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A Novel OFDM Integer Frequency Offset Estimation Scheme Using Differential Combining  

Ahn, Sang-Ho (성균관대학교 정보통신공학부)
Chong, Da-Hae (성균관대학교 정보통신공학부)
Han, Tae-Hee (성균관대학교 정보통신공학부)
Kim, Sang-Hyo (성균관대학교 정보통신공학부)
Yoon, Seok-Ho (성균관대학교 정보통신공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.8C, 2008 , pp. 627-632 More about this Journal
Abstract
The timing offset is one of the main error sources in estimating the frequency offset in orthogonal frequency division multiplexing (OFDM) systems. Although some works have been done to mitigate the influence of the timing offset on the frequency offset estimation, most of the investigations require the knowledge of the timing offset range, which is not generally available in practical systems. In this paper, we propose a new frequency offset estimation scheme using differential combining between two successive correlation samples, which does not require the knowledge of the timing offset range, and thus, is robust to the timing offset variation. The simulation results show that the proposed scheme is not only robust to the timing offset variation, but also generally performs better than the conventional scheme on the average, in the case of the timing offset range being not known exactly.
Keywords
Orthogonal frequency division multiplexing (OFDM); timing offset. frequency offset; estimation; differential combining;
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