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Higher-Order Circularity based I/Q Imbalance Compensation in Direct-Conversion Receivers

Gu, Fanglin, Wang, Shan, Wei, Jibo and Wang, Wenwu (2017) Higher-Order Circularity based I/Q Imbalance Compensation in Direct-Conversion Receivers In: 84th Vehicular Technology Conference, 18 - 21 September 2016, Montreal, QC, Canada.

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In-phase and quadrature-phase (I/Q) imbalance is a critical issue limit the achievable operating signal-to-noise ratio (SNR) at the receiver in direct conversion architecture. In recent literatures, the second-and fourth-order circularity property of communication signals have been used for designing compensator to eliminate the I/Q imbalance. In this paper, we investigate whether moment circularity of an order higher than four can be used in receiver I/Q imbalance compensation. It is shown that the sixth-order moment E[z4z*2] is a suitable statistic for measuring the sixth-order circularity of representative communication signals such as M-QAM and M-PSK with M > 2. Two blind algorithms are then proposed to update the coefficients of I/Q imbalance compensator by restoring the sixth-order circularity of the compensator output signal. Simulation results show that the new proposed methods based on sixth-order statistic converges faster or gives lower steady-state variance than the reference methods that are based on second-and fourth-order statistics.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Gu, Fanglin
Wang, Shan
Wei, Jibo
Date : 20 March 2017
DOI : 10.1109/VTCFall.2016.7881033
Copyright Disclaimer : © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Depositing User : Melanie Hughes
Date Deposited : 20 Nov 2018 12:28
Last Modified : 20 Nov 2018 12:29

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