基于OSS-RS系统的中继选择和功率分配策略

The strategy of relay selection and power allocation based on the OSS-RS system

为了提高系统的可达速率和,降低系统的中断概率,本文提出了一种联合机会源选择(OSS)和中继选择(RS)的OSS-RS系统。在最大化可达速率和的基础上,提出了最大化瞬时信噪比(Maximize the instantaneoussignal-to-noise ratio,MISNR)的中继选择策略。在等功率分配条件下,提出了基于AF的OSS-RS系统的最大化信道增益的调和平均值(Maximize Harmonic Average,MHA)的中继选择策略。进一步,在最大化瞬时信噪比的基础上提出了一种最优功率分配方案。理论分析和仿真结果均表明,本文提出的中继选择和功率分配策略提高了系统的可达速率和,降低了系统的中断概率,改善了系统的性能。

In order to improve the achievable sum-rate and decrease the outage probability of the system, this paper proposes the OSS-RS system which joints the technology of opportunistic source selection （OSS） and relay selection （RS）. Under the basis of maximizing the achievable sum-rate in the OSS-RS system, a relay selection of maximized instantaneous signal-to-noise ratio （MISNR） is proposed. When power is equally allocated, a strategy of maximized harmonic average （MHA） of the channel gains based on amplify-and-forward （AF） in the OSS-RS system for relay selection is proposed. The optimal power allocation scheme between the sources and the relay is proposed based on MISNR. The theoretical analysis and simulation results show that the proposed relay selection and power allocation strategy can effectively increase the achievable sum-rate, decrease the outage probability and improve the performance of the system.