A model-based approach to demodulation of co-channel MSK signals

In this paper, we present model-based techniques for joint detection of two near equal power co-channel MSK signals. It is shown that an MSK signal is piecewise linear in the parameters of interest and therefore can be represented in the standard linear form. The problem of joint detection is then reduced to one of parameter estimation and this allows us to develop receiver architectures based on the minimum variance and minimum mean square error criterion. Simulation results have shown that model-based techniques provide a performance gain of about 12 dB for equal power signals and about 8-10 dB when the signals are near equal power (SIR∼1dB) over the conventional correlation receiver.