JISE

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Journal of Information Science and Engineering, Vol. 39 No. 4, pp. 825-838

A Novel Joint Frequency Offset Estimation Scheme for OFDM System

QIAN DU¹, ZHAO-FENG WU⁴, JUN WANG^2,+, WEN-WU XIE^4,+ AND YA-LAN LI^2,3,+
¹Department of Information Science and Engineering
Linyi University
Linyi, Shandong Province, 276000 P.R. China
E-mail: duqian@lyu.edu.cn
²School of Electronic Information and Electrical Engineering
³Hunan Engineering Research Center of Advanced Embedded Computing
and Intelligent Medical Systems
Xiangnan University
Chenzhou, Hunan Province, 423000 P.R. China
E-mail: junwang_cn@qq.com; liyalan@xnu.edu.cn
⁴Department of Information and Communication Engineering
Hunan Institute of Science and Technology
Xiangtan, Hunan Province, 411100 P.R. China
E-mail: gavinxie@hnist.edu.cn; wuzhaofenga@163.com

With the fast development of wireless mobile communication networks, the 4th and 5th-generation wireless mobile communication systems are now applied in different fields. They can be efficiently used in land–air wireless communication to provide wireless Inter-net services for passengers on civilian aircrafts. The frequency offset estimation (FOE) is an important issue in land–air wireless communication environment. Accordingly, a novel joint FOE scheme based on the orthogonal frequency division multiplexing system is pro-posed in this paper. Firstly, this paper proposes a new FOE algorithm based on the peak power ratio (PPR) on the physical random-access channel (PRACH). Secondly, a joint FOE scheme is proposed, which uses the conventional FOE based on the physical uplink shared channel and the proposed PPR FOE based on PRACH. The proposed joint FOE scheme can extend the range of FOE from [−1000 Hz, 1000 Hz] to [−1875 Hz, 1875 Hz] and has better performance than the proposed PPR FOE method and the conventional FOE.

Keywords: frequency offset estimation, peak power ratio, OFDM, 4G, 5G

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