A Study on OFDM Systems Using ICI Self-cancellation Scheme to Mitigate the Frequency Perturbation Influences
Date Issued
2006
Date
2006
Author(s)
Huang, Chun-Ta
DOI
en-US
Abstract
In this thesis, the carrier frequency offset and phase noise effects in OFDM systems are analyzed. These non-ideal effects induce inter-carrier interference (ICI) which may deteriorate system’s performance. The ICI self-cancellation schemes, including data-conversion, data-conjugate, and our modified data-conjugate methods are analyzed and simulated. The theoretical derivation and simulation results show that our modified data-conjugate method shares the lower PAPR that data-conjugate method has and yet has CIR improvements. Moreover, to increase the bandwidth efficiency of normal ICI self-cancellation schemes, a multi-rate ICI self-cancellation scheme is also proposed. The simulations are done in both phase noise and carrier frequency offset environments. Results show that with some extra power, the multi-rate ICI self-cancellation scheme can be effectively used in OFDM systems to combat phase noise problems.
Subjects
正交分頻多工
頻率漂移
相位雜訊
OFDM
frequency offset
phase noise
ICI self-cancellation
Type
thesis
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