Study on Open-Loop Adaptive FIR Filter Approach for Interference Suppression
自适应开环FIR滤波器抗窄带干扰方法研究

A new approach for interference suppression in DSSS communication is introduced aim at the shortcomings of the method in transform domain. It combines interference detection in transform domain with interference suppression using open-loop adaptive FIR excision filtering in time domain. The expression of receiver signal-to-noise ratio is derived and it is maximized by adjusting filter coefficients depend on the interference power and its frequency information. The numerical simulation demonstrates that the proposed method is better than FFT method in transform domain in both single-tone and multi-tone interference environment and is effective and efficient to narrowband interferences.