Method and device for frequency offset estimation

Abstract

The invention relates to a frequency offset estimation method and device. The method comprises the steps of: obtaining a received baseband signal; according to a frequency offset compensation value, performing frequency offset compensation on the baseband signal, wherein the frequency offset compensation value is related to an open-loop frequency offset estimation value in the last time and a frequency offset reference value; and the frequency offset reference value is related to the inherent frequency offset of user equipment and a base station; performing Fourier transform and channel estimation on the frequency offset compensated signal; according to the signal after channel estimation, calculating the open-loop frequency offset estimation value at this time and a reference signal receiving quality parameter; according to the reference signal receiving quality parameter, determining a reported frequency offset reference value; and, calculating a corresponding frequency offset compensation value, and taking the frequency offset compensation value obtained by calculation as the frequency offset compensation value in the next time. By means of the scheme, the frequency offset estimation accuracy and the calculation precision of the reference signal receiving quality parameter can be improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for frequency offset estimation. Background technique [0002] When the user equipment (User Equipment, UE) is in a high-speed motion environment (such as a high-speed rail environment), its downlink channel presents a high Doppler feature, and the inherent frequency offset of the UE and the base station (eNodeB) and the high Doppler Le superposition will cause a large frequency offset in the UE downlink received signal, which will affect the estimation of Reference Signal Received Power (RSRP) / Reference Signal Received Quality (RSRQ) and the frequency of adjacent cells. Offset / Time Offset Tracking. [0003] Currently, frequency offset estimation is performed by using resource elements (REs) of cell specific reference signals (CRS) in Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols. [0004] However, if ...

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Problems solved by technology

[0004] However, if the above method is used for frequency offset estimation, the estimation range will be limited, the accuracy of frequency offset estimation will be low, and the calculation of RSRP / RSRP will be inaccurate

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