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Cell search timing synchronization method

A technology of timing synchronization and cell search, which is applied in the field of communication, can solve problems such as timing errors and inability to complete cell search, and achieve the effect of accurate timing

Inactive Publication Date: 2013-01-02
POTEVIO INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the traditional cross-correlation absolute value detection method is used for timing synchronization, the peak value of the downlink signal cross-correlation cannot exceed the value of the uplink interference signal, which will cause timing errors and cell search cannot be completed

Method used

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] In the embodiment of the present invention, the peak-to-average ratio after cross-correlation between the received signal and the main synchronization signal is used as the basis for judging the timing synchronization position. After the cross-correlation operation, the sequence obtained by the cross-correlation operation is segmented, the peak-to-average ratio of the sequence segment is calculated, and then the maximum peak-to-average ratio is selected to determine the timing synchronization position. Due to the strong autocorrelation of the main synchronization signal, although the downlink signal is weak, the peak-to-average ratio is still larger than that of the uplink interference signal. It has accurate timing, especially...

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Abstract

A cell search timing synchronization method includes: performing cross-correlation operation for main synchronous signals kept by UE (user equipment) and received signals so as to obtain correlation sequences; segmenting the correlation sequences to obtain sequence segments corresponding to the correlation sequences; and computing a peak-to-average value of the sequence segment corresponding to each correlation sequence, and obtaining a timing synchronization position according to the maximum peak-to-average value of the correlation sequences. After application of the cell search timing synchronization method in the embodiment, cell search is accurately timed and completed in the presence of strong uplink interference signals.

Description

technical field [0001] The present invention relates to the technical field of communications, and more specifically, to a method for cell search timing synchronization. Background technique [0002] A user terminal (UE) needs to perform a cell search when it is turned on or transferred from a signal blind area to a base station coverage area. The cell search process is completed by means of the first synchronization signal and the second synchronization signal sent by the base station. Firstly, the UE uses the first synchronization signal to perform symbol timing estimation and sector ID detection, and then uses the timing estimation result and sector ID to perform rough frequency offset estimation. Timing estimation is to obtain the maximum value through the cross-correlation operation between the primary synchronization signal saved by the local UE and the received signal, and the timing synchronization position is obtained from the maximum value. Finally, the first syn...

Claims

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Application Information

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IPC IPC(8): H04W48/16H04W56/00
Inventor 冯绍鹏张际
Owner POTEVIO INFORMATION TECH
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