Timing recovery for OFDM transmission

Orthogonal frequency division multiplexing (OFDM) is an effective modulation technique for high-rate and high-speed transmission over frequency selective fading channels. However, OFDM systems can be extremely sensitive and vulnerable to synchronization errors. In this paper, we present a scheme for...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2000-11, Vol.18 (11), p.2278-2291
Main Authors: Baoguo Yang, Letaief, K.B., Cheng, R.S., Zhigang Cao
Format: Article
Language:English
Subjects:
Bandwidths
Channels
Clocks
Correlation
Delay effects
Delay estimation
Estimation error
Fading
Frequency synchronization
OFDM modulation
Orthogonal Frequency Division Multiplexing
Recovery
Sampling
Sampling methods
Studies
Symbols
Synchronism
Synchronization
Time measurements
Timing
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Summary:Orthogonal frequency division multiplexing (OFDM) is an effective modulation technique for high-rate and high-speed transmission over frequency selective fading channels. However, OFDM systems can be extremely sensitive and vulnerable to synchronization errors. In this paper, we present a scheme for performing timing recovery that includes symbol synchronization and sampling clock synchronization in OFDM systems. The scheme is based on pilot subcarriers. In the scheme, we use a path time delay estimation method to improve the accuracy of the correlation-based symbol synchronization methods, and use a delay-locked loop (DLL) to do the sampling clock synchronization. It is shown that by using this scheme, the mean square values of the symbol timing estimation error can be decreased by several orders of magnitude compared to the common correlation methods in both the AWGN and multipath fading channels. In addition, the scheme can track the symbol timing drift caused by the sampling clock frequency offsets.
ISSN:0733-8716
1558-0008
DOI:10.1109/49.895033