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Improved least squares channel estimation for orthogonal frequency division multiplexing
J. Oliver, , K. M.Muraleedhara Prabhu
Published in
2012
Volume: 6
   
Issue: 1
Pages: 45 - 53
Abstract
The authors consider the design of pilot sequences for channel estimation in the presence of carrier frequency offset (CFO) in systems that employ orthogonal frequency division multiplexing (OFDM). The CFO introduces intercarrier interference (ICI) which degrades the accuracy of the channel estimation. In order to minimise this effect, the authors design pilot sequence that minimises the mean square error (MSE) of the modified least squares (mLS) channel estimator. Since the identical pilot sequence, which minimises this MSE, has high peak-to-average power ratio of the OFDM signal, an alternative approach is proposed for channel estimation. The authors first introduce a new estimator as an alternative to the mLS estimator and design a low PAPR pilot sequences tailored to this new estimator. They show that the proposed procedure completely eliminates the effect of the ICI on the channel estimate. They then extend their design of pilot sequences for realistic sparse channels. Both analytical and computer simulation results presented in this study demonstrate the superiority of the proposed approach over conventional methods for channel estimation in the presence of ICI. © 2012 The Institution of Engineering and Technology.
About the journal
JournalIET Signal Processing
ISSN17519675
Open AccessNo
Concepts (18)
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    Alternative approach
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    CARRIER FREQUENCY OFFSETS
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    CHANNEL ESTIMATE
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    CHANNEL ESTIMATOR
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    Conventional methods
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    INTERCARRIER INTERFERENCE
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    LEAST SQUARES CHANNEL ESTIMATION
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    MODIFIED LEAST SQUARES
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    OFDM SIGNAL
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    PEAK TO AVERAGE POWER RATIO
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    PILOT SEQUENCES
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    SPARSE CHANNELS
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    Computer simulation
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    Design
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    Estimation
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    Mean square error
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    Orthogonal frequency division multiplexing
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    Channel estimation