MULTIPATH UTILIZATION INTERFERENCE CANCELLATION METHOD BASED ON ATTENUATION COEFFICIENT COMPENSATION

The multipath environment severely affects interference cancellation performance. Traditional methods usually treat multipath signals as detrimental factors to be suppressed, leading to desired signal loss and interference null deviation. To address this issue, this paper fully exploits the useful information of multipath signals and proposes a multipath utilization interference cancellation method based on attenuation coefficient compensation. First, the mechanism behind the performance degradation of interference cancellation under multipath effects is revealed by theoretical analysis: multipath coupling causes mismatches in the composite steering vector. Then, this paper uses the coherent superposition characteristics of multipath signals, estimates the multipath attenuation coefficients through constrained optimization, and introduces an anti-diagonal matrix to compensate for the steering vector error. Finally, the effectiveness of the proposed method is proved by simulations. The results show that within the interference angle range of 0°-20°, the proposed method improves the desired signal gain by up to 24 dB while controlling null deviation within 0.05°. This method significantly enhances signal retention capability in multipath environments and effectively corrects null positioning deviations through precise attenuation coefficient compensation, offering a new technical approach for interference suppression under complex channel conditions.