Buffer-Aided Relay Selection for Cooperative Diversity Systems without Delay Constraints
Buffer-Aided Relay Selection for Cooperative Diversity Systems without Delay Constraints
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DOI：
10.1109/twc.2012.032712.111970
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发表时间：
2012-05-01
影响因子：
10.4
通讯作者：
Thompson, John S.
中科院分区：
文献类型：
--
作者：
Krikidis, Ioannis;Charalambous, Themistoklis;Thompson, John S.
本文研究了有限缓冲区辅助解码转发协作无线网络中的中继选择问题。中继选择策略，充分利用中继节点的缓冲能力，以最大限度地实现分集增益提供的灵活性进行了研究。这种新方案结合了无线链路的瞬时强度以及有限中继缓冲区的状态，并通过在中继接收和发送之间动态切换来适应最强可用链路上的中继选择决策。为了分析新的中继选择策略的中断概率和分集增益，一个理论框架，模型的中继缓冲区的演变为马尔可夫链（MC）的介绍。研究了MC的状态转移矩阵和相关稳态的构造及其对中断概率推导的影响。我们表明，建议的中继选择方案显着优于传统的中继选择政策的所有情况下，并确保分集增益等于两倍的中继大缓冲区大小的数量。
In this paper, we study the relay selection problem for a finite buffer-aided decode-and-forward cooperative wireless network. A relay selection policy that fully exploits the flexibility offered by the buffering ability of the relay nodes in order to maximize the achieved diversity gain is investigated. This new scheme incorporates the instantaneous strength of the wireless links as well as the status of the finite relay buffers and adapts the relay selection decision on the strongest available link by dynamically switching between relay reception and transmission. In order to analyse the new relay selection policy in terms of outage probability and diversity gain, a theoretical framework that models the evolution of the relay buffers as a Markov chain (MC) is introduced. The construction of the state transition matrix and the related steady state of the MC are studied and their impact on the derivation of the outage probability is investigated. We show that the proposed relay selection scheme significantly outperforms conventional relay selection policies for all cases and ensures a diversity gain equal to two times the number of relays for large buffer sizes.