5G-LDPC码编码调制重传的交织优化OA

For the hybrid automatic repeat request mechanism of low-density parity-check(LDPC)codes,this paper investigates coded modulation and interleaving optimization in 5G systems.First,the rate matching and existing interleaving methods in 5G systems are analyzed.The protograph-based extrinsic information transfer(PEXIT)algorithm is then used to conduct theoretical analysis and threshold calculation for retransmission interleaving methods,and the impact of interleaving methods under multiple retransmissions with different coded modulation schemes on reception performance is further explored.Then,based on the PEXIT algorithm,an interleaving optimization algorithm is proposed for different redundancy versions,including RV0,RV1,RV2,and RV3,to improve the overall reception performance.Simulation results show that,by optimizing the interleaving method,the data from different redundancy versions can achieve a performance gain of 0.2～0.5 dB during combined decoding,thereby significantly improving the transmission performance of high-order modulation retransmission systems and providing a new idea and implementation method for the design of coded modulation schemes with multiple retransmissions in 5G and future 6G communication systems.