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Improved channel estimation in OFDM systems in the presence of CFO
J. Oliver, , K. M.Muraleedhara Prabhu
Published in
2009
Pages: 398 - 401
Abstract
We consider the problem of pilot-aided accurate least squares (LS) channel estimation in the presence of carrier frequency offset (CFO). We first formulate the mean square error (MSE) of the LS channel estimator in the presence of CFO and then show how to select the pilot sequence (with element values constrained to plus or minus one) that minimizes the MSE. Our main conclusion is that, in the presence of CFO accurate channel estimates can be obtained by transmitting identical pilot symbol on all subcarriers. We demonstrate our results via computer simulations. ©2009 IEEE.
About the journal
Journal2009 15th Asia-Pacific Conference on Communications, APCC 2009
Open AccessNo
Concepts (22)
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    ACCURATE CHANNELS
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    CARRIER FREQUENCY OFFSET (CFO)
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    CARRIER FREQUENCY OFFSETS
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    CHANNEL ESTIMATOR
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    INTERCARRIER INTERFERENCE
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    Least squares
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    LEAST SQUARES CHANNEL ESTIMATION
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    OFDM SYSTEMS
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    PILOT AIDED
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    PILOT SEQUENCES
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    PILOT SYMBOLS
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    SUB-CARRIERS
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    Block codes
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    Channel estimation
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    Computer simulation
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    Estimation
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    Frequency allocation
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    Mean square error
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    Orthogonal frequency division multiplexing
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    Signal encoding
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    Strain energy
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    Frequency estimation