Signal detecting method and device

Patent metadata

Field	Value
Publication number	US-9729277-B2
Application number	US-201615331875-A
Country	US
Kind code	B2
Filing date	Oct 23, 2016
Priority date	Dec 14, 2015
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A signal detecting method and device are disclosed. The method includes: obtaining a matched filtering signal; determining a filtering matrix; decomposing the filtering matrix to obtain a principal diagonal matrix and a non-principal diagonal matrix; obtaining a parameter matrix and a parameter vector according to the principal diagonal matrix, the non-principal diagonal matrix, and the matched filtering signal; obtaining an iterative parameter and an iterative initial value according to the parameter matrix and the parameter vector; and performing an iterative calculation according to the iterative parameter and the iterative initial value; if the number of iterations reaches a preset number, obtaining an iterative final value, and obtaining an input of a decoder according to the iterative final value. The signal detection method may reduce the computational complexity and bit error rate, improve data throughput, and more advantageous for use in a large-scale multi-input multi-output system.

First claim

What is claimed is:

1. A signal detecting method, applied to a base station which is configured to receive an encoded signal, and comprising:
obtaining, with one or more processors, a matched filtering signal, a channel Gram matrix and a filtering matrix, wherein the matched filtering signal is obtained by performing antenna matched filtering on the encoded signal;
determining, with the one or more processors, a filtering matrix used when obtaining the matched filtering signal according to a channel matrix, a noise power spectrum density, an average power for each transmission signal, a unit matrix and the number of antennas in the antenna array of the base station;
decomposing, with the one or more processors, the filtering matrix to obtain a principal diagonal matrix and a non-principal diagonal matrix;
obtaining, with the one or more processors, a parameter matrix and a parameter vector for an iterative calculation according to the principal diagonal matrix, the non-principal diagonal matrix, and the matched filtering signal;
obtaining, with the one or more processors, an iterative parameter and an iterative initial value according to the parameter matrix and the parameter vector; and
performing, with the one or more processors, the iterative calculation according to the iterative parameter and the iterative initial value;
if the number of iterations reaches a preset number, obtaining an iterative final value with the one or more processors, and obtaining with the one or more processors an input of a decoder according to the iterative final value, so as to decode the encoded signal and to realize a signal detecting.

2. The signal detecting method according to claim 1 , wherein, obtaining a matched filtering signal comprises:
obtaining the matched filtering signal by a formula of
y MF =H H y,

where, y is the encoded signal which is a signal via a channel received by an antenna array of the base station, y MF is the matched filtering signal, H is a channel matrix, and H H is a conjugate transpose matrix of the channel matrix H.

3. The signal detecting method according to claim 1 , wherein the filtering matrix is obtained by a formula of
A=H H H+N 0 E s −1 I M ,

where, A is the filtering matrix, H is the channel matrix, H H is a conjugate transpose matrix of the channel matrix H, N 0 is the noise power spectrum density, E s is the average power for each transmission signal, E s −1 is a reciprocal value of the average power for each transmission signal, I M is the unit matrix, and M is the number of antennas in the antenna array of the base station.

4. The signal detecting method according to claim 1 , wherein, obtaining a parameter matrix and a parameter vector for an iterative calculation according to the principal diagonal matrix, the non-principal diagonal matrix, and the matched filtering signal comprises:
obtaining the parameter matrix according to the principal diagonal matrix and the non-principal diagonal matrix by a formula of
R=P −1 Q,

where, R is the parameter matrix, P is the principal diagonal matrix, P −1 is an inverse matrix of the principal diagonal matrix, and Q is the non-principal diagonal matrix;
obtaining the parameter vector according to the principal diagonal matrix and the matched filtering signal by a formula of
T=P −1 y MF ,

where, T is the parameter vector, and y MF is the matched filtering signal.

5. The signal detecting method according to claim 1 , wherein, the iterative parameter comprises an iterative coefficient matrix and an iterative constant matrix;
and obtaining an iterative parameter and an iterative initial value according to the parameter matrix and the parameter vector, comprises:
obtaining the iterative coefficient matrix according to a time relaxation parameter and the parameter matrix by a formula of
B =(1−ω) I−ωR ,

where, B is the iterative coefficient matrix, ω is the time relaxation parameter, and I is a unit matrix, R is the parameter matrix;
obtaining the iterative constant matrix according to the time relaxation parameter and the parameter vector by a formula of
F=ωT,

where, F is the iterative constant matrix, T is the parameter vector; and
obtaining the iterative initial value according to the parameter matrix and the parameter vector by a formula of
ŝ (0)=( I−R ) T,

where, ŝ(0) is the iterative initial value.

6. The signal detecting method according to claim 5 , wherein, performing the iterative calculation according to the iterative parameter and the iterative initial value, comprises:
performing the iterative calculation by a formula of
ŝ ( k )= Bŝ ( k −1)+ F,

where, k is the number of iterations, and k is a positive integer equal to or greater than 1.

7. The signal detecting method according to claim 1 , wherein, wherein obtaining an input of a decoder according to the iterative final value comprises:
obtaining a computation signal according to the iterative final value and principal diagonal elements of an effective channel gain matrix by a formula of

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Assignees

• Univ Tsinghua

Inventors

• Liu Leibo
• Peng Guiqiang
• Zhang Peng
• Xue Yang
• Yin Shouyi
• Wei Shaojun

Classifications

• H04B7/0413

  MIMO systems · CPC title

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• H04B7/04

  using two or more spaced independent antennas · CPC title

• H04L5/006

  Quality of the received signal, e.g. BER, SNR, water filling · CPC title

• H04W88/08

  Access point devices · CPC title