Adaptive Interference Suppression Based on Single-channel Optimal Constant Modulus Algorithm
Shi Qing-yan①② Wu Ren-biao② Zhong Lun-long②
①(National Key Laboratory for Radar Signal Processing, Xidian University, Xi’an 710071, China) ②(Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China)
Abstract：Taking account of the constant modulus characteristic of most interference signals in civil aviation air-to-ground communication, a single-channel optimal constant modulus algorithm is proposed. In this algorithm the amplitude and phase of the constant signal are estimated with nonlinear least squares method. Interference suppression is realized by subtracting the constant modulus signal from the mixed signal. This method has good compatibility with existing communication systems, and the number of channel is not increased. The convergence problem of the adaptive interference suppression can be avoided. Simulation and experimental results are provided to demonstrate the performance of the proposed method.
2011, Vol. 33 
