Cooperative Diversity Using Optimal Relay Power Control for Different Fading Channels

摘要

In this paper, we study the performance of a wireless communication system, where an arbitrary number of relays cooperate to enhance the signal between source and destination. The source and destination are hidden from each other, and there is no direct link between them. Optimal Relay Power Control (ORPC) is introduced as an effective scheme to achieve cooperative diversity, where there is a trade-off between complexity and system performance. This paper develops a new and more accurate model for the ORPC scheme and takes into account the effects of fading and thermal noise at both the relays and destination. This leads to the derivation of new analytical expressions for the overall spectral efficiency which can be used to estimate the throughput of the ORPC in Rayleigh and Nakagamim fading channels, and to study the impact of different system parameters on efficiency. The accuracy of the new mathematical results is confirmed by Monte Carlo simulation. The results of this paper can be used to estimate the aggregate throughput of a dual-hop system employing the ORPC protocols