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 journalArticlepeer-review

31 Scopus citations


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 languageEnglish (US)
Article number5710591
Pages (from-to)2223-2233
Number of pages11
JournalIEEE Transactions on Signal Processing
Issue number5
StatePublished - May 2011

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering


  • 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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