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针对S-随机交织器传统算法不能保证其搜索一定成功且存在延时较大的问题,本文提出了一种改进算法.改进算法基于Logistic混沌映射,提高了交织器的可控随机性,从而使算法的随机性和确定性得到较好的平衡,克服了传统算法的不足.仿真结果表明,帧长为1 000~5 000时,改进算法的交织延时比传统算法降低了2 294~97 380倍左右.在帧长为2 048时,改进算法比传统算法提高了0.05dB的编码增益,比第三代合作伙伴计划算法(3GPP)提高了0.1dB的编码增益.
Aiming at the problem that the traditional S-random interleaver algorithm can not guarantee the success of the search and the large delay exists, an improved algorithm is proposed in this paper. The improved algorithm improves the controllability of the interleaver based on Logistic chaotic map, The randomness and certainty of the algorithm are well balanced and the deficiencies of the traditional algorithms are overcome.The simulation results show that the interleaving delay of the improved algorithm is 2 294 ~ 97 380 less than the traditional one when the frame length is 1 000 ~ 5 000 At the frame length of 2048, the improved algorithm has improved the encoding gain of 0.05dB compared with the traditional algorithm and the encoding gain of 0.1dB higher than the third generation partnership project (3GPP) algorithm.