Non-coherent detection for orthogonal space-time coded CPM systems

A non-coherent detection algorithm was proposed for orthogonal space-time coded multi-level continuous phase modulation (OST-MCPM) transmission systems of two transmit antennas, using a non-coherent maximum likelihood (ML) approach with different lengths of watch window. The noncoherent detection algorithm is suitable for any number of receive antennas and the receiver does not need to estimate the channel state information. Two suboptimal detectors of reduced complexity could be obtained through approximation and decision feedback. Simulation results show that the bit error rate (BER) performance degradation is very small compared with that of the coherent maximum likelihood sequence estimation (MLSE) algorithm over quasi-static flat Rayleigh fading channels and the performance is also satisfying when the watch window length is small enough over fast Rayleigh fading channels.