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Method and apparatus for initial synchronization in CDMA mobile communication system

A mobile communication system, code division multiple access technology, applied in the field of initial synchronization method and device of code division multiple access mobile communication system, can solve the problems of increased synchronization delay, large storage capacity, etc.

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Problems solved by technology

In order to ensure the detection performance, this method divides the correlation sequence into more than 800 segments, each segment stores a correlation value, and the storage capacity is still relatively large
Another two-step detection method also increases the synchronization delay

Method used

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  • Method and apparatus for initial synchronization in CDMA mobile communication system
  • Method and apparatus for initial synchronization in CDMA mobile communication system
  • Method and apparatus for initial synchronization in CDMA mobile communication system

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Embodiment Construction

[0041] based on the following Figure 3 ~ Figure 6 , illustrating an embodiment of the present invention.

[0042] image 3 It shows the flow of the initial synchronization method of the CDMA mobile communication system proposed by the present invention. The method comprises the following steps:

[0043] 1. Related steps (step S31): The data sequence received by the UE is correlated with the synchronization code generated by the local synchronization code generator:

[0044] Let the receiving sequence be r=(r 1 , r 2 ,...,r N ), N is the sequence length. The kth synchronization sequence is s k = ( s 1 k , s 2 k , . . . , s M k ) , ...

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Abstract

The invention is an initially synchronizing method and device for CDMA mobile communication system, and the method contains the steps: relating data sequence received by a user with K synchronous codes generated by local synchronous code generator and obtaining K related sequences; dividing each related sequence into p continuous related data segments at length of q, detecting the front g maximum related values in each related data segment and their position information; combining the maximum values in the adjacent frames according to the position, and storing these combined related values and corresponding position information in a memory; completing the combination of R continuous frames and then searching the maximum peak value Cmax in all the K related value sequences stored in the memory; outputting corresponding sequence number and position of synchronous code to the Cmax. It can assure good synchronous property a smaller processing time delay and simultaneously remarkably reduce the complexity and storage demand in the synchronizing course.

Description

technical field [0001] The present invention relates to a synchronization method and device for a wireless communication system, in particular to an initial synchronization method and device for 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) mobile c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7073H04B7/26
Inventor 李烜冉晓龙
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