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Relative method for primary synchronizing in CDMA mobile communication system

A mobile communication system, code division multiple access technology, applied in the field of wireless communication systems, can solve problems such as performance loss, large frequency deviation, and initial synchronization cannot be completed normally

Active Publication Date: 2008-03-26
XUANPU INDUSTRY CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

In particular, during the initial synchronization process after the UE is turned on, when the automatic frequency correction (AFC) loop has not yet started, the frequency deviation is also large. In this case, the related methods in the initial synchronization need to be carefully carried out. design, otherwise the frequency deviation will cause a certain performance loss, and may even make the initial synchronization impossible to complete normally

Method used

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  • Relative method for primary synchronizing in CDMA mobile communication system
  • Relative method for primary synchronizing in CDMA mobile communication system
  • Relative method for primary synchronizing in CDMA mobile communication system

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Experimental program
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Embodiment Construction

[0029] An embodiment of the present invention will be described below with reference to FIGS. 3 to 6 .

[0030] The correlator correlates the data sequence received by the UE with the synchronization code generated by the local synchronization code generator according to one of the following correlation methods, and obtains the correlation sequence C, which is output to the subsequent first peak detector for peak detection .

[0031] Approach 1 ("full correlation"):

[0032] Set the received signal sampling sequence in one frame as r=(r 1 , r 2 ,...,r N ), N is the sequence length. And assume that the ADC uses a two-fold oversampling. The kth synchronization code sequence is s k = ( s 1 k , s 2 k , . . . , ...

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Abstract

Under major initial frequency deviation, the disclosed method is able to keep preferable correlativity so as to reduce influence on initial synchronous performance from initial frequency deviation. The method includes following steps: 'partial correlation' step divides synchronous codes into several small segments, and correlation is carried out between codes of each segment and corresponding received data sample; in 'combination' step, partial correlated output of each segment is merged according to certain mode including 'square merging', 'difference merging' etc.

Description

technical field [0001] The present invention relates to a related method of a wireless communication system, in particular to a related method for initial synchronization (Initial Synchronization) used in a Code Division Multiple Access (CDMA) mobile communication system. Background technique [0002] In a CDMA system, after the user equipment (UE) is turned on, it needs to complete downlink synchronization with the base station of the cell, and then read the broadcast information of the cell. Generally, the base station adds a beacon signal in the downlink, and the UE realizes downlink synchronization acquisition by detecting the position of the beacon. In the Universal Mobile Telecommunications System (UMTS) Frequency Division Duplex (FDD) standard and the High Chip Rate Time Division Duplex (HCR-TDD) standard, the base station uses a public The beacon signal is called the primary synchronization code. The Time Division Synchronous Code Division Multiple Access (TD-SCDMA...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04B7/26
Inventor 谢一宁冉晓龙
Owner XUANPU INDUSTRY CO LTD
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