Frequency offset estimation method and device

Abstract

The embodiment of the invention discloses a frequency offset estimation method and device, relating to the technical field of wireless communication, which are used for improving the accuracy of the result of frequency offset estimation. The frequency offset estimation method comprises the following steps of: a receiving end receiving a signal and a training serial number sent by a sending end, obtaining a training sequence according to the training serial number, and constructing a generalized inverse matrix of a correlation matrix of the training sequence; generating the correlation matrix constructed by a received signal; obtaining a channel impulse response correlation vector with frequency offset according to the generalized inverse matrix and the correlation matrix constructed by the received signal; and carrying out frequency offset estimation according to the correlation vector. Based on a multipath transmission model, channel estimation results are unnecessary for the frequency offset estimation; and the accuracy of result of frequency offset estimation can be efficiently improved by adopting the frequency offset estimation method and device.

Description

Technical field [0001] The present invention relates to the field of wireless communication, and in particular to a frequency offset estimation method and equipment. Background technique [0002] In wireless communication, the frequency deviation caused by the oscillators of the receiving end and the transmitting end, or the Doppler frequency shift caused by the relatively fast movement of the transmitting end and the receiving end, will cause the phase rotation of the received symbol over time, that is, the frequency deviation. If no correction is added, the bit error rate at the receiving end will be greatly increased. Therefore, before equalizing and demodulating the received signal, it is often necessary to perform frequency offset compensation, especially in scenarios with severe frequency offset, such as the GSM-R system. [0003] Before performing frequency offset compensation, first need to perform frequency offset estimation. The classic frequency offset estimation algori...

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Problems solved by technology

[0005] On the one hand, since channel estimation is often affected by frequency offset, especially when the frequency offset is relatively large, the accuracy of frequency offset estimation results is low; on the other hand, the frequency offset estimation range of existing algorithms is limited , cannot track a large frequency offset, so that accurate frequency offset estimation results cannot be obtained

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