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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

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Citations:  Bibtex RefMan EndNote GB/T7714


Fang-lin Gu


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


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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%A Shan Wang
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T1 - Standard-independent I/Q imbalance estimation and compensation scheme in OFDM direct-conversion transceivers
A1 - Fang-lin Gu
A1 - Shan Wang
A1 - Wen-wu Wang
J0 - Frontiers of Information Technology & Electronic Engineering
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/FITEE.1700003

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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