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本文对采用迭代译码技术的混沌相移键控(CPSK)CDMA系统进行了深入研究,所述迭代译码技术为列表双向软输出LBSO算法。具体地,所述迭代译码技术是基于外部信息的归一化来设置的,通过仿真,将获得的采用LBSO技术的CPSK-DSCDMA系统的比特率BER与没有采用上述译码技术的CDMA系统的比特错误率BER进行比较,发现前者的性能要远远好于后者。同时,采用LBSO译码技术的系统的误码率也要好于采用维特比软输出SOVA译码技术的系统。
In this paper, the chaos phase shift keying (CPSK) CDMA system using iterative decoding technology is studied in depth. The iterative decoding technique is LBSO algorithm of list bidirectional soft output. Specifically, the iterative decoding technique is set based on the normalization of external information. The bit rate BER of the obtained CPSK-DSCDMA system using the LBSO technique is compared with that of the CDMA system without the above decoding technique Bit error rate BER comparison found that the former performance is much better than the latter. At the same time, systems using LBSO decoding also have better bit error rates than systems using Viterbi soft-output SOVA decoding.