RF Cancellation System Based on Inverse QRD_RLS Weight Extraction

The co-site self-interference is a serious problem on the space-limited and radio system highly integrated combat platforms, presenting urgent needs for the adaptive interference cancellation technology to solve its in-band interference. However, the convergence speed of the traditional method based on ALMS algorithm is greatly affected by the characteristic value of self-interference signal, and it is difficult to meet the demand of microsecond cancellation speed for frequency hopping system. In this paper, a digital-controlled RF self interference cancellation system based on the least squares principle is proposed. Simulink simulation results show that under the same condition, the cancellation speed is increased by one order of magnitude, and the cancellation ratio upper bound is higher when compared with the traditional ALMS algorithm, which proves the feasibility and effectiveness of the proposed system.