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

A codec method and wireless communication technology, which is applied in the fields of information theory security and communication information security, can solve problems such as limited application scenarios and limited security gap capabilities, and achieve the effects of enhancing security, reducing security gaps, and increasing difficulty

Active Publication Date: 2019-09-13
10TH RES INST OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional encoding and decoding methods do not have this feature, so the ability t...

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

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Embodiment Construction

[0023] refer to figure 1 . According to the present invention, the wireless communication sending end uses the LDPC encoder to encode the message bit sequence, and divides the codeword into two parts, the message bit and the parity bit, and performs a bit XOR operation on some bits of adjacent codewords at the sending end, Obtain a new bit sequence; process the sequence through serial-to-parallel conversion, use the BPSK modulator at the sending end to modulate the newly generated bits and the parity bits that have not participated in the operation into BPSK symbols and send them to the receiving end; BPSK symbols and the prior logarithmic likelihood ratio LLR value of the preorder codeword message bit, demodulate the logarithmic likelihood ratio LLR value of the codeword check digit, and the logarithmic likelihood ratio of the codeword check digit The ratio LLR value is passed to the LDPC decoder at the receiving end; the LDPC decoder at the receiving end initializes the lo...

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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...

Claims

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Application Information

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IPC IPC(8): H04L1/00H03M13/11
CPCH03M13/1105H04L1/0061
Inventor 杜俊逸肖磊李涛黄秀琼乔文昇
Owner 10TH RES INST OF CETC
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