完全互补码CDMA系统的性能仿真

Performance simulation of CDMA system based on complete complementary code

为了减小直接扩频CDMA系统中各用户的多址干扰,研究了一种特殊的扩频序列——完全互补码。介绍了完全互补码的概念和性质,给出了一种完全互补码的生成方法,提出了一种新的扩展完全互补码的方法,讨论了基于完全互补码的CDMA系统模型。对该模型在加性高斯白噪声信道和瑞利衰落信道中的性能进行了仿真,并与基于G o ld序列和m序列的CDMA系统的性能进行了分析比较。结果表明,基于完全互补码的CDMA系统具有很好的抗多址干扰性能。

To reduce multiple access interference in DS-CDMA system, a special spreading sequence- complete complementary code （CC code）＇ was researched. The concept and properties of CC code were introduced, and a method for generating this kind of code was also presented. Then the new way for extending CC code was given, and a CDMA system model based on CC code was described. Moreover, the performance simulations for the model in an AWGN channel and Rayleigh fading channel were studied, and comparisons among Gold sequence based CDMA system and m sequence based CDMA system were made. The simulation results show that the CC-code based CDMA system can significantly reduce the impact of multiple access interference on a CDMA system.