Abstract:

This paper focuses on blind separation and data recovery of multiple cofrequency linear modulation signals in single-channel which is an important and touchy issue in uncooperative communications. A novel method based on bit-interleaved code modulation iterative decoder (BICM-ID) algorithm is proposed, which combines demodulation with decoding and can recover multiple source signals from a single-channel mixed signal. Based on theoretical analysis and mathematical derivation, an algorithm for demapping of mixed signals is provided. Theoretical analysis and simulation results show that the new algorithm can directly recover all the source signals in a single-channel mixed signal without the need of separating the mixed signal. The algorithm of the advantages of low computational complexity and lower bit error rate (BER) for both non-inter symbol interference (ISI) and ISI additive white Gaussian noise (AWGN) channels,  is suitable for the situations of equivalent as well as non-equivalent power mixed signals.