Symbol and Carrier Synchronization in OFDM
Date
2002
Authors
Journal Title
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Publisher
ORCID
Type
Degree Level
Masters
Abstract
Orthogonal Frequency Division Multiplexing (OFDM) has attracted more and more attention in wireless communications and is very promising for the next generation wireless networks. One major disadvantage of OFDM is that it is very sensitive to timing offset and carrier offset.
A timing recovery algorithm based on power estimation and a pilot symbol assisted carrier recovery algorithm are proposed in this thesis. The performance of the timing recovery algorithm is also analyzed theoretically. Simulation results show that the probability of false detection is accurately represented by the theoretical results, however the probability of missing a detection is higher than that of predicted by theory because of an assumption of independence used to simplify the analysis. The carrier recovery algorithm can correct frequency offset up to 50% of the channel bandwidth with very small residual offset, but requires a long sequence of pilot symbols. This work shows that trade-offs have to be made when choosing the power window length for timing recovery and the number of pilot symbols for carrier recovery.
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Citation
Degree
Master of Science (M.Sc.)
Department
Electrical Engineering