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Unified analysis of ergodic capacity of cooperative non-regenerative relaying with adaptive source transmission policies

Tight bounds for the ergodic capacity of amplify-and-forward cooperative diversity networks are derived for three different adaptive source transmission policies in a myriad of fading environments: (i) constant power with optimal rate adaptation (ORA); (ii) optimal joint power and rate adaptation (OPRA); and (iii) fixed rate with truncated channel inversion (TCIFR). Our unified framework based on the moment-generating function (MGF) approach allows us to gain insights as to how fade distributions and dissimilar fading statistics across the distinct communication links will affect the mean achievable rates, without imposing any restrictions on the fading parameters.