XU Peng, WANG Jinkuan, QI Feng, SONG Xin. An Enhanced EM/SAGE-based H-infinity Channel Estimator for MIMO-OFDM Systems[J]. Chinese Journal of Electronics, 2011, 20(4): 708-712.
Citation: XU Peng, WANG Jinkuan, QI Feng, SONG Xin. An Enhanced EM/SAGE-based H-infinity Channel Estimator for MIMO-OFDM Systems[J]. Chinese Journal of Electronics, 2011, 20(4): 708-712.

An Enhanced EM/SAGE-based H-infinity Channel Estimator for MIMO-OFDM Systems

  • Received Date: 2010-09-01
  • Rev Recd Date: 2011-02-01
  • Publish Date: 2011-10-25
  • This paper proposes a low-complexity and robust H-infinity channel estimator for Multiple-input multiple-output (MIMO) Orthogonal frequency division multiplexing (OFDM) systems. To lessen the complexity, the Expectation maximization (EM) and Space-alternating generalized EM (SAGE) algorithms are adopted respectively. To treat with the effect of Non-Gaussian noise (NGN) channels, an Equivalent signal model (ESM) is used to enhance the robust of the EM-type H-infinity estimator. Furthermore, joint estimation using Phase shifted orthogonal (PSO) pilot sequences is applied for improving the estimation and the requirement for pilot. Simulation results show that the H-infinity estimator has almost the same Mean square error (MSE) as Maximum a posteriori (MAP) estimator. By using the ESM, the robustness of EM-type based H-infinity estimator is enhanced against NGN channels. In addition, the MSE and pilot overhead are reduced by applying the joint estimation with PSO.
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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