Relay Selection for Three-Stage Relaying Scheme in Clustered Wireless Networks
Relay Selection for Three-Stage Relaying Scheme in Clustered Wireless Networks
复制标题
集群无线网络中三级中继方案的中继选择
DOI：
10.1109/tvt.2014.2342717
复制
发表时间：
2015-06-01
影响因子：
6.8
通讯作者：
Guan, Xinping
中科院分区：
文献类型：
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作者：
Liu, Lingya;Hua, Cunqing;Guan, Xinping
对于分簇无线网络，传统的双跳协作技术是低效的，因为中继与源和目的地的信道不平衡可能成为整体传输的瓶颈。在本文中，一种新的合作框架称为三阶段中继（TSR）计划，提出了解决这个问题。在TSR中，中继被分成两个簇/组，并通过引入两个中继组之间的传输来形成虚拟多输入多输出（MIMO）天线阵列。这种“中继到中继”的通信使得能够在更短的距离上进行传输，这自然打破了双跳合作方案中出现的瓶颈。一个优化问题，制定处理这两个组的中继选择，旨在最大限度地提高接收到的信号噪声比（SNR）在目的地，中继的数量约束。这个问题原来是不平凡的，由于两组之间的继电器的耦合。我们解决这个具有挑战性的问题分解成两个子问题：一个处理与选择发送中继，和其他处理与选择接收中继。然后，我们提出了两个启发式算法，实现的最优解和计算复杂性之间的权衡。通过大量的数值模拟，我们显示了优越的TSR的双跳合作计划在集群和集中的无线网络中的误符号率和吞吐量。
For clustered wireless networks, the conventional dual-hop cooperation technique is inefficient since relays with imbalanced channels to the source and the destination may become the bottleneck of the overall transmission. In this paper, a novel cooperative framework called the three-stage relaying (TSR) scheme is proposed to address this problem. In TSR, relays are divided into two clusters/groups, and a virtual multiple-input-multiple-output (MIMO) antenna array is formed by introducing the transmission between the two relay groups. This “relay-to-relay” communication enables transmissions over shorter distances, which naturally breaks the bottleneck emerging in the dual-hop cooperation scheme. An optimization problem is formulated to deal with the relay selection for these two groups, aiming at maximizing the received signal-to-noise ratio (SNR) at the destination, subject to the number-of-relay constraint. This problem turns out to be nontrivial due to the coupling of the relays between two groups. We tackle this challenging problem by decomposing it into two subproblems: One deals with the selection of transmitting relays, and the other deals with the selection of receiving relays. We then propose two heuristic algorithms that achieve the tradeoff between the optimality of the solution and the computational complexity. Through extensive numerical simulations, we show the superiority of TSR over the dual-hop cooperation schemes in both the clustered and centered wireless networks in terms of symbol error rate and throughput.