Adaptive filter using decision-feedback to suppress BPSK interference in spread spectrum systems

The research results on tone interference suppression are extended to BPSK interference suppression by analyzing the signal characteristics of the BPSK interference. Methods including one called "sign inversion of interference estimation output controlled by error" are promoted and the valid conditions of the method are analyzed. Simulation results show that applying the new method under valid conditions can make more significant improvement (about 26 dB) in the convergence performance of algorithms for suppressing BPSK type narrow band interference than previous results made without the new method.