Optimal delay estimation for phase-rotated linearly interpolative channel estimation in OFDM and OFDMA systems

Kun Chien Hung*, David W. Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We consider the phase-rotated linearly interpolative channel estimation technique for multicarrier transmission. The technique models the channel frequency response between two nearby subcarriers as the product of a linear function and a linear-phase factor, where the linear-phase factor may be equivalently modeled in the time domain as a reference delay dubbed the anchor delay in this work. We show that the performance of the technique is a fourth-order function of the channel path delays and the anchor delay. We derive a method to estimate the optimal anchor delay. Analysis and simulation in a context of Mobile WiMAX downlink transmission show that, with the proposed anchor delay estimate, we can attain better performance in channel estimation than conventional linear interpolation and a previously proposed method of phase-compensated linear interpolation.

Original languageEnglish
Pages (from-to)349-352
Number of pages4
JournalIEEE Signal Processing Letters
Volume15
DOIs
StatePublished - 1 Dec 2008

Keywords

  • Channel estimation
  • Delay estimation
  • IEEE 802.16e
  • Orthogonal frequency-division multiple access (OFDMA)
  • WiMAX downlink

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