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|Title: ||Performance degradation due to the synchronization error in OFDM|
|Authors: ||Sung, Kwok Ho|
|Department: ||Department of Electronic Engineering|
|Issue Date: ||2009|
|Supervisor: ||Supervisor: Dr. Wong, W K ., Assessor: Prof. Zhang, Keith Q T|
|Abstract: ||Synchronization is an important task in orthogonal frequency division multiplexing
(OFDM). Typical synchronization error includes carrier frequency offset (CFO), carrier
phase offset, sampling clock offset (SCO) and symbol timing offset have been
addressed. They will cause performance (symbol error ratio SER) degradation. In this
project, we study the effect of synchronization error for BPSK, QPSK, 16QAM,
64QAM and 256QAM systems under an Additive White Gaussian Channel (AWGN).
Various parameters like the number of carriers and sampling rate (i.e. the oversampling
factor) have been addressed. Theoretical analysis has been performed and verified with
computer simulations using MATLAB.
Exact theoretical evaluation of SER is performed for symbol timing offset and Monte
Carlo method is used for that of CFO and SCO because it appears impossible to
evaluate the exact SER when the number of modulation level and number of carrier is
above 16. Finally, two phase estimator techniques are proposed to restore the phase
rotation and improve the overall SER performance.|
|Appears in Collections:||Electronic Engineering - Undergraduate Final Year Projects|
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