Walsh Code Soft Spread Spectrum Multi-tone Interference Suppression Algorithm

For the difficulty of multi-tone interference suppression for adaptive filters based on least mean square criterion, an improved algorithm is proposed to realize multi-tone interference suppression for Walsh code soft spread spectrum signals. The algorithm firstly decomposes the received signal by empirical mode, and obtains a series of intrinsic mode function with monophonic interference. Then, the adaptive filters based on least mean square is performed on the intrinsic mode function to obtain multi-tone interference. Finally, the Walsh code soft spread spectrum signal is realized Multi-tone interference suppression. The simulation results show that the algorithm can realize the multi-tone interference suppression of Walsh code soft spread spectrum signal within a certain SNR range.