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A method and device for automatic frequency control

An automatic frequency control and equipment technology, applied in the field of communication, can solve the problems of high instantaneous load and large buffer space occupation, and achieve the effect of reducing instantaneous load and reducing channel delay

Active Publication Date: 2016-12-07
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the existing AFC solution, each user needs to cache 3slot data, which occupies a large amount of cache space; in addition, using the frequency offset value calculated from the cached 3slot data to correct the cached 3slot data not only consumes a higher instantaneous load , there is also a 3slot channel delay

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  • A method and device for automatic frequency control
  • A method and device for automatic frequency control
  • A method and device for automatic frequency control

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0023] The embodiment of the present invention is a method and device for automatic frequency control, which can be applied to the automatic frequency control application scene of message channel data in WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access), wherein, the message channel is the WCDMA system Part of the PRACH channel (Physical Random Access Channel, physical layer random access channel); the PRACH channel consists of p...

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Abstract

The invention discloses a method and device of automatic frequency control. The method of the automatic frequency control includes subjecting obtained data with time slots or symbols as divided units to cross product frequency discrimination to obtain values of the cross product frequency discrimination, accumulating the obtained values of the cross product frequency discrimination with prior values of the cross product frequency discrimination to obtain accumulated values of the cross product frequency discrimination; calculating to obtain frequency offset values of current subframe boundaries according to the accumulated values of the cross product frequency discrimination on subframe boundaries; subjecting data of the next subframe to frequency deviation correction and according to the frequency offset values. The invention also discloses the device of the automatic frequency control. According to the method and device of the automatic frequency control, both the instantaneous load and the channel delay can be reduced.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to an automatic frequency control method and equipment. Background technique [0002] At present, there are two kinds of frequency deviations in mobile communication: one is the natural frequency difference between the local oscillation frequencies of the base station and the mobile station; the other is caused by the Doppler frequency shift introduced by the movement of the mobile station frequency deviation. Both of these frequency deviations will cause channel fading, thereby affecting system performance. AFC (Automatic Frequency Control) is a technology used to eliminate frequency deviation. Using AFC technology, it can correct the received data by estimating the frequency deviation between the base station and the mobile station. Compensate for channel fading caused by frequency deviation. [0003] In the existing AFC scheme, each user is required to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/02
Inventor 张欣欣
Owner HUAWEI TECH CO LTD
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