基于比例公平选择的中继通信策略

针对机会协作通信中各个中继具有不同的选择概率,选择的不公平性导致网络寿命变短的问题,提出了一种比例公平的中继选择方法。该方法以改善系统的平均公平性和延长网络寿命为目标,选择瞬时信噪比和平均信噪比比值最大的中继作为协作中继,在满足系统服务质量要求的条件下,让那些具有低平均值同时具有较高瞬时信道条件的中继尽可能地帮助源节点转发信息。仿真结果表明,该方法与传统的机会中继选择方法相比,其中断性能虽约有下降,但改善了系统的平均公平性和网络寿命。

Relay Selection Method Based on Proportional Fairness

The relays of opportunistic cooperative communication have different choice probabilities. Aiming at the problem of the unfair selection causes the reducing of network lifetime, a relay selection method based on proportional fairness is presented in this paper. This method is due to improve the average fairness and prolong the network lifetime. The relay which has the highest ratio in both instantaneous and average signal-to-noise is to be chosen as the cooperative relay. Under the quality requirement of system service, the main idea of the proposed scheme is that some relays with good instantaneous and low average channel condition may have more chance to forward the source signal. The simulation shows that, although the outage probability based on this relay selection method is reduced, the average fairness and the network lifetime are improved.