存在I/Q不平衡的OFDM全双工双向译码转发中继系统及其性能分析

吴皓威; 赵俊波; 文格; 欧静兰

doi:10.11999/JEIT160545

存在I/Q不平衡的OFDM全双工双向译码转发中继系统及其性能分析

doi: 10.11999/JEIT160545

1.
(重庆大学飞行器测控与通信教育部重点实验室重庆 400044) ②(重庆大学通信工程学院重庆 400044)

基金项目:

国家863计划项目(2015AA7072014C)，重庆市院士基金项目(cstc2014yykfys90001)，中央高校基本业务费项目(106112013CDJZR165502, CDJZR14100050)

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出版历程
- 收稿日期: 2016-05-28
- 修回日期: 2016-09-30
- 刊出日期: 2017-03-19

OFDM Full-duplex Bidirectional DF Relaying System with I/Q Imbalance and Performance Analysis

1.
(Key Laboratory of Aerocraft Tracking Telemetering &
2.
(College of Communication Engineering, Chongqing University, Chongqing 400044, China)

Funds:

The National 863 Program of China (2015AA 7072014C), The Chongqing Academician Fund Project (cstc2014 yykfys90001), The Fundamental Research Funds for the Central Universities (106112013CDJZR165502, CDJZR14100050)

摘要

摘要: 全双工技术可以使频谱利用率翻倍，是5 G系统的关键技术之一。采用直接变换结构的全双工系统中残余自干扰(Residual Self-Interference, RSI)和同相/正交(In-phase/Quadrature, I/Q)不平衡是限制系统性能的两大主要因素。该文针对存在I/Q不平衡的OFDM全双工双向中继系统，建立了译码转发中继模式下的全双工系统信号模型，分析了瑞利衰落信道下系统的中断性能，获得了系统中断概率的闭式表达式。仿真结果不仅验证了理论分析的正确性，还得到结论：随着I/Q不平衡程度和残余自干扰强度的降低，系统中断性能将得到改善；只有沿着最速下降路线降低I/Q不平衡或中继节点RSI，才能实现最优的性能提升；通过系统I/Q不平衡与RSI参数所在的坐标点和最速下降路线的相对位置关系，来确定改善全双工双向中继系统中断性能的最优措施。
- 全双工 /
- 双向中继 /
- I/Q不平衡 /
- 中断概率
Abstract: The full-duplex transmission is one of the key technologies in the 5 G communication systems, due to the ability of improving spectrum efficiency. However, the performance of the full-duplex system, with the zero intermediate frequency structure, is badly impacted by the Residual Self-Interference (RSI) and In-phase/ Quadrature (I/Q) imbalance. In this paper, the OFDM full-duplex bidirectional relaying system under the RSI and I/Q Imbalance (IQI) is investigated, in a cooperative scenario where the Decode-and-Forward (DF) protocol is considered. The outage performance of the system and its closed-form expressions are derived under Rayleigh fading channels, and the influences of the IQI and RSI on system performances are analyzed, respectively. The simulation results verify the analysis, and the conclusions are given as follows. First, the outage performance improves as decreasing of the IQI and RSI. Second, the optimal improvement of outage performance is achieved by reducing the RSI and I/Q imbalance, according the route with the steepest descent method. Third, the best way for enhancing the outage performance is chosen, by the relative position between the steepest descent route and the current coordinate of IQI-RSI.
- Full-duplex /
- Bidirectional relaying /
- In-phase/Quadrature (I/Q) imbalance /
- Outage probability

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参考文献(17)

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