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An Improved Integer Frequency Offset Estimation in OFDM Systems Using Maximum Likelihood Function  

Nam, Do-Won (삼성전자 정보통신총괄 통신연구소)
Yoon, Dongweon (한양대학교 전자통신컴퓨터공학부)
Park, Sang-Kyu (한양대학교 전자통신컴퓨터공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.2A, 2006 , pp. 103-109 More about this Journal
Abstract
OFDM system has a disadvantage of sensitiveness about the effect of the frequency offset caused by the discord of oscillators in transmitter and receiver. The frequency offset can be divided into integral part and decimal part. Although the frequency offset of integral part do not effect orthogonality between subcarriers, it makes the bit error probability become to 0.5 because of circular transient among transmitted data symbols. This paper proposes a new estimation scheme of the frequency offset of integral part by Maximum Likelihood (ML) demanding only one training symbol in multipath fading channel environment. This proposed scheme not only can reduce the number of training symbol but do not increase the complexity and it shows the better performance by simulation.
Keywords
OFDM; Frequency Offset; Estimation; Maximum Likelihood.;
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