Standard-independent I/Q imbalance estimation and compensation scheme in OFDM direct-conversion transceivers

Fang-lin GU; Shan WANG; Wen-wu WANG

doi:10.1631/FITEE.1700003

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Standard-independent I/Q imbalance estimation and compensation scheme in OFDM direct-conversion transceivers

Special Feature on 5G Wireless Communication Systems and Technologies | Updated：2022-05-19

- Standard-independent I/Q imbalance estimation and compensation scheme in OFDM direct-conversion transceivers
- OFDM直接变频接收机中通用的I/Q不平衡估计与补偿方法
- Frontiers of Information Technology & Electronic Engineering Vol. 19, Issue 3, Pages: 388-397(2018)
- Affiliations：
  
  College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
  Department of Electronic Engineering, University of Surrey, Guildford GU2 7XH, UK
- Author bio：
  
  Fang-lin GU, E-mail: gu.fanglin@nudt.edu.cn
  [ "Shan WANG, E-mail: chinafir@nudt.edu.cn" ]
  [ "Wen-wu WANG, E-mail: w.wang@surrey.ac.uk" ]
- Funds：
- DOI：10.1631/FITEE.1700003
  CLC： TN92
- Received：03 January 2017，
  
  Revised：2018-;3-;5，
  
  Published：2018-03
- Accepted：
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Fang-lin GU, Shan WANG, Wen-wu WANG. Standard-independent I/Q imbalance estimation and compensation scheme in OFDM direct-conversion transceivers[J]. Frontiers of Information Technology & Electronic Engineering, 2018, 19(3): 388-397.
DOI：

Fang-lin GU, Shan WANG, Wen-wu WANG. Standard-independent I/Q imbalance estimation and compensation scheme in OFDM direct-conversion transceivers[J]. Frontiers of Information Technology & Electronic Engineering, 2018, 19(3): 388-397. DOI： 10.1631/FITEE.1700003.

摘要

直接变频接收机由于具有低功耗的特点，受到广泛关注，但是它存在较严重的同相/正交（I/Q）分量不平衡问题：I/Q不平衡会恶化接收信号的信噪比，进而影响系统的传输容量和能够支持的调制方式。本文首先分析了I/Q不平衡对OFDM接收机接收信号的影响，在此基础上，定义了一个统计量用于刻画OFDM系统的I/Q不平衡特性，并提出一种实现I/Q不平衡参数估计与补偿的方法。特别地，进一步证明该统计量不受传输信道影响，因而该方法适用于高斯白噪声和多径衰落信道等不同场景。仿真结果表明，该方法可以实现对OFDM系统I/Q不平衡的准确估计与补偿，使补偿后系统的误比特率性能接近于不存在I/Q不平衡的情形。更重要的是，由于该方法不依赖于导频信号，因而可以应用于采用不同标准的OFDM系统。

Abstract

Direct-conversion transceivers are gaining increasing attention due to their low power consumption. However

they suffer from a serious in- and quadrature-phase (I/Q) imbalance problem. The I/Q imbalance can severely limit the achievable operating signal-to-noise ratio (SNR) at the receiver and

consequently

the supported constellation sizes and data rates. In this paper

we first investigate the effects of I/Q imbalance on orthogonal frequency division multiplexing (OFDM) receivers

and then propose a new I/Q imbalance compensation scheme. In the proposed method

a new statistic

which is robust against channel distortion

is used to estimate the I/Q imbalance parameters

and then the I/Q imbalance is corrected in the frequency domain. Simulations are performed to verify the effectiveness of the proposed method for I/Q imbalance compensation. The results show that the proposed I/Q imbalance compensation method can achieve bit error rate (BER) performance close to that in the ideal case without I/Q imbalance in additive white Gaussian noise (AWGN) or multipath environments. Furthermore

because no pilot information is required

this method can be applied in various standard communication systems.

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