Joint antenna diversity and combined soft output MAP equalization/decoding of TCM on frequency-selective fading mobile radio channels

A Monte Carlo simulation study of a combined FDMA/TDMA slow frequency-hopping trellis coded adaptive receiver for frequency-selective multipath Rayleigh fading mobile radio channels is presented. The receiver structure comprises state-dependent decision feedback MLSE soft-output MAP equalizer, block deinterleaver and TCM decoder in one unit. Antenna diversity is considered leading to a joint diversity and combined equalization/decoding scheme. Furthermore, cyclic slow frequency hopping is used to attain intrinsic frequency diversity to perform a near ideal channel interleaving with a short processing delay. The dynamic behavior of the mobile radio channel has been simulated by means of a selective equal-energy two-ray Rayleigh model, with a variable delay, τ, between the two rays. The bit error rate (BER) is obtained as a function of the signal-to-noise ratio (SNR) and with τ, Doppler spread, number of frequencies in the frequency-hopping pattern, number of states considered by the state-dependent decision feedback algorithm and the TDMA frame length as parameters