Design of Efficient Frequency Offset Estimator for MB-OFDM based UWB Systems 


Vol. 34,  No. 3, pp. 311-321, Mar.  2009


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  Abstract

This paper proposes an efficient frequency offset estimation algorithm for MB-OFDM based UWB systems. The time-frequency interleaving in MB-OFDM extends the time-interval between two transmitted OFDM symbols in the same sub-band. The extended time-interval causes not only the degradation of the system performance by reducing frequency offset estimation range, but also the increase of the hardware complexity by requiring the larger number of storing samples. The proposed estimation algorithm expands the estimation range by applying the proposed sign detection scheme. Simulation results show that the estimation range is increased above 30 ppm compared with a conventional auto-correlation based scheme. The estimation is performed on only one sub-band, and the frequency offsets of the others are calculated by relation to center frequency. This way reduced the number of the storing samples by about 1/3. The frequency offset estimator with the proposed algorithm was designed into the architecture which minimizes hardware overhead by time-sharing operators and memory units, and which was synthesized to gate-level circuits using 0.13 μm CMOS technology, and the total gates were about 47K.

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  Cite this article

[IEEE Style]

K. Kim, Y. Jung, J. Kim, "Design of Efficient Frequency Offset Estimator for MB-OFDM based UWB Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 3, pp. 311-321, 2009. DOI: .

[ACM Style]

Kilhwan Kim, Yunho Jung, and Jaeseok Kim. 2009. Design of Efficient Frequency Offset Estimator for MB-OFDM based UWB Systems. The Journal of Korean Institute of Communications and Information Sciences, 34, 3, (2009), 311-321. DOI: .

[KICS Style]

Kilhwan Kim, Yunho Jung, Jaeseok Kim, "Design of Efficient Frequency Offset Estimator for MB-OFDM based UWB Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 3, pp. 311-321, 3. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880