Frequency offset estimation method and device

Abstract

The invention discloses a frequency offset estimation method and device. The method comprises the steps of converting local pilot data from a frequency domain to a time domain, and carrying out correlation operation on pilot data of the time domain obtained through pre-calculation and the local pilot data, thereby obtaining a phase sequence; determining the number of sequence points at which a phase is inverted according to a maximum time advance degree Ta estimation value in a current time slot, wherein the Ta estimation value comprises at least one of the Ta estimation value obtained through pre-calculation and effectively maintained history Ta estimation values; and reconstructing the phase sequence according to the number of the sequence points and carrying out frequency offset estimation on the reconstructed phase sequence. Through application of the method and the device, the frequency offset estimation is realized well; the system performance is improved; and the problem that in the prior art, OFDM (Orthogonal Frequency Division Multiplexing) synchronization in an LTE (Long Term Evolution) system cannot be solved well, in particular, the problem that accurate frequency offset estimation cannot be carried out on a single pilot symbol under the condition of frequency hopping and high time offset, is solved,

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] A new generation of mobile communication systems requires high-speed, high-spectrum efficiency, and large-capacity multimedia data transmission capabilities. In a wireless environment, high-speed data transmission will cause severe frequency selective line fading, and OFDM (Orthogonal Frequency Division Multiplexing) technology stands out due to its outstanding advantages and has become the LTE (Long Term Evolution, Long Term Evolution) technology. mainstream technology. [0003] OFDM is a multi-carrier transmission technology with sub-carriers orthogonal to each other. It divides a wide transmission bandwidth into multiple sub-carriers that are orthogonal to each other for parallel data transmission. It has high spectrum utilization, anti-multipath fading, and MIMO (Multiple-Input Multiple-Outp...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method and device for estimating frequency offset, which is used to solve the problem that the prior art cannot well solve OFDM synchronization under the LTE s...

Images