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1. (WO2018103036) DOPPLER FREQUENCY OFFSET ESTIMATION METHOD AND DEVICE AND DOPPLER FREQUENCY OFFSET ELIMINATION METHOD AND DEVICE IN OFDM SYSTEM

Pub. No.:    WO/2018/103036    International Application No.:    PCT/CN2016/109003
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Fri Dec 09 00:59:59 CET 2016
IPC: H04B 7/01
H04L 27/26
Applicants: BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS
北京邮电大学
Inventors: ZHANG, Qixun
张奇勋
GAO, Chao
高超
FENG, Zhiyong
冯志勇
ZHENG, Tingting
郑婷婷
ZHANG, Pengyi
张鹏毅
Title: DOPPLER FREQUENCY OFFSET ESTIMATION METHOD AND DEVICE AND DOPPLER FREQUENCY OFFSET ELIMINATION METHOD AND DEVICE IN OFDM SYSTEM
Abstract:
Embodiments of the present application provide a Doppler frequency offset estimation method and device and a Doppler frequency offset elimination method and device in an OFDM system. The Doppler frequency offset estimation method in the OFDM system comprises: receiving an OFDM transmission signal, wherein a first OFDM symbol in a first OFDM frame in the OFDM transmission signal comprises Q preset cyclic prefixes, and Q is greater than or equal to 3; performing paired autocorrelation on all the preset cyclic prefixes to obtain a plurality of autocorrelation functions; summing all the autocorrelation functions to obtain a probability density function; performing maximum likelihood estimation on the probability density function to obtain an initial Doppler frequency offset and a Doppler change rate; and estimating, according to the initial Doppler frequency offset and the Doppler change rate, a target Doppler frequency offset that varies with a change of a signal sequence position in the first OFDM frame. The embodiments of the present application improve the accuracy of an estimation result and increase the effect of elimination of a Doppler effect.