Encoding and decoding method for wireless communication physical layer communication security

Abstract

The invention proposes a communication security encoding and decoding method at the physical layer of wireless communication, which can significantly reduce the probability of information being stolen by using the invention. The present invention is realized through the following technical solutions: the sending end uses an LDPC encoder to encode the message bit sequence, performs a bit XOR operation on some bits of adjacent codewords at the sending end to obtain a new bit sequence, and the BPSK modulator generates a new bit sequence Bits and parity bits not involved in the operation are modulated into BPSK symbols and sent to the receiving end; the BPSK demodulator at the receiving end demodulates the code according to the codeword message bit prior information fed back by the LDPC decoder at the receiving end and the channel received symbols The logarithmic likelihood ratio LLR value of the word parity bit; the LDPC decoder at the receiving end calculates the LLR value of the message bit, decodes the message bit of the current codeword, and feeds back the LLR value of the message bit of the codeword back to the receiving end for BPSK demodulation device, and iteratively proceeds until the message bits of all codewords 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

Images