Method of quickly locking and judging start point applicable to DMR (Data Management Routines)

A fast-locking and starting-point technology, applied in two-party line system stations, digital transmission systems, electrical components, etc., can solve the problems of high computing overhead, large resources, occupation, etc., to improve work efficiency, save system resources, reduce The effect of calculation volume

Inactive Publication Date: 2014-09-10
无锡交大联云科技有限公司
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  • Abstract
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Problems solved by technology

In the traditional processing method, the collected signal is directly correlated with the local code, and the synchronization type and the starting position of the data are determined by looking for the correlation peak. The correlation calculation will take a lot of multiplication and accumulation operations and take up a lot of resources.
[0003] To sum up, at present, the calculation overhead of time synchronization of digital walkie-talkies is too large

Method used

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  • Method of quickly locking and judging start point applicable to DMR (Data Management Routines)
  • Method of quickly locking and judging start point applicable to DMR (Data Management Routines)

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Before channel synchronization is achieved, the starting position of the synchronization code cannot be determined, that is, the specific position of the required effective information cannot be known, and the data stream is input sequentially, so more than one frame of data needs to be collected for synchronization code detection. After the synchronization is successful , to process and analyze the valid data, and if it fails, it needs to continuously make synchronization judgments, which will inevitably involve frequent synchronization code search processes. Such as figure 1 The schematic diagram of the format of the DMR frame carrying the synchronization code is shown. Each frame of data contains 30ms of data, including 27.5ms of frame data and a guard interval of 2.5ms. In this embodiment, a judgment is made every time 40ms of d...

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Abstract

The invention discloses a method of quickly locking and judging a start point applicable to a DMR (Digital Mobile Radio). A start point and a synchronous type of a synchronous code can be quickly determined by performing a sliding window algorithm on data sampled by an AD (Access Device) at a receiving side. According to the method, the multiply-accumulate calculation cannot be needed in a traditional method, therefore, the calculated amount can be massively cut down, system resources can be saved, and the working efficiency of the system can be improved.

Description

technical field [0001] The invention belongs to the field of digital trunking communication standard digital walkie-talkies, and in particular relates to a method for quickly locking the starting point of judgment suitable for DMR. Background technique [0002] With the development of radio communication technology, the improvement of people's requirements for wireless communication quality and the increasing demand for spectrum resources, digital walkie-talkies have attracted more and more attention. A digital walkie-talkie is a walkie-talkie designed with digital technology. The digital walkie-talkie digitizes the voice signal and transmits it in the form of digital code, that is to say, all the modulations on the transmission frequency of the walkie-talkie are digital. Digital walkie-talkie DMR standard can make more effective use of spectrum resources, load more users on a designated channel such as 12.5KHZ, and improve spectrum utilization. Because digital communicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04Q5/24
Inventor 韦祥云黄金伟杨震曹婷婷王斌顾丽洁
Owner 无锡交大联云科技有限公司
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