Improved channel estimation in OFDM systems in the presence of CFO

Authors:
J. Oliver;R. Aravind;K. M. M.
Affiliations:
Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India;Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India;Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India
Venue:
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
Year:
2009

Citing 5
Cited 0

Fundamentals of statistical signal processing: estimation theory

Fundamentals of statistical signal processing: estimation theory
OFDM for Wireless Multimedia Communications

OFDM for Wireless Multimedia Communications
OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting

OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting
Orthogonal Frequency Division Multiplexing for Wireless Communications (Signals and Communication Technology)

Orthogonal Frequency Division Multiplexing for Wireless Communications (Signals and Communication Technology)
Joint estimation of channel response, frequency offset, and phase noise in OFDM

IEEE Transactions on Signal Processing

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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.