Adaptive reception diversity device and adaptive transmission diversity device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an adaptive diversity device for digital communication.

【0002】

[Conventional technology]

The conventional adaptive diversity device will be described with reference to FIGS. 5 and 6. FIG. 5 is a block diagram of the conventional adaptive diversity device, and FIG. 6 is a reception (transmission) directivity pattern diagram. In FIG. 5, the complex signals received by the receiving antennas 501, 502, 503, 504 at time t, A / D converted, and orthogonally detected are S, respectively.₁(t), S₂(t), S₃(t), S₄Let it be (t). In these, the reception directivity controller 509 has a complex number weight W.₁(t), W₂(t), W₃(t), W₄Multiply (t) by the multipliers 505, 506, 507 and 508 and add by the adder 512. At this time, assuming that the output of the reception directivity controller 509 is S (t), [Number 1]

<img file="JPH10285104A_D0001.tif" />Can be expressed as.

【0003】

In this way, by multiplying the received signals of a plurality of antennas by an appropriate complex number and synthesizing them, the directivity of the antenna group as a whole can be obtained on a plane as shown in FIG. For example, when the desired signal arrives from the direction of 601 in FIG. 6 and the interference signal arrives from the direction of 602, the reception directivity controller 509 controls the directivity as shown in 603 of FIG. Therefore, it is possible to receive a desired signal strongly and an interference signal weakly, so that the reception performance can be improved.

【0004】

The determination device 511 outputs a result D (t) as a result of hard determination of the combined signal S (t). The error detector 510 outputs the difference S (t) -D (t) between the combined signal S (t) and the hardness determination result D (t). The reception directivity controller 509 sets the output of the error detector and S.₁(t), S₂(t), S₃(t), S₄Based on (t), its output complex weight W₁(t), W₂(t), W₃(t), W₄Update (t).

【0005】

For example, the received signal vector is Sig (t) = (S).₁(t), S₂(t), S₃(t), S₄(t))^TAnd the output of the reception directivity controller is W (t) = (W)₁(t), W₂(t), W₃(t), W₄(t))^TWhen written as [Number 2]

<img file="JPH10285104A_D0002.tif" />Can be expressed as. μ is the step coefficient.

【0006】

[Problems to be Solved by the Invention]

In the above-mentioned conventional adaptive diversity device, the formation of the directional pattern can be correctly followed when the moving speed on the transmitting side is low by sequentially updating the weight to be multiplied by the input signal from the antenna.

【0007】

However, when the moving speed on the transmitting side is high, the complex number weights do not converge, so that the receiving directivity control device cannot follow the moving speed, and there is a problem that a correct directivity pattern cannot be formed.

【0008】

The present invention improves transmission / reception performance by forming a correct directional pattern by following the reception directional control device / transmission directional control device even when the moving speed of the transmitting side or the receiving side is fast. It is an object of the present invention to provide an adaptive diversity device.

【0009】

[Means for solving problems]

In order to solve the above problems, the present invention has made it possible to forcibly rotate the directional pattern to form a correct directional pattern by estimating the moving direction of the communication partner side.

【0010】

Specifically, the invention according to claim 1 of the present invention estimates a reception directional control means for giving a first reception directional to a reception signal from an antenna by a first control signal, and a moving direction on the transmitting side. A directional correction control means for giving the received signal a second reception directivity by a second control signal based on the output of the moving direction estimating means, and the first control signal and the second control signal for the received signal. The configuration includes a received signal processing system having a multiplying means for multiplying the control signal.

【0011】

With this configuration, the reception directivity extracted and generated from the reception signal can be corrected at high speed according to the movement of the transmission side, so that the reception performance can be significantly improved. [0012]

Further, the invention according to claim 2 is configured such that the directivity correction control means outputs a second control signal for rotationally controlling the first reception directivity based on the output of the moving direction estimation means.

【0013】

As a result, the phase of the first reception directivity pattern can be rotated, and the reception directivity can be corrected easily and reliably.

【0014】

Further, the invention according to claim 3 is configured such that the directivity correction control means generates a second control signal so as to cancel the phase change amount obtained from the displacement in the arrival direction of the received wave.

【0015】

With this configuration, the direction of arrival of the received wave can be estimated from the received signal and the relative angle with the communication partner can be calculated, so that the directivity correction can be realized at low cost.

【0016】

Further, the invention according to claim 4 is provided independently of the reception directivity control means and the directivity correction means, and the received signal, the first control signal, and the second control signal are multiplied by a single multiplication means. Configured to multiply.

【0017】

This simplifies the circuit and facilitates the incorporation and implementation of the directivity correction means into the existing circuit.

【0018】

Further, when the present invention is applied to an adaptive reception diversity device, specifically, as in the invention of claim 5, a plurality of antennas, a moving direction estimating means for estimating the moving direction of the transmitting side, and an antenna. The reception directivity control means for giving the reception directivity to the reception signal from the antenna, the addition means for synthesizing a plurality of inputs from the antenna, and the directivity for rotating and controlling the reception directivity from the output of the movement direction estimation means. It includes a correction control means, a determination means for rigidly determining the output of the addition means, and an error detection means for detecting an error between the determination means and the output of the addition means and feeding it back to the reception directivity control means. It may be configured to be.

【0019】

Further, according to the invention of claim 6, the directivity correction control means obtains a relative phase change amount due to the movement of the transmitting side in each of a plurality of arranged antennas based on the output of the movement direction estimation means, and each phase. It is configured to generate a second control signal according to the amount of change.

【0020】

Further, according to the invention of claim 11, the directivity correction control means obtains the relative phase change amount due to the movement of the receiving side in each of the plurality of arranged antennas based on the output of the movement direction estimation means, and each phase. It is configured to generate a second control signal according to the amount of change.

【0021】

With these configurations, the tracking characteristic of the reception directivity is remarkably improved, and the reception accuracy of the entire device is improved. From the viewpoint of improving accuracy, the larger the number of antennas, the better.

【0022】

The invention according to claim 7 is a transmission directional control means for imparting a first transmission directional to a transmission signal from an antenna by a first control signal, and a movement direction estimation means for estimating a movement direction on the receiving side. The directional correction control means for giving the transmission signal a second transmission directional by the second control signal based on the output of the above, and the transmission signal multiplied by the first control signal and the second control signal. It is configured to include a transmission signal processing system having a multiplying means for performing the above.

【0023】

With this configuration, the transmission directivity synthesized with the transmission signal can be corrected at high speed according to the movement of the receiving side, so that the transmission performance can be significantly improved. [0024]

Further, the invention according to claim 8 is configured such that the directivity correction control means outputs a second control signal for rotationally controlling the first transmission directivity based on the output of the moving direction estimation means.

【0025】

As a result, the transmission directivity can be reliably and easily corrected by rotating the phase of the first transmission directivity pattern.

【0026】

Further, the invention according to claim 9 is configured such that the directivity correction control means generates a second control signal so as to cancel the phase change amount obtained from the displacement in the arrival direction of the received wave.

【0027】

With this configuration, the direction of arrival of the received wave can be estimated from the received signal and the relative angle with the communication partner can be calculated, so that the directivity correction can be realized at low cost.

【0028】

Further, the invention according to claim 10 is provided independently of the transmission directivity control means and the directivity correction control means, and a single multiplication means for multiplying the transmission signal, the first control signal, and the second control signal. It was configured to multiply by.

【0029】

This simplifies the circuit and facilitates the incorporation and implementation of the directivity correction control means into the existing circuit.

【0030】

Further, the invention according to claim 12 has a configuration in which the adaptive receiving diversity device according to claim 1 and the adaptive transmitting diversity device according to claim 6 are provided in a receiving unit and a transmitting unit, respectively.

【0031】

As a result, when a portable wireless communication device having transmission slots and reception slots alternately in a time-division manner is used while moving, the transmission / reception accuracy is improved.

【0032】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1, 2, 3, and 4.

【0033】

(Embodiment 1) FIG. 1 is a block diagram of an adaptive receiving diversity device according to a first embodiment of the present invention. Further, FIG. 2 is a reception (transmission) directivity pattern diagram in the present invention, and FIG. 3 is an explanatory diagram of reception (transmission) phase rotation in the present invention. The adaptive reception diversity device includes a plurality of receiving antennas 101, 102, 103, 104, a receiving directional control device 109 that controls the input from each antenna so as to be directional, and a receiving directional control device. Multipliers 105, 106, 107, 108 that multiply the output and the input from each antenna, adder 113 that synthesizes the output of the multiplier, judge 112 that determines the output of the adder 113, and adder 113. The error detector 111 that detects the error of the determination device 112, the moving direction estimator 110 that estimates the moving direction on the transmitting side, and the directional rotating device 114 that rotates the directivity based on the output of the moving direction estimator 110. It is composed of and. Each operation will be described below.

【0034】

The receiving antennas 101, 102, 103, 104 receive the propagated radio waves. The number of antennas is not four, and may be reduced or increased. The input from each of these antennas and the output of the reception directivity control device 109 are multiplied by the multipliers 105, 106, 107, and 108, respectively, and combined by the adder 113. Vector display of the input signal from the antenna at time t, S (t) = {S₁(t), S₂(t), S₃(t), S₄(t)}^TThen, the output (weight) of the reception directivity controller that multiplies the signal from each antenna is W (t) = {W.₁(t), W₂(t), W₃(t), W₄(t)}^TThen, the output S (t) of the adder 113 is [Number 3]

<img file="JPH10285104A_D0003.tif" />Can be expressed as.

【0035】

The determination device 112 makes a hard determination of the output of the adder 113. Assuming that the determination result is D (t), the error detector 111 outputs the difference between D (t) and S (t) and gives it to the reception directivity control device 109. The reception directivity control device 109 updates the value of the weight to be multiplied by the input signal from the antenna based on this. The reception directivity pattern according to the first embodiment of the present invention is not finally determined by this update algorithm, but for example, the reception directivity control device 109 may be used. [Number 4]

<img file="JPH10285104A_D0004.tif" />Update its output as follows.

【0036】

The moving direction estimator 110 estimates the moving direction on the transmitting side. The moving direction may be estimated by any method. For example, the position information may be transmitted to the transmitting side using a GPS receiver or the like, or the relative moving direction may be detected using GPS to the receiving side. There is a method and a method of utilizing the reception directivity generated from the received wave as described later.

【0037】

The directional rotation device 114 rotates the reception directional pattern according to the estimated moving direction of the transmitting side. As shown in FIG. 3, the direction of the transmitting side as seen from the receiving side is θ301, and the position normalized by wavelength with respect to the reference point of each antenna element is (x)._i, y_i), Then (x) on the xy plane_i, y_iThe phase shift from the reference point 306 at the antenna Ai position 305 at) is [Number 5]

<img file="JPH10285104A_D0005.tif" />【0038】

It can be expressed as. However, φ is the angle 302 between the antenna Ai position 305 and the reference point 306, and x_icosθ-y_iIt may be sin θ.

【0039】

If the phase shift expressed in Equation 5 is expressed in radians, it is 2π (x)._icosθ-y_isinθ) 304. This is the amount of phase change from the reference point 306 at the antenna Ai position 305. The incident angle θ may be obtained in any way, and for example, the position information measured by the transmitter side using a GPS receiver or the like can be used in the received signal. Further, the direction in which the maximum gain of the directional pattern formed by the reception directional control device can be obtained can also be used. Further, regardless of the receiving power, a direction having a high ratio of desired signal power to interference signal power can be used. In these cases, the arrival direction of the received wave can be estimated from the received signal and the relative angle with the communication partner can be calculated, which is convenient in terms of cost.

【0040】

The amount of change in distance between the case where the transmitting side moves and the angle seen from the receiver is angle θ + α and the case where the angle θ is Δl_iIs calculated and converted to radian, the amount of phase change Δθ that affects each antenna._iCan be sought. Phase change amount Δθ_iThe directivity of the antenna can be rotated by multiplying the input of each antenna by a value that cancels out the above. The distance difference from the reference point when the angle is θ + α is, for example, [Number 6]

<img file="JPH10285104A_D0006.tif" />Since it can be expressed as, etc., the amount of distance change due to the movement of the transmitting side l_iIs [Number 7]

<img file="JPH10285104A_D0007.tif" />Can be expressed as. When the formula is transformed [Number 8]

<img file="JPH10285104A_D0008.tif" />It can be expressed as, converted to radian, and the amount of phase change Δθ._iWhen you ask [Number 9]

<img file="JPH10285104A_D0009.tif" />Will be. Therefore, the phase of the antenna Ai changes by Δθi when the mobile device moves by α, so if the conjugate complex number that cancels the change is multiplied by the weight of the antenna Ai, the phases of the signals from each antenna will be aligned at the reference point. In other words, the directivity can be formed and synthesized in the direction moved by α, and the reception performance can be improved. The conjugate complex number to be multiplied is, for example:

[Number 10]

<img file="JPH10285104A_D0010.tif" />Distance change amount l_i_、Phase change amount Δθ_I_、Conjugate complex number ΔW_iThe result does not change even if a certain value is added or multiplied regardless of i. As described above, according to the first embodiment of the present invention, the reception directivity can be rotated according to the movement of the transmission side, so that the reception performance can be improved.

【0041】

(Embodiment 2) FIG. 4 is a block diagram of an adaptive transmission diversity device according to the second embodiment in which the present invention is applied to a transmitter.

【0042】

In the second embodiment shown in FIG. 4, the transmission signal generator 401 that generates a transmission signal, the receiving antenna 402, the movement direction estimator 403 that estimates the movement direction, and the transmission directivity pattern that forms the transmission directivity pattern are formed. The sex control device 405, the directivity rotation device 404 that rotates the directivity based on the output of the moving direction estimator, and the multipliers 406, 407, 408, 409 that multiply the output of the transmission directivity control device and the transmission signal. , Consists of multiple antennas 410, 411, 412, 413 for transmission. Multiple receiving antennas may be prepared [0043]

Rotating the directivity of the antenna is the amount of change in distance between the case where the receiving side moves and the angle seen from the transmitter is angle θ + α and the case where the angle θ is Δl._iIs calculated and converted to radian, the amount of phase change Δθ that affects each antenna._iCan be sought. Phase change amount Δθ_iIt is performed by multiplying the input of each antenna by a value that cancels out and synthesizing.

【0044】

The transmission signal generated by the transmission signal generator 401 is transmitted from the transmission antennas 410, 411, 412, and 413 by multiplying the transmission directional pattern signal which is the output of the transmission directional control device 405. At that time, when the receiving side is moving, the directional rotation device 404 rotates the directivity in consideration of the moving direction of the receiving side estimated by the moving direction estimator 403. As a result, it is possible to cope with a sudden movement on the receiving side.

【0045】

[Effect of the invention]

As is clear from the above description, according to the present invention, the directional pattern at the time of reception can be accurately followed even if the source moves at high speed, and the directional pattern at the time of transmission can be followed. Can be followed even if the receiving party moves at high speed.

【0046】

Further, if the present invention is applied to the receiving unit and the transmitting unit, respectively, the transmission / reception accuracy of the portable communication device having the transmitting slots and the receiving slots alternately in a time-division manner is improved when the mobile communication device is used while moving.

[Simple explanation of drawings]

[Figure 1]

The block diagram of the adaptive receiving diversity apparatus in Embodiment 1 of this invention.

[Figure 2]

The reception (transmission) directional pattern diagram in the present invention.

[Fig. 3]

Explanatory drawing of reception (transmission) phase rotation in this invention.

[Fig. 4]

The block diagram of the adaptive transmission diversity apparatus in Embodiment 2 of this invention.

[Fig. 5]

Block diagram of a conventional transmission diversity device.

[Fig. 6]

Receive (transmit) directional pattern diagram.

[Explanation of symbols]

101, 102, 103, 104 antennas 105, 106, 107, 108 multiplier 109 Receiving directional controller 110 Moving direction estimator 114 Directional rotating device 403 Moving direction estimator 404 Directional rotating device 405 Transmission directional controller 406, 407, 408, 409 Multiplier 410, 411, 412, 413 antennas