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A New Carrier frequency Offset Estimation Using CP-ICA Scheme in OFDM Systems  

Kim, Jong-Deuk (시립인천대학교 전자공학과 신호처리연구실)
Byun, Youn-Shik (시립인천대학교 전자공학과 신호처리연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.12C, 2006 , pp. 1257-1264 More about this Journal
Abstract
The carrier frequency offset causes loss of orthogonality between sub-carriers, thus leads to inter-carrier interference (ICI) in the OFDM symbol. This ICI causes severe degradation of the BER performance of the OFDM receiver. In this paper, we propose a new ICI cancellation algorithm which estimates frequency offset at the time-domain by using CP-ICA method to the received sub-carriers phase rotation. This algorithm is based on a statistical blind estimation method, which mainly utilizes the EVD, rotating phase and the $4^{th}-cumulants$. Since our scheme does not need any training and pilot symbol in estimation, we can expect enhanced bandwidth efficiency in OFDM systems. Simulation results show that the proposed frequency offset estimator is more accurate than the other estimators in $0.0<\varepsilon<1.0$.
Keywords
OFDM; CP-ICA; Frequency Offset; EVD; Rotating Phasor;
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