An Adaptive Feedback Interference Cancelling Algorithm Based on Independent Component Analysis for Wireless Repeaters

In this paper, we propose a modified algorithm based on complex ICA (independent component analysis) for cancelling the feedback interference in the WCDMA repeater under time-varying multi-path channels. The proposed algorithm made use of Non-Gaussian distribution character of the signals and separated feedback from received signals by estimating feedback path adaptively in the frame work of ICA. The algorithm was evaluated through computer simulation by being applied to the feedback cancelling filter of the WCDMA repeater. The simulation results demonstrated that the proposed one is superior to the conventional LMS algorithm in terms of the cancelling performance.