通道失配降低了窄带副瓣对消系统的性能,采用多辅助通道多抽头延迟线的宽带对消算法可以提高对消性能。鉴于对群延迟处理的FIR滤波器应为非因果滤波器,文中提出了非因果的副瓣对消器,该算法通过对主通道或辅通道信号的延迟,获得了对消权系数的非因果特性,从而构成了非因果的空时二维对消算法。通过实验对算法性能进行了对比,结果表明,该非因果宽带对消算法比因果算法具有更好的对消性能。

Channel mismatch gives rise to much degradation of the side-lobe cancellation systems.Its performance can be improved by broad band cancellation algorithms.According to the non-causal characteristic of the FIR filter dealing with the channel time delay,non-causal side lobe canceller is proposed in this paper.The non-causal characteristic of the weight vector is achieved by delaying the main or the auxiliary channel signal.Hence,the algorithm is called non-causal Space-time domain canceling algorithm.Its performance is tested by experiment data.The results show that it has better performance than that of the causal algorithm.

TN957.51