Method and device for realizing automatic frequency control

A technology of automatic frequency control and control part, applied in radio transmission systems, electrical components, transmission systems, etc., can solve the problems of reducing frequency offset control accuracy, wasting hardware resources, increasing hardware overhead, etc., to improve offset correction accuracy and save money. Hardware resources, the effect of improving control accuracy

Active Publication Date: 2006-11-08
HUAWEI TECH CO LTD
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Problems solved by technology

[0006] From the description of Method 1, it can be seen that Method 1 has the following disadvantages: First, because the frequency offset estimation is realized by using the data in the preamble, and limited by the inherent length of the preamble data, the accuracy of the frequency offset estimation is poor, and the fixed The length is 2 time slots with a total of 4096 chips; second, in the preamble, due to the introduction of the frequency offset estimation process before the frequency offset correction, a large amount of interpolation and filtered data needs to be stored, which increases the complexity of AFC and hardware storage overhead , wasting hardware resources
[0009] From the description of Method 2, Method 2 has the following disadvantages: First, ...

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  • Method and device for realizing automatic frequency control
  • Method and device for realizing automatic frequency control

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Embodiment Construction

[0064] The core idea of ​​the present invention is: carry out multi-path search through the preamble part and message part of channel, obtain multi-path information, use the obtained multi-path information to carry out control part despreading and data part one-time despreading respectively, obtain control part information and Data part information, and according to the preset granularity, perform frequency offset estimation on the despread control part information to obtain frequency offset information; use the frequency offset information to perform frequency deviation correction on the despread control part information and data part information , to achieve AFC.

[0065] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0066] Taking PRACH in WCDMA system as an example, Figure 3a It is a sch...

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Abstract

This invention discloses a method for realizing AFC including: carrying out multi-path search by the precursor part and the message part of a channel to get multi-path information to be used to de-spread the control part and the data part to get information of the control part and the data part then to carry out frequency deviation estimation to the de-spread information of the control part to get the deviation information, then carrying out frequency deviation correction to the de-spread information of the control part and the data part by the deviation frequency to realize AFC, a device for realizing automatic frequency control is also disclosed.

Description

technical field [0001] The present invention relates to automatic frequency control (AFC, Automatic Frequency Control) technology, especially a method and device for realizing automatic frequency control. Background technique [0002] In a wireless communication system, affected by the stability and accuracy of the local crystal oscillator of the user equipment (UE) and the Doppler frequency shift phenomenon caused by the movement of the UE, there is a carrier frequency difference between the base station and the UE, namely frequency offset. Due to the existence of frequency offset, the coherent detection performance of the uplink and downlink is greatly reduced, and even the UE cannot access normally. Therefore, the frequency offset must be controlled to eliminate the negative impact of the frequency offset. At present, the method of effectively controlling the frequency offset is called AFC. The principle of AFC is to estimate the frequency offset of the signal, and then ...

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Application Information

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IPC IPC(8): H04B1/711H04B7/01
Inventor 王峰
Owner HUAWEI TECH CO LTD
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