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|1. (WO2018103036) DOPPLER FREQUENCY OFFSET ESTIMATION METHOD AND DEVICE AND DOPPLER FREQUENCY OFFSET ELIMINATION METHOD AND DEVICE IN OFDM SYSTEM|
|Applicants:||BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS
|Title:||DOPPLER FREQUENCY OFFSET ESTIMATION METHOD AND DEVICE AND DOPPLER FREQUENCY OFFSET ELIMINATION METHOD AND DEVICE IN OFDM SYSTEM|
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.