Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, China

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Abstract—Orthogonal frequency division multiplexing (OFDM) is a multi-carrier digital modulation technique. It’s likely to be used in next generation high-speed railway communication system. When OFDM is used in the communication of high-speed railway user s, Doppler frequency shift will become an important technical barrier, because OFDM is sensitive to frequency offset. Especially in high-speed movement environment, Doppler frequency shift can destroy the orthogonal characteristic between subcarriers in OFDM system. In this paper, we analyze the performance of OFDM system in high-speed movement environment and propose a new Doppler spread estimation algorithm to improve the bit error rate (BER) performance. Theoretical analysis and computer simulations present the advantages of the proposed approach, especially under high-speed railway environment.

Index Terms—High-speed movement environment, OFDM, Doppler frequency shift, Frequency offset estimation

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Cite: Yunlv Hong, Di He, "An Improved Doppler Frequency Offset Estimation Algorithm of OFDM System under High-speed Movement Environment," Journal of Computers vol. 8, no. 11, pp. 3191-3195, 2013.