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Frequency control method and device

A frequency control and sub-frequency technology, applied in the field of communication, can solve the problems of demodulation performance loss, data signal frequency offset residue, demodulation performance degradation, etc., to achieve accurate results and reduce the effect of frequency offset residue

Active Publication Date: 2011-06-22
HONOR DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] After the base station performs AFC processing in the demodulation pre-processing stage and AFC processing in the demodulation pre-processing stage on the data signal sent by the mobile station, the data signal still has a residual frequency offset, which causes the loss of demodulation performance and reduces the demodulation performance

Method used

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  • Frequency control method and device

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Embodiment 1

[0033] figure 2 It shows a schematic structural diagram of a communication device to which the frequency control method in this embodiment is applied. In the process of demodulation pre-processing and demodulation pre-processing, the AFC calculation module is respectively called to correct the frequency offset twice for the data to be demodulated. In the demodulation pre-processing After processing, the AFC calculation module is called to perform the third frequency offset correction by using the pilot frequency band.

[0034] image 3 A flow chart of the frequency control method in this embodiment is shown. See also figure 2 and image 3 , the example of this embodiment is described for the GSM network, but this example is not used to limit the present invention. The frequency control method provided in this embodiment includes the following steps:

[0035] Step S301: In the pre-demodulation process, use the training sequence segment in the data to be demodulated to ob...

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Abstract

The embodiment of the invention discloses a frequency control method and a frequency control device. The method comprises the following steps of: performing frequency offset correction twice on data to be demodulated according to a training sequence segment in the data to be demodulated; acquiring a third-time frequency offset correction signal for the data to be demodulated by utilizing a pilot in the data to be demodulated and an signal output by the frequency offset correction of the second time; and performing the frequency offset correction of the third time on the signal output by the frequency offset correction of the second time according to the third-time frequency offset correction signal. In the method and the device, the frequency offset correction of the third time is performed after the frequency offset correction is performed twice according to the training sequence segment, and residual frequency offset is further reduced.

Description

technical field [0001] The present invention relates to the technical field of communications, and more specifically, to a frequency control method and device. Background technique [0002] At present, high-speed transportation is rapidly becoming popular all over the world. The use of high-speed vehicles has brought great challenges to the existing mobile communication systems. One of the important aspects is that when the communication environment in which the mobile station is located becomes more and more complex, the strong Doppler frequency shift phenomenon caused by the high-speed movement of the mobile station makes there is a carrier frequency difference between the base station and the mobile station. The difference is the frequency deviation. [0003] For a cellular communication system in the prior art, such as Global System for Mobile Communications (GSM, Global System for Mobile Communications), its Random Access Channel (RACH, Random Access Channel) is used ...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02
Inventor 周熙陈浩
Owner HONOR DEVICE CO LTD