CN204305021U - The AISG tower amplifier OOK modulation-demodulation circuit that data can return - Google Patents
The AISG tower amplifier OOK modulation-demodulation circuit that data can return Download PDFInfo
- Publication number
- CN204305021U CN204305021U CN201520022293.3U CN201520022293U CN204305021U CN 204305021 U CN204305021 U CN 204305021U CN 201520022293 U CN201520022293 U CN 201520022293U CN 204305021 U CN204305021 U CN 204305021U
- Authority
- CN
- China
- Prior art keywords
- input
- pass filter
- output
- connects
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses the AISG tower amplifier OOK modulation-demodulation circuit that a kind of data can return, it comprises modulator, demodulator and LC band pass filter, described modulator and demodulator is connected with the same signal end of LC band pass filter, DC power supply, radiofrequency signal and control signal conllinear is made by inductance, capacitive coupling, described modulator is made up of resonant circuit, frequency-halving circuit, digital switch, LC low pass filter, impedance transformer, and described demodulator is made up of amplifier, RC envelope detector, comparison circuit.The utility model circuit adopts cheap discrete device to build, and not only meet the index request of AISG protocol definition, and material procurement is with low cost, within the scope of total temperature, index is discrete little, and be applicable to multiple speed, productibility is strong.
Description
Technical field
The utility model relates to the tower amplifier in the communications field, refers to the AISG tower amplifier OOK modulation-demodulation circuit that a kind of data can return particularly.
Background technology
Along with Communications Market competition, each product systems integrator plays price war one after another, the purchase cost that upstream supplier is faced with system integrator is married again, at responding system integrator reduction product for commodity price with when ensureing that product index meets user rs environment instructions for use, become research and development department of each supplier effort power by design reduction product material procurement cost or intermediate link production cost.
Tower amplifier TMA (Tower Mounted Amplifier) namely increases a low noise amplifier in base station receiving system front end after top of tower abuts against reception antenna, before Received signal strength enters feeder line, Received signal strength can amplify by tower amplifier, improve uplink signal quality, improve call reliability and speech quality, expand MPS process area simultaneously.Because of tower amplifier plurality of advantages in the field of communications, in communication base station, obtain large area use widely,
AISG (Antenna Interface Standards Group, Antenna Interface Standards Group agreement) agreement is from 3GP (3
rdgeneration Partenership projiect, third generation partner program) agreement develops, for antenna system and Related product, relevant criterion is proposed, to carry out Long-distance Control and management by network to the equipment in whole system, and realize compatibility and the complementarity of devices from different manufacturers.
3 layer protocol models are defined in AISG agreement, OSI (Open SystemInterconnect, Open System Interconnection) seven layer network model (physical layers, data link layer, network layer, transport layer, session layer, presentation layer, application layer) a simplification, provide an effective protocol stack and be convenient to embedded controller and run.This 3 layer protocol model is: Layer1 layer: physical layer, defines signal level, character rate and input connected mode; Layer2 layer: data link layer, based on HDLC (High-Level Data Link Control, High-Level Data Link Control) standard subtype; Layer3 layer: definition data format and relevant control command collection.
The interconnected mode of 2 kinds of antenna equipments is defined: (1) modulation demodulation system: coaxial cable, DC power supply, radiofrequency signal and control signal conllinear in the Layer1 layer of AISG agreement; (2) RS485 mode, multicore cable, supports traditional RS485 signal multi-point bus mode, can adopt star-like and daisy chaining cascade at RS485 link.Modulation demodulation system is mainly used in the communication between BTS (Base Transceiver Station, base transceiver station) and AISG tower amplifier, and monitor message and some decay of collecting tower amplifier are arranged.RS485 mode is mainly used in controlling electrical tilt antenna RET (Remote Electrical Tilt, remote electric tilts) equipment, namely controls the tilt angled down of electrical tilt antenna RET, improves the control performance of electric melody aerial lower inclination angle.The signal of above-mentioned two kinds of connected modes can intercommunication, and default data traffic rate is 9.6kbps, and can also adopt higher communication speed 38.4kbps, RS485 mode selects the communication speed of 115.2kbps.
MODEM modulation demodulation system utilizes carrier wave transfer control signal, modulation system binary system on off keying OOK (On-Off Keying, have another name called two-stage system amplitude-shift keying and 2ASK) amplitude is taken as 0, another amplitude is taken as non-zero, and it is to control the open and close of sinusoidal carrier with unipolarity NRZ sequence.When being transmitted by coaxial wire, 2 transducers (i.e. modulator and demodulator) convert OOK (modulator) to bit stream, and another OOK returns into bit stream (demodulator).Concrete relevant parameter comprises: carry wave frequency and frequency deviation: 2.176MHZ ± 100ppm, impedance 50 Ω, return loss: carrier frequency ± 0.1MHZ>10dB; Modulator characteristic: ON-Level:3dBm ± 2dB, OFF_Level :≤-40dBm, output spectrum is shown in Figure 1, carrier wave ON detection range :-12 ~ 5dBm, carrier wave off detection range: <-18dBm ,-18dBm do not define to the demodulation level of-12dBm.But the mode of AISG agreement to modulation /demodulation only defines index, for These parameters, concrete design is not proposed, the special physical circuit corresponding for these index Design is not had in prior art yet, and the design of AISG tower amplifier OOK modulation-demodulation circuit is most important in the application, therefore by the such as debugging cost of design reduction product material procurement cost or intermediate link, long-term development of enterprise is seemed relevant important when OOK modulation-demodulation circuit meets client agreement definition index and product productibility, competitiveness and the enterprise profit of enterprise product can be increased.
Utility model content
AISG agreement that what the utility model object was just to provide that a kind of data can return meet, meet multiple speed, reliable AISG tower amplifier OOK modulation-demodulation circuit.
The AISG tower amplifier OOK modulation-demodulation circuit providing a kind of data to return of the present utility model, it comprises coaxial cable, DC power supply, inductance, electric capacity, modulator, demodulator and LC band pass filter, described modulator comprises impedance transformer, LC low pass filter, digital switch, two divided-frequency module and resonance modules, one end of described LC band pass filter connects one end of electric capacity, the other end connecting coaxial cable of electric capacity, DC power supply connects the other end of electric capacity by inductance, the other end of described LC band pass filter connects the output of impedance transformer and the input of demodulator, the output of described resonance modules connects the input of two divided-frequency module, the first input end port of the output linking number word switch of two divided-frequency module, second input port ground connection of digital switch, the output port of digital switch connects the input of LC low pass filter, the output of LC low pass filter connects the input of impedance transformer, the output of impedance transformer connects the input of demodulator, the control end of described digital switch is for connecting peripheral single-chip microcomputer signal output part.
Described demodulator comprises amplifier, RC envelope detector and comparator, the output of described impedance transformer connects the input of amplifier, the output of amplifier connects the input of RC envelope detector, the output of RC envelope detector connects the input in the same way of comparator, the reverse input end connection door of comparator is rationed the power supply potential source, and the output of described comparator is used for being connected with peripheral single chip communication interface input.
The utility model specific design has gone out the AISG tower amplifier OOK modulation-demodulation circuit that a kind of data can return, the utility model adopts cheap discrete device to build, not only meet the index request of AISG protocol definition, and material procurement is with low cost, within the scope of total temperature, index is discrete little, be applicable to multiple speed, productibility is strong, adds competitiveness and the enterprise profit of enterprise product.
Accompanying drawing explanation
Fig. 1 is the output spectrum schematic diagram of modulation demodulation system in AISG agreement
Fig. 2 is the structural representation of the AISG tower amplifier modulation-demodulation circuit that a kind of data of the utility model example can return.
F in Fig. 1
0for 2.176MHZ frequency.
Wherein, 1-resonance modules, 2-two divided-frequency module, 3-digital switch, 4-LC low pass filter, 5-impedance transformer, 6-LC band pass filter, 7-amplifier, 8-RC envelope detector, 9-comparator, 10-first input end port, 11-output port, the 12-the second input port, 13-modulator, 14-demodulator, 15-coaxial cable, 16-DC power supply, 17-inductance, 18-electric capacity.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
The AISG tower amplifier OOK modulation-demodulation circuit that a kind of data as shown in Figure 2 can return, it comprises coaxial cable 15, DC power supply 16, inductance 17, electric capacity 18, modulator 13, demodulator 14 and LC band pass filter 6, described modulator 13 comprises impedance transformer 5, LC low pass filter 4, digital switch 3, two divided-frequency module 2 and resonance modules 1, one end of described LC band pass filter 6 connects one end of electric capacity 18, the other end connecting coaxial cable 15 of electric capacity 18, DC power supply 16 connects the other end of electric capacity 18 by inductance 17, the other end of described LC band pass filter 6 connects the output of impedance transformer 5 and the input of demodulator 14, the output of described resonance modules 1 connects the input of two divided-frequency module 2, the first input end port one 0 of the output linking number word switch 3 of two divided-frequency module 2, second input port one 2 ground connection GND of digital switch 3, the output port one 1 of digital switch 3 connects the input of LC low pass filter 4, the output of LC low pass filter 4 connects the input of impedance transformer 5, the output of impedance transformer 5 connects the input of demodulator 14, the control end of described digital switch 3 is for connecting peripheral single-chip microcomputer signal output part.The control signal control figure switch 3 that digital switch 3 sends according to peripheral single-chip microcomputer is switched on or switched off, when peripheral single-chip microcomputer is low level, first input end port one 0 and the output port one 1 of control figure switch 3 are connected, and now digital switch 3 is in on-state; When peripheral single-chip microcomputer is high level, the second input port one 2 of control figure switch 3 is connected with output port one 1, and now digital switch 3 is in off-state.
In technique scheme, described demodulator 14 comprises amplifier 7, RC envelope detector 8 and comparator 9, the output of described impedance transformer 5 connects the input of amplifier 7, the output of amplifier 7 connects the input of RC envelope detector 8, the output of RC envelope detector 8 connects the input in the same way of comparator 9, the reverse input end connection door of comparator 9 is rationed the power supply potential source, and the output of described comparator 9 is used for being connected with peripheral single chip communication interface input.
In technique scheme, make DC power supply 16 by the coupling of inductance 17, electric capacity 18, radiofrequency signal and control signal conllinear.
In technique scheme, described resonance modules 1 adopts frequency to be the crystal resonant module of 4.352MHZ.Described crystal resonant module is built by quartz crystal, resistance, electric capacity, these discrete devices of not gate, the square wave of its output waveform to be frequency be 4.352MHZ.The square wave of 4.352MHZ produces the square wave of 2.176MHZ through two divided-frequency module 2.
In technique scheme, described digital switch 3 adopts triple gate logic switch.
In technique scheme, described LC band pass filter 6 adopts the fertile hereby band pass filter of Bart that bandwidth is 400K, impedance is 50 Ω.
In technique scheme, the impedance in impedance transformer 5 match circuit network is 50 Ω.Impedance transformer 5 is by triode, the push-pull circuit that these discrete devices of resistance are built, and this main circuit will mate the impedance of LC band pass filter 50 Ω.Impedance transformer 5 uses 2 grades of complementary symmetry circuits to raise the input voltage of input signal, avoids signal intermodulation distortion and have matched circuit network 50 Ω impedance.
In technique scheme, amplifier 7 is by triode and resistance, the cascode that this discrete device of electric capacity is built into-collect signal amplifier altogether, it is high that it has input resistance, the low feature of output resistance, applies temperature-compensating, negative feedback, the design such as frequency-selecting amplification overcomes because the discrete and temperature of triode inherent parameters is on the impact of transistor parameter, makes this circuit multiplication factor coherence enhancing.Emitter bias circuit is adopted to decrease the impact of transistor parameter β on amplifier 7 multiplication factor in amplifier 7.
In technique scheme, two divided-frequency module 2 is built by the single channel rising edge D class trigger with clearing and preset function, resistance, electric capacity, these discrete devices of magnetic bead, can carry out two divided-frequency process to the square wave of the 4.352MHZ of input.
In technique scheme, described comparator 9 is by comparator, triode, resistance, and these discrete devices of electric capacity are built.The threshold voltage of comparator 9 applies triode Vbe and ties, there is the characteristic of negative temperature coefficient, can make the threshold voltage of comparator 8 finely tune according to the positive temperature characterisitic of the multiplication factor of amplifier 7 within the scope of total temperature, the demodulation threshold of strong guarantee demodulator circuit meets the requirement reconciling thresholding within the scope of total temperature.
In technique scheme, described RC envelope detector 8 is built by resistance and electric capacity.
The course of work of the present utility model is: signal madulation, resonance modules 1 produces the square wave of 4.352MHZ, the square wave of 2.176MHZ is produced through two divided-frequency module 2, the control signal control figure switch 3 that digital switch 3 sends according to peripheral single-chip microcomputer is switched on or switched off, when peripheral single-chip microcomputer is low level, first input end port one 0 and the output port one 1 of control figure switch 3 are connected, and now digital switch 3 is in on-state; When peripheral single-chip microcomputer is high level, the second input port one 2 of control figure switch 3 is connected with output port one 1, and now digital switch 3 is in off-state.Digital switch 3 output port will export the information of required transmission, and it comprises many frequency components, is namely made up of many different sine wave signals, by other useless sine wave signal of LC low pass filter 4 elimination, retains 2.176MHZ sine wave signal.The signal that LC low pass filter 4 exports is through impedance transformer 5 matched termination 50 ohmage, and signal is exported by two paths, and the first suppresses the outer frequency of passband by LC band pass filter 6, and electric capacity 18 is coupled, and coaxial cable 15 transfers out.Its two be by demodulator modulation signal return return.
Signal receiving: coaxial cable 15 transmits brewed waveform, is coupled by electric capacity 18, disturbs outward through LC band pass filter 6 inhibition zone, again through amplifier 7 amplifying signal, RC envelope detector 8, comparator 9 reduces modulation signal, and reduction modulation signal connects the input interface of peripheral single-chip microcomputer.
The content that this specification is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1. the data AISG tower amplifier OOK modulation-demodulation circuit that can return, it is characterized in that: it comprises coaxial cable (15), DC power supply (16), inductance (17), electric capacity (18), modulator (13), demodulator (14) and LC band pass filter (6), described modulator (13) comprises impedance transformer (5), LC low pass filter (4), digital switch (3), two divided-frequency module (2) and resonance modules (1), one end of described LC band pass filter (6) connects one end of electric capacity (18), the other end connecting coaxial cable (15) of electric capacity (18), DC power supply (16) connects the other end of electric capacity (18) by inductance (17), the other end of described LC band pass filter (6) connects the output of impedance transformer (5) and the input of demodulator (14), the output of described resonance modules (1) connects the input of two divided-frequency module (2), the first input end port (10) of the output linking number word switch (3) of two divided-frequency module (2), second input port (12) ground connection of digital switch (3), the output port (11) of digital switch (3) connects the input of LC low pass filter (4), the output of LC low pass filter (4) connects the input of impedance transformer (5), the output of impedance transformer (5) connects the input of demodulator (14), the control end of described digital switch (3) is for connecting peripheral single-chip microcomputer signal output part.
2. the data according to claim 1 AISG tower amplifier OOK modulation-demodulation circuit that can return, it is characterized in that: described demodulator (14) comprises amplifier (7), RC envelope detector (8) and comparator (9), the output of described impedance transformer (5) connects the input of amplifier (7), the output of amplifier (7) connects the input of RC envelope detector (8), the output of RC envelope detector (8) connects the input in the same way of comparator (9), the reverse input end connection door of comparator (9) is rationed the power supply potential source, the output of described comparator (9) is used for being connected with peripheral single chip communication interface input.
3. a kind of data according to claim 1 AISG tower amplifier OOK modulation-demodulation circuit that can return, is characterized in that: described digital switch (3) adopts triple gate logic switch.
4. a kind of data according to claim 1 AISG tower amplifier OOK modulation-demodulation circuit that can return, is characterized in that: described resonance modules (1) adopts frequency to be the crystal resonant module of 4.352MHZ.
5. a kind of data according to claim 1 AISG tower amplifier OOK modulation-demodulation circuit that can return, is characterized in that: described LC band pass filter (6) adopts the fertile hereby band pass filter of Bart that bandwidth is 400K, impedance is 50 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520022293.3U CN204305021U (en) | 2015-01-13 | 2015-01-13 | The AISG tower amplifier OOK modulation-demodulation circuit that data can return |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520022293.3U CN204305021U (en) | 2015-01-13 | 2015-01-13 | The AISG tower amplifier OOK modulation-demodulation circuit that data can return |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204305021U true CN204305021U (en) | 2015-04-29 |
Family
ID=53110524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520022293.3U Expired - Fee Related CN204305021U (en) | 2015-01-13 | 2015-01-13 | The AISG tower amplifier OOK modulation-demodulation circuit that data can return |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204305021U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105577965A (en) * | 2016-03-10 | 2016-05-11 | 电子科技大学中山学院 | Low-cost adjustable OOK modulation and demodulation circuit following AISG specification |
| CN113489932A (en) * | 2021-07-19 | 2021-10-08 | 广州市保伦电子有限公司 | Device for realizing data, control and power transmission based on same coaxial line |
| CN114422312A (en) * | 2022-03-07 | 2022-04-29 | 富延升电子（福建）有限公司 | Carrier decoding circuit |
-
2015
- 2015-01-13 CN CN201520022293.3U patent/CN204305021U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105577965A (en) * | 2016-03-10 | 2016-05-11 | 电子科技大学中山学院 | Low-cost adjustable OOK modulation and demodulation circuit following AISG specification |
| CN105577965B (en) * | 2016-03-10 | 2018-11-02 | 电子科技大学中山学院 | Low-cost adjustable OOK modulation and demodulation circuit following AISG specification |
| CN113489932A (en) * | 2021-07-19 | 2021-10-08 | 广州市保伦电子有限公司 | Device for realizing data, control and power transmission based on same coaxial line |
| CN114422312A (en) * | 2022-03-07 | 2022-04-29 | 富延升电子（福建）有限公司 | Carrier decoding circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204305021U (en) | The AISG tower amplifier OOK modulation-demodulation circuit that data can return | |
| CN104301521B (en) | A kind of modulation system based on mobile audio interface, telecommunication circuit and communication means thereof | |
| CN110266326A (en) | A kind of Integrated Service Digital Network radio-frequency front-end control method and its system based on OOK | |
| CN204014061U (en) | A kind of Wireless amplification equipment | |
| CN101626252B (en) | AISG tower mounted amplifier OOK MODEM circuit | |
| CN203387508U (en) | Novel multi-network-fusion indoor distribution system | |
| CN203192036U (en) | Radiofrequency transceiver module for electronic toll collection system | |
| CN101964679A (en) | Ethernet over Coax equipment power control method and device thereof | |
| CN102217208B (en) | The transmission method of signal, combiner and system | |
| CN105450258A (en) | Wireless bridging carrier communication device | |
| CN103078665A (en) | Combined transmission method based on power line communication and wireless communication | |
| CN204652586U (en) | A kind of GB terrestrial digital TV regenerative modulator | |
| CN101742214A (en) | Method and device for transmitting 100BASE-T Ethernet signals and CATV signals by utilizing coaxial cable | |
| CN212909515U (en) | Radio frequency integrated circuit | |
| CN209731582U (en) | A kind of multi-protocol communication network access system | |
| CN209982489U (en) | Integrated ground data chain equipment | |
| CN204145491U (en) | A kind of network data Integrated Service Digital Network transmitter | |
| CN203261347U (en) | Multichannel wireless audio transmission system | |
| CN206602511U (en) | Control system based on DMR and GSM R dual mode communications | |
| CN208143230U (en) | A kind of Chaotic Synchronous device for intelligent flow meter | |
| CN205051706U (en) | Information transceiver based on wireless network | |
| US9590702B2 (en) | Short range wireless communication using scattering from single wire transmission line | |
| CN204392389U (en) | A kind of modem circuit of remote management of CPE system | |
| CN210491290U (en) | Control panel for intelligent lighting control system | |
| CN204180078U (en) | A kind of 60M Transmission System of Radar Data equipment |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150429 |