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

Hao-wei WU; Jun-bo ZHAO; Hao-ran XU; Jing-lan OU

doi:10.11959/j.issn.1000-436x.2017016

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

Papers | 更新时间：2024-06-05

- Estimation and compensation for transmitter and receiver I/Q imbalance of full-duplex terminals
- Journal on Communications Vol. 38, Issue 1, Pages: 141-148(2017)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  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)
- DOI：10.11959/j.issn.1000-436x.2017016
  CLC： TN929.5
- Online First：2017-01，
  
  Published：25 January 2017
- 稿件说明：
移动端阅览
Hao-wei WU, Jun-bo ZHAO, Hao-ran XU, et al. Estimation and compensation for transmitter and receiver I/Q imbalance of full-duplex terminals[J]. Journal on Communications, 2017, 38(1): 141-148.
DOI：

Hao-wei WU, Jun-bo ZHAO, Hao-ran XU, et al. Estimation and compensation for transmitter and receiver I/Q imbalance of full-duplex terminals[J]. Journal on Communications, 2017, 38(1): 141-148. DOI： 10.11959/j.issn.1000-436x.2017016.

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。

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.

关键词

Keywords

references

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