CN203166903U - Same-frequency transmission system of DMR communication - Google Patents
Same-frequency transmission system of DMR communication Download PDFInfo
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- CN203166903U CN203166903U CN2013200967218U CN201320096721U CN203166903U CN 203166903 U CN203166903 U CN 203166903U CN 2013200967218 U CN2013200967218 U CN 2013200967218U CN 201320096721 U CN201320096721 U CN 201320096721U CN 203166903 U CN203166903 U CN 203166903U
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Abstract
The utility model provides a same-frequency transmission system of DMR communication, comprising a MCU control module and a connected baseband processor. The MCU control module is respectively connected with a radio frequency chip and a local oscillator chip. The baseband processor is connected with a conversion module, a band pass filter a first amplifier, a mixer, an intermediate frequency amplifier and a frequency discriminator. The baseband processor is also connected with the frequency discriminator, forming a loop circuit integrally. The radio frequency chip is connected with the conversion module through two amplifiers. The baseband processor is respectively connected with the radio frequency chip and the local oscillator modulator through a crystal oscillator modulator. The conversion module is connected with an antenna through another band pass filter. Dual-piece RDA1846S chip circuit system structure is used in the system, thereby substantially simplifying circuit design and reducing cost. The system is wide in power supply range, and can be adjusted according to requirements. The system is convenient in debugging and design, and realizes same-frequency transmission and is low in cost.
Description
Technical field
The utility model relates to the wireless communication technique field, and what especially relate to is a kind of same communication system that keeps pouring in of DMR communication.
Background technology
The full name of DMR is digital mobile radio, its standard is the European private network communication standard that is used for substituting simulation PMR that ETSI promulgates, it has plurality of advantages such as coverage is big, transmission rate is high, spectrum efficiency is high, good energy-conserving effect, and is therefore widely good by market based on the private network communication product of DMR standard.The DMR standard adopts the time division multiple access frame structure of two time slots, except digital baseband is handled, also there has been bigger difficulty in circuit design, adopt the traditional circuit mode of phase-locked loop and VCO at present, because DMR system requirements covering frequence is wideer, but the debugging of the circuit mode of common VCO is comparatively difficult, and integrated functionality is poor, be difficult in and all reach satisfied requirement in coverage, performance, cost and the flexibility, can't satisfy the autgmentability demand of practical application.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of and adopts that two chip block structures, cost are low, the same communication system that keeps pouring in of the simple DMR communication of debugging control.
For achieving the above object, technical solution of the present utility model is: a kind of same communication system that keeps pouring in of DMR communication, comprise continuous MCU control module and baseband processor, and described MCU control module also links to each other with radio frequency chip and local oscillator chip respectively; Described baseband processor is connected with modular converter, band pass filter, first amplifier, frequency mixer, intermediate-frequency filter, intermediate frequency amplifier and frequency discriminator successively, and described baseband processor also links to each other with frequency discriminator, loop of whole formation; Described radio frequency chip links to each other with modular converter behind two amplifirers, and described baseband processor all links to each other with radio frequency chip, local oscillator chip respectively by VCXO, and described modular converter also links to each other with antenna by another band pass filter.
Preferably, described MCU control module adopts the STM32F103VF chip.
Preferably, described baseband processor adopts the HR-C5000 chip.
Preferably, described radio frequency chip and local oscillator chip all adopt the RDA1846S chip.
By adopting above-mentioned technical scheme; the beneficial effects of the utility model are: adopt two chip block circuit system structures; radio frequency chip adopts the RDA1846S chip to do the signal modulation and radio-frequency transmissions is used; the local oscillator chip adopts the RDA1846S chip that is set to radiation pattern output local oscillation signal in addition; use as signal source; the modulation signal function that radio frequency chip use itself has; infrasonic frequency during emission and radio-frequency enabled; the switching time of launching under the situation that does not change tranmitting frequency and stopping is less than 900 μ s; this time comprises control word input time; the power supply switching time of radio-frequency channel and comprehensive the survey demodulation time; can satisfy DMR time slot switch protecting time 2.5ms; but the stabilization time that does not comprise the radio frequency full power; realize with alien frequencies relaying forwarding frequently; and the RDA1846S chip itself has the integrated level height; with integrated hundreds of discrete devices and the integrated circuit of having substituted in the traditional scheme of single-chip; significantly simplified circuit design; reduced cost; supply district is wide; can support 2.7～5.5V; can regulate according to own needs; increased the flexibility of design greatly, the debugging design is convenient.
Description of drawings
Fig. 1 is system block diagram of the present utility model.
(identify among the figure: 1, MCU control module; 2, baseband processor; 3, radio frequency chip; 4, VCXO; 5, local oscillator chip; 6, modular converter; 7, band pass filter; 8, antenna; 9, band pass filter; 10, first amplifier; 11, frequency mixer; 12, intermediate-frequency filter; 13, intermediate frequency amplifier; 14, frequency discriminator.）
Embodiment
Further specify the utility model below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the same communication system that keeps pouring in of a kind of DMR communication of the present utility model, comprise continuous MCU control module 1 and baseband processor 2, both signals transmit mutually, MCU control module 1 adopts the STM32F103VF chip, described baseband processor 2 adopts the HR-C5000 chip, this chip adopts three layers of separate design, the user can the flexible Application physical layer, data link layer and call control layer, realize different application demands, and the integrated level height, can satisfy the multiple interfaces mode, reduce user's periphery circuit design etc., application is strong, and described MCU control module 1 also links to each other with radio frequency chip 3 and local oscillator chip 5 respectively; Described baseband processor 2 links to each other successively with modular converter 6, band pass filter 9, first amplifier 10, frequency mixer 11, intermediate-frequency filter 12, intermediate frequency amplifier 13 and frequency discriminator 14, described frequency discriminator 14 links to each other with baseband processor 2 again, a whole loop, the reception feedback of realization signal of forming; Described radio frequency chip 3 links to each other with modular converter 6 behind two amplifirers, described modular converter 6 also links to each other with antenna 8 by another band pass filter 7, thereby form the passage of radio-frequency transmissions, signal transmission, described baseband processor 2 all links to each other with radio frequency chip 3, local oscillator chip 5 respectively by VCXO 4, receive the modulation signal that baseband processor 2 sends, voltage-controlled temperature compensation effect when playing frequency adjustment, the normal accurately operation of systems stabilisation.Described radio frequency chip 3 and local oscillator chip 5 all adopt the RDA1846S chip, RDA1846S can be described as the intercom RF radio frequency chip that present integrated level is the highest, package area is minimum, it is by low intermediate frequency receiver and direct upconversion transmitter framework, with integrated hundreds of discrete devices and the integrated circuit of having substituted in the traditional scheme of single-chip, significantly simplify circuit design, reduced the BOM cost, improved the price competitiveness of end product, aspect power consumption, RDA1846S is operated in power consumption under the super low-power consumption sleep pattern less than 10 μ A, far below the performance of like product.Aspect sensitivity, need not external LNA, can reach professional intercom level: under the situation of the other side 0.5W transmitting power, accept distance in the urban district and can reach 1.5 kilometers.Aspect anti-interference, owing to adopt modulation-demodulation technique framework based on DSP, and the high accuracy that adopts during back-end processing, the digital filter of high s/n ratio, the outer spurious signal of filtering band exactly, antijamming capability is stronger.In addition, RDA1846 power supply supply district is wide, supports 2.7～5.5V, and the client can regulate according to own needs, has increased the flexibility of design greatly.
Operation principle: the RDA1846S that radio frequency chip 3 adopts uses as signal modulation and radio-frequency transmissions; after connecting, two amplifiers form transmission channel with modular converter 6 and antenna 8; and local oscillator chip 5 adopts the RDA1846S that is set to radiation pattern output local oscillation signal; it is as the local oscillation signal of first intermediate frequency; because the switching time＜900 μ s that RDA1846S launches under the situation that does not change tranmitting frequency and stops; this time comprises control word input time; the power supply switching time of radio-frequency channel and comprehensive the survey demodulation time; can satisfy DMR time slot switch protecting time 2.5ms, but not comprise the stabilization time of radio frequency full power.
Transmit: after MCU control module 1 gets access to the time slot reiving/transmitting state of baseband processor 2, carry out corresponding radio-frequency channel transmitting-receiving handover operation according to slot time.Radio frequency chip 3 is controlled the output of radiofrequency signal according to time slot by MCU control module 1 or is stopped.By MCU control module 1 control radio frequency chip 3 output radiofrequency signals, local oscillator chip 5 stops local oscillation signal output simultaneously, realizes output signal during the signal emission.
Receive signal: radio frequency chip 3 stopped radiofrequency signal output when same signal received, local oscillator chip 5 output local oscillation signals.Carrying out radio frequency from the signal of antenna 8 input after through band pass filter 7 and modular converter 6 amplifies, after passing through another band pass filter 9 filtering again, amplify and enter in the frequency mixer 11, with local oscillation signal and input signal mixing and generate intermediate-freuqncy signal, IF-FRE is 38.55MHz, eliminates spurious signals through intermediate-frequency filter 12, carry out corresponding frequency discrimination through frequency discriminator 14 again after the amplification, produce audio signal, at last by after baseband processor 2 and MCU control module 1 analyzing and processing, obtain voice signal.Overall structure is simple, adopts two chip block structures, realize with output effect frequently, and debugging convenience, flexible design, cost is hanged down and satisfied different customer demands.
Above-described, only be preferred embodiment of the present utility model, can not limit the scope that this practicality is implemented, every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.
Claims (4)
1. the same communication system that keeps pouring in of a DMR communication comprises continuous MCU control module (1) and baseband processor (2), it is characterized in that: described MCU control module (1) also links to each other with radio frequency chip (3) and local oscillator chip (5) respectively; Described baseband processor (2) is connected with modular converter (6), band pass filter (9), first amplifier (10), frequency mixer (11), intermediate-frequency filter (12), intermediate frequency amplifier (13) and frequency discriminator (14) successively, described baseband processor (2) also links to each other with frequency discriminator (14), loop of whole formation; Described radio frequency chip (3) links to each other with modular converter (6) behind two amplifirers, described baseband processor (2) all links to each other with radio frequency chip (3), local oscillator chip (5) respectively by VCXO (4), and described modular converter (6) also links to each other with antenna (8) by another band pass filter (7).
2. the same communication system that keeps pouring in of a kind of DMR communication according to claim 1 is characterized in that: described MCU control module (1) employing STM32F103VF chip.
3. the same communication system that keeps pouring in of a kind of DMR communication according to claim 1 is characterized in that: described baseband processor (2) employing HR-C5000 chip.
4. the same communication system that keeps pouring in of a kind of DMR communication according to claim 1, it is characterized in that: described radio frequency chip (3) and local oscillator chip (5) all adopt the RDA1846S chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200967218U CN203166903U (en) | 2013-03-04 | 2013-03-04 | Same-frequency transmission system of DMR communication |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013200967218U CN203166903U (en) | 2013-03-04 | 2013-03-04 | Same-frequency transmission system of DMR communication |
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| CN203166903U true CN203166903U (en) | 2013-08-28 |
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| CN2013200967218U Expired - Fee Related CN203166903U (en) | 2013-03-04 | 2013-03-04 | Same-frequency transmission system of DMR communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038247A (en) * | 2014-06-17 | 2014-09-10 | 无锡交大联云科技有限公司 | Method for rapidly receiving data and matched filtering applicable to DMR (Digital Mobile Radio) |
| CN110808754A (en) * | 2019-09-30 | 2020-02-18 | 泉州市琪祥电子科技有限公司 | Vehicle-mounted interphone with same-frequency relay function |
-
2013
- 2013-03-04 CN CN2013200967218U patent/CN203166903U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038247A (en) * | 2014-06-17 | 2014-09-10 | 无锡交大联云科技有限公司 | Method for rapidly receiving data and matched filtering applicable to DMR (Digital Mobile Radio) |
| CN110808754A (en) * | 2019-09-30 | 2020-02-18 | 泉州市琪祥电子科技有限公司 | Vehicle-mounted interphone with same-frequency relay function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20190304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |