This paper studies the performance and key structural properties of the optimum location-based relay selection policy for wireless networks consisting of homogeneous Poisson distributed relays. The distribution of the channel quality indicator at the optimum relay location is obtained. A threshold-based distributed selective feedback policy is proposed for the discovery of the optimum relay location with finite average feedback load. It is established that the total number of relays feeding back obeys to a Poisson distribution and an analytical expression for the average feedback load is derived. The analytical expressions for the average rate and outage probability with and without selective feedback are also obtained for general path-loss models. It is shown that the optimum location-based relay selection policy outperforms other common relay selection strategies notably. It is also shown that utilizing location information from a small number of relays is enough to achieve almost the same performance with the infinite feedback load case. As generalizations, full-duplex relays, isotropic Poisson point processes, and heterogeneous source-to-relay and relay-to-destination links are also studied.
翻译:本文研究无线网络的最佳定位中继器选择政策(由同质分布式Poisson分布式中继器组成)的性能和关键结构特性。获得了最佳中继器质量指标在最佳中继器位置的分布。为发现最佳中继器位置,提出了基于门槛的分布式选择性反馈政策,其平均反馈负载有限。确定回馈的中继器总数符合Poisson分布法,并对平均反馈负载进行分析表达。一般路径损失模型也获得了平均速度和超速概率的分析表达,一般路径损失模型和不提供选择性反馈的偏差概率也得到了分析表达。显示,基于最佳地点的中继器选择政策明显优于其他通用中继器选择战略。还表明,利用少数中继器的定位信息足以在无限反馈负载的情况下实现几乎相同的性能。还研究了一般化、全多式中继器、异式波森点进程,以及多种源到中继和中继至评估连接。