Channel estimation techniques based on pilot arrangement in OFDM systems
Coleri, S.
Ergen, M.
Puri, A.
Bahai, A.
Electr. Eng., California Univ., Berkeley, CA;
This paper appears in: Broadcasting, IEEE Transactions on
Publication Date: Sep 2002
Volume: 48,
Issue: 3
On page(s): 223- 229
ISSN: 0018-9316
INSPEC Accession Number: 7407452
Digital Object Identifier: 10.1109/TBC.2002.804034
Current Version Published: 2002-11-07
Abstract
Channel estimation techniques for OFDM systems based on a pilot arrangement are investigated. Channel estimation based on a comb type pilot arrangement is studied through different algorithms for both estimating the channel at pilot frequencies and interpolating the channel. Channel estimation at pilot frequencies is based on LS and LMS methods while channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to the time domain by means of IDFT (inverse discrete Fourier transform), zero padding and going back to the frequency domain by DFT (discrete Fourier transform). In addition, channel estimation based on a block type pilot arrangement is performed by sending pilots in every sub-channel and using this estimation for a specific number of following symbols. We have also implemented a decision feedback equalizer for all sub-channels followed by periodic block-type pilots. We have compared the performances of all schemes by measuring bit error rates with 16QAM, QPSK, DQPSK and BPSK as modulation schemes, and multipath Rayleigh fading and AR based fading channels as channel models.
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