Modem Pameter optimization via the Generalized Cut-off rate of Time- and Frequency- Selective Fading Channels

The generalized cut-off rate of time- and frequency-selective fading channels is used to the optimal signalling rate and code rate. Two modulation types, M-ary frequency shift keying (MFSK) and M-ary differential phase shift keying (MDPSK) with soft decoding are investigated as well as three dispersive channels. The guard time effect, employed to combat multipath, is evaluated for frequency-selective channels and the optimal combination of signalling rate, code rate and guard time is presented. Special attention is given to CCIR (International Radio Consultative Committee) HF channel models.