Exact Signal Model and New Carrier Frequency Offset Compensation Scheme for OFDM

Carrier frequency offset (CFO) causes spectrum misalignment of transmitter and receiver filters. This misalignment leads to energy loss and distortion of received signal, resulting in performance degradation of the whole system. However, these issues are often overlooked by existing works. This pape...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2012-02, Vol.11 (2), p.550-555
Main Authors: Xie, Baile, Qiu, Wenxun, Minn, Hlaing
Format: Article
Language:English
Subjects:
Applied sciences
Bit error rate
Carrier frequencies
Carrier frequency offset
CFO compensation
Channel estimation
Compensation
Distortion
Energy loss
Estimation
Exact sciences and technology
Information, signal and communications theory
Misalignment
Multiplexing
OFDM
Offsets
Orthogonal Frequency Division Multiplexing
Oscillators
preamble design
Radiocommunications
Receivers
Signal and communications theory
signal model
Spectra
spectrum misalignment
Telecommunications
Telecommunications and information theory
Training
Transmitters. Receivers
Wireless communication
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Description
Summary:Carrier frequency offset (CFO) causes spectrum misalignment of transmitter and receiver filters. This misalignment leads to energy loss and distortion of received signal, resulting in performance degradation of the whole system. However, these issues are often overlooked by existing works. This paper presents an exact signal model for OFDM that takes into account the CFO-induced spectral misalignment and related aliasing effects. Incorporating these practical issues, we also propose a new preamble structure and a new CFO compensation approach to mitigate their negative effects. Theoretical analysis and simulation results substantiate the importance of the exact signal model and the advantage of the proposed CFO compensation scheme.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2011.120611.111490