Frequency Synchronization for OFDM System n Very High Mobility Environment
Date Issued
2008
Date
2008
Author(s)
Lan, Yi-Yao
Abstract
This thesis emphasize on frequency synchronization for OFDM in very high mobility environment. The very high mobility environment for TAIWAN HIGH SPEED RAIL (300km/hr) leads to critical doppler effect, so the channel will cause fast fading and multipath interference (doubly selective channel).The mismatch between transmitter and receiver and doppler effect will bring about carrier frequency offset. In order to working OFDM technique in very high mobility environment, we propose multiple sections training symbol method、weighting method and prediction mode method to resist time-variant channel and then do carrier frequency offset estimation。After we finish carrier frequency offset estimation, we do frequency compensation to reach whole frequency synchronization.
Subjects
Very high mobility environment
OFDM
Carrier frequency offset
Doppler effect
Doubly selective channel
Frequency synchronization
Type
thesis
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ntu-97-R95942119-1.pdf
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