CN207819906U - Support the high-power data radio station in high linearity narrowband of more modulation demodulation mode - Google Patents
Support the high-power data radio station in high linearity narrowband of more modulation demodulation mode Download PDFInfo
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- CN207819906U CN207819906U CN201820090809.1U CN201820090809U CN207819906U CN 207819906 U CN207819906 U CN 207819906U CN 201820090809 U CN201820090809 U CN 201820090809U CN 207819906 U CN207819906 U CN 207819906U
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Abstract
The utility model discloses a kind of high-power data radio stations in high linearity narrowband for supporting more modulation demodulation mode, due to including mainly：High Performance Zero medium frequency reception chip SCT3810, and the baseband chip SCT3258 of more modulation demodulation mode and high linearity transmitting chip CMX998 is supported to constitute.It is the high-power data radio station in high linearity narrowband that can support more modulation demodulation mode.Compared with similar product in the market, in the case of same band, maximum transmission rate is 23 times of similar product.Receiver uses zero intermediate frequency reception scheme, and circuit structure is simple, and integrated level is high, and consistency is good.Transmitter includes cartesian ring backfeed loop, has the splendid linearity and emission spectrum.Product meets Europe ETSI EN 300 113 and the requirement of 301 166 indexs of correlation of ETSI EN.
Description
Technical field
The utility model number biography is related to technical field, and in particular, to supports the high linearity of more modulation demodulation mode
The high-power data radio station in narrowband.
Background technology
Current narrowband data radio station common on the market mostly uses various FM modulation systems, and transmission rate is very limited.Example
Such as
Leading day essence radio station in industry, when channel width is 25kHz, transmission rate is same on the market at present
It is highest under bandwidth --- 38.4kbps.Common day essence radio station specification such as table one.
Table one
And the data radio station of the utility model design is used, due to that can support the high-order modulatings such as 64QAM,
Maximum transmission rate can reach 108kbps under 25kHz bandwidth.
The advantage of narrowband communication receiver is highly sensitive and very strong anti-interference ability, can guarantee on this basis compared with
Remote point-to- point communication distance.But also because these characteristics determine that such scheme is high to RF performance requirements, traditional is super outer
Poor reception circuit is well positioned to meet such application scenarios.But traditional superheterodyne circuit needs multiple down coversion and height
The discrete devices such as the crystal filter and ceramic filter of Q values, peripheral circuit is complicated, and discrete device quantity is more.Finally
Receiver performance influenced by the discreteness of discrete device, can also have a certain difference.And zero intermediate frequency reception scheme can overcome
The shortcomings of superheterodyne reception realize that the integrated and consistency of height is more superior, but receiver RF aspect of performance but without
Method and superhet are comparable.
Current narrowband communication mostly uses traditional FM modulation.FM is modulated to constant envelope signal, is not wanted linearly to transmitter
It asks,
Therefore emission power amplifier can meet system requirements according to saturation power output.Higher transfer rate can be reached
High order modulation signal there are non-constant envelope signals such as amplitude modulation and phase modulation, linear transmitter degree is required high.This requires transmitting
Power amplifier needs retract on the basis of saturation peak power, could meet the linear requirements of system.Such as：64QAM
The peak-to-average force ratio of modulated signal is 7.3dB.The emission power amplifier of 5W (37dBm) needs rollback 7.3dB that can just meet the requirements, this
When actual emission power there was only 29.7dBm, about 1W.It can be seen that high order modulation is very harsh to the linear requirements of transmitter, lead
It causes the efficiency of rf power amplifier very low, is difficult to realize high-power.
Utility model content
The purpose of this utility model is that in view of the above-mentioned problems, proposing a kind of high line for supporting more modulation demodulation mode
Property degree narrowband high-power data radio station, to overcome existing defect in the prior art.
To achieve the above object, the technical solution adopted in the utility model is：A kind of more modulation demodulation mode supported
The high-power data radio station in high linearity narrowband includes mainly：
Zero intermediate frequency reciver chip SCT3810 generates I/Q signal and exports I/Q signal to baseband chip SCT3258；
Baseband chip SCT3258 receives I/Q signal, I/Q signal is demodulated.
Chip CMX998 with cartesian ring backfeed loop is modulated the signal of SCT3258 outputs, and by radio frequency
The nonlinear properties of amplifirer output being distorted feed back to chip interior and compensate, and realize linear output；
Rf power amplifier amplifies modulated signal；
Radio frequency converting switch is connected to the output end of rf power amplifier, realizes that the output state of signal and external signal are defeated
Enter the switching of state；
Local vibration source provides local oscillation signal to CMX998 and SCT3810 respectively.
Further, CMX998 includes the IQ solutions of the I/Q signal amplifier of forward emitted access, I/Q modulator, backfeed loop
Adjust device and the first local oscillator frequency divider with two paths and phase controller, the input terminal of I/Q signal amplifier with
The input terminal of SCT3258 connections, the output end of the I/Q signal amplifier and I/Q modulator connects, the output end of I/Q modulator with penetrate
Frequency amplifirer connects, and the first local oscillator frequency divider and phase controller are connect with the input terminal of the IQ demodulators of backfeed loop all the way,
Another way is connect with IQ demodulators；The output end of rf power amplifier and the IQ demodulators of backfeed loop connect.
Further, CMX998 further includes DC anticipator circuits, the accurate DC difference signals for reading I road signals and the roads Q signal,
Counter-notification baseband chip SCT3258 compensates DC.
Further, the output end of rf power amplifier is connected by the IQ demodulators of coupler and backfeed loop.
Further, the SCT3810 includes the amplifier of high linearity and low noise connected in sequence, frequency mixer,
Level-one filter amplification circuit and second level filter amplification circuit further include the local oscillation signal frequency dividing being connect with high linearity frequency mixer
Device and local oscillation signal phase controller；First order filter amplification circuit includes first order filter and variable gain amplifier, and
Secondary filter amplifying circuit includes second level filter and fixed gain amplifier；
Local oscillation signal is penetrated by local oscillation signal frequency divider and local oscillation signal phase controller with what low-noise amplifier amplified
Frequency signal is mixed, and I/Q signal is generated, which is carried out after the filter of the first order by the amplifier of variable gain
Amplification, the amplifier that gain is then fixed after the filter filtering of the second level amplify to obtain the amplified I/Q signal of two-stage,
And the amplified I/Q signal of two-stage is exported to SCT3810
Further, the modulation system of baseband chip SCT3258 is FSK, 2FSK, 4FSK, MSK, QPSK, Pi/4-
DQPSK, 8PSK or QAM.
Further, rf power amplifier AFT05MS031N
The high-power data radio station in high linearity narrowband of the support more modulation demodulation mode of various embodiments of the utility model,
Due to including mainly：High Performance Zero medium frequency reception chip SCT3810, and support the baseband chip of more modulation demodulation mode
SCT3258 and high linearity transmitting chip CMX998 are constituted.It is the high linearity narrowband that can support more modulation demodulation mode
High-power data radio station.Compared with similar product in the market, in the case of same band, maximum transmission rate is similar production
2-3 times of product.Receiver uses zero intermediate frequency reception scheme, and circuit structure is simple, and integrated level is high, and consistency is good.Transmitter includes
Cartesian ring backfeed loop has the splendid linearity and emission spectrum.Product meets Europe ETSI EN 300 113 and ETSI
The requirement of 301 166 indexs of correlation of EN.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Description of the drawings
Attached drawing is used to provide a further understanding of the present invention, and a part for constitution instruction, with this practicality
Novel embodiment for explaining the utility model, does not constitute limitations of the present invention together.In the accompanying drawings：
Fig. 1 is the high-power number in high linearity narrowband of the support more modulation demodulation mode described in the utility model embodiment
Conduct electricity platform structure principle chart.
Specific implementation mode
The preferred embodiment of the utility model is illustrated below in conjunction with attached drawing, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
Embodiment one：
In conjunction with Fig. 1, the output end of receiver SCT3810 is connect with the input terminal of base band SCT3258, the output of SCT3258
End is connect with transmitter CMX998, and the output end of CMX998 is connect with the input terminal of rf power amplifier (AFT05MS031N), radio frequency
The output end of amplifirer is connected by the input terminal of coupler CMX998, and the output end of rf power amplifier also switches with radio-frequency receiving-transmitting
One end of switch connects, and the other end of the switch of radio-frequency receiving-transmitting and the input terminal of SCT3810 connect, and antenna switches with radio-frequency receiving-transmitting
Switch connection, local vibration source are connect with CMX998 and SCT3810 respectively.
Zero intermediate frequency reciver chip SCT3810 generates I/Q signal and exports I/Q signal to baseband chip SCT3258；
Baseband chip SCT3258 receives I/Q signal, I/Q signal is demodulated.
Chip CMX998 with cartesian ring backfeed loop is modulated the signal of SCT3258 outputs, and by radio frequency
The nonlinear properties of amplifirer output being distorted feed back to chip interior and compensate, and realize linear output；
Rf power amplifier amplifies modulated signal；
Radio frequency converting switch is connected to the output end of rf power amplifier, realizes that the output state of signal and external signal are defeated
Enter the switching of state；
Local vibration source provides local oscillation signal to CMX998 and SCT3810 respectively.
Embodiment two：
CMX998 include the I/Q signal amplifier of forward emitted access, I/Q modulator, backfeed loop IQ demodulators and
The first local oscillator frequency divider and phase controller, the input terminal of I/Q signal amplifier with two paths are connect with SCT3258, should
The output end of I/Q signal amplifier and the input terminal of I/Q modulator connect, and the output end of I/Q modulator is connect with rf power amplifier,
First local oscillator frequency divider and phase controller are connect with the input terminal of the IQ demodulators of backfeed loop all the way, and another way is demodulated with IQ
Device connects；The output end (can pass through coupler) of rf power amplifier is connect with the IQ demodulators of backfeed loop.
Chip CMX998 of the inside with cartesian ring backfeed loop, the distortion that transmitter power amplifier can be exported
Nonlinear properties feed back to chip interior and compensate, be finally reached linear output.It is logical comprising forward emitted inside CMX998
The I/Q signal amplifier on road, I/Q modulator, the respective LO local oscillators frequency divider of IQ demodulators and two paths of backfeed loop and
Phase controller.
I/Q signal amplifier is responsible for the differential IQ signal that base band provides being converted to single-ended I/Q signal and be amplified, then and anti-
The I/Q signal for being fed back to road generation generates final I/Q signal into predistortion amplifier together, after the modulation of I/Q modulator up-conversion
Transmitting.It is understood that if the flip-flop of IQ two paths of signals is inconsistent, local oscillator leakage, chip have been can be appreciated that on emission spectrum
DC anticipator circuits have been internally integrated, the DC differences of the roads I signal and the roads Q signal can be accurately read, to counter-notification base band
Chip makes corresponding compensation to DC, ensures that the DC of I road signals and the roads Q signal is completely the same existing to avoid local oscillator leakage
As.It is amplified by external radio frequency amplifier through the modulated radiofrequency signal of I/Q modulator up-conversion, external at this time penetrates
Audio amplifier can be operated in close to saturation region, it means that the modulated signal for including in amplified radiofrequency signal all exists
Distortion is demodulated after the radio frequency signal feedback of this distortion is returned chip interior by the IQ demodulator down coversions of chip interior
The distortion I/Q signal fed back compares base band subsequently into above-mentioned predistortion amplifier in predistortion amplifier
The I/Q signal of generation and the distorted signal fed back are made after compensating accordingly according to comparison result to finally be managed
The I/Q signal thought.Entire backfeed loop after stablizing foundation, can all be mended by the distortion that entire transmitting path generates
It repays.Having a phase shifter between Up/Down Conversion device and local oscillation channel, (i.e. phase controller is sent to respectively after local oscillation signal transplants
Low-converter), adjust phase shifter so that Up/Down Conversion synchronizes, to eliminate produced by external radio frequency amplifier and backfeed loop
Delay influence.The calibration accuracy of entire loop depends not only on gain and the bandwidth of circuit, also depends on down coversion solution
Adjust the linearity of device.The linearity of down coversion demodulator significantly determines the calibration energy of cartesian ring linearized system
Power.
Through practical proof, after transmitter chip CMX998, only require that radio-frequency power amplifier is operated in less than full
The linear requirements of system can be met with peak power 1dB or less.This and conventional linear emission system need rollback 6- easily
7dB, which is compared, big advantage.It is equivalent to and realizes Class A or the function of class AB power amplifier with Class C power amplifier, greatly improve work(
The efficiency and output power put can be readily implemented big work(while meeting the linear requirements of high order modulation as 64QAM
The output of rate.
After the I/Q modulator with cartesian ring, base band can be coordinated to use high order modulation signal.Use high order modulation
Benefit be that higher transmission rate can be obtained under comparable bandwidths.But the peak-to-average force ratio of high order modulation signal usually all compares
It is higher, therefore can be relatively high to the linear requirements of power amplifier.This needs emission power amplifier on the basis of saturation peak power
It does to retract and could meet the linear requirements of system.Power amplifier linearity is optimized using cartesian ring backfeed loop
Afterwards, the linearity can be improved greatly.By practical proof, after cartesian ring backfeed loop, radio-frequency power amplifier is defeated
Go out power only need to can linearly meet the requirement of system under conditions of less than saturation power 1dB, greatly improve power and put
The efficiency of big device, saves power consumption, easily realizes the high-power output of high order modulation.
After the I/Q modulator with cartesian ring, cartesian ring optimizes the linearity of system, it is ensured that high contrast
Under system, radiofrequency signal quality linear does not deteriorate.Coordinate base band to use higher order modulation signal, can greatly promote same band
Under message transmission rate.This programme highest can support 64QAM modulation systems, and maximum transmission rate can be under 25kHz bandwidth
Reach 108kbps.The message transmission rate of remote super all existing equal transport bandwidth products.
Embodiment three：
The SCT3810 includes that amplifier, frequency mixer, the first order filtering of high linearity and low noise connected in sequence are put
Big circuit and second level filter amplification circuit further include the local oscillation signal frequency divider being connect with high linearity frequency mixer and local oscillator letter
Number phase controller；First order filter amplification circuit includes first order filter and variable gain amplifier, and second level filtering is put
Big circuit includes second level filter and fixed gain amplifier；
Local oscillation signal is penetrated by local oscillation signal frequency divider and local oscillation signal phase controller with what low-noise amplifier amplified
Frequency signal is mixed, and I/Q signal is generated, which is carried out after the filter of the first order by the amplifier of variable gain
Amplification, the amplifier that gain is then fixed after the filter filtering of the second level amplify to obtain the amplified I/Q signal of two-stage,
And the amplified I/Q signal of two-stage is exported to SCT3810.
SCT3810, the receptivity for reaching similar superhet simultaneously, the circuit knot with zero intermediate frequency reciver
The features such as structure is simple, high integration, and consistency is good.
The inside SCT3810 includes the LNA with high linearity and low noise, Mixer, LO frequency dividers and phase controller,
And the circuits such as filtering and amplification of I/Q signal.LO signals generate after frequency divider with the external RF signals mixing of LNA amplifications
I/Q signal, this I/Q signal is amplified after the filter of the first order by the VGA of a variable gain, then by the second level
By the amplifier amplification output of a fixed gain to Base-Band Processing after filter filtering.The bandwidth of operation of second level filter can
To be controlled by the capacitance outside SCT3810, real work bandwidth may be implemented by the control of SCT3810 internal registers and exist
Relax in proportion on the basis of the bandwidth of operation that this peripheral hardware determines, the application under different communication bandwidths is realized with this.Base band
The gain for adjusting LNA and VGA inside SCT3810 according to the intensity of I/Q signal after obtaining I/Q signal, to ensure different
External RF signals intensity obtains best I/Q signal amplitude to finally obtain best demodulation result.
Example IV：
This programme all uses the modulation demodulation system of IQ due to Receiver And Transmitter, and Receiver And Transmitter all has
There are very high line row degree, cooperation baseband chip SCT3258 that can not only support FSK, 2FSK, 4FSK, the perseverance envelope such as MSK
FM modulation systems, can also support QPSK, Pi/4-DQPSK,
The non-constant enveloped modulation mode such as 8PSK, QAM.It greatly improves in 25kHz bandwidth message transmission rate below,
The advantages of narrow band transmission communication distance is remote taking into account, strong antijamming capability simultaneously, significantly compensates for narrowband communication data
The low defect of transmission rate.
The high-power data radio station in high linearity narrowband for the support more modulation demodulation mode that this programme is realized, it is final
Performance indicator such as table two.All indexs are satisfied by 300 113 standard of European ETSI EN 301 166 and ETSI EN.
Following advantageous effect can at least be reached：
As radio application field constantly expands, radio station's quantity is on the increase, and airborne electromagnetic environment is increasingly
Complexity, the contradiction between demand and supply to Radio Spectrum Resource increasingly increase.This programme uses the IQ tune with cartesian ring
Device processed can coordinate base band to obtain higher transmission rate under comparable bandwidths using high order modulation signal.To in fixation
Message transmission rate under, the bandwidth resources of occupancy are less, can greatly improve the utilization rate of frequency spectrum resource.
Above-described embodiment is to realize corresponding signal processing by the design of hardware circuit, is not rely on algorithm.
This programme the advantages of strong antijamming capability simultaneously, significantly makes up to take into account narrow band transmission communication distance remote
The low defect of narrowband communication message transmission rate, has filled up the product blank of similar product currently on the market.It is preferably full
The foot market demand of some narrowband high transfer rates.
Finally it should be noted that：The above descriptions are merely preferred embodiments of the present invention, is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it still can be with technical scheme described in the above embodiments is modified, or to which part technical characteristic
Carry out equivalent replacement.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on,
It should be included within the scope of protection of this utility model.
Claims (7)
1. supporting the high-power data radio station in high linearity narrowband of more modulation demodulation mode, which is characterized in that
Zero intermediate frequency reciver chip SCT3810 generates I/Q signal and exports I/Q signal to baseband chip SCT3258；
Baseband chip SCT3258 receives I/Q signal, I/Q signal is demodulated；
Chip CMX998 with cartesian ring backfeed loop is modulated the signal of SCT3258 outputs, and by RF power amplification
The nonlinear properties of device output being distorted feed back to chip interior and compensate, and realize linear output；
Rf power amplifier amplifies modulated signal；
Radio frequency converting switch is connected to the output end of rf power amplifier, realizes the output state and external signal input shape of signal
The switching of state；
Local vibration source provides local oscillation signal to CMX998 and SCT3810 respectively.
2. the high linearity narrowband high-power data radio station according to claim 1 for supporting more modulation demodulation mode,
Be characterized in that, CMX998 include the I/Q signal amplifier of forward emitted access, I/Q modulator, backfeed loop IQ demodulators and
The first local oscillator frequency divider and phase controller, the input terminal of I/Q signal amplifier with two paths are connect with SCT3258, should
The output end of I/Q signal amplifier and the input terminal of I/Q modulator connect, and the output end of I/Q modulator is connect with rf power amplifier,
First local oscillator frequency divider and phase controller are connect with the input terminal of the IQ demodulators of backfeed loop all the way, and another way is demodulated with IQ
Device connects；The output end of rf power amplifier and the IQ demodulators of backfeed loop connect.
3. the high linearity narrowband high-power data radio station according to claim 2 for supporting more modulation demodulation mode,
It is characterized in that, CMX998 further includes DC anticipator circuits, the accurate DC difference signals for reading I road signals and the roads Q signal, counter-notification
Baseband chip SCT3258 compensates DC.
4. the high linearity narrowband high-power data radio station according to claim 3 for supporting more modulation demodulation mode,
It is characterized in that, the output end of rf power amplifier is connected by the IQ demodulators of coupler and backfeed loop.
5. the high linearity narrowband high-power data radio station according to claim 4 for supporting more modulation demodulation mode,
It is characterized in that, the SCT3810 includes amplifier, frequency mixer, the first order filtering of high linearity and low noise connected in sequence
Amplifying circuit and second level filter amplification circuit further include the local oscillation signal frequency divider being connect with high linearity frequency mixer and local oscillator
Signal phase controller；First order filter amplification circuit includes first order filter and variable gain amplifier, second level filtering
Amplifying circuit includes second level filter and fixed gain amplifier；
Local oscillation signal is believed by local oscillation signal frequency divider and local oscillation signal phase controller and the radio frequency of low-noise amplifier amplification
It number is mixed, generates I/Q signal, which is amplified after the filter of the first order by the amplifier of variable gain,
The amplifier that gain is then fixed after the filter filtering of the second level amplifies to obtain the amplified I/Q signal of two-stage, and by two
The amplified I/Q signal of grade is exported to SCT3810.
6. the high linearity narrowband high-power data radio station according to claim 5 for supporting more modulation demodulation mode,
Be characterized in that, the modulation system of baseband chip SCT3258 is FSK, 2FSK, 4FSK, MSK, QPSK, Pi/4-DQPSK, 8PSK or
QAM。
7. the high linearity narrowband high-power data radio station according to claim 5 for supporting more modulation demodulation mode,
It is characterized in that, rf power amplifier AFT05MS031N.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820090809.1U CN207819906U (en) | 2018-01-19 | 2018-01-19 | Support the high-power data radio station in high linearity narrowband of more modulation demodulation mode |
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| CN201820090809.1U CN207819906U (en) | 2018-01-19 | 2018-01-19 | Support the high-power data radio station in high linearity narrowband of more modulation demodulation mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109743063A (en) * | 2019-01-28 | 2019-05-10 | 西安玄黄通信技术有限公司 | A kind of baseband processing unit, wireless communication system and equipment based on FPGA |
| CN109818596A (en) * | 2019-01-29 | 2019-05-28 | 中国科学院上海微系统与信息技术研究所 | A kind of multi-channel radio frequency signal waveform and phase accurate control circuit |
| CN110138405A (en) * | 2019-04-25 | 2019-08-16 | 广州海格通信集团股份有限公司 | Communication device and method |
| CN110149121A (en) * | 2019-04-17 | 2019-08-20 | 北京邮电大学 | A kind of adjustable ultra wide band zero intermediate frequency transceiver rf analog front-end |
| WO2021134638A1 (en) * | 2019-12-31 | 2021-07-08 | 深圳迈瑞生物医疗电子股份有限公司 | Signal transmitting circuit, signal receiving circuit, and portable monitoring device |
| GB2594857B (en) * | 2018-12-13 | 2022-11-16 | Hytera Comm Corp Ltd | Radio-frequency topological system and communication apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2594857B (en) * | 2018-12-13 | 2022-11-16 | Hytera Comm Corp Ltd | Radio-frequency topological system and communication apparatus |
| CN109743063A (en) * | 2019-01-28 | 2019-05-10 | 西安玄黄通信技术有限公司 | A kind of baseband processing unit, wireless communication system and equipment based on FPGA |
| CN109818596A (en) * | 2019-01-29 | 2019-05-28 | 中国科学院上海微系统与信息技术研究所 | A kind of multi-channel radio frequency signal waveform and phase accurate control circuit |
| CN109818596B (en) * | 2019-01-29 | 2021-03-12 | 中国科学院上海微系统与信息技术研究所 | Multi-channel radio frequency signal waveform and phase accurate control circuit |
| CN110149121A (en) * | 2019-04-17 | 2019-08-20 | 北京邮电大学 | A kind of adjustable ultra wide band zero intermediate frequency transceiver rf analog front-end |
| CN110138405A (en) * | 2019-04-25 | 2019-08-16 | 广州海格通信集团股份有限公司 | Communication device and method |
| WO2021134638A1 (en) * | 2019-12-31 | 2021-07-08 | 深圳迈瑞生物医疗电子股份有限公司 | Signal transmitting circuit, signal receiving circuit, and portable monitoring device |
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