Method for searching downlink pilot frequency slot in TD-SCDMA system

A technology of 1. TD-SCDMA and pilot frequency slots, applied in transmission systems, code division multiplexing systems, electrical components, etc., can solve problems such as missed detection, improve accuracy, reduce the probability of false reports, Effect of Noise Suppression

Active Publication Date: 2008-01-16
SANECHIPS TECH CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for searching downlink pilot time slots in a cell search method, to overcome the problem of missed detection when the signal

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  • Method for searching downlink pilot frequency slot in TD-SCDMA system
  • Method for searching downlink pilot frequency slot in TD-SCDMA system
  • Method for searching downlink pilot frequency slot in TD-SCDMA system

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Embodiment Construction

[0023] The specific implementation manner of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] As shown in Figure 1, it is a power characteristic diagram of the downlink pilot time slot of the TD-SCDMA system. According to the frame structure of TD-SCDMA, there is a guard interval of 32 chips on the left side of the downlink synchronization code, a guard interval of 96 chips on the right side, and the downlink synchronization code itself is 64 chips.

[0025] Figure 2 is a structural diagram of the 0th time slot and the downlink pilot time slot in the TD-SCDMA system. Each downlink synchronization code in the TD-SCDMA system corresponds to 4 intermediate codes, and the positional relationship between them is shown in Figure 2. Due to different measurement times and the influence of frequency offset, the corresponding relationship of the position may deviate slightly, which can be judged by setting the posit...

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Abstract

A method for searching downlink pilot time slot in TD-SCDMA system is characterized in that: calculate position power eigenvalue of downlink pilot time slot; search power peak eigenvalue in the power eigenvalue and generate a power peak eigenvalue table; repeatedly detect power peak eigenvalue table by default times and export peak eigenvalue position information from high to low; detect downlink synchronization code and 0 time slot middle code and the position information thereof according to peak eigenvalue position information and confirm searching result by the position information of downlink synchronization code and 0 time slot middle code. By the method, the character of the right position can be detected through the expanded peak eigenvalue table as long as the character of the right position is not buried in noise even in low SNR so the validity of cell synchronization get improved greatly and the problem of detection missing in low SNR gets solved effectively.

Description

technical field [0001] The present invention relates to a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) communication system for a mobile user terminal device to perform an initial cell search and a method for obtaining a synchronization position, in particular to a method for searching a downlink guide during the cell search process. frequency slot method. Background technique [0002] In a mobile communication system, after initial power-on, a user terminal needs to search for possible cells and select a suitable cell to log in. This process is called cell search. In the TD-SCDMA communication system, the cell search process is generally divided into four steps: the first step is to search the downlink pilot time slot; the second step is to identify the scrambling code and midamble; the third step is to control the multiframe synchronization; Step four, read the broadcast channel. [0003] In t...

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Application Information

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IPC IPC(8): H04B1/707H04J13/02H04B1/7073
Inventor 曾文琪
Owner SANECHIPS TECH CO LTD
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