Low-complexity joint MLSE receiver in the presence of CCI

We address the problem of receiving a digitally modulated signal in the presence of another identically modulated cochannel interference (CCI) signal. We propose a joint maximum-likelihood sequential estimation (MLSE) algorithm that uses a dynamic channel description (J-MLSE/DCD). This algorithm deals with CCI more effectively while keeping the overall complexity low. In the proposed algorithm, we adaptively truncate the channels of both the desired signal and the CCI according to their individual power, thereby greatly reducing the complexity. Simulation results for the GMSK modulated signals used in the Global System for Mobile Communications (GSM) system are presented. The proposed algorithm performs much better than the spatial-whitened MLSE and is comparable to the high-complexity joint MLSE.