A ldpc decoding method based on relay cooperation

Abstract

The invention discloses an LDPC decoding method based on relay cooperation. The steps are: step A, the source node broadcasts information to the destination node and the relay node; step B, the destination node decodes and outputs the received source information After verification, set the retransmission request information F according to the verification result, and forward the retransmission request information F to the relay node. If the decoding is correct, return to step A, otherwise go to step C; step C, the relay node Perform adaptive demodulation according to the received retransmission request information, and forward it back to the aforementioned destination node; step D, the destination node performs correlation estimation based on the received source information and relay node forwarding information, and calculates the bit flip probability ; Step E, the destination node designs an iterative LDPC decoding algorithm based on the bit flip probability, and according to the received source information and the forwarding information of the relay node, and outputs the source information. This method can make full use of the information forwarded by the relay node, and improve the reliability of LDPC decoding of the source information.

Description

technical field [0001] The invention relates to an LDPC decoding method based on relay cooperation used by a destination node in a relay communication scenario, in an information mode with high energy efficiency of the relay node. Background technique [0002] In order to make full use of limited wireless resources and meet people's growing demand for high-speed, high-quality data transmission, relay cooperation technology is introduced in wireless communication to improve system transmission performance. Constructing a low-complexity channel coding approaching the Shannon limit suitable for relay scenarios has always been an important research content for relay cooperative communication. [0003] At present, LDPC code has been used as a long code block coding scheme for 5G mobile broadband service data information. The coding and decoding method of LDPC code based on check matrix design has stronger error correction ability, and its iterative decoding algorithm is a parall...

AI Technical Summary

Problems solved by technology

[0004] Common processing methods for relay nodes to information: amplify and forward (AF), decode and forward (DF); among them, AF has lower implementation complexity than DF, but its system transmission quality is poor

If the relay node directly demodulates and forwards the received information, the energy efficiency of the relay node can be effectively improved, but there is a problem of high bit error rate of the forwarded information

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