CN104038247A - Method for rapidly receiving data and matched filtering applicable to DMR (Digital Mobile Radio) - Google Patents
Method for rapidly receiving data and matched filtering applicable to DMR (Digital Mobile Radio) Download PDFInfo
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- CN104038247A CN104038247A CN201410269295.2A CN201410269295A CN104038247A CN 104038247 A CN104038247 A CN 104038247A CN 201410269295 A CN201410269295 A CN 201410269295A CN 104038247 A CN104038247 A CN 104038247A
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Abstract
The invention discloses a method for rapidly receiving data and matched filtering applicable to a DMR (Digital Mobile Radio). The method comprises the following steps: firstly, sampling and placing 2304 data into a 384*6 annular array by an AD (Access Device); secondly, taking four successive groups of 384 data every time, assigning the data to an intermediate variable and then shifting the convoluted data after performing convolution operation on those data through a designed square root raised cosine filter in advance, and finally obtaining a final matched output. According to the method, the data acquired by the continuous AD can be rapidly processed, the matched filtering can be performed quickly, and the noise of a system can be filtrated out, therefore, the method is beneficial for the system to rapidly lock synchronous codes, so as to recover the data more quickly and accurately.
Description
Technical field
The invention belongs to digital mobile communication system field, particularly a kind of high-speed receiving data of DMR and method of matched filtering of being applicable to.
Background technology
Private wireless communication system (intercom) is the comand way using early, and it is a kind of mobile communication system for group's dispatch control communication, also has up to now application very widely.An important branch as radio communication, all users that the available channel that this system has can be system share, there is automatic selective channel function, it is the carrier of resource-sharing, except possessing the phonetic function of common wireless communications, also emphasize the command scheduling functions such as group call, fast splicing.In government, logistics, dispatch control mechanism, bringing into play vital effect.
At present, exist a large amount of analog-interphones on market, the use of analog-interphone is seen in place by you can be often at the restaurant, hospital etc.Development along with radio communication technology, the raising that people require radio communication quality and the shortage day by day of frequency spectrum resource, in addition private wireless communication system is increasing on the impact of the special user colonies such as government, logistics, dispatch control mechanism, they improve constantly for the requirement of connecting time, reliability and the fail safe of communication network, simulation private wireless communication system can not meet social demand far away, in order to meet the requirement of user Geng Gao, need to carry out digitlization to analog-interphone.
Digital private wireless communication system has many good qualities: the first, and digital handset system can be utilized Radio Spectrum Resource more efficiently.Such as or each channel of traditional analog intercom needs the channel width of 12.5kHz 25kHz, and existing digital handset only needs the channel width of 6.25kHz, and channel capacity has just improved 2 to 4 times like this, effectively improves the availability of frequency spectrum.The second, digital handset system can provide speech and abundant data service, and traditional simulation can only provide simple simon says sound business to machine.The data service that digital handset provides comprises short message, picture, geographical location information etc., and these have all greatly enriched the application of intercom, have met better actual user's demand.The 3rd, digital handset can provide speech clearly in the larger context, because digital communication technology has error correction feature in system, compare with analog-interphone, can be in a wider general signal environment, realize better speech audio quality, its audio noise receiving can be less, and sound is also more clear.The 4th, digital handset can also improve and to improve voice-and-data integrated, changes control signal and with communication distance, increases the weakness reducing.Compare with voice and the data system of similar integrated simulation, digital handset can provide better data processing and interface function, thereby more market demand can be integrated in same two-way wireless communication architecture of base station, make voice-and-data service integrated more perfect, more convenient.
These several large features have determined that digital handset will become the trend of following intercom development.2004, ETSI (ETSI) proposed new digital trunked communication system, i.e. DMR (Digital Mobile Radio) system.The DMR first stage is intercom pattern, and it and existing analog-interphone have similar place, easily from analog-interphone, be transitioned into digital handset, and cost are lower.In digital handset communication system, relate to the demodulation of baseband modulation sending and receiving, how to receive fast data and demodulation and recover the problem that data become worth research.
Make a general survey of current matched filtering method, just design of filter is become and the identical square root raised cosine filter of transmitting terminal formed filter coefficient, its operand is large, and length consuming time, high to the processor requirement of DSP.
Summary of the invention
In order to solve the problem existing in above-mentioned background technology, the present invention aims to provide the high-speed receiving data of a kind of DMR of being applicable to and the method for matched filtering, can fast and effeciently from AD, fetch data and carry out matched filtering.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is:
Be applicable to the high-speed receiving data of DMR and a method for matched filtering, it is characterized in that: comprise following steps:
(1) the annular array DATA[2304 that is 384*6 in length of data space application], it comprises 6 buffer areas, the length of each buffer area is 384, and according to sequentially defining respectively the 0/1/2/3/4/5th buffer area clockwise or counterclockwise, is used for respectively depositing the input value of matched filtering;
(2) a marking variable P of definition, represent to point to the original position of valid data, P=0, and 1,2,3,4,5, represent that this numbers the original position of corresponding buffer area; Define a sampling marking variable Q, initial value is 0;
(3) AD sampling, and leave successively the data that collect in DATA[2304] in the continuous buffer area that starts of the buffer area that points to from P, and whenever 384 data of AD sampling, Q just adds 1, until sampling marking variable Q is 4 o'clock, 1536 data of now sampling altogether;
(4) an interim array DATA_TEMP[1536 of application], initial value is 0, for temporarily depositing DATA[2304] 1536 data continuous 4 buffer areas of starting of the buffer area that points to from P;
(5) by DATA_TEMP[1536] in the value of minimum digital quantity be assigned to a variables A D_min, then by DATA_TEMP[1536] in each data deduct the value of AD_min, obtain new DATA_TEMP[1536];
(6) an array FILTER[n+1 of application], for depositing the coefficient of matched filter, the exponent number of described matched filter is n, n >=8 and n are even number, this matched filter has n+1 coefficient, all coefficients be biased to retain after positive number field first, the value of last and a middle coefficient, the value of other coefficients all sets to 0;
(7) an array DATA_OUT[1536 of application], be used for depositing the output valve of matched filtering, initial value is 0, defines a temporary variable DATA_NUM simultaneously, initial value is 0;
(8) the new DATA_TEMP [1536] step (6) being obtained and FILTER [n+1] carry out convolution algorithm, first result is placed in temporary variable DATA_NUM, then move to right 11, then result be assigned to DATA_OUT[1536], this has just completed a matched filtering;
(9) if the data after this time matched filtering do not obtain synchronously, just sampling marking variable Q is subtracted to 1, marking variable P adds a rear mold 6, then turns to step (10); If the data after this time matched filtering obtain synchronously, marking variable P is constant, and sampling marking variable Q assignment is-2, then turns to step (10);
(10) until sampling marking variable Q is, return to step (4) at 4 o'clock.
Wherein, in step (6), the exponent number of matched filter is 16.Matched filter is the square root raised cosine filter identical with transmitting terminal formed filter.
Wherein, the resolution of above-mentioned AD sampling is 12.Annular array DATA[2304 described in step (1)] in the value of all elements be the digital quantity between 0-4095.
The beneficial effect that adopts technique scheme to bring:
The data that the method that the present invention adopts can the continuous AD of fast processing gathers, carry out matched filtering fast, and filtering appts noise, is conducive to system quick lock in synchronous code, thereby recovers more rapidly and accurately data.And, once after finding synchronously, just can select suitable data to carry out matched filtering processing, thereby save processing time and computational space.In addition, the use of annular array can effectively be avoided the overlapping of data and cover, and practicality is better.
Accompanying drawing explanation
Fig. 1 is Circular buffer of the present invention district schematic diagram.
Valid data district schematic diagram in Tu2Wei Circular buffer district from P=0, during Q=3.
Valid data district schematic diagram in Fig. 3 Circular buffer district from P=3, during Q=4.
The data-moving flow chart of Tu4Wei Circular buffer district when P=3, Q=4.
Fig. 5 is flow chart of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
DMR system is that a kind of ZSP540 of use is as the professional digital mobile radio communication system of coprocessor.
The annular array DATA[2304 that is 384*6 in length of data space application], it comprises 6 buffer areas, be used for depositing the input value of matched filtering, define a marking variable P, initial value is made as 0, P is circulation change between 0/1/2/3/4/5 this 6 number, represents to point to respectively the original position of the buffer area that these 6 length are 384, as shown in Figure 1.Define a sampling marking variable Q, represent the number of times of 384 data of AD sampling, initial value is 0, and whenever AD 384 data of having sampled, Q just adds 1.
First, initialization annular array DATA[2304], and P, Q are all set to 0.While just starting image data, in buffer area, there is no valid data, when AD samples, first to annular array DATA[2304] first buffer area write data, while writing full data in first buffer area, Q is added to 1, then from annular array DATA[2304] second buffer area start to write data, second buffer area write after full and write the 3rd buffer area, when the 3rd buffer area write full after, Q=3, as shown in Figure 2.
The present embodiment be take P=3 as example, writes successively full annular array DATA[2304] four buffer areas, Q=4 now, as shown in Figure 3.From annular array DATA[2304] four groups of valid data are moved to DATA_TEMP[1536] in, as shown in Figure 4.
Then, define a variables A D_min, by digital quantity assignment minimum in DATA_TEMP [1536], to AD_min, then by 1536 data, each deducts the value of AD_min, obtains new array DATA_TEMP 1[1536].Apply for an array FILTER[17], deposit the coefficient of 16 rank matched filters, in order to resist intersymbol interference, 16 rank matched filters are designed to the square root raised cosine filter identical with transmitting terminal formed filter, all coefficients are biased to positive number field, retain in 17 coefficients the 1st, the value of the 9th and the 17th coefficient, the value of other coefficients is 0.Apply for an array DATA_OUT[1536], be used for depositing the output valve of matched filtering, initial value is 0, the temporary variable DATA_NUM that definition is simultaneously individual 32, initial value is 0.DATA_TEMP1 [1536] and FILTER [17] are carried out to convolution algorithm, and first the result obtaining is placed in temporary variable DATA_NUM, then moves to right 11, then result is assigned to DATA_OUT[1536], this has just completed a matched filtering.If the data after this time matched filtering can not obtain synchronous code, just Q is subtracted to 1, mark P adds mould 6 in the lump, be Q=3, P=4, then restarts AD sampling, then restarts AD sampling, when Q=4, stop AD sampling, only adopted one group of 384 data, left the 2nd buffer area in, now valid data are the data continuous 4 buffer areas that start from P=4, deposit these valid data in DATA_TEMP [1536], again carry out matched filtering.If the data after this time matched filtering find synchronous code, are just that-2, P is constant by Q assignment, restart matched filtering.Whole process as shown in Figure 5.
AD sampling Once you begin, unless program interrupt, otherwise sampled data always, 384 data of AD sampling need 10ms, and the processing of a matched filtering completes within 10ms.
According to above-mentioned implementation step, the data that received RF receiving circuit that can be continuous is fast carried to AD are also carried out matched filtering, and in the present invention, the use of buffer circle, can effectively avoid the overlapping of data and cover, and practicality is better.
The present embodiment can be applied to, in the communication of DMR standard digital intercom special wireless network, also can be applied to the system of other digital handset application.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (5)
1. be applicable to the high-speed receiving data of DMR and a method for matched filtering, it is characterized in that: comprise following steps:
(1) the annular array DATA[2304 that is 384*6 in length of data space application], it comprises 6 buffer areas, the length of each buffer area is 384, and according to sequentially defining respectively the 0/1/2/3/4/5th buffer area clockwise or counterclockwise, is used for respectively depositing the input value of matched filtering;
(2) a marking variable P of definition, represent to point to the original position of valid data, P=0, and 1,2,3,4,5, represent that this numbers the original position of corresponding buffer area; Define a sampling marking variable Q, initial value is 0;
(3) AD sampling, and leave successively the data that collect in DATA[2304] in the continuous buffer area that starts of the buffer area that points to from P, and whenever 384 data of AD sampling, Q just adds 1, until sampling marking variable Q is 4,1536 data have now been gathered altogether;
(4) an interim array DATA_TEMP[1536 of application], initial value is 0, for temporarily depositing DATA[2304] 1536 data continuous 4 buffer areas of starting of the buffer area that points to from P;
(5) by DATA_TEMP[1536] in the value of minimum digital quantity be assigned to a variables A D_min, then by DATA_TEMP[1536] in each data deduct the value of AD_min, obtain new DATA_TEMP[1536];
(6) an array FILTER[n+1 of application], for depositing the coefficient of matched filter, the exponent number of described matched filter is n, n >=8 and n are even number, this matched filter has n+1 coefficient, all coefficients be biased to retain after positive number field first, the value of last and a middle coefficient, the value of other coefficients all sets to 0;
(7) an array DATA_OUT[1536 of application], be used for depositing the output valve of matched filtering, initial value is 0, defines a temporary variable DATA_NUM simultaneously, initial value is 0;
(8) the new DATA_TEMP [1536] step (6) being obtained and FILTER [n+1] carry out convolution algorithm, first result is placed in temporary variable DATA_NUM, then move to right 11, then result be assigned to DATA_OUT[1536], this has just completed a matched filtering;
(9) if the data after this time matched filtering do not obtain synchronously, just sampling marking variable Q is subtracted to 1, marking variable P adds a rear mold 6, then turns to step (10); If the data after this time matched filtering obtain synchronously, marking variable P is constant, and sampling marking variable Q assignment is-2, then turns to step (10);
(10) until sampling marking variable Q is, return to step (4) at 4 o'clock.
2. a kind of high-speed receiving data of DMR and method of matched filtering of being applicable to according to claim 1, is characterized in that: in step (6), the exponent number of matched filter is 16.
3. according to a kind of high-speed receiving data of DMR and method of matched filtering of being applicable to described in claim 1 or 2, it is characterized in that: described matched filter is the square root raised cosine filter identical with transmitting terminal formed filter.
4. a kind of high-speed receiving data of DMR and method of matched filtering of being applicable to according to claim 1, is characterized in that: the resolution of described AD sampling is 12.
5. a kind of high-speed receiving data of DMR and method of matched filtering of being applicable to according to claim 4, is characterized in that: annular array DATA[2304 described in step (1)] in the value of all elements be the digital quantity between 0-4095.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1669238A (en) * | 2002-07-26 | 2005-09-14 | 高通股份有限公司 | Non-parametric matched filter receiver for wireless communication systems |
| CN102624662A (en) * | 2012-04-13 | 2012-08-01 | 南京航空航天大学 | Incoherent detection technology suitable for DMR digital trunking communication system |
| CN203166903U (en) * | 2013-03-04 | 2013-08-28 | 福建泉州市发达电子有限公司 | Same-frequency transmission system of DMR communication |
| CN203289595U (en) * | 2013-03-04 | 2013-11-13 | 福建省万华电子科技有限公司 | Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators |
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- 2014-06-17 CN CN201410269295.2A patent/CN104038247A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1669238A (en) * | 2002-07-26 | 2005-09-14 | 高通股份有限公司 | Non-parametric matched filter receiver for wireless communication systems |
| CN102624662A (en) * | 2012-04-13 | 2012-08-01 | 南京航空航天大学 | Incoherent detection technology suitable for DMR digital trunking communication system |
| CN203166903U (en) * | 2013-03-04 | 2013-08-28 | 福建泉州市发达电子有限公司 | Same-frequency transmission system of DMR communication |
| CN203289595U (en) * | 2013-03-04 | 2013-11-13 | 福建省万华电子科技有限公司 | Digital DMR (digital mobile radio) interphone using digital frequency synthesizers as local oscillators |
Non-Patent Citations (1)
| Title |
|---|
| 丁婧: "《中国优秀硕士学位论文全文数据库信息科技辑》", 31 July 2009, article "DMR数字端机物理层传输技术的研究" * |
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