通信学报 ›› 2017, Vol. 38 ›› Issue (1): 141-148.doi: 10.11959/j.issn.1000-436x.2017016

• 学术论文 • 上一篇    下一篇

全双工终端的收发I/Q不平衡估计与补偿算法

吴皓威1,2,赵俊波2,徐浩然2,欧静兰2   

  1. 1 重庆大学通信与测控中心,重庆 400044
    2 重庆大学通信工程学院,重庆 400044
  • 修回日期:2016-12-12 出版日期:2017-01-01 发布日期:2017-01-23
  • 作者简介:吴皓威(1981-),男,湖北天门人,博士,重庆大学副研究员、硕士生导师,主要研究方向为无线局域网、宽带无线通信、飞行器测控等。|赵俊波(1991-),男,四川南充人,重庆大学硕士生,主要研究方向为全双工通信、网络安全等。|徐浩然(1991-),男,江苏张家港人,重庆大学硕士生,主要研究方向为无线局域网、飞行器测控等。|欧静兰(1981-),女,四川宜宾人,重庆大学副教授,主要研究方向为宽带无线通信、中继通信等。
  • 基金资助:
    国家高技术研究发展计划(“863”计划)基金资助项目(2015AA7072014C);重庆市院士基金资助项目(cstc2014yykfys90001);中央高校基本业务费基金资助项目(106112013CDJZR165502);中央高校基本业务费基金资助项目(CDJZR14100050)

Estimation and compensation for transmitter and receiver I/Q imbalance of full-duplex terminals

Hao-wei WU1,2,Jun-bo ZHAO2,Hao-ran XU2,Jing-lan OU2   

  1. 1 Centre of Communication and TTC,Chongqing University,Chongqing 400044,China
    2 College of Communication Engineering,Chongqing University,Chongqing 400044,China
  • Revised:2016-12-12 Online:2017-01-01 Published:2017-01-23
  • Supported by:
    The National High-Tech R&D Program (863 Program)(2015AA7072014C);Chongqing Academician Fund Project(cstc2014yykfys90001);Fundamental Research Funds for The Central Universities(106112013CDJZR165502);Fundamental Research Funds for The Central Universities(CDJZR14100050)

摘要:

针对直接变换收发结构的全双工通信终端中存在的I/Q不平衡问题,提出基于直接自干扰信号的收发I/Q不平衡参数估计与补偿算法。该算法无需外接标准的发射机或接收机进行参数估计,利用全双工结构中发射端泄露到接收端的直接自干扰信号,进行估计与分离,可分别获得收发I/Q不平衡参数,再进行发射前的预补偿和接收后的校正,使从外部来看该全双工终端的I/Q支路是平衡的,无需对其进行参数估计,从而降低整个系统信号处理的复杂度。仿真结果表明,所提算法不仅能够有效估计全双工终端的I/Q不平衡参数,还能对终端的收发I/Q不平衡分别进行补偿,从而提升系统整体性能。

关键词: 全双工, 自干扰信号, I/Q不平衡, 估计, 补偿

Abstract:

In order to reduce I/Q imbalance of the full-duplex terminal with direct-conversion transceiver,an algorithm based on self-interference signal was proposed for the estimation and compensation of I/Q imbalance in both transmitter (Tx) and receiver (Rx).Without the perfect transmitter or receiver for I/Q imbalance estimation,the self-interference signal from Tx chain to Rx chain was used for parameter estimation and separation,and the Tx and Rx I/Q imbalance parameters were obtained,respectively.Then the pre-compensation before transmission and the correction after receiving was processed,so that there was nearly no I/Q imbalance in this full-duplex terminal from the view of the other terminals,and the complexity of the signal processing will be reduced as a result of the absent of the I/Q imbalance estimation.The simulation results show that the proposed algorithm can effectively estimate and compensate the I/Q imbalance of the full-duplex Tx & Rx terminal,and improve the overall signal quality and the system performance.

Key words: full-duplex, self-interference signal, I/Q imbalance, estimation, compensation

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