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Method for capturing downlink pilot time slot

A technology of pilot frequency slots and correlation calculations, which is applied to communication between multiple stations, electrical components, transmission systems, etc., can solve problems such as inaccurate correlation calculation windows, missynchronization, etc., and achieve easy access to the system and reduce The effect of the time to search the cell

Inactive Publication Date: 2008-07-02
SHENZHEN TCL IND RES INST
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Problems solved by technology

[0009] The purpose of the embodiments of the present invention is to provide a method for capturing downlink pilot time slots, which aims to solve the problem of incorrect synchronization caused by inaccurate correlation operation windows due to noise, intersymbol interference, etc. in the prior art

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  • Method for capturing downlink pilot time slot
  • Method for capturing downlink pilot time slot
  • Method for capturing downlink pilot time slot

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] Because the downlink synchronization code of TD-SCDMA repeatedly appears in the downlink pilot slot of each subframe, and the downlink synchronization codes in adjacent 2 subframes or 3 subframes have approximately the same intersymbol interference, so the downlink synchronization The sign decision output of the codes has a great similarity. At the same time, since the received basic training code in the TS0 time slot is unchanged in the same cell, the symbol decision output of the basic training code also has a great similarity.

[0033] The present invention determines the correlation ope...

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Abstract

The invention is applicable in a wireless communication field and provides a method for obtaining a time slot of a downlink pilot. The method comprises the following processes: received data of a sub frame is maintained; a researching window is set; according to the judgment similarity of specific code signs between nearby sub frames, a candidate position is obtained from the researching window; according to the candidate position, a corresponding relevant calculation window is positioned; relevant calculation is carried for the saved data of the sub frame and a known specific synchronization code of a downlink is carried out in a relevant calculation window; according to the relevant calculation, the time slot of the downlink pilot is obtained at a place where a peak value appears. The embodiment of the invention positions the relevant calculation window during obtaining the time slot of the downlink pilot by adopting the judgment similarity of signs between nearby sub frames of a basic training code for a TS0 time slot and the synchronization code of the downlink in a TD-SCDMA system, thus guaranteeing precisely obtaining the time slot of the downlink pilot and completing the researching process of a cell by a user terminal.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for capturing downlink pilot time slots during cell search in a Time Duplex-Synchronous Code Division Multiple Access (TD-SCDMA) system. Background technique [0002] The TD-SCDMA system has 32 downlink synchronization codes (SYNC-DL) with a length of 64 chips (chip), 128 scrambling codes, and 128 basic training codes (midamble). These codes are divided into 32 code groups. Each group of codes has 1 downlink synchronization code, 4 basic training codes and 4 scrambling codes, and different adjacent cells use different code groups. figure 1 Shows part of a subframe in the TD-SCDMA system, including time slot 0 (Time Slot0, TS0) and downlink pilot time slot (DwPTS). The downlink pilot time slot plays the role of pilot frequency and downlink synchronization. It consists of 64chips downlink synchronization code and 32chips protection segment (GP). The base ...

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Application Information

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IPC IPC(8): H04B7/26H04B1/707H04B1/7083
Inventor 周化雨
Owner SHENZHEN TCL IND RES INST
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