Performance of digital communications over selective fading channels

The performance of digital communications over selective wide-sense-stationary uncorrelated-scattering (WSSUS) fading channels is investigated. The emphasis is on the evaluation of the performance of binary differential phase-shift keyed (DPSK) and binary frequency-shift keyed (FSK) communications with primary emphasis on the effects of intersymbol interference produced by the frequency-selective character of WSSUS fading channels. The error probabilities of DPSK and FSK are evaluated for several models of WSSUS frequency-selective fading channels. The analysis is focused on the performance evaluation of Rayleigh fading channels. The expressions for the probability of error for these systems are formulated in a way that allows the identification of the key parameters of the communication system. The performance of DPSK and FSK are evaluated for several signaling formats. The design parameters considered are the shapes of the basic data-pulse waveforms for both DPSK and FSK, the modulation index, and the relative phase between successive transmitted signals for FSK.