Frequency offset estimation method, device and receiver

Abstract

The invention discloses a frequency offset estimation method, device and receiver and belongs to the technical field of communication. The method comprises the steps of performing frequency offset estimation according to a received synchronous signal and a known time domain sequence and obtaining a first frequency offset estimation value; determining the time information of the synchronous signal according to the first frequency offset estimation value; obtaining the phase difference between the known time domain sequence and the synchronous signal according to the time information, the phase information of the known time domain sequence and the phase information of the synchronous signal; obtaining a second frequency offset estimation value according to the obtained phase difference; judging whether the second frequency offset estimation value is effective or not; when the second frequency offset estimation value is not effective, taking the first frequency offset estimation value as the frequency offset estimation value; when the second frequency offset value is effective, obtaining the frequency offset estimation value according to the second frequency offset estimation value. The frequency offset estimation is performed by the synchronous signal and the known time domain, so the signal received by a received end can be normally demodulated.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a frequency offset estimation method, device and receiver. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology is a special multi-carrier transmission technology, which uses multiple sub-carriers to transmit user information, and OFDM technology uses orthogonal sub-carriers to carry information and areas. molecular channel. It is precisely because OFDM technology requires each subcarrier to be orthogonal to each other, therefore, the communication system based on OFDM technology requires the frequency synchronization of the signal at the receiving end and the transmitting end, so it is necessary to estimate the frequency offset of the signal, so as to achieve the reception through frequency offset estimation. The purpose of synchronizing the signal frequency of the terminal and the transmitting terminal. [0003] Generally, ...

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Problems solved by technology

[0005] In the process of frequency offset estimation, the target range of signal frequency offset is generally determined in advance. When the obtained frequency offset estimation value falls within the target range, the received signal can be accurately resolved according to the frequency offset estimation value. However, the frequency offset estimation value obtained by performing a frequency offset estimation through the above frequency offset estimation algorithm is difficult to be within the target range, so that the transmitting end and the receiving end cannot achieve the purpose of signal frequency synchronization, and the receiving end is affected by the received signal. The normal demodulation of the signal leads to a sharp decline in the performance of the communication system

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