Pilot-aided multicarrier channel estimation via MMSE linear phase-shifted polynomial interpolation

Kun Chien Hung*, David W. Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Current wireless multicarrier systems commonly adopt pilot-aided channel estimation, for which a simplest and least restrictive technique is polynomial interpolation in the frequency domain. For channels with large delay spreads, however, the performance of low-order polynomial interpolation suffers from modeling error. The problem may be remedied by adding a linear phase shift to the interpolator, or equivalently, a "window shift" in the time domain. We derive a method to estimate the optimal window shift, in the minimum mean-square error (MMSE) sense, for polynomial-interpolative channel estimation of arbitrary order. As a practical application, we show how to apply the resultant technique to Mobile WiMAX downlink channel estimation. In addition, we propose a method to automatically select the interpolation order based on some estimated MSE.

Original languageEnglish
Article number5487532
Pages (from-to)2539-2549
Number of pages11
JournalIEEE Transactions on Wireless Communications
Volume9
Issue number8
DOIs
StatePublished - 1 Aug 2010

Keywords

  • Channel estimation
  • delay estimation
  • orthogonal frequency-division multiple access (OFDMA)
  • orthogonal frequency-division multiplexing (OFDM)
  • polynomial interpolation

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