Frequency offset estimation method and device

Abstract

The invention discloses a frequency offset estimation method and device. The method comprises the following steps of carrying out frequency offset estimation for a receiving signal to obtain a first frequency offset estimation result; utilizing the first frequency offset estimation result to carry out frequency offset compensation on the receiving signal and utilizing the receiving signal after frequency offset compensation to establish a likelihood function for a sending signal, a frequency offset and a channel impulse response; and completing secondary frequent offset estimation for the receiving signal through the likelihood function. According to the method and the device, the joint estimation of the frequency offset and the channel is realized, the larger range and the higher precision of the frequent offset estimation are considered, and the influence of the channel condition on the frequent offset estimation is considered.

Description

Technical field [0001] This application relates to the field of mobile communication technology, and in particular to a frequency offset estimation method and device. Background technique [0002] Modern mobile communication pursues faster transmission rate, better transmission quality, higher spectrum efficiency and larger system capacity. Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is one of the implementations of multi-carrier transmission schemes. It is the least complex and most widely used multi-carrier transmission scheme. Due to its extremely high spectral efficiency, It has become one of the key technologies of the fourth generation of mobile multimedia communications. However, OFDM technology is more sensitive to frequency offset, and the generation of frequency offset will destroy the orthogonality between OFDM sub-carriers, and then cause inter-carrier interference. In order to suppress inter-carrier interference, it...

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Problems solved by technology

[0003] At present, the frequency offset estimation methods of related technologies have the following defects: 1) the accuracy of frequency offset estimation and the range of frequency offset estimation cannot be balanced; Offset estimation is interrelated and restricts each other. Channel estimation affects the accuracy of frequency offset estimation to a large extent. Only when frequency offset estimation and channel estimation are taken into account at the same time can frequency offset estimation be more accurate.

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