CN1921356B - Radio-frequency optical transport module based on TD mode and synchronous control method - Google Patents
Radio-frequency optical transport module based on TD mode and synchronous control method Download PDFInfo
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Abstract
The invention relates to a radio light transmission module based on TD mode and relative synchronous control method. Wherein, the invention collects and analyzes the property and states (lighting power, receiving power and radio power, etc) of radio light transmission module to intelligently adjust the radio output power, etc, to realize best working state. In addition, the invention combines the controller and traditional radio light transmission module, to analyze and detect the laser and radio emitter of radio light transmission device.
Description
Technical field
The present invention relates to fiber optic communication field, particularly a kind of radio-frequency light transmission module and synchronisation control means thereof based on the TD pattern.
Technical background
In existing radio-frequency light transmission module, comprise radio frequency/light input element and light/radio frequency output unit.Wherein, described radio frequency/light input element is made up of radio frequency input matching circuit, high-pass filtering circuit, drive circuit, laser, low-pass filter circuit and FSK modulator.Radiofrequency signal sends to drive circuit through radio frequency input matching circuit and high-pass filtering circuit, also outputs to drive circuit by the control signal of FSK modulation circuit and low-pass filter circuit output, thereby converts radiofrequency signal to light signal and exported by optical fiber; Described light/radio frequency output unit is made up of light/electric transducer, coupling amplifying circuit, high-pass filtering circuit, variable attenuator, output amplifier, low-pass filter circuit and FSK demodulator circuit.Light signal is converted to the signal of telecommunication through light/electric transducer, by the coupling amplifying circuit signal of telecommunication is amplified, to improve signal gain.Obtain fsk modulated signal and radiofrequency signal respectively through low-pass filter circuit and high-pass filtering circuit then.Fsk modulated signal obtains restituted signal through the FSK demodulator circuit.Radiofrequency signal is through adjustable attenuator and output amplifier output radiofrequency signal.
TD-SCDMA (TD SDMA access) technical standard has become one of global 3G standard, and first is confirmed as the China's communications industry standard to TD-SCDMA in three kinds of 3G international standards, and the test of TD-SCDMA technology and network is also being pushed ahead step by step.And existing radio-frequency light transmission module can only transmit up-downgoing radio frequency light along separate routes, can not carry out along separate routes, close the road to the radiofrequency signal of TD pattern, and if the radiofrequency signal of transmission TD pattern, need to increase in addition synchronous detection equipment, Synchronizing Control Devices, time division duplex circuit unit, therefore increase volume, the weight of complete machine, reduced machine performance index, reliability.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, and a kind of radio-frequency light transmission module and synchronisation control means thereof based on the TD pattern that can be applied to 3G (Third Generation) Moblie is provided.
The present invention solves the technical scheme that its technical problem takes: a kind of radio-frequency light transmission module based on the TD pattern, comprise monitoring unit, radio frequency/optical conversion element, light/radio frequency converting unit with two respectively with described radio frequency/optical conversion element, radio frequency attenuator that light/the radio frequency converting unit links to each other, also comprise:
The radio frequency time-division multiplexing unit is used for the time division duplex of radiofrequency signal;
Main synchronous detection unit is used to detect the power and the synchronizing information of input and output radiofrequency signal, and sends the result to synchronous control unit; And
Synchronous control unit is used to judge the synchronous regime of current device, the working method of control synchronized switching element;
Described monitoring unit links to each other with synchronous control unit, radio frequency/optical conversion element, light/radio frequency converting unit and two radio frequency attenuators respectively, and described synchronous control unit also connects radio frequency time-division multiplexing unit and main synchronous detection unit simultaneously.
Also can comprise link to each other with described synchronous control unit, monitoring unit from synchronous detection unit, be used to detect downlink radio-frequency signal power, obtain synchronizing information, send information to synchronous control unit and monitoring unit; Described input from synchronous detection unit links to each other with the described output that is connected with the radio frequency attenuator of light/radio frequency converting unit.
Also can comprise the ALC controller, be used to realize the automatic control of power output steady state value; And the radio-frequency power collecting unit, be used for gathering radio frequency/light transfer link radiofrequency signal power; The input of described radio-frequency power collecting unit links to each other with the input of described radio frequency/optical conversion element, and output is connected to described ALC controller, and the output of described ALC controller turns back in the radio frequency attenuator that links to each other with described radio frequency/optical conversion element.
Described radio frequency time-division multiplexing unit can comprise synchronized switching element, circulator/isolator and interface matched circuit, described circulator/isolator is connected the input of the downstream signal of described synchronized switching element, and link to each other with described synchronization control circuit, the input of described radio frequency/optical conversion element links to each other with described radio frequency isolation switch through described input matching circuit, and the output of described light/radio frequency control circuit is connected to the input of described circulator through output matching circuit.
Also can comprise the local network management unit that links to each other with monitoring unit, be used for communicating to realize Long-distance Control by the network port and according to corresponding protocol and network management center.
The input of the output of described radio frequency/optical conversion element and light/radio frequency converting unit also can respectively be connected with the luminous power collecting unit, described two luminous power collecting units all pass through the luminous power control unit and link to each other with described monitoring unit, and two outputs that also have of described luminous power control unit turn back in described radio frequency/optical conversion element and the light/radio frequency converting unit.
Described radio-frequency power Acquisition Circuit, A/D converter and the synchronous extraction circuit that can comprise connection successively from synchronous detection unit, the input of described radio-frequency power Acquisition Circuit links to each other with the input of described radio frequency time-division multiplexing unit, the output of described synchronous extraction circuit is connected to synchronous control unit, and described A/D converter also outputs in the described monitoring unit simultaneously.
A kind of radio frequency optical transmission synchronisation control means based on the TD pattern is characterized in that, comprises the steps:
A. near-end detects downstream signal by main synchronous detection unit and closes the power and the temporal information at crossing at switch element, produces the synchro switch control signal;
B. described synchro switch control signal is sent to synchronous control unit;
C. when main synchronous mode operating state, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of near-end radiofrequency signal;
D. far-end produces the synchro switch control signal by detect the power and the temporal information of downstream signal at the synchronized switching element rf input port from synchronous detection unit;
E. described synchro switch control signal is sent to synchronous control unit;
F. from the synchronous mode operating state time, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of far end radio frequency signal.
A kind of radio frequency optical transmission synchronisation control means based on the TD pattern is characterized in that, comprises the steps:
A. near-end detects downstream signal by main synchronous detection unit and closes the power and the temporal information at crossing at switch element, produces the synchro switch control signal;
B. described synchro switch control signal is sent to synchronous control unit;
C. when main synchronous mode operating state, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of near-end radiofrequency signal;
D. synchronous control unit sends to monitoring unit with described control signal;
E. monitor described control signal is sent to the FSK modulator, synchronizing information is sent to far-end by FSK monitoring link;
F. far-end recovers described synchronous control signal, and sends the synchronous control signal that recovers to monitoring unit by fsk demodulator;
G. monitoring unit sends synchronizing signal to synchronous control unit;
H. from the synchronous mode operating state time, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of far end radio frequency signal.
Radio-frequency light transmission module of the present invention and synchronisation control means, by in the radio-frequency light transmission module performance, state (comprise luminous power, receive luminous power, radio-frequency power etc.) gather and analyze, can adjust the radio frequency power output of equipment intelligently, make it keep optimum Working.In addition, the present invention is equivalent to control unit and traditional radio-frequency light transmission module integrated, improved the integrated level of system, because monitoring to radio frequency output power signal, luminous power, therefore can analyze, judge and monitor laser, the working condition of radio frequency output device, the device performance of described radio-frequency light transmission apparatus, also just can safeguard radio-frequency light transmission apparatus better.
Description of drawings
Fig. 1 is the theory diagram of embodiment 1 among the present invention;
Fig. 2 is the schematic diagram of embodiment 1 among the present invention;
Fig. 3 is the theory diagram of embodiment 2 among the present invention.
Embodiment
Embodiment 1, be a kind of radio-frequency light transmission module and synchronisation control means thereof based on the TD pattern, described transport module as shown in fig. 1, between radio frequency input/output end port and optical fiber input/output port, the radio frequency attenuator of series connection and radio frequency/optical conversion element constitutes radio frequency/light transfer link, Chuan Lian light/radio frequency converting unit and another radio frequency attenuator constitute light/radio frequency transfer link successively, the radio frequency time-division multiplexing unit is outside to be connected with the I/O port of radiofrequency signal, inside is connected with the input port of described radio frequency/light transfer link and the delivery outlet of light/radio frequency transfer link respectively, is used for the time division duplex of radiofrequency signal.Main synchronous detection unit is used to detect the power and the synchronizing information of radiofrequency signal, and sends the result to synchronous control unit, and its input is gathered the signal of described radio frequency input/output end port, outputs to synchronous control unit.From synchronous detection unit be used for detecting light/radiofrequency signal that the radio frequency transfer link is exported power, obtain synchronizing information, input links to each other with the output of radio frequency attenuator in light/radio frequency transfer link, and outputs signal to synchronous control unit and monitoring unit respectively.Described synchronous control unit links to each other with described monitoring unit, and be subjected to the control of monitoring unit, by the main synchronous detection unit of input and the signal of sending from synchronous detection unit, judge the synchronous regime of current device, the working method of control synchronized switching element, and the output control signal is given described radio frequency time-division multiplexing unit.Described optical fiber input/output port also is connected with two luminous power collecting units respectively, and gather the optical signal power of input and output respectively, and all output in the described luminous power control unit, when described luminous power control unit links to each other with described monitoring unit, also will the control of radio frequency/light transfer link and light/radio frequency commentaries on classics link be turned back to respectively in described radio frequency/optical conversion element and the light/radio frequency converting unit, be used for difference, to light path control unit Output optical power control signal according to optical power signals of being gathered and luminous power set point.The radio-frequency power collecting unit is used to detect the radio-frequency (RF) input power on the described light path, and generation rf power signal, input links to each other with the output of radio frequency attenuator in radio frequency/light transfer link, output is connected in the ALC controller, described ALC controller is used to realize the automatic control of power output steady state value, its output turns back in the radio frequency attenuator in described radio frequency/light transfer link, simultaneously, described radio-frequency power collecting unit also can send to collection result in the described monitoring unit, described monitoring unit is used for the signal of whole radio-frequency light transmission module each several part is realized monitoring and control, also output a control signal to simultaneously in described two radio frequency attenuators, also have a local network management unit also to link to each other in addition, be used for communicating to realize Long-distance Control by the network port and according to corresponding protocol and network management center with described monitoring unit.
Further, as shown in the schematic diagram of present embodiment among Fig. 2:
Described radio frequency/optical conversion element comprises drive circuit 6, laser 7, and preferably includes low-pass filtering 12 and FSK modulator 13.Radiofrequency signal is received by antenna, sends to laser 7 through overdrive circuit 6, converts light signal to, simultaneously the data flow of monitoring is also sent into laser 7 through FSK modulation 13 and low-pass filtering 12 and converts light signal to and send.
Described light/radio frequency converting unit comprises photoelectric switching circuit 23 (can adopt the PIN photoelectric tube), coupling amplifying circuit 24, filter circuit 25, three grades of radio frequency amplifying circuits 26,28,31, impedance matching circuit 30, and preferably include low-pass filter circuit 32 and FSK demodulator circuit 33, between every two-stage radio-frequency amplifying circuit, also respectively insert two-stage numerical-control attenuator 27 and 29.The light signal of being come by optical fiber is through WDM (wavelength division multiplexer wave divisionmultiple) 8 subdivisions, become the signal of telecommunication through opto-electronic conversion 23 again, behind coupling amplifying circuit 24, after three grades of radio frequencies amplifications 26,28,31 and secondary numerical control decay 27,29, send by radio-frequency antenna, send into low-pass filter circuit 32 simultaneously and leach low frequency signal and send into fsk demodulator 33 and must arrive the monitor message that the opposite end is brought.
Described main synchronous detection unit comprises power detection and synchronous extraction circuit 18 (separately not indicating among the figure), wherein, power-sensing circuit detects the power and the temporal information of closing crossing input radio frequency signal, is sent in the described synchronization control circuit 17 by synchronous extraction circuit.
Describedly comprise radio-frequency power Acquisition Circuit 20, A/D change-over circuit 21 and synchronous extraction circuit 22 from synchronous detection unit, power and temporal information that radio-frequency power Acquisition Circuit 20 is gathered circulator 19 input radio frequency signals are also sent in the synchronization control circuit 17 by synchronous extraction circuit 22 after described A/D change-over circuit 21 conversions.
Described synchronous control unit comprises synchronization control circuit 17, extracts synchronous power and the temporal information of principal and subordinate by synchronous extraction circuit 18,22, and accepts the instruction of supervisory circuit 16, and circulator 19 and synchronized switching element 1 are controlled.
Described monitoring unit comprises supervisory circuit 16, includes described luminous power control unit in the supervisory circuit 16, is used for the difference according to optical power signals of being gathered and luminous power set point, to radio frequency attenuator 4,29 output radio-frequency power control signals.
Described radio-frequency power collecting unit comprises radio-frequency power Acquisition Circuit 9 and A/D change-over circuit 11.Rf power signal in the radio frequency that described radio-frequency power Acquisition Circuit 9 collects/light transfer link, after converting digital signal to, A/D converter 11 sends in the supervisory circuit 16, described synchronous control unit can read the rf power signal that radio-frequency power Acquisition Circuit 9 is sent by described supervisory circuit 16 indirectly, but because of the synchronous detecting that has main synchronous detection unit 1 to realize to the radio frequency signal power, so, only when the signal of main synchronous detection unit goes wrong, just select for use the rf power signal of radio-frequency power collecting unit to carry out Synchronization Control.Described luminous power collecting unit comprises luminous power Acquisition Circuit 14/34 and A/D converter 15/35.Described radio-frequency power Acquisition Circuit 9,20 and luminous power Acquisition Circuit 14,34 all adopt the integrated power chip, for example AD8362 etc.A/D converter 11,15,21,35 adopts the A/D conversion chips, for example TLC1543 etc.
In the present embodiment, also comprise the local network management unit, be connected, be used for monitoring unit and communicate to realize Long-distance Control by the network port and according to corresponding protocol and network management center with monitoring unit.Described local network management unit 36 comprises RS232 transceiving chip, RS485 transceiving chip, and wherein, described RS232 transceiving chip adopts MAX232, and described RS485 transceiving chip adopts MAX1487E.
Based on above-mentioned radio-frequency light transmission module, can adopt following radio frequency optical transmission synchronisation control means based on the TD pattern, near-end adopts main synchronization detecting method, far-end adopts from synchronization detecting method, be specially: near-end detects downstream signal by main synchronous detection unit and closes the power and the temporal information at crossing at switch element, and produces the synchro switch control signal; Described synchro switch control signal is sent to synchronous control unit; When main synchronous mode operating state, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of near-end radiofrequency signal; Far-end passes through to detect power and the temporal information of downstream signal at the synchronized switching element rf input port from synchronous detection unit, and produces the synchro switch control signal; Described synchro switch control signal is sent to synchronous control unit; From the synchronous mode operating state time, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of far end radio frequency signal.
Embodiment 2, at first another kind is described based on the radio frequency optical transmission synchronisation control means of TD pattern, in the described method, near-end adopts main synchronization detecting method, far-end adopts and the direct synchronous method of the synchronizing signal of near-end, be specially: near-end detects downstream signal by main synchronous detection unit and closes the power and the temporal information at crossing at switch element, produces the synchro switch control signal; Described synchro switch control signal is sent to synchronous control unit; When main synchronous mode operating state, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of near-end radiofrequency signal; Synchronous control unit sends to monitoring unit with described control signal; Monitoring unit sends to FSK modulator 13 with described control signal, by FSK monitoring link synchronizing information is sent to far-end; Far-end recovers described synchronous control signal, and sends the synchronous control signal that recovers to monitoring unit by fsk demodulator 33; Monitoring unit sends synchronizing signal to synchronous control unit; From the synchronous mode operating state time, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of far end radio frequency signal.Because, do not need described participation in the present embodiment method from synchronous detection unit, can in the radio-frequency light transmission module described in the embodiment 1, save from synchronous detection unit, as shown in Figure 3, thereby in the input of having saved this part hardware, still can realize the Synchronization Control of radio frequency optical transmission, therefore, be a kind of cheaply based on the radio frequency optical transmission synchronisation control means of TD pattern.
In addition, in the present invention, between described monitoring unit and the network management unit, the order bag has adopted a kind of complete frame structure, to guarantee the correct of transmission.It is as follows that the frame of a complete order bag is formed structure:
The beginning flag unit: 1 byte degree, the beginning of a complete order bag of expression is fixed as 16 systems and counts 0X7E.
Fixed word: 1 byte length, be used for module identification, be fixed as 16 systems and count 0X06.
Module's address: 1 byte length, be used to discern a plurality of radio-frequency light transmission apparatus in the consolidated network, the address of each equipment is unique in the network.The order that each equipment parsing module address equates with self address.
The order numbering: 1 byte length, the unique identification of order, the order numbering in the response command is identical with the order numbering that receives order.
Keep the position: 1 byte length is set to 0x00.(can be used as if desired herein and reply the sign of shaking hands)
Command body length: 1 byte length, the physical length of order data is a unit with the byte.
Order data: elongated, actual this is ordered the command information of required band.
Stick unit: 2 bytes keep (if desired, being the CRC16 check digit herein).
The end mark unit: 1 byte length, the end of a complete order bag of expression is fixed as 16 systems and counts 0X7F.For the postamble that prevents previous frame and the frame head of next frame are obscured, special with beginning flag and end mark differentiation.
Between monitoring unit and network management unit, the communication mode of employing can adopt the communication mode of (or asynchronous) full duplex (or half-duplex) synchronously, and 8 data bit, 1 position of rest, no parity check position, speed are 19200BPS (perhaps other baud rates).The unified complement representation that adopts of the sign bit of the signed number in transmission course.Network management center or radio-frequency light transmission apparatus preferably carry out authentication process after receiving packet.Described authentication process comprises: beginning flag/end mark verification, the verification of order numbering, command data length verification.If above-mentioned any one link verification not by think failed authentication, the recipient should reply error flag to transmit leg according to actual conditions.
More than radio-frequency light transmission module and the synchronisation control means thereof based on the TD pattern provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. radio-frequency light transmission module based on the TD pattern, comprise monitoring unit, radio frequency/optical conversion element, light/radio frequency converting unit with two respectively with described radio frequency/optical conversion element, radio frequency attenuator that light/the radio frequency converting unit links to each other, it is characterized in that: also comprise:
The radio frequency time-division multiplexing unit is used for the time division duplex of radiofrequency signal;
Main synchronous detection unit is used to detect the power and the synchronizing information of input and output radiofrequency signal, and sends the result to synchronous control unit; And
Synchronous control unit is used to judge the synchronous regime of current device, the working method of control synchronized switching element;
Described monitoring unit links to each other with synchronous control unit and two radio frequency attenuators respectively, described synchronous control unit also connects radio frequency time-division multiplexing unit and main synchronous detection unit simultaneously, the input that described radio frequency time-division multiplexing unit has also connected the radio frequency attenuator that links to each other with described radio frequency/optical conversion element respectively with the output of described light/radio frequency attenuator that the radio frequency converting unit links to each other.
2. the radio-frequency light transmission module based on the TD pattern according to claim 1, it is characterized in that: also comprise link to each other with described synchronous control unit, monitoring unit from synchronous detection unit, be used to detect downlink radio-frequency signal power, obtain synchronizing information, send information to synchronous control unit and monitoring unit; Described input from synchronous detection unit links to each other with the described output that is connected with the radio frequency attenuator of light/radio frequency converting unit.
3. the radio-frequency light transmission module based on the TD pattern according to claim 1 and 2 is characterized in that: also comprise:
The ALC controller is used to realize the automatic control of power output steady state value; And
The radio-frequency power collecting unit is used for gathering radio frequency/light transfer link radiofrequency signal power;
The input of described radio-frequency power collecting unit links to each other with the input of described radio frequency/optical conversion element, and output is connected to described ALC controller, and the output of described ALC controller turns back in the radio frequency attenuator that links to each other with described radio frequency/optical conversion element.
4. the radio-frequency light transmission module based on the TD pattern according to claim 1 and 2, it is characterized in that: also comprise the local network management unit that links to each other with monitoring unit, be used for communicating to realize Long-distance Control by the network port and according to corresponding protocol and network management center.
5. the radio-frequency light transmission module based on the TD pattern according to claim 1 and 2, it is characterized in that: the input of the output of described radio frequency/optical conversion element and light/radio frequency converting unit also respectively is connected with the luminous power collecting unit, described two luminous power collecting units all pass through the luminous power control unit and link to each other with described monitoring unit, and two outputs that also have of described luminous power control unit turn back in described radio frequency/optical conversion element and the light/radio frequency converting unit.
6. the radio-frequency light transmission module based on the TD pattern according to claim 2, it is characterized in that: described radio-frequency power Acquisition Circuit, A/D converter and the synchronous extraction circuit that connects successively that comprise from synchronous detection unit, the input of described radio-frequency power Acquisition Circuit links to each other with the input of described radio frequency time-division multiplexing unit, the output of described synchronous extraction circuit is connected to synchronous control unit, and described A/D converter also outputs in the described monitoring unit simultaneously.
7. the radio frequency optical transmission synchronisation control means based on the TD pattern is characterized in that, comprises the steps:
A. near-end detects power and the temporal information of downstream signal at the radio frequency input/output end port by main synchronous detection unit, produces the synchro switch control signal;
B. described synchro switch control signal is sent to synchronous control unit;
C. when main synchronous mode operating state, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of near-end radiofrequency signal;
D. far-end produces the synchro switch control signal by detect the power and the temporal information of downstream signal at the synchronized switching element rf input port from synchronous detection unit;
E. described synchro switch control signal is sent to synchronous control unit;
F. from the synchronous mode operating state time, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of far end radio frequency signal.
8. the radio frequency optical transmission synchronisation control means based on the TD pattern is characterized in that, comprises the steps:
A. near-end detects power and the temporal information of downstream signal at the radio frequency input/output end port by main synchronous detection unit, produces the synchro switch control signal;
B. described synchro switch control signal is sent to synchronous control unit;
C. when main synchronous mode operating state, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of near-end radiofrequency signal;
D. synchronous control unit sends to monitoring unit with described control signal;
E. monitor described control signal is sent to the FSK modulator, synchronizing information is sent to far-end by FSK monitoring link;
F. far-end recovers described synchronous control signal, and sends the synchronous control signal that recovers to monitoring unit by fsk demodulator;
G. monitoring unit sends synchronizing signal to synchronous control unit;
H. from the synchronous mode operating state time, synchronous control unit sends to synchronized switching element with described control signal, finishes the multiplex/demultiplex of far end radio frequency signal.
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| CN107608263A (en) * | 2017-09-08 | 2018-01-19 | 沈阳航天新光集团有限公司 | A kind of passive communication switching system based on RFID |
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