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Method for scrambling and descrambling assistant synchronous channel sequence in a down synchronous system

A secondary synchronization channel and synchronization system technology, applied in the field of downlink synchronization systems, to reduce requirements, reduce collision probability, and reduce computational complexity

Inactive Publication Date: 2012-06-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] At this time, the method of using cross-correlation with the local copy sequence to find the peak value can no longer correctly determine S 1 decoding

Method used

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  • Method for scrambling and descrambling assistant synchronous channel sequence in a down synchronous system
  • Method for scrambling and descrambling assistant synchronous channel sequence in a down synchronous system
  • Method for scrambling and descrambling assistant synchronous channel sequence in a down synchronous system

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Embodiment Construction

[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0072] figure 1 It is a schematic diagram of a frame structure of a downlink synchronization channel. The PSCH sequence and the SSCH sequence are sent every 5ms, and are respectively located in the 7th and 6th symbols of the first subframe. Since the positions of the PSCH sequence and the SSCH sequence are fixed, when the timing detection of the PSCH sequence is completed, we can easily extract the SSCH sequence from the previous symbol.

[0073] For the synchronization channel in the downlink synchronization system in the present invention, for the SSCH sequence composed of short codes with a length of N, select a specific row / column in the FFT matrix with a length of N as the scrambling code sequence of the SSCH sequence, and use this The scrambling code sequence scrambles the SSCH sequence.

[0074] Such as figure 2 As shown,...

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Abstract

The invention discloses a method for scrambling and descrambling a secondary synchronous channel sequence in a downlink synchronization system. In the downlink synchronization system, as for the secondary synchronous channel sequence composed of short codes with the length being N, a specific row / line in a fast Fourier transformation matrix with the selecting length being N is selected as a scrambling sequence of the secondary synchronous channel sequence, and the secondary synchronous channel sequence is scrambled by using the scrambling sequence. Compared with the prior art, the method reduces the collision probability of an SSCH sequence in a target cell and a SSCH sequence in an adjacent cell.

Description

technical field [0001] The present invention relates to a downlink synchronization system of wireless communication, in particular to a method for scrambling and descrambling a secondary synchronization channel sequence in the downlink synchronization system. Background technique [0002] The downlink synchronization system of wireless communication is mainly used for cell search. The purpose of cell search is to obtain timing and other relevant cell information. A common cell search method is to divide the synchronization channel into two parts: primary synchronization channel (PSCH, Primary Synchronization Channel) and secondary synchronization channel (SSCH, Secondary Synchronization Channel), and then realize cell search by detecting these two channels. The primary synchronization channel sequence generally carries cell identification code (Cell Id) information, that is, the primary synchronization channel sequence and the cell have a one-to-one correspondence relations...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B1/7073
Inventor 夏树强梁春丽杨扬
Owner ZTE CORP