Two-Way Relaying over OFDM: Optimized Tone Permutation and Power Allocation
Two-Way Relaying over OFDM: Optimized Tone Permutation and Power Allocation
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DOI：
10.1109/icc.2008.734
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发表时间：
2008-05
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影响因子：
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通讯作者：
Chin Keong Ho;Rui Zhang;Ying-Chang Liang
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文献类型：
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作者：
Chin Keong Ho;Rui Zhang;Ying-Chang Liang
我们考虑采用 OFDM 双向中继的放大转发方案，其中两个节点希望通过中继交换信息。假设完整的信道知识，我们对中继和两个信息交换节点进行功率分配，以及中继处的音调排列，以便最大化总容量。采用对偶分解技术进行功率分配，同时提出贪婪方法进行音调排列。特别是，我们探索了这种功率分配解决方案所表现出的有趣的注水行为。数值结果表明，通过单独或连续实施所提出的两种解决方案，可以实现显着的容量增益。
We consider an amplify-and-forward scheme for two-way relaying over OFDM, in which two nodes wish to exchange information via a relay. Assuming full channel knowledge, we perform power allocation for the relay and both information-exchanging nodes, as well as tone permutation at the relay, so as to maximize the sum capacity. A dual decomposition technique is employed for power allocation, while a greedy approach is proposed for tone permutation. In particular, we explore an interesting water-filling behavior displayed by this power allocation solution. Numerical results demonstrate that substantial capacity gains are achieved by implementing the two proposed solutions, either individually or successively.