Pilot-aided IQ imbalance compensation for OFDM systems operating over doubly selective channels

Lanlan He; Shaodan Ma; Yik Chung Wu; Yiqing Zhou; Tung Sang Ng; H. Vincent Poor

doi:10.1109/TSP.2011.2112649

Pilot-aided IQ imbalance compensation for OFDM systems operating over doubly selective channels

Lanlan He, Shaodan Ma, Yik Chung Wu, Yiqing Zhou, Tung Sang Ng, H. Vincent Poor

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

In this paper, pilot-aided in-phase and quadrature-phase (IQ) imbalance compensation for orthogonal frequency division multiplexing (OFDM) systems operating over doubly selective channels is addressed. Based on a reformulated system model and the least squares (LS) criterion, a joint IQ imbalance and channel estimation method is developed, and the corresponding compensation scheme is also proposed. Moreover, to further enhance the compensation performance, an iterative compensation algorithm is derived via an expectation-maximization (EM) algorithm. Simulation results show that the iterative compensation algorithm initialized by the proposed LS compensation scheme converges in a few iterations and its performance after convergence is close to the ideal case with perfect IQ imbalance and channel state information.

Original language	English (US)
Article number	5710591
Pages (from-to)	2223-2233
Number of pages	11
Journal	IEEE Transactions on Signal Processing
Volume	59
Issue number	5
DOIs	https://doi.org/10.1109/TSP.2011.2112649
State	Published - May 2011

All Science Journal Classification (ASJC) codes

Signal Processing
Electrical and Electronic Engineering

Keywords

Channel estimation
doubly selective channel (DSC)
in-phase and quadrature-phase (IQ) imbalance
intercarrier interference (ICI)
orthogonal frequency division multiplexing (OFDM)

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10.1109/TSP.2011.2112649

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title = "Pilot-aided IQ imbalance compensation for OFDM systems operating over doubly selective channels",

abstract = "In this paper, pilot-aided in-phase and quadrature-phase (IQ) imbalance compensation for orthogonal frequency division multiplexing (OFDM) systems operating over doubly selective channels is addressed. Based on a reformulated system model and the least squares (LS) criterion, a joint IQ imbalance and channel estimation method is developed, and the corresponding compensation scheme is also proposed. Moreover, to further enhance the compensation performance, an iterative compensation algorithm is derived via an expectation-maximization (EM) algorithm. Simulation results show that the iterative compensation algorithm initialized by the proposed LS compensation scheme converges in a few iterations and its performance after convergence is close to the ideal case with perfect IQ imbalance and channel state information.",

keywords = "Channel estimation, doubly selective channel (DSC), in-phase and quadrature-phase (IQ) imbalance, intercarrier interference (ICI), orthogonal frequency division multiplexing (OFDM)",

author = "Lanlan He and Shaodan Ma and Wu, {Yik Chung} and Yiqing Zhou and Ng, {Tung Sang} and Poor, {H. Vincent}",

note = "Funding Information: Manuscript received May 05, 2010; revised August 17, 2010, January 20, 2011; accepted January 20, 2011. Date of publication February 10, 2011; date of current version April 13, 2011. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Shengli Zhou. This work was supported in part by the General Research Fund (GRF) from Hong Kong Research Grant Council (Project No.: HKU 7154/08E), by the HKU Seed Funding Programme (Project No.: 200811159094), and by theU.S. National Science Foundation by Grant CNS-09-05398.",

year = "2011",

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language = "English (US)",

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T1 - Pilot-aided IQ imbalance compensation for OFDM systems operating over doubly selective channels

AU - He, Lanlan

AU - Ma, Shaodan

AU - Wu, Yik Chung

AU - Zhou, Yiqing

AU - Ng, Tung Sang

AU - Poor, H. Vincent

N1 - Funding Information: Manuscript received May 05, 2010; revised August 17, 2010, January 20, 2011; accepted January 20, 2011. Date of publication February 10, 2011; date of current version April 13, 2011. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Shengli Zhou. This work was supported in part by the General Research Fund (GRF) from Hong Kong Research Grant Council (Project No.: HKU 7154/08E), by the HKU Seed Funding Programme (Project No.: 200811159094), and by theU.S. National Science Foundation by Grant CNS-09-05398.

PY - 2011/5

Y1 - 2011/5

N2 - In this paper, pilot-aided in-phase and quadrature-phase (IQ) imbalance compensation for orthogonal frequency division multiplexing (OFDM) systems operating over doubly selective channels is addressed. Based on a reformulated system model and the least squares (LS) criterion, a joint IQ imbalance and channel estimation method is developed, and the corresponding compensation scheme is also proposed. Moreover, to further enhance the compensation performance, an iterative compensation algorithm is derived via an expectation-maximization (EM) algorithm. Simulation results show that the iterative compensation algorithm initialized by the proposed LS compensation scheme converges in a few iterations and its performance after convergence is close to the ideal case with perfect IQ imbalance and channel state information.

AB - In this paper, pilot-aided in-phase and quadrature-phase (IQ) imbalance compensation for orthogonal frequency division multiplexing (OFDM) systems operating over doubly selective channels is addressed. Based on a reformulated system model and the least squares (LS) criterion, a joint IQ imbalance and channel estimation method is developed, and the corresponding compensation scheme is also proposed. Moreover, to further enhance the compensation performance, an iterative compensation algorithm is derived via an expectation-maximization (EM) algorithm. Simulation results show that the iterative compensation algorithm initialized by the proposed LS compensation scheme converges in a few iterations and its performance after convergence is close to the ideal case with perfect IQ imbalance and channel state information.

KW - Channel estimation

KW - doubly selective channel (DSC)

KW - in-phase and quadrature-phase (IQ) imbalance

KW - intercarrier interference (ICI)

KW - orthogonal frequency division multiplexing (OFDM)

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Pilot-aided IQ imbalance compensation for OFDM systems operating over doubly selective channels

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