Spectral Efficiency and Relay Energy Efficiency of Full-Duplex Relay Channel
Spectral Efficiency and Relay Energy Efficiency of Full-Duplex Relay Channel
复制标题
DOI：
10.1109/twc.2017.2675886
复制
发表时间：
2017-05
影响因子：
10.4
通讯作者：
Zhengchuan Chen;Tony Q. S. Quek;Ying-Chang Liang
中科院分区：
文献类型：
--
作者：
Zhengchuan Chen;Tony Q. S. Quek;Ying-Chang Liang
全双工中继具有提高协作通信系统频谱效率的潜力。由于残余自干扰（RSI），增加中继功率并不总是有助于SE的改善。为了充分利用全双工中继在协作通信中，RSI上的SE实现不同的中继方案的效果需要进行调查。在本文中，我们研究了在存在RSI的情况下，解码转发（DF）中继，压缩转发（CF）中继和放大转发（AF）中继的全双工中继信道的SE上界。对于各自的计划，最佳中继功率和相应的最大SE推导出封闭形式。给出了不同方案下中继能量效率的界，为节点能量效率约束下的系统设计提供了依据。基于SE性能，详细阐述了采用全双工中继的条件、DF、CF和AF中继方案的选择标准以及采用混合全双工或半双工模式的条件。总之，本文研究了SE，REE和系统设计之间的关系，考虑到RSI的影响，一般类的合作计划。
Full-duplex relaying has the potential to improve the spectral efficiency (SE) of cooperative communication systems. Due to residual self-interference (RSI), increase of the relay power does not always contribute to SE improvement. To fully utilize full-duplex relaying in cooperative communications, the effect of RSI on the SE achieved by different relay schemes need to be investigated. In this paper, we study bounds on the SE of full-duplex relay channel with decode-forward (DF) relaying, compress-forward (CF) relaying, and amplify-forward (AF) relaying in the presence of RSI. For respective schemes, optimal relay power and the corresponding maximal SE are derived in closed-form. Bounds on the relay energy-efficiency (REE) are presented for different schemes, which are useful for system design under per-node energy efficiency constraint. Based on the SE performance, the conditions of employing full-duplex relay, criteria for selecting relay scheme among DF, CF, and AF schemes, and the conditions of adopting hybrid full-duplex or half-duplex mode are elaborated regarding to RSI strength. In summary, this paper investigates the relationship among SE, REE, and system design by taking into account the effect of RSI for a general class of cooperation schemes.