Performance analysis and power allocation for decode-and-forward cooperative communications over Rician fading channel

摘要

This paper derives the asymptotic symbol error rate (SER) and outage probability of decode-and-forward (DF) cooperative communications over Rician fading channels. How to optimally allocate the total power is also addressed when the performance metric in terms of SER or outage probability is taken into consideration. Analysis reveals the insights that Rician factor has a great impact on the system performance as compared with the channel variance, and the relay-destination channel quality is of importance. In addition, the source-relay channel condition is irrelevant to the optimal power allocation design. Simulation and numerical evaluation substantiate the tightness of the asymptotic expressions in the high-SNR regions and demonstrate the accuracy of our theoretical analysis.