码辅助技术抑制直扩系统数字窄带干扰性能

Performance of Code-aided Digital NBI Suppression in DSSS

直扩系统在共道信道中的优越性使其在无线通信系统中得到广泛应用,而强窄带干扰的出现严重影响直扩系统性能。数字窄带干扰不同于准确定性窄带干扰和熵窄带随机过程,是一种新型窄带干扰,码辅助技术(Code-aidedtechn iques)是抑制这种窄带干扰的新途径。通过仿真,研究比较MMSE码辅助检测技术、解相关码辅助检测技术和匹配滤波检测技术在抑制直扩系统数字窄带干扰性能上的差异,总结得出MMSE码辅助检测技术是解相关码辅助检测技术和匹配滤波检测技术的折衷,但在抑制窄带干扰的情况下并无差异的重要结论。

DSSS (Direct-sequence Spread-spectrum System) was widely used in wireless communication because of its well co-channel performance. Well, there were many strong narrow band interferences in DSSS and the performance of DSSS was affected. Digital NBI (Narrow Band Interference) was different from quasi-deterministic signals and entropic narrow-band stochastic processes and code aided techniques was the solution of this NBI. It was studied the different performance of MMSE code-aided techniques, decorrelation code-aided techniques and matched filter techniques. Finally,it showed the very important conclusion that MMSE code-aided techniques was the compromise of decorrelation code-aided techniques and matched filter techniques in digital NBI suppression of DSSS, but had no difference in suppressing NBI.