直接序列扩谱CDMA系统中盲窄带干扰抑制

提出一种基于FFT的窄带干扰盲抑制算法。在有强窄带干扰的直扩系统中,通过对接收信号做FFT,保存相位谱,对幅度谱进行硬限幅,利用限幅后的幅度谱与保存的相位谱重构信号,可以大大降低干扰信号的功率,从而实现干扰抑制。该算法适合各种窄带干扰,并且与干扰是否时变特性无关。同时干扰带宽越窄,干扰抑制效果越明显。由于本算法只利用FFT,适合实时处理。

Blind Suppression of Multiple Narrowband Interferences in DSS/CDMA Systems

A way to suppress narrowband interference (NBI) blindly was proposed based on FFT. Through storing the phase spectrum of the received signal and hard limiting the magnitude spectrum, the signal was reconstructed using the stored phase spectrum and limited magnitude spectrum. During that process, the power of the narrowband interferences was decreased greatly, thus the suppression of the NBI was achieved. The method can suppress various interferences. The narrower the bandwidth of the interference is, the more the remarkable results can be gained. As the main computation is FFT, the proposed way is very suitable to real-time processing.