Power Allocation for Virtual MIMO-Based Three-Stage Relaying in Wireless Ad Hoc Networks
Power Allocation for Virtual MIMO-Based Three-Stage Relaying in Wireless Ad Hoc Networks
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DOI：
10.1109/twc.2014.2351410
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发表时间：
2014-08
影响因子：
10.4
通讯作者：
Lingya Liu;Cunqing Hua;Cailian Chen;X. Guan
中科院分区：
文献类型：
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作者：
Lingya Liu;Cunqing Hua;Cailian Chen;X. Guan
在传统的双跳协作通信中，与源或目的地的信道条件不平衡的中继可能成为整体协作的瓶颈。因此，本文提出了一种针对集群网络的三阶段中继（TSR）框架，通过将中继分为两组，将双跳协作扩展到三个阶段。两个组之间的长距离通信形成虚拟的多输入多输出（MIMO）链路，通过该链路可以消除中继和源（或目的地）之间的瓶颈。我们重点研究基于该框架的功率分配问题，目标是在总功率约束下最小化目的地的停电概率。为了解决计算复杂度，问题被分解为两个子问题，一个处理源和第一跳中继的功率分配，另一个处理第二跳中继的功率分配。我们通过利用每个子问题的特殊结构来设计算法，然后开发一个主程序来处理这些子问题的功率分配。通过仿真研究对所提出方案的性能进行了评估，结果表明，与双跳协作方案相比，TSR框架在中断概率方面取得了显着改善，并且功耗在中继之间分布更加公平。
In the conventional dual-hop cooperative communications, relays with imbalanced channel condition to the source or the destination may become the bottleneck of the overall cooperation. Therefore, in this paper, a Three-Stage Relaying (TSR) framework is proposed for clustered networks to extend the dual-hop cooperation to three stages by dividing relays into two groups. The long-haul communication between two groups form a virtual multi-input multi-output (MIMO) link with which the bottleneck between the relay and the source (or the destination) can be removed. We focus on the power allocation problem based on this framework, with the objective of minimizing the outage probability at the destination under the total power constraint. To address the computational complexity, the problem is decomposed into two subproblems, one deals with the power allocation of the source and the first-hop relays, the other deals with the power allocation of the second-hop relays. We design the algorithms for each subproblem by exploiting their special structure, and then develop a master procedure to handle the power allocation across these subproblems. The performance of the proposed scheme is evaluated through simulation study, which shows that the TSR framework achieves significant improvement on the outage probability compared with the dual-hop cooperation scheme, and the power consumption is more fairly distributed across relays.