Synchronization word free speech frame synchronization method in DMR/PDT system

A voice frame and synchronization word technology, which is applied in the direction of synchronization devices, wireless communications, electrical components, etc., can solve the problems of inability to operate frame synchronization, voice frame out of sync without synchronization words, etc., to overcome the problem of unstable synchronization detection and improve sensitivity Effect

Active Publication Date: 2015-09-30
HEBEI FAREAST COMM SYST ENG
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Problems solved by technology

In order to carry embedded signaling, color code and reverse signaling, voice B to voice F do not contain synchronization words, and frame synchronization cannot be realized through correlation detection. The common processing method is to use the synchronization position of voice A frame by default, but This method often causes out-of-synchronization of speech frames without sync words in fading channels, so how to efficiently and reliably complete the frame synchronization of speech frames without sync words becomes a problem

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  • Synchronization word free speech frame synchronization method in DMR/PDT system
  • Synchronization word free speech frame synchronization method in DMR/PDT system
  • Synchronization word free speech frame synchronization method in DMR/PDT system

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Embodiment Construction

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

[0024] A kind of synchronous method without sync word voice frame in DMR / PDT system, comprises the following steps:

[0025] 1) Correlation detection is carried out to the synchronous word of speech A frame, obtains correlation value;

[0026] 2) judge whether the correlation value exceeds the detection threshold, if it exceeds the detection threshold, then perform step 3); if it does not exceed the detection threshold, then turn to step 1);

[0027] 3) carry out frame structure recovery to voice A frame and extract voice data, store the synchronous position of voice A frame in the time slot window, and start the voice frame counter;

[0028] 4) according to the synchronous position of speech A frame, set identical sliding window to all speech frames without synchronizing words respectively;

[0029] figure 1 It is the speech detection state ...

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Abstract

The invention discloses a synchronization word free speech frame synchronization method in a DMR / PDT system, especially to the synchronization word free speech frame synchronization method in a digital cluster communication system, and belongs to the field of wireless communication. In the DMR / PDT system, a verification result of signaling EMB PDT and a color code related operation manner are embedded to synchronize synchronization word free speech frames, the structure of the synchronization word free speech frames is recovered, the problems in synchronous detection of the synchronization word free speech frames under the low signal to noise ratio and deep fading conditions are solved, and the sensitivity of the receiver is greatly improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for synchronizing voice frames without synchronization words in a DMR / PDT digital trunking communication system. Background technique [0002] DMR / PDT system is a digital trunking wireless access system that conforms to the national standard of China's digital trunking. The system is suitable for industrial wireless private networks, including rail transit, electric power, ports, airports, government, military, etc. [0003] The speech superframe structure specified in the standard is six speech frames of speech A, speech B, speech C, speech D, speech E, and speech F. Among them, the voice A frame has a synchronization word, which is convenient for realizing frame synchronization operation through correlation detection. In order to carry embedded signaling, color code and reverse signaling, voice B to voice F do not contain synchronization words, and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04W56/00
CPCH04W4/06H04W56/003
Inventor 李鹏付志兵张墨渊杜义浩司雷魏永利
Owner HEBEI FAREAST COMM SYST ENG
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