Coding and decoding method for communication security of wireless communication physical layer

Abstract

The invention provides a coding and decoding method for communication security of a wireless communication physical layer, and the coding and decoding method can be used for remarkably reducing the probability that information is stolen. The invention is realized through the following technical scheme: the sending end encoding the message bit sequence by using an LDPC encoder, performing a specific OR operation on a part of bits of adjacent code words of the sending end to obtain a new bit sequence, and the BPSK modulator modulating the newly generated bits and check bits which do not participate in the operation into BPSK symbols and sends the BPSK symbols to the receiving end; the receiving end BPSK demodulator demodulating the logarithm likelihood ratio LLR value of the code word checkbit according to the code word message bit prior information fed back by the receiving end LDPC decoder and the channel receiving symbol; and the LDPC decoder at the receiving end calculating a message bit LLR value, decoding the message bit of the current code word, and feeding the code word message bit LLR value back to the BPSK demodulator at the receiving end, so that iteration is carried outuntil the message bits of all code words are decoded.

Description

technical field [0001] The invention relates to the field of information theory security, especially the technical field of communication information security, and is mainly used in the physical layer of wireless communication to ensure the communication security of the low density parity check (LDPC) encoding and decoding method of the physical layer. Background technique [0002] With the rapid development of computer information technology, traditional wired communication is gradually replaced by wireless communication. As the current mainstream communication method, wireless communication has certain potential safety hazards in its open communication method, which poses a greater threat to the security of the entire communication. In a wireless communication system, the broadcast characteristics of electromagnetic signal propagation and the open characteristics of wireless channels enable any user within a certain range to have the ability to receive wireless transmissio...

AI Technical Summary

Problems solved by technology

Traditional encoding and decoding methods do not have this feature, so the ability to reduce the security gap is limited, and the applicable application scenarios are limited

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