A time and frequency synchronization scheme for multiuser OFDM

We present a multiuser synchronization scheme for tracking the mobile's uplink time and frequency offsets. It uses the redundancy introduced by the cyclic prefix and does not need additional pilots. We show performance results of an orthogonal frequency division multiplexing (OFDM)-based radio...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 1999-11, Vol.17 (11), p.1900-1914
Main Authors: van de Beek, J.-J., Borjesson, P.O., Boucheret, M.-L., Landstrom, D., Arenas, J.M., Odling, P., Ostberg, C., Wahlqvist, M., Wilson, S.K.
Format: Article
Language:English
Subjects:
3G mobile communication
Base stations
Broadcasting
Channels
Downlink
Electrical Engineering, Electronic Engineering, Information Engineering
Elektroteknik och elektronik
Engineering and Technology
Frequency estimation
Frequency synchronization
GSM
Noise levels
OFDM
Orthogonal Frequency Division Multiplexing
Pilots
Proposals
Signal Processing
Signalbehandling
Synchronism
Synchronization
Teknik
Time division multiple access
Tracking
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Summary:We present a multiuser synchronization scheme for tracking the mobile's uplink time and frequency offsets. It uses the redundancy introduced by the cyclic prefix and does not need additional pilots. We show performance results of an orthogonal frequency division multiplexing (OFDM)-based radio interface based on the universal mobile telecommunication system (UMTS) parameters. For a UMTS-typical mobile channel environment, the performance of a coherent system employing the scheme is virtually indistinguishable from the performance of a perfectly synchronized system. In a differentially modulated system, synchronization errors decrease the system performance by about 0.7 dB compared to a perfectly synchronized system.
ISSN:0733-8716
1558-0008
1558-0008
DOI:10.1109/49.806820