CN203166906U - Same-frequency transmission system of FDMA communication - Google Patents
Same-frequency transmission system of FDMA communication Download PDFInfo
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- CN203166906U CN203166906U CN 201320097160 CN201320097160U CN203166906U CN 203166906 U CN203166906 U CN 203166906U CN 201320097160 CN201320097160 CN 201320097160 CN 201320097160 U CN201320097160 U CN 201320097160U CN 203166906 U CN203166906 U CN 203166906U
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Abstract
The utility model provides a same-frequency transmission system of FDMA communication, comprising a MCU control module and a connected baseband processor. The baseband processor is connected with a signal chip through a voltage controlled crystal oscillator. Output modulating signals of the baseband processor are coupled with an adjusting end of the voltage controlled crystal oscillator through a capacitor. The signal chip is connected with an antenna through an amplifier and a converter in sequence. A mixer and a frequency detector are connected between the converter and the baseband processor in sequence. The mixer is connected with the signal chip, and the signal chip is connected with the MCU control module. An RDA1846S chip is used in the signal chip. One piece of RDA1846S chip is used as the signal chip in a FDMA communication technology, and the signal chip can simultaneously output emission signals and local oscillator signals. Conventional circuit methods of phase-locked loop and VCO are not used. The system is high in integration, and phase locking time is lower than 500[mu]s. The system does not need debugging, and is very high in practicality, and realizes same-frequency transmission to satisfy requirements of common users.
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 FDMA communication.
Background technology
At present, field of wireless communication in China, the digital radio mechanics of communication appears on the market, it has strong interference immunity, speech quality is good, the frequency efficiency height, that adopt mostly is digital handset wireless communication protocol--the DMR/DPMR that is issued by the ETSI tissue, what wherein the DPMR agreement adopted is arrowband (6.25kHz) FDMA technology, but because of aspect the signal modulation, all is to adopt traditional phase-locked loop and the circuit mode of VCO, has certain defective, more single in Frequency Band Selection, and there is debug difficulties in circuit design, and the cost height, aspect the frequency modulation transmission, can not adjust flexibly, design flexibility is lower, and then can not satisfy the demand of different autgmentabilities.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of same communication system that keeps pouring in that adopts the FDMA communication of chips incorporate crystal modulation is provided.
For achieving the above object, technical solution of the present utility model is: a kind of same communication system that keeps pouring in of FDMA communication, comprise continuous MCU control module and baseband processor, described baseband processor is connected with signal chip by VCXO, the output modulation signal of described baseband processor is through the adjustment end of capacitor-coupled to VCXO, described signal chip passes through amplifier, transducer is connected with antenna successively, be connected with frequency mixer and frequency discriminator between described transducer and the baseband processor in turn, described frequency mixer links to each other with signal chip, signal chip also links to each other with the MCU control module, and described signal chip adopts the RDA1846S chip.
Preferably, described VCXO adopts the VC-TCXO oscillator of 13MHz.
Preferably, described capacitor is the ceramic condenser of 10uF.
By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: adopt 1 RDA1846S chip as signal chip in the FDMA communication technology, can export the signal chip that transmits with local oscillation signal simultaneously, not adopt the traditional circuit mode of phase-locked loop and VCO.Pattern operation in conjunction with the MCU control module is switched, when being in emission state, the RDA1846S chip is used as radio-frequency transmissions, modulation signal is imported the RDA1846S chip after VCXO and baseband processor analysis, radiofrequency signal enters amplifier by diverter switch and launches from antenna.When being in accepting state, the radiation pattern of RDA1846S chip is set to export local oscillation signal, thereby the local oscillation signal as first intermediate frequency, local oscillation signal enters frequency mixer by diverter switch and carries out mixing with the reception signal, the intermediate-freuqncy signal that produces, through entering after the frequency discriminator demodulation enters baseband processor and MCU control module Coordination Treatment, and exported by loud speaker.The circuit complexity that the phase-locked loop of relative traditional circuit and VCO exist, debug difficulties, coherence request height to components and parts, the utility model adopts one chip to realize emission and output local oscillation signal simultaneously, the integrated level height, and the phase-locked time is lower than 500 μ s, exempt from debugging, practicality is very high, and realization is defeated with keeping pouring in, and satisfies the public users demand.
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, VCXO; 4, signal chip; 5, amplifier; 6, antenna; 7, transducer; 8, frequency mixer; 9, 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 FDMA communication of the present utility model, a kind of same communication system that keeps pouring in of FDMA communication, comprise continuous MCU control module 1 and baseband processor 2, described baseband processor 2 is connected with signal chip 4 by VCXO 3, the output modulation signal of described baseband processor 2 is coupled to the adjustment end of VCXO 3 through capacitor 21, described signal chip 4 is by amplifier 5, transducer 7 is connected with antenna 8 successively, be connected with frequency mixer 8 and frequency discriminator 9 between described transducer 7 and the baseband processor 2 in turn, described frequency mixer 8 links to each other with signal chip 4, signal chip 4 also links to each other with MCU control module 1, and described signal chip 4 adopts the RDA1846S chip.It is the highest that chip RDA1846S can be described as present integrated level, the intercom RF radio frequency chip of package area 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 simplified 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, performance far below like product, in addition, RDA1846 power supply supply district is wide, supports 2.7～5.5V, the client can regulate according to own needs, has increased the flexibility of design greatly.Described VCXO 3 adopts the VC-TCXO oscillator of 13MHz.Described capacitor 21 is the ceramic condenser of 10uF, and because of being changed to ± 12PPm of the voltage-controlled oscillating frequency of VC-TCXO oscillator, the control voltage range is 0.5～2.5V.The signal output amplitude of adjusting baseband processor according to different rf frequency makes it the frequency modulation unanimity in transmit frequency range, plays the effect of the frequency signal that provides stable.
Operation principle: transmission channel, input signal is through 1 unified allocation of resources of MCU control module, and feed back to MCU control module 1 after the Treatment Analysis in conjunction with baseband processor 2, coordinate control signal chip 4 by MCU control module 1 and produce the radiofrequency signal of emission, its chip output is set to export radiofrequency signal, frequency adjustment end through VCXO 3, carry out effective frequency modulation, and by the handover operation of signal chip 4 in conjunction with MCU controller 1, through amplifier 5, transducer 7, after carrying out processing such as signal conversion, amplification, launch audio signal by antenna 6.
Receive path: the signal that receives from antenna 6 when signal receives through conversion process such as transducers 7 after, carrying out noise elimination is amplified in the frequency mixer 8, wherein signal chip 4 is in conjunction with MCU control module 1 and baseband processor 2, be set to export local oscillation signal, and by being connected with frequency mixer 8 after the frequency adjustment of VCXO 3, with local oscillation signal and input signal mixing and generate intermediate-freuqncy signal, carry out corresponding frequency discrimination through frequency discriminator 9, produce audio signal, by after baseband processor 2 and MCU control module 1 analyzing and processing, obtain voice signal at last.Overall structure is simple, adopt the one chip structure, realize with keeping pouring in defeated effect, and in conjunction with the crystal oscillator frequency modulation of VC-TCXO oscillator, the signal output amplitude of adjusting baseband processor according to different rf frequency makes it the frequency modulation unanimity in transmit frequency range, play the effect of the frequency signal that provides stable, flexible design, debugging is convenient.
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 (3)
1. the same communication system that keeps pouring in of FDMA communication, comprise continuous MCU control module (1) and baseband processor (2), it is characterized in that: described baseband processor (2) is connected with signal chip (4) by VCXO (3), the output modulation signal of described baseband processor (2) is coupled to the adjustment end of VCXO (3) through capacitor (21), described signal chip (4) is by amplifier (5), transducer (7) is connected with antenna (8) successively, be connected with frequency mixer (8) and frequency discriminator (9) between described transducer (7) and the baseband processor (2) in turn, described frequency mixer (8) links to each other with signal chip (4), signal chip (4) also links to each other with MCU control module (1), and described signal chip (4) adopts the RDA1846S chip.
2. the same communication system that keeps pouring in of a kind of FDMA communication according to claim 1 is characterized in that: the VC-TCXO oscillator of described VCXO (3) employing 13MHz.
3. the same communication system that keeps pouring in of a kind of FDMA communication according to claim 1, it is characterized in that: described capacitor (21) is the ceramic condenser of 10uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320097160 CN203166906U (en) | 2013-03-04 | 2013-03-04 | Same-frequency transmission system of FDMA communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320097160 CN203166906U (en) | 2013-03-04 | 2013-03-04 | Same-frequency transmission system of FDMA communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166906U true CN203166906U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320097160 Expired - Fee Related CN203166906U (en) | 2013-03-04 | 2013-03-04 | Same-frequency transmission system of FDMA communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203166906U (en) |
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2013
- 2013-03-04 CN CN 201320097160 patent/CN203166906U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |