Space-time block code blind identification method and system based on space-time correlation matrix

Abstract

The invention belongs to the technical field of signal processing, and particularly relates to a space-time block code blind identification method and system based on a space-time correlation matrix, and the method comprises the steps: receiving a signal through synchronous sampling of a transmitting end and a receiving end in a communication system, carrying out the preprocessing of the received signal, and obtaining a plurality of groups of received signal samples; setting a value range of the delay quantity, and calculating a space-time correlation matrix corresponding to each group of received signal samples under each delay quantity in the value range of the delay quantity; performing redundancy-eliminating whitening processing on elements in the space-time correlation matrix under each delay amount in the received signal sample, and constructing a space-time block code feature vector by calculating a Frobenis norm square value of the space-time correlation matrix after the whitening processing; and taking the space-time block code feature vectors as model input, and performing classification identification on space-time block code features by using the trained BP neural network. The method can meet the identification requirement of the STBC type in MIMO communication, can be directly applied to a non-cooperative MIMO system and the like, and has good applicability.

Description

Technical field [0001] The present invention belongs to the field of signal processing, and in particular, the present invention relates to a blind recognition method and system of an empty time-based group code based on an empty time-related matrix. Background technique [0002] With the large-scale popularization of 5G mobile communications, the evolution of WiFi technology, multipleinput multiple output, miPleinput Multiple Output, MIMO) communication technology has become more extensive applications in practical communication systems, and this is blinded The problem is also gradually received by the scholars; empty time-out code as coding scheme in MIMO, to realize blind joining of the MIMO communication system to effectively identify the empty time division code used by the system, so empty time packet code Blind recognition has important research value. [0003] At present, the recognition algorithm for air-time packetization code is mainly divided into a traditional method...

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Problems solved by technology

[0003] At present, the recognition algorithms for space-time block codes are mainly divided into traditional methods based on feature extraction and methods based on deep learning in terms of methods; space-time block codes, but different space-time block codes with the same code length cannot be distinguished. The maximum size of the identifiable code set in the current traditional method is 5; The size of the set is increased to 6, but for the worse Rayleigh channel, the receiver is not ideal and the recognition performance will decrease when there are different degrees of timing errors

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