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在考虑多用户干扰、色散效应和差拍噪声的情况下 ,分析了Turbo码对二进制脉冲位置调制 (BPPM)的快跳频光码分多址 (FFHOCDMA)系统性能的影响 在均匀交织器的情况下 ,用Turbo码的条件重量枚举函数得到了该系统的误码率的上界 数值模拟表明 ,Turbo码对FFHOCDMA系统的误码率性能有明显的改善 ,并且随着用户数的提高 ,Turbo码对误码率的改善程度也随之提高 也就是说 ,在一定的误码率性能要求下 ,Turbo编码的FFHOCDMA系统增加了同时使用的用户数
The effects of Turbo codes on the performance of fast frequency hopping optical code division multiple access (FFHOCDMA) systems based on binary pulse position modulation (BPPM) are analyzed in the context of multiuser interference, chromatic dispersion and beat noise. In the case of uniform interleaver Under the conditional weight enumeration function of Turbo code, the numerical simulation of the upper bound of the bit error rate of the system shows that Turbo codes improve the bit error rate performance of FFHOCDMA system significantly. With the increase of number of users, Turbo In other words, at a certain bit error rate performance requirement, the Turbo-coded FFHOCDMA system increases the number of concurrent users