干扰对消系统的非零带宽性能与延时匹配

分析了干扰信号非零带宽下，实际自适应干扰对消系统的频域特性和时域特性。非零带宽信号使系统时变，当带宽远小于中心频率时，系统可近似为自适应梳状滤波器。系统的平均收敛速度与总参考信号幅值成正比，干扰对消比随信号带宽的增大而减小。对耦合延时匹配进行了理论和仿真分析，分析表明，耦合延时匹配可以显著提高宽带干扰对消比和对消带宽，延时匹配越精确，对消效果越好。

Nonzero bandwidth performance and time delay matching of interference cancellation system

The frequency-domain and time-domain characteristics of adaptive interference cancellation system were analyzed, when interference signal had nonzero bandwidth. The nonzero bandwidth interference signal made the system a time-variation system. When the bandwidth was far less than the center frequency, the interference cancellation system cruld be approximated as an adaptive comb filter. The average convergence speed of the system was proportional to the overall reference signal gain, and the interference cancellation ratio (ICR) decreased with the increase of the bandwidth. The theoretical and simulation analyses of couple time delay matching reveal that the precise time delay matching can improve ICR significantly.