A frequency offset estimation method and device

Abstract

The embodiment of the invention discloses a frequency offset estimation method and apparatus. The frequency offset estimation method comprises the following steps: performing frequency offset pre-compensation on obtained uplink data by a base station to obtain (2N+1) paths of pre-compensation data, then determining a first frequency offset estimation value of a terminal according to the maximum useful signal receiving power of the (2N+1) paths of pre-compensation data, obtaining a second frequency offset estimation value according to a phase difference of two pilot symbols of the pre-compensation data corresponding to the maximum useful signal receiving power, and finally obtaining the frequency offset estimation value of the terminal according to the first frequency offset estimation value and the second frequency offset estimation value. Therefore, frequency offset pre-compensation estimation is combined with pilot symbol estimation so as to effectively expand the frequency offset estimation range, improve the frequency offset estimation precision and the demodulation ability of the base station for PUCCH, and to avoid the possible technical problems of small frequency offset estimation range and low precision of the frequency offset estimation method of PUCCHformat2 / 2a / 2b in the prior art.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a frequency offset estimation method and device. Background technique [0002] In a wireless communication system, factors such as the frequency difference between the terminal and the base station and the Doppler frequency shift caused by the movement of the terminal will cause a certain frequency offset in the carrier frequency received by the base station, referred to as frequency offset. Since the existence of the frequency offset will destroy the orthogonality of the carrier, resulting in the degradation of the decoding performance of the base station, it is necessary to estimate the frequency offset. [0003] In the LTE (Long Term Evolution, long-term evolution) system, the terminal sends an uplink scheduling instruction or PDSCH (Physical Downlink Shared Channel, physical downlink shared channel) feedback information to the base station through the P...

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Problems solved by technology

[0004] The present invention provides a frequency offset estimation method and device, which are used to solve the technical problems of small frequency offset estimation range or low frequency offset estimation accuracy that may exist in the frequency offset estimation method applied to PUCCH format2 / 2a / 2b in the prior art

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