Method and device for automatically controlling frequency in TD-SCDMA system

A TD-SCDMA, automatic frequency control technology, applied in transmission systems, electrical components, etc., can solve problems such as poor accuracy and affect tracking performance, and achieve the effect of simple implementation, satisfying system performance, and reducing resource occupation

Inactive Publication Date: 2010-03-10
ZTE CORP
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  • Claims
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Problems solved by technology

Since the acquisition and tracking of this method are realized by two units, the subsequent tracking performance is affected due to poor precision, that is, various problems of frequency discrimination accuracy, system performance and overhead considerations will be encountered.

Method used

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  • Method and device for automatically controlling frequency in TD-SCDMA system
  • Method and device for automatically controlling frequency in TD-SCDMA system
  • Method and device for automatically controlling frequency in TD-SCDMA system

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments.

[0034] Such as figure 2 As shown, it is a schematic diagram of the position of the automatic frequency control device in the UE system of the present invention. The signal received by the antenna is sent to the cell search module, the downlink synchronization tracking module and the automatic frequency control module of the present invention respectively after being passed through the matched filter at the receiving end. control device. The cell search module or the downlink synchronization tracking module provides multipath timing information to the automatic frequency control device, and the range of the paths is [-32, 48]chip. The automatic frequency control method of the present invention utilizes the Midamble code m(1) in the P-CCPCH channel or the SYNC_DL code in the DwPCH channel to calculate and combine the phase deviation ...

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Abstract

The invention relates to a method and a device for automatically controlling frequency in a TD-SCDMA system. The method comprises the following steps: firstly, respectively correlating and accumulating first half sections and second half sections of Midamble codes / SYNC_DL codes in input data on each path of a small area network and the first half sections and the second half sections of basic Midamble codes / SYNC_DL codes which are processed by conjugating and copying so as to obtain correlation results of the first half sections and the second half sections; next respectively carrying out conjugate multiplication on the correlation results to obtain correlation phase differences; then merging the phase differences of two paths of a cell; and finally carrying out moving average on a mergedphase difference to obtain an automatic frequency control result. The device comprises a correlation and segmented accumulation operation module, a time domain multiplication calculating module, a two-path merging module and a multi-subframe averaging module. The invention not only has accurate frequency discrimination, low hardware expenditure and flexible and smart design, but also can meet therequirement on performance of a system.

Description

technical field [0001] The invention relates to the field of wireless communication systems, in particular to an automatic frequency control method and device for a mobile station in a TD-SCDMA system. Background technique [0002] In the TD-SCDMA system, the base station and the terminal both transmit and receive at the nominal carrier frequency. Due to device level limitations, there will be a certain deviation between the actual transmitted and received frequencies. The TD-SCDMA system requires the base station's carrier frequency error to be less than 0.05PPM, and the user's carrier frequency error to be less than 0.1PPM. At the base station (BS), the frequency accuracy of the oscillator can meet the requirements due to the relatively small limitations of temperature, volume, power consumption, cost, etc. The frequency accuracy of the crystal oscillator usually does not meet the standard requirements, this paper will especially focus on the automatic frequency control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
Inventor 宋春玲
Owner ZTE CORP
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