Pilot-Aided IQ Imbalance Compensation for OFDM Systems Operating Over Doubly Selective Channels

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 an...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2011-05, Vol.59 (5), p.2223-2233
Main Authors: Lanlan He, Shaodan Ma, Yik-Chung Wu, Yiqing Zhou, Tung-Sang Ng, Poor, H Vincent
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Channel estimation
Channels
Compensation
Computer simulation
Convergence
Detection, estimation, filtering, equalization, prediction
doubly selective channel (DSC)
Exact sciences and technology
in-phase and quadrature-phase (IQ) imbalance
Information, signal and communications theory
intercarrier interference (ICI)
Iterative methods
Joints
Least squares method
Miscellaneous
Multiplexing
Noise
OFDM
Orthogonal Frequency Division Multiplexing
orthogonal frequency division multiplexing (OFDM)
Radio transmitters
Receivers
Signal and communications theory
Signal processing
Signal, noise
Telecommunications and information theory
Time domain analysis
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Summary: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.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2011.2112649