CN104954995A - Synchronization word free speech frame synchronization method in DMR/PDT system - Google Patents
Synchronization word free speech frame synchronization method in DMR/PDT system Download PDFInfo
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- CN104954995A CN104954995A CN201510197146.4A CN201510197146A CN104954995A CN 104954995 A CN104954995 A CN 104954995A CN 201510197146 A CN201510197146 A CN 201510197146A CN 104954995 A CN104954995 A CN 104954995A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
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
The invention belongs to wireless communication field, particularly relate to the synchronous method without synchronization character speech frame in DMR/PDT digital clustering communication system.
Background technology
DMR/PDT system is the Digital Clustering wireless access system meeting Chinese Digital cluster national standard.System is applicable to, in industry wireless private network, specifically comprise track traffic, electric power, harbour, airport, government, army etc.
The voice superframes structure specified in standard is voice A, voice B, voice C, voice D, voice E, voice F six speech frames.Wherein voice A frame is with synchronization character, is convenient to by the simultaneous operation of coherent detection achieve frame.And voice B to voice F embeds signaling, colour coding and backward signaling to carry; not containing synchronization character; achieve frame simultaneous operation cannot be carried out by coherent detection; conventional process means are sync bits that acquiescence uses voice A frame; but this mode often can cause the step-out without synchronization character speech frame under fading channel, therefore the frame synchronization how completed to high efficient and reliable without synchronization character speech frame becomes a problem.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of frame synchornization method without synchronization character speech frame, makes receiver when using without synchronization character, can accurately judge the frame synchronization position of speech frame, reduces the error rate of speech frame.The core concept of the inventive method is, sliding window joint-detection is carried out to the embedding signaling of carrying without synchronization character speech frame and color code information, complete the recovery without synchronization character speech frame structure according to testing result, to overcome under low signal-to-noise ratio and deep fade condition the synchronous detection instability problem without synchronization character speech frame, increased substantially the sensitivity of receiver.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions: without the synchronous method of synchronization character speech frame in a kind of DMR/PDT system, comprise the following steps:
1) coherent detection is carried out to the synchronization character of voice A frame, obtain correlation;
2) judge whether correlation exceedes detection threshold, if exceed detection threshold, then perform step 3); If do not exceed detection threshold, then go to step 1);
3) voice A frame carried out to frame structure recovery and extracts speech data, the sync bit of storaged voice A frame in time slot window, and starting speech frame counter;
4) according to the sync bit of voice A frame give respectively set identical sliding window with or without synchronization character speech frame;
5) quadratic residue code check is carried out one by one to the current embedding signaling EMB PDU without synchronization character speech frame in all positions in sliding window, obtains check value;
6) judge whether verification is passed through according to check value, pass through if there is position to verify, then stop slip sliding window and store current sliding position, this sliding position, as the current frame synchronization position without synchronization character speech frame, proceeds to step 8); If all positions all not by verification, then perform step 7);
7) Soft Inform ation related operation is carried out to the colour coding of pre-stored in all positions in sliding window, obtain the colour coding correlation of all positions in sliding window, obtain wherein maximum colour coding correlation and store the sliding position at maximum colour coding correlation place, this sliding position, as the current frame synchronization position without synchronization character speech frame, performs step 8);
8) recover according to the frame synchronization position without synchronization character speech frame stored without synchronization character speech frame structure and extract speech data, speech frame counter is from increasing;
9) judge whether voice superframes terminates according to the value of speech frame counter, if terminate, then speech frame counter and sliding window are all reset and proceed to step 1); Otherwise, in all positions of sliding window, one by one quadratic residue code check is carried out to the next embedding signaling EMB PDU without synchronization character speech frame, obtains this check value without synchronization character speech frame, and proceed to step 6).
Wherein, described the speech frame with or without synchronization character is specially voice B frame, voice C frame, voice D frame, voice E frame and voice F frame.
Wherein, the method to set up of described sliding window is: get a length from the position identical with the sync bit of voice A frame without synchronization character speech frame and be not more than sliding window without synchronization character speech frame time slot length of window.
Wherein, when quadratic residue code check is carried out one by one to the embedding signaling EMB PDU without synchronization character speech frame in described all positions in sliding window, first quadratic residue code check is carried out to the position identical with the sync bit of voice A frame without synchronization character speech frame, the verification of this position not by time to slide again sliding window to carrying out quadratic residue code check one by one except other position identical with the sync bit of voice A frame in sliding window.
The advantage that the present invention compares background technology is:
Compared with prior art, disclosed by the invention based on embed signaling and colour coding joint-detection can be easier without synchronization character speech frame synchronization detecting method the Frame Synchronization Test realized without synchronization character speech frame in DMR and PDT voice superframes.This kind of mode to overcome under low signal-to-noise ratio and deep fade condition the synchronous detection instability problem without synchronization character speech frame, substantially increases the sensitivity of receiver.
Accompanying drawing explanation
Fig. 1 is speech detection state transition diagram.
Fig. 2 is the voice A frame overhaul flow chart of band synchronization character of the present invention.
Fig. 3 is the overhaul flow chart of the voice B-F frame without synchronization character of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the method for the invention is described in further detail.
Without a synchronous method for synchronization character speech frame in DMR/PDT system, comprise the following steps:
1) coherent detection is carried out to the synchronization character of voice A frame, obtain correlation;
2) judge whether correlation exceedes detection threshold, if exceed detection threshold, then perform step 3); If do not exceed detection threshold, then go to step 1);
3) voice A frame carried out to frame structure recovery and extracts speech data, the sync bit of storaged voice A frame in time slot window, and starting speech frame counter;
4) according to the sync bit of voice A frame give respectively set identical sliding window with or without synchronization character speech frame;
Fig. 1 is speech detection state transition diagram.Speech detection state is divided into band synchronization character voice A frame detected state and without synchronization character voice B-F frame detected state two kinds.When voice superframes not detected, be in the detected state of voice A frame, once voice A frame be detected, the voice B-F frame detected state without synchronization character can be switched to.
Fig. 2 is the voice A frame testing process of band synchronization character.The synchronizing sequence that each time slot can carry out voice A frame carries out coherent detection, and correlation exceedes detection threshold, then think and voice A frame detected, after carrying out frame structure recovery extraction speech data, then stores the sync bit in current time slots to voice A frame.After voice A frame being detected, after acquiescence, extended meeting is with voice B-F frame, starts speech frame technology device, and arranges the speech frame detection sliding window of subsequent voice B-F frame in time slot, for the follow-up speech frame without synchronization character detects ready, be switched to the Detection and Extraction state of voice B-F frame.
The method to set up of sliding window is: get a length from the position identical with the sync bit of voice A frame without synchronization character speech frame and be not more than sliding window without synchronization character speech frame time slot length of window.
5) quadratic residue code check is carried out one by one to the current embedding signaling EMB PDU without synchronization character speech frame in all positions in sliding window, obtains check value;
First this step carries out quadratic residue code check to the position identical with the sync bit of voice A frame without synchronization character speech frame, the verification of this position not by time to slide again sliding window to carrying out quadratic residue code check one by one except other position identical with the sync bit of voice A frame in sliding window.
6) judge whether verification is passed through according to check value, pass through if there is position to verify, then stop slip sliding window and store current sliding position, this sliding position, as the current frame synchronization position without synchronization character speech frame, proceeds to step 8); If all positions all not by verification, then perform step 7);
7) Soft Inform ation related operation is carried out to the colour coding of pre-stored in all positions in sliding window, obtain the colour coding correlation of all positions in sliding window, obtain wherein maximum colour coding correlation and store the sliding position at maximum colour coding correlation place, this sliding position, as the current frame synchronization position without synchronization character speech frame, performs step 8);
8) recover according to the frame synchronization position without synchronization character speech frame stored without synchronization character speech frame structure and extract speech data, speech frame counter is from increasing;
9) judge whether voice superframes terminates according to the value of speech frame counter, if terminate, then speech frame counter and sliding window are all reset and proceed to step 1); Otherwise, in all positions of sliding window, one by one quadratic residue code check is carried out to the next embedding signaling EMB PDU without synchronization character speech frame, obtains this check value without synchronization character speech frame, and proceed to step 6).
Fig. 3 is the testing process of the voice B-F without synchronization character.In corresponding business time-slot, in speech frame sliding window, carry out the quadratic residue code check embedding signaling EMB PDU.In sliding window, the sync bit of first-selected voice A frame verifies, and secondly attempts other position in sliding window.If upchecked in sliding window, then stop slip sliding window and store the position that verifies and pass through as sync bit, if all positions verification in sliding window is not all passed through, then in sliding window, carry out colour coding related operation, using position maximum for correlation as sync bit.Adopt frame synchronization position obtained above to carry out recovering without the frame structure of synchronization character speech frame, extract speech data, and one is added to speech frame technology device.Judge whether voice superframes terminates by speech frame technology device, if terminated, then remove speech frame counter and sliding window, be switched to and detect voice A frame state; If do not terminated, then proceed the Detection and Extraction without synchronization character speech frame.
In sum, these are only preferred application example of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. in DMR/PDT system without a synchronous method for synchronization character speech frame, it is characterized in that comprising the following steps:
1) coherent detection is carried out to the synchronization character of voice A frame, obtain correlation;
2) judge whether correlation exceedes detection threshold, if exceed detection threshold, then perform step 3); If do not exceed detection threshold, then go to step 1);
3) voice A frame carried out to frame structure recovery and extracts speech data, the sync bit of storaged voice A frame in time slot window, and starting speech frame counter;
4) according to the sync bit of voice A frame give respectively set identical sliding window with or without synchronization character speech frame;
5) quadratic residue code check is carried out one by one to the current embedding signaling EMB PDU without synchronization character speech frame in all positions in sliding window, obtains check value;
6) judge whether verification is passed through according to check value, pass through if there is position to verify, then stop slip sliding window and store current sliding position, this sliding position, as the current frame synchronization position without synchronization character speech frame, proceeds to step 8); If all positions all not by verification, then perform step 7);
7) Soft Inform ation related operation is carried out to the colour coding of pre-stored in all positions in sliding window, obtain the colour coding correlation of all positions in sliding window, obtain wherein maximum colour coding correlation and store the sliding position at maximum colour coding correlation place, this sliding position, as the current frame synchronization position without synchronization character speech frame, performs step 8);
8) recover according to the frame synchronization position without synchronization character speech frame stored without synchronization character speech frame structure and extract speech data, speech frame counter is from increasing;
9) judge whether voice superframes terminates according to the value of speech frame counter, if terminate, then speech frame counter and sliding window are all reset and proceed to step 1); Otherwise, in all positions of sliding window, one by one quadratic residue code check is carried out to the next embedding signaling EMB PDU without synchronization character speech frame, obtains this check value without synchronization character speech frame, and proceed to step 6).
2. in a kind of DMR/PDT system according to claim 1 without the synchronous method of synchronization character speech frame, it is characterized in that: described the speech frame with or without synchronization character is specially voice B frame, voice C frame, voice D frame, voice E frame and voice F frame.
3. in a kind of DMR/PDT system according to claim 1 without the synchronous method of synchronization character speech frame, it is characterized in that: the method to set up of described sliding window is: get a length from the position identical with the sync bit of voice A frame without synchronization character speech frame and be not more than sliding window without synchronization character speech frame time slot length of window.
4. in a kind of DMR/PDT system according to claim 1 without the synchronous method of synchronization character speech frame, it is characterized in that: when quadratic residue code check is carried out one by one to the embedding signaling EMB PDU without synchronization character speech frame in described all positions in sliding window, first quadratic residue code check is carried out to the position identical with the sync bit of voice A frame without synchronization character speech frame, the verification of this position not by time to slide again sliding window to carrying out quadratic residue code check one by one except other position identical with the sync bit of voice A frame in sliding window.
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| CN106788959A (en) * | 2016-12-26 | 2017-05-31 | 成都三零瑞通移动通信有限公司 | A kind of PDT group systems encrypt voice synchronous method |
| CN111212452A (en) * | 2020-01-13 | 2020-05-29 | 海能达通信股份有限公司 | Handover method, communication system, terminal and storage device for voice communication |
| CN112737633A (en) * | 2020-12-25 | 2021-04-30 | 河北远东通信系统工程有限公司 | Frequency hopping group call delayed adding method suitable for PDT/DMR |
| CN113037456A (en) * | 2019-12-24 | 2021-06-25 | 海能达通信股份有限公司 | Voice synchronization method, device and system and related equipment |
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