EP1936902A2

Sequence generating method for detection and method for transmitting and receiving signals using the same

Abstract

A sequence generation method for allowing a reception end to effectively detect a sequence used for a specific channel of an OFDM communication system, and a signal transmission/reception method using the same are disclosed. During the sequence generation, an index is selected from among the index set having the conjugate symmetry property between indexes, and a specific part corresponding to the frequency "0" is omitted from a transmitted signal. In addition, a reception end can calculate a cross-correlation value between a received (Rx) signal and each sequence using only one cross-correlation calculation based on the conjugate symmetry property.

EP1936902A2, drawing sheet 1
Sheet 1 of 94

Term

1.2 yearsto projected expiry

Projected expiry 19 December 2027, counted from filing; an application has no term until it is granted.

  1. Priority
  2. Filed
  3. Published
  4. Today
  5. Projected expiry

26 claims: 4 independent, 22 dependent

  1. 1
    A signal transmission method comprising:selecting one of root indexes contained in root-index set which enable a first sequence and a second sequence from among multiple sequences having each of the root indexes in the root-index set to satisfy a conjugate symmetry property;generating a sequence in a frequency domain or a time domain according to the selected root index;mapping the generated sequence to a frequency-domain resource element;and converting the frequency-domain-mapped sequence into a time-domain transmission signal, and transmitting the time-domain transmission signal.
  2. 10
    A signal transmission method comprising:selecting one of root indexes contained in root-index set which enable a sum of individual root indexes of a first sequence and a second sequence from among multiple sequences having each of the root indexes in the root-index set to correspond to a length of the multiple sequences;generating a sequence in a frequency domain or a time domain according to the selected root index;mapping the generated sequence to a frequency-domain resource element;and converting the frequency-domain-mapped sequence into a time-domain transmission signal, and transmitting the time-domain transmission signal.
  3. 17
    A method for calculating a cross-correlation value between a received (Rx) signal and each of multiple sequences comprising a first sequence and a second sequence, the method comprising:achieving a plurality of intermediate values generated when a cross-correlation value between the Rx signal and the first sequence from among the multiple sequences is calculated;and calculating each of the cross-correlation values between the Rx signal and the first sequence from among the multiple sequences and between the Rx signal and the second sequence from among the multiple sequences by addition or subtraction of the intermediate values, wherein a root index for the first sequence and a root index for the second sequence are set so that the first sequence and the second sequence satisfy a conjugate symmetry property.
  4. 22
    A signal transmission method using a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence, the method comprising:selecting a predetermined root index, and generating the CAZAC sequence in a frequency domain or a time domain according to the selected root index;continuously mapping the generated CAZAC sequence to a frequency resource element;and converting the frequency-domain-mapped sequence into a time-domain transmission signal, and transmitting the time-domain transmission signal, wherein the time-domain transmission signal is transmitted in a condition that a specific component corresponding to a part of a frequency "0" from the CAZAC sequence is omitted, so that the resultant time-domain transmission signal has no component corresponding to the frequency "0".