Super-Imposed Training Scheme for Timing and Frequency Synchronization in OFDM Systems

In this paper, a super-imposed scheme for timing and frequency synchronization is proposed for orthogonal frequency division multiplexing (OFDM) systems. The proposed architecture includes a pre-defined pseudo-noise (PN) sequence, which is added to both the OFDM symbol and the cyclic prefix (CP) in...

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Bibliographic Details
Published in:IEEE transactions on broadcasting 2007-06, Vol.53 (2), p.574-583
Main Authors: LI, Chih-Peng, HU, Wei-Wen
Format: Article
Language:English
Subjects:
Applied sciences
Architecture
AWGN channels
Bandwidth
Bit error rate
Channels
Computer simulation
Detection, estimation, filtering, equalization, prediction
Estimators
Exact sciences and technology
Fading
Frequency estimation
Frequency offset
Frequency synchronization
Information, signal and communications theory
Maximum likelihood estimation
Multiplexing
OFDM
Organization, operation and development plans
Orthogonal Frequency Division Multiplexing
PAPR
Peak to average power ratio
Radiocommunications
Signal and communications theory
Signal, noise
super-imposed
Symbols
Synchronism
synchronization
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Time measurements
Timing
Transmission and modulation (techniques and equipments)
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Description
Summary:In this paper, a super-imposed scheme for timing and frequency synchronization is proposed for orthogonal frequency division multiplexing (OFDM) systems. The proposed architecture includes a pre-defined pseudo-noise (PN) sequence, which is added to both the OFDM symbol and the cyclic prefix (CP) in time domain. In contrast to existing synchronization schemes, the proposed architecture has the advantage of better bandwidth utilization since it does not require extra pilot symbols. The peak-to-average power ratio (PAPR) is also significantly decreased. Both the timing and frequency offset estimators are derived using the maximum likelihood (ML) criterion. Efficiencies of the estimators are analyzed mathematically in AWGN channels. Simulation experiments are also conducted in frequency selective fading channels. Moreover, the optimal power allocation factor of the PN sequence is determined by minimizing the bit error rate using simulation experiments
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2007.893431