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A Blind Recognition Method of Space-Frequency Block Codes Based on Correlation Function

A technology of space-frequency grouping and identification method, applied in the field of signal processing, to achieve the effect of good robustness and good identification effect

Active Publication Date: 2020-11-03
NAVAL AVIATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two ways to combine spatial coding and OFDM technology. One is to perform space-time block coding on OFDM signals, which is called STBC-OFDM signals, and the other is to perform OFDM coding on STBC signals, which is called SFBC-OFDM signals. , there are still few algorithms for SFBC-OFDM recognition

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  • A Blind Recognition Method of Space-Frequency Block Codes Based on Correlation Function
  • A Blind Recognition Method of Space-Frequency Block Codes Based on Correlation Function
  • A Blind Recognition Method of Space-Frequency Block Codes Based on Correlation Function

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Embodiment Construction

[0050] The implementation process of the method described in this embodiment is as follows:

[0051] (1) Sampling, initializing data;

[0052] (2) Calculate the cross-correlation function G of SM-OFDM and AL-OFDM signals respectively (i,i′) (m,τ);

[0053] (3) Using method one or method two in the identification algorithm to detect the peak value of the cross-correlation function of the received signal;

[0054] (4) Repeat steps 1 to 3 for 1000 Monte Carlo simulations to calculate the probability of correct recognition.

[0055] There are no special instructions in the example, and the simulation parameters are set as follows: subcarrier N=64, cyclic prefix v=7, QPSK modulation mode is adopted, and for each transmission path, the channel is assumed to be a frequency selective channel, which includes 6 statistically independent taps, Each tap is modeled as a complex Gaussian random variable with mean 0, whose power obeys the exponential PDF, where l=0,1,...,L h -1. The s...

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Abstract

The invention discloses a space-frequency block code blind recognition method based on correlation function. The method specifically comprises the following steps: constructing a cross-correlation function of signals received by different receiving antennae, and recognizing SM-OFDM and AL-OFDM through detecting whether the cross-correlation function has a peak value, wherein an algorithm for detecting the peak value is finding the maximum value of the correlation function, if a position of the maximum value is nearby 0 or 16, judging the signals as AL-OFDM signals, and otherwise, judging the signals as SM-OFDM signals; or finding out the positions of two maximum values, if the distance between the two maximum values is 16, judging the signals as the AL-OFDM signals, and otherwise, judgingthe signals as the SM-OFDM signals. The method provided by the invention can recognize the AL-OFDM signals and the SM-OFDM signals under a totally blind condition, moreover, has better recognition effect under low noise; and the method cannot be affected by modulation modes and other factors, and has better robustness.

Description

technical field [0001] The invention belongs to the non-cooperative communication signal processing technology in the field of signal processing, and specifically refers to a method for blind identification of space-frequency block code signals based on correlation functions. Background technique [0002] The MIMO (Multiple-Input Multiple-Output) system is a key technology in the next generation wireless communication system. Among them, the blind recognition of space-time block codes (STBC) and space-frequency block codes (SFBC) has received more and more attention. Technology research is increasing. There are two ways to combine spatial coding and OFDM technology. One is to perform space-time block coding on OFDM signals, which is called STBC-OFDM signals, and the other is to perform OFDM coding on STBC signals, which is called SFBC-OFDM signals. , there are few algorithms for SFBC-OFDM identification at present. The algorithm of the present invention is aimed at identi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04B7/0413
CPCH04B7/0413H04L1/0038H04L1/0057
Inventor 凌青张立民闫文君徐涛方君
Owner NAVAL AVIATION UNIV