为了研究级联编码对DS／BPSK系统性能的影响，设计了一种基于RS与卷积码级联编码的DS／BPSK系统，分析了该级联编码直扩系统的性能，仿真了在纠错编码参数发生改变时的系统性能。仿真结果表明，级联编码的DS／BPSK系统性能比单码编码的DS／BPSK系统性能要好。在RS码参数保持不变时，降低卷积码的码率，采用软判决方式译码以及多比特软判决，能有效提升系统性能；同时，交织在一定程度上能改善系统的性能。%To investigate the effect of concatenated coding scheme on DS/BPSK communication system, a RS and convolutional code concatenated DS/BPSK system was designed, the performance analysis of the proposed coded system was presented and the performance comparison when the system employed different error correction parameters was simulated. Simulation results demonstrate that the concatenated coding scheme in the DS/BPSK outperforms single code coding scheme. With the RS code parameters fixed,when the eonvolution code rate is lower and the decoding decision type is soft - decision with more decision bits, the system performance would be better. In addition, interleaving is an effective method to improve system performance to some extent.
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