| A Coarse Frequency Offset Estimation Based on the Differential Correlation in DAB Systems |
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Han-Jong Kim1, Jong-Ho Paik2, Cheol-Hee Park2, Young-Hwan You2, Min-Chul Ju2, Jin-Woong2 |
1School of Information Technology Electronics Engineering, Korea University of Technology and Education
2Korea Electronics Technology Institute (KETI) |
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| Abstract |
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This paper presents a new and robust technique for a coarse frequency offset estimation in OFDM systems. As an evaluation of the proposed algorithm, we apply it to Eureka 147 DAB system. The proposed coarse frequency offset estimation algorithm is based on the differential detection technique between adjacent subcarriers to eliminate the phase shift effects of symbol timing offset and fractional frequency offset. A coarse frequency offset is determined from the correlation output between a received interarrier differential phase reference symbol and several locally generated but frequency-shifted intercarrier differential phase reference symbols. The performance of our estimation algorithm is evaluated by means of computer simulation and is compared with those of previous proposed algorithms for DAB transmission modes I, II, III, and IV. Simulation results show that the proposed algorithm generates extremely accurate estimates with low complexity irrespective of the symbol timing offset. |
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