期刊名称：International Journal of Wireless & Mobile Networks
印刷版ISSN：0975-4679
电子版ISSN：0975-3834
出版年度：2012
卷号：4
期号：1
出版社：Academy & Industry Research Collaboration Center (AIRCC)
摘要：This article investigates the efficacy of a novel moment generating function (MGF) based analytical framework for calculating the ergodic channel capacities of cooperative dual-hop amplify-and-forward (CAF) relay networks under three distinct source-adaptive transmission policies in Rice and Nakagami- m fading environments. The proposed analytical approach relies on a new exponential-type integral representation for the logarithmic function 1 2 2 0 ln ( ) ( ) , 0, x x x e e dx γ γ γ ∞ − − − = − > ∫ that facilitates the task of averaging it over the probability density function (PDF) of end-to-end signal-to-noise ratio (SNR) in a myriad of stochastic fading environments. We also resort to a well-known bounding technique to derive closed-form formulas for the upper and lower bounds for the MGF of dual-hop CAF relayed path SNR in Rice and Nakagami-m channels (since exact evaluation of the MGF of half-harmonic mean SNR in Rice fading is known to be very complicated and numerically unstable). These two attributes dramatically reduces the computational complexity of evaluating the ergodic capacities of CAF multi-relay networks with the optimal joint power-and-rate adaptation (when the channel side information is available at both the transmitter and the receiver) and the optimal rate-adaptation with a constant transmit power (when channel side information is available at the receiver only) policies.
