Frequency offset adaptive tracking compensation method and device, and user equipment

Abstract

The invention provides a frequency offset adaptive tracking compensation method and device and user equipment. The method comprises the steps that when the signal-to-noise ratio of a received signal is higher than a first threshold value or the confidence coefficient of a frequency offset estimation value corresponding to the received signal is higher than a second threshold value, carrying out periodic sampling on the frequency offset estimation value corresponding to the received signal; training the sampled frequency offset estimation value to form a frequency offset estimation value changemodel; and when the signal-to-noise ratio of the received signal is lower than a third threshold value or the confidence coefficient of the frequency offset estimation value corresponding to the received signal is lower than a fourth threshold value, performing adaptive compensation on automatic frequency control by using a frequency offset estimation value change model. The performance of automatic frequency control frequency offset tracking of a mobile communication baseband system can be effectively enhanced, and the performance of automatic frequency control frequency offset tracking of amobile terminal under a low signal-to-noise ratio or a low confidence coefficient is mainly improved; and on the other hand, the frequency offset adaptive tracking compensation accuracy can be improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a frequency offset adaptive tracking compensation method, device and user equipment. Background technique [0002] In a mobile communication system, it is necessary to ensure frequency synchronization between the sending end and the receiving end. Since the oscillator frequency deviation and the movement of the terminal may cause frequency deviation at the transceiver end, automatic frequency control (Automatic Frequency Control, "AFC") has become an important component in a coherent communication system. Mainly, the oscillator frequency at the receiving end is compensated through the frequency offset estimator and the frequency offset controller in the automatic frequency controller. [0003] Among them, if the receiving end is in a single cell that cannot be handed over / reselected or similar environments (such as some instrument use cases and outfield island cel...

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Problems solved by technology

However, it is impossible to accurately track the change of the frequency offset. Therefore, in a scene with a low signal-to-noise ratio, or when the confidence of the AFC frequency offset tracking estimate decreases, it is necessary to use a certain adaptive compensation method to enhance the performance of the AFC frequency offset tracking in this scenario. performance

[0005] However, the AFC frequency offset tracking under low SNR in the prior art is mainly based on the AFC frequency offset tracking estimation value under low SNR for adaptive compensation; however, the AFC frequency offset under low SNR The confidence of the tracking estimated value has decreased, and the change of the frequency offset cannot be accurately tracked, so that adaptive compensation cannot be performed or the adaptive compensation effect is poor

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