Low complexity joint MLSE receiver in the presence of CCI

In this paper, we address the problem of receiving a digitally modulated signal in the presence of another identically modulated co-channel interference (CCI) signal. We propose a joint MLSE algorithm that uses a dynamic channel description (J-MLSE/DCD). This algorithm deals with CCI more effectively while keeping the overall complexity low. Our approach is to adaptively truncate the channels of both the signal and the interference according to their individual power, thereby greatly reducing the complexity. Analytic BER lower bounds for the J-MLSE algorithms in the time-varying specular multipath Rayleigh-fading channels are derived. Simulation results for the GMSK signals used in the GSM system are presented.

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