一种基于ARQ的最优中继动态选择协作方法

摘要

In cooperative networks with automatic repeat request (ARQ), the multiple-rounds retransmission is used to improve the reliability at the cost of additional delay. In this paper, a cross-layer cooperative strategy is investigated in ARQ cooperative networks for the case that relay nodes do not have ability of signal combining reception. A selection cooperation scheme is proposed, in which both the decoding set and the selection of best relay are changed dynamically during each round of retransmission. In Rayleigh fading channels, the proposed scheme can achieve optimal diversity-multiplexing-delay (D-M-D) tradeoff without increasing the receiver complexity of relay nodes. Simulation results show that the outage probability performance of the proposed scheme is close to that of the scheme using combining reception at relay nodes. It achieves better tradeoff between the receiver complexity and the system performance.%在以多轮重传增加时延为代价提高可靠性的自动重传请求(ARQ)协作网络中,对中继节点无信号合并接收能力时的跨层协作策略进行了研究,提出了一种在ARQ重传过程中系统解码集和最优中继选择动态改变的选择协作方法.在Rayleigh衰落信道环境中,该方法能够在不增加中继节点接收机复杂度的情况下取得最优分集-复用-时延(D-M-D)权衡.仿真结果表明,该方法的系统中断概率性能与中继节点具备信号合并接收能力方案的中断概率性能接近,能够在接收机复杂度和系统性能之间取得较好的权衡.