, and a TPC command generation unit 225. In this way, in the W-CDMA system, after the spread received signal is despread and rake-combined (RAKE-synthesized), the output from the RAKE synthesizer 221 is used to generate the power control (TPC) command of the mobile device. The mean value and the variance of the signal are sequentially calculated by the mean value calculation unit 222 and the variance calculation unit 223, respectively. Then, the quantization table creation circuit 273 updates the quantization table sequentially using the mean value and the variance. By quantizing the demodulated output (lake composite output) with reference to such a quantization table, efficient quantization of the demodulated output becomes possible.
【0086】
Further, the quantization circuit 27 can also be configured as shown in FIG.
【0087】
This example is applied to a W-CDMA wireless transmission system as in the above example.
【0088】
In FIG. 19, the demodulator 22 has a RAKE synthesizer 221, an average value calculation unit 222, a distribution calculation unit 223, a reception SIR detection unit 224, and a TPC command generation unit 225, as in the example shown in FIG. .. Further, the quantization circuit 27 has a quantizer 271 and a quantization bit number determination circuit 276. When the received SIR detected by the receiving SIR detection unit 224 is high, even if the number of quantization bits is reduced, the communication quality is unlikely to deteriorate. Therefore, the quantization bit number determination circuit 276 is calculated for issuing the TPC command. The number of quantization bits is adaptively changed according to the received SIR. For example, when the received SIR is large, the number of quantization bits is reduced, and when the received SIR is small, the number of quantization bits is increased. Then, the demodulation output (lake synthesis output) is quantized by the quantizer 271 with the number of bits determined by the quantization bit number determination circuit 276. By such a quantization method, it is possible to efficiently quantize the demodulated output without deteriorating the communication quality.
【0089】
The transmitting unit of the mobile device 10 and the receiving unit of each base station 20 can be configured as shown in FIGS. 20 and 21, for example.
【0090】
In FIG. 20, which shows the transmitter of the mobile device 10, the transmitter of the mobile device 10 includes a turbo encoder 12, a parallel series converter 15, a modulator 13, and a transmitter 14. The organization part and the redundant part of the turbo-encoded signal output from the turbo encoder 12 are multiplexed by the parallel series converter 15. The multiplexed signal is modulated by the modulator 13, and the modulated signal is transmitted from the transmitter 14.
【0091】
In FIG. 21 showing the receiving unit of each base station, the receiving unit of each base station 20 has a receiver 21 and a demodulator 22, and the signal multiplexed by the transmitting unit of the mobile device 10 is used as an organization unit. It has a series-parallel converter 277 that divides into redundant parts. The receiving unit of the base station 20 further uses the quantization table created by the first quantization table creation circuit 273a and the first quantization table creation circuit 273a that create a quantization table for the organization portion. A second quantization table creation circuit 273b that has a first quantization device 271a that quantizes the tissue part by reference and creates a quantization table for the redundant part, and this second quantization table creation. It has a second quantizer 271b that quantizes the redundant part with reference to the quantization table created in circuit 273b. Then, the quantization outputs of the organization part and the redundant part from the first and second quantizers 271a and 271b are multiplexed by the parallel series converter 278, and the received information sequence is generated.
【0092】
In a wireless transmission system having a mobile device 10 and each base station 20 having such a configuration, a quantization table for an organizational part and a redundant part is individually created. In turbo decoding, the signal of the tissue part is more important than the signal of the redundant part. Therefore, by creating a quantization table so that the quantization noise of the tissue part is smaller than that of the redundant part, the efficiency is higher. Can be converted.
【0093】
The receiving unit of each base station 20 can be configured as shown in FIG. 22, for example.
【0094】
In FIG. 22, the receiving unit of the base station 20 includes a receiver 21, a demodulator 22, a quantization device 271, and a quantization bit number determination circuit 276. The quantization bit number determination circuit 276 adaptively determines the number of quantization bits based on either or both of the required quality information from the RNC30, which is a control station higher than each base station, and the line capacitance information between the base station and the RNC. To decide. Then, the quantizer 271 quantizes the demodulated output with the number of quantization bits determined as described above.
【0095】
With the configuration of each base station as described above, it is possible to communicate with the quality required by the user and to communicate with higher quality depending on the situation of the amount of transmission information between the base station and the RNC30.
【0096】
In each of the above examples, wireless transmission using a mobile device 10 as a wireless transmitting station, base stations 20 (1), 20 (2), 20 (3) as a plurality of wireless receiving stations, and a control station RNC30 as a receiving station, respectively. Although the system has been described, the present invention is not limited to such a configuration, and can be applied to wireless transmission systems other than mobile communication systems. Further, the wireless receiving station (base station) and the receiving station (RNC) may be connected by a wired transmission line or may be connected by a wireless transmission line.
【0097】
[Effect of the invention]
As described above, according to the received signal synthesis method and system according to the present invention according to claims 1 to 21, when error detection is not performed, an error correction / decoding result having a relatively small amount of information is wirelessly received. It is transmitted from the station to the receiving station, and the error correction / decoding result is synthesized at the receiving station to generate a receiving information series. Therefore, the receiving station while reducing the amount of transmission information between each wireless receiving station and the receiving station as much as possible. It becomes possible to obtain a higher quality received signal.
【0098】
Further, according to the invention of the present application according to claims 22 to 26, it is possible to provide a wireless receiving station that can be applied to the received signal synthesis method as described above.
【0099】
Further, according to the invention of the present application according to claims 27 and 30, it is possible to provide a receiving station that can be applied to the received signal synthesis method as described above.
[Simple explanation of drawings]
[Figure 1]
It is a block diagram which shows the structural example of the wireless transmission system which concerns on one Embodiment of this invention.
[Figure 2]
It is a block diagram which shows the structural example of the transmission part of a mobile device.
[Fig. 3]
It is a block diagram which shows the structural example of the receiving part of each base station.
[Fig. 4]
It is a block diagram which shows the structural example of a control station (RNC).
[Fig. 5]
It is a figure explaining the first example of diversity reception.
[Fig. 6]
It is a figure which shows the 2nd example of diversity reception.
[Fig. 7]
It is a block diagram which shows the other configuration example of the receiving part of each base station.
[Fig. 8]
It is a block diagram which shows the other configuration example of a control station (RNC).
[Fig. 9]
It is a figure which shows the 3rd example (the 1) of diversity reception.
[Fig. 10]
It is a figure which shows the 3rd example (the 2) of diversity reception.
[Fig. 11]
It is a figure which shows the 4th example of diversity reception.
[Fig. 12]
It is a figure which shows the 5th example (the 1) of diversity reception.
[Fig. 13]
It is a figure which shows the 5th example (the 2) of diversity reception.
[Fig. 14]
It is a block diagram which shows the other configuration example of the transmission part of a mobile device.
[Fig. 15]
It is a block diagram which shows the other configuration example of the receiving part of each base station.
[Fig. 16]
It is a block diagram which shows the structural example of a quantization circuit.
[Fig. 17]
It is a block diagram which shows the other structural example of a quantization circuit.
[Fig. 18]
It is a block diagram which shows the structural example of a demodulator and a quantization circuit.
[Fig. 19]
It is a block diagram which shows the other structural example of a demodulator and a quantization circuit.
[Fig. 20]
It is a block diagram which shows the other configuration example of the transmission part of a mobile device.
[Fig. 21]
It is a block diagram which shows the other configuration example of the receiving part of each base station.
[Fig. 22]
It is a block diagram which shows the other configuration example of the receiving part of each base station.
[Fig. 23]
It is a block diagram which shows the basic configuration example of the wireless transmission system which performs site diversity reception.
[Explanation of symbols]
10 Mobile device (wireless transmitter) 11 CRC error coding circuit 12 turbo coding circuit 13 Modulator 14 transmitter 20, 20 (1), 20 (2), 20 (3) Base station (wireless receiving station) 21 receiver 22 Demodulator 23 Turbo decoding circuit 24 CRC error detection circuit 25 switch circuit 30 Control station RNC (Receiving station) 31 Selective synthesis circuit 31 Maximum ratio synthesis circuit 33 Error correction decoding circuit 34 First switch circuit 35 Second switch circuit 36 Error check circuit 37 First transmission instruction generation circuit 38 Second transmission instruction generation circuit 39 Switch circuit
24 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 15 Sheet 16 Sheet 17 Sheet 18 Sheet 19 Sheet 20 Sheet 21 Sheet 22 Sheet 23 Sheet 24
Every citation, both ways
| Document | Relation | Office | Cited during |
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| JP2008153951A | Cited by | Japan | Examiner |
| WO0245272A1 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| US8358679B2 | Cited by | United States of America | Applicant |
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| JP2013519251A | Cited by | Japan | Search report |
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10 members in 5 offices
Priority claims2
| Document | Office | Kind | Date |
|---|---|---|---|
| 2000046625 | Japan | A | |
| JP20000046625 | – | – | – |
Members10
| Document | Office | Kind | |
|---|---|---|---|
| CN1310555A | China | A | |
| EP1128587A2 | European Patent Office (EPO) | A2 | |
| JP2001237753AThis record | Japan | A | |
| US2001020285A1 | United States of America | A1 | |
| EP1128587A3 | European Patent Office (EPO) | A3 | |
| US6915465B2 | United States of America | B2 | |
| CN1276669C | China | C | |
| JP3852736B2 | Japan | B2 | |
| EP1128587B1 | European Patent Office (EPO) | B1 | |
| DE60134355D1 | Germany | D1 |
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Numbers
- Publication
- 2001-237753
- Publication, DOCDB
- 2001237753
- Publication, EPODOC
- JP2001237753
- Application
- 46625
- Application, DOCDB
- 2000046625
- Application, EPODOC
- JP20000046625
Titles2
- Japanese
- 受信信号合成方法、システム、無線受信局及び受信局
- English
- [Title of Invention] Received signal synthesis method, system, wireless receiving station and receiving station
Classification
- CPC, 4
- H04B7/022
- H04B7/0871
- H04L1/0066
- H04L1/06
- IPC, 7
- H03M13 23
- H03M13 29
- H04B7 08
- H04B7 26
- H04L1 00
- H04L1 06
- H03M13 09