Pilot symbol aided soft-output demodulation of CPM signals in flat Rayleigh fading channels

Symbol-by-symbol detection algorithms are useful in systems in which soft-decision metrics are important, e.g., systems with interleaved coded modulation. A soft-output algorithm for the detection of continuous phase modulated (CPM) signals transmitted over frequency flat, Rayleigh fading channels is developed. Since the optimum detector is too computationally complex for any practical implementation, some sub-optimal detectors which give near optimal performance are proposed. The performance of the soft-output detector is demonstrated by simulations.