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CLC number: TN92

On-line Access: 2018-05-07

Received: 2017-01-03

Revision Accepted: 2017-03-06

Crosschecked: 2018-03-05

Cited: 0

Clicked: 1387

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Fang-lin Gu

http://orcid.org/0000-0001-9194-280X

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Frontiers of Information Technology & Electronic Engineering  2018 Vol.19 No.3 P.388-397

10.1631/FITEE.1700003


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


Author(s):  Fang-lin Gu, Shan Wang, Wen-wu Wang

Affiliation(s):  College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China; more

Corresponding email(s):   gu.fanglin@nudt.edu.cn, chinafir@nudt.edu.cn, w.wang@surrey.ac.uk

Key Words:  In- and quadrature-phase (I/Q) imbalance, Orthogonal frequency division multiplexing (OFDM), Standard-independent


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.

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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.

OFDM直接变频接收机中通用的I/Q不平衡估计与补偿方法

概要: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。

关键词:同相/正交分量不平衡;正交频分复用;标准独立

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