LS channel estimation for mobile OFDM communications on time-varying frequency-selective fading channels

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

13 Scopus citations

Abstract

A least-squares (LS) channel estimation (CE) technique for mobile OFDM communications over a rapidly time-varying frequency-selective fading channel is investigated in this paper. The proposed technique keeping the comb-type pilot arrangement can achieve low error probability by accurately estimating channel impulse response (CIR) and effectively tracking rapid CIR variations. In addition, the LS CE technique proposed here is conducted in the time domain (TD); meanwhile, a generic estimator is, thus, performed serially block by block without assistance from a priori channel information and without increasing computational complexity. By taking advantage of linearly frequency-modulated (LFM) or pseudorandom signals that are transceived for the purpose of sounding pilot subchannels, the proposed LS channel estimator (CE) can inherently perform pseudo-noise (PN) matched Altering (MF) to suppress multipath interference (MPI) caused by frequency-selective fading and inter-carrier-interference (ICI) resulting from data subchannels. The dual optimality of the LFM and PN pilot symbols is verified for both time-domain (TD) and frequency-domain (FD) CEs. Furthermore, the proposed technique also exhibits good resistance against residual timing errors occurring with the DFT demodulation. Extensive computer simulations in conjunction with statistical derivations show the superiority of the proposed technique.

Original languageEnglish
Title of host publication2007 IEEE International Conference on Communications, ICC'07
Pages3016-3023
Number of pages8
DOIs
StatePublished - 2007
Event2007 IEEE International Conference on Communications, ICC'07 - Glasgow, Scotland, United Kingdom
Duration: 24 Jun 200728 Jun 2007

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486

Conference

Conference2007 IEEE International Conference on Communications, ICC'07
Country/TerritoryUnited Kingdom
CityGlasgow, Scotland
Period24/06/0728/06/07

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