Low-Complexity Energy-Efficient Power and Subcarrier Allocation in Cooperative Networks
Low-Complexity Energy-Efficient Power and Subcarrier Allocation in Cooperative Networks
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DOI：
10.1109/lcomm.2013.082613.131487
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发表时间：
2013-08
期刊：
影响因子：
--
通讯作者：
Yuning Wang;Jianhua Zhang;Ping Zhang
中科院分区：
文献类型：
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作者：
Yuning Wang;Jianhua Zhang;Ping Zhang
本文研究了下行多用户OFDM协作网络中的联合子载波和功率分配问题。最大化每用户时间平均比特每焦耳的对数之和。将优化问题分解为两个子问题。首先，考虑比例公平性的子载波分配的解决方案。其次，在频率选择性衰落信道下，提出了一种在源节点和中继节点分别具有发射功率约束的交替功率分配（PA）方案。然后分析了该方案的复杂度。最后，数值计算结果给出了该方案的收敛性，能量效率和中断概率性能。
This letter addresses the joint subcarrier and power allocation problem in downlink multiuser OFDM cooperative networks. The sum of the logarithmic per user time-averaged bits-per-Joule is maximized. The optimization problem is decomposed into two subproblems. First, the solution for the subcarrier allocation considering the proportional fairness is obtained. Second, an alternating power allocation (PA) scheme with separate transmit power constraints at the source and relays is derived under frequency selective fading channels. Then the complexity of the proposed scheme is analyzed. Finally, numerical results present the convergence, energy efficiency and outage probability performance of the proposed scheme.