CN103401613A - Digital microwave transmission device and method - Google Patents
Digital microwave transmission device and method Download PDFInfo
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- CN103401613A CN103401613A CN2013103328827A CN201310332882A CN103401613A CN 103401613 A CN103401613 A CN 103401613A CN 2013103328827 A CN2013103328827 A CN 2013103328827A CN 201310332882 A CN201310332882 A CN 201310332882A CN 103401613 A CN103401613 A CN 103401613A
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Abstract
The invention relates to a digital microwave transmission device and a digital microwave transmission method. The device comprises a main unit and a remote unit which are arranged at each station. The main unit and the remote unit at one station are connected through an optical fiber cable. Remote units between two stations are wirelessly connected. Each main unit comprises an interface processing unit, a main transmission link, a main receiving link, a main wavelength division unit and a remote control unit. Each remote unit comprises a remote wavelength division unit, a remote transmission link, a remote receiving link, a duplexer unit and an antenna unit. The main unit adopts digital modulation-demodulation and shaping filtering to convert user digital signals into optical signals which are transmitted through optical fibers. After the optical signals reach the remote unit, the optical signals are restored to radio-frequency signals which are converted into wireless signals through power amplification for transmission. The device provided by the invention has the advantages that the transmission distance is long, the cost is low, the main functions are completed on the main units, the power consumption of the remote units is low, and the problems that the transmission through optical fibers at complex terrains is inconvenient to realize and the loss of long-distance wireless transmission is great are solved.
Description
Technical field
The present invention relates to Optical Fiber Transmission and microwave transmission field, particularly relate to a kind of device and method that utilizes simultaneously optical fiber and microwave transmission data.
Background technology
Along with the develop rapidly of mobile communication technology, mobile subscriber's quantity and user bandwidth demand improve rapidly, and the construction of base station has been proposed to new requirement.The raising of mobile subscriber's data bandwidth on wireless channel, often mean the shortening of wireless channel distance, the dwindling of base station range, and the increasing sharply of base station number; Increasing sharply of base station number, also proposed very high requirement for the cost of base station, the overall dimension of base station.Pass through Radio of Fiber Technology, the data of complexity can be processed and signal conversion centre station processing, at central station, base band data is modulated to radio frequency or intermediate-freuqncy signal, then be coupled to optical fiber transmission and deliver to telepoint base station, base station only need be amplified through simple opto-electronic conversion and signal, just can be transmitted directly to mobile subscriber terminal.Can greatly simplify the design of traditional base station like this, reach the purpose that reduces volume and reduce costs.
Country implements " broadband China " engineering, accelerates the broadband upgrading of information network, and Fiber to the home to advance cities and towns, realizes the broadband universal service.But in the FTTH extension process, the cloth of optical fiber is placed in some cases and can meets difficulty, and built on stilts also not allow to dig ground in particular cases buried neither allowing, and can only carry out the relaying transmission by the mode of wireless transmission.
Utilize optical fiber and Radio Transmission Technology, better combine the large distance of Optical Fiber Transmission capacity and the easy addressing of the wireless transmission fast advantage of building a station.But this area lacks the relevant art means at present.
Summary of the invention
The object of the invention is to utilize optical fiber and Radio Transmission Technology, a kind of Techniques Used in Digital Microwave Transmission device and method is provided.
Technical scheme of the present invention provides a kind of Techniques Used in Digital Microwave Transmission device, be included in master unit and far-end unit that each website arranges, between master unit on website and far-end unit, by an optical fiber, connect, the far-end unit between two websites adopts wireless connections;
Described master unit comprises interface processing unit, main transmission link, main receiver, main wavelength division unit and Remote Control Unit,
Main transmission link comprises Digital Modulation unit, D/A conversion unit, up-conversion unit, combiner unit, amplifying unit and the light-modulating cell that connects successively;
Main receiver comprises photo detecting unit, compensation amplifying unit, branching unit, down-converter unit, AD conversion unit and the digital demodulation unit that connects successively;
Remote Control Unit comprises main control unit, FSK modulating unit, FSK demodulating unit, and main control unit is connected respectively with FSK modulating unit, FSK demodulating unit, and the FSK modulating unit connects combiner unit, and the FSK demodulating unit connects branching unit;
The interface processing unit connects respectively Digital Modulation unit and digital demodulation unit, and main wavelength division unit connects respectively light-modulating cell and photo detecting unit;
Described far-end unit comprises that far-end wavelength division unit, far-end send link, far-end receiver, Duplexer Unit and antenna element,
Far-end sends link and comprises photo detecting unit, compensation amplifying unit, branching unit, up-conversion unit and the power amplification unit that connects successively;
The far-end receiver comprises low noise amplification unit, down-converter unit, combiner unit, filter and amplification unit and the light-modulating cell that connects successively;
The far-end controlled cell comprises controlled cell, FSK modulating unit, FSK demodulating unit, and controlled cell is connected respectively with FSK modulating unit, FSK demodulating unit, and the FSK modulating unit connects combiner unit, and the FSK demodulating unit connects branching unit;
Antenna connects Duplexer Unit, and Duplexer Unit connects respectively power amplification unit and low noise amplification unit, and the far-end wavelength division unit connects respectively photo detecting unit, light-modulating cell.
The present invention also provides the Techniques Used in Digital Microwave Transmission method that realizes according to above-mentioned Techniques Used in Digital Microwave Transmission device, and the process that the local terminal website is transferred to the opposite end website is as follows,
Step 1, in the master unit of local terminal website, after by the interface processing unit, the original user data bag being encapsulated as to the microwave data frame, input main transmission link, through the Digital Modulation cells modulate, be treated to the digital baseband carrier signal, through D/A conversion unit, obtain the Analog Baseband carrier signal, the Analog Baseband carrier signal obtains radio-frequency carrier signal through the up-conversion unit; Main control unit generates the control signal frame according to default parameters, and the FSK modulating unit carries out the FSK modulation to the control signal frame, becomes the simulation fsk signal; Radio-frequency carrier signal and simulation fsk signal output to light-modulating cell in combiner unit mixing gained multicarrier radiofrequency signal after amplifying unit, light-modulating cell is transformed to light signal to the multicarrier radiofrequency signal and exports after main wavelength division unit is multiplexing;
Step 2, the light signal that the master unit of local terminal website sends is through the far-end unit of Optical Fiber Transmission to the local terminal website, through far-end wavelength division unit input far-end, send link, photo detecting unit is reduced to the multicarrier radiofrequency signal by light signal, through the compensation amplifying unit, compensate amplification, then through branching unit filtering, process radiofrequency signal and the fsk signal that obtains the user; Fsk signal is reduced to controlled data to controlled cell through the FSK demodulating unit; User's radiofrequency signal becomes microwave signal after the mixing of up-conversion unit, after power amplification unit amplifies, through Duplexer Unit and antenna transmission, go out;
step 3, the microwave signal that in the far-end unit of opposite end website, antenna reception sends to antenna in the far-end unit of local terminal website, through Duplexer Unit, enter the far-end receiver, microwave signal obtains radiofrequency signal through low noise amplification unit and down-converter unit, it is the multicarrier radiofrequency signal that the monitor data modulation gained monitoring fsk signal that this radiofrequency signal and controlled cell are replied closes road at combiner unit, gained multicarrier radiofrequency signal outputs to light-modulating cell after amplifying unit after filtering, light-modulating cell is transformed to light signal to the multicarrier radiofrequency signal and exports after long-range wavelength division unit is multiplexing,
Step 4, the light signal that sends in the far-end unit of opposite end website is through the master unit of Optical Fiber Transmission to the opposite end website, through the main receiver of main wavelength division unit input, photo detecting unit is reduced to the multicarrier radiofrequency signal by light signal, through the compensation amplifying unit, compensate amplification, then through branching unit filtering, process the radio-frequency carrier signal and the FSK that obtain the user and receive signal; FSK receives signal and after the FSK demodulating unit, obtains the control signal frame that far-end unit is replied, and by main control unit, resolves to the control reply parameter; User's radio-frequency carrier signal obtains the Analog Baseband carrier signal through down-converter unit, through AD conversion unit, obtain the digital baseband carrier signal, then at the digital demodulation unit demodulating and decoding, become the microwave data frame, the interface processing unit carries out decapsulation to the microwave data frame, is reduced to the original user data bag.
The present invention relates to a kind of apparatus and method of utilizing optical fiber and wirelessly transmitting data, adopt digital modulation and demodulation and molding filtration, the number signal is become to radiofrequency signal and on optical fiber, transmit, after far-end, be reduced to radiofrequency signal, through power amplification, become transmission of wireless signals.Combine fully that the Optical Fiber Transmission capacity is large, loss is little, anti-electromagnetic interference capability is strong and wireless transmission is not subjected to complex-terrain constraint, the fast advantage of building a station, system long transmission distance, cost are low, and major function all completes at master unit, and far-end unit is low in energy consumption.The inconvenience of complex-terrain Optical Fiber Transmission and the large problem of remote wireless transmission loss have been solved.
The accompanying drawing explanation
Fig. 1 is the principle assumption diagram of the embodiment of the present invention.
Fig. 2 is the MU structured flowchart of the embodiment of the present invention.
Fig. 3 is the RU structured flowchart of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, describe technical solution of the present invention in detail.
The invention provides a kind of device that utilizes optical fiber and microwave transmission broadband signal, this device combines the advantage of optical fiber and microwave transmission.If device is realized signal transmission between two websites, these two websites are designated as website 1, website 2.System is full duplex mode, and the method that data slave site 1 passes to website 2 is identical with the method that data slave site 2 passes to website 1.As shown in Figure 1, device comprises the master unit MU(main unit of optical fiber radio) and the far-end unit RU(remote unit of optical fiber radio), at website 1 and website 2, respectively lay a cover, be labeled as respectively MU1, RU1 and MU2, RU2.In a website, between master unit and far-end unit, receiving and transmitting signal and control signal are all transmitted on an optical fiber, and what on optical fiber, transmit is the radiofrequency signal of being mixed by a plurality of frequency ranges.MU is modulated to baseband signal on radio-frequency carrier, and the laser modulation by light-modulating cell is transferred to RU to light carrier, and RU is reduced to radio-frequency carrier signal to the signal on light carrier, then is demodulated into baseband signal.Between two websites, adopt wireless mode to connect, namely the far-end unit between two websites adopts the Wireless microwave signal to connect.
By device provided by the invention, Ethernet data is through Digital Modulation, digital-to-analogue conversion and up-convert to radiofrequency signal, through direct light intensity modulation laser, become light signal and send to far-end, far-end is reduced to radiofrequency signal through laser detector, radiofrequency signal, through up-converting to the microwave frequency band signal, is launched through power amplifier.Far-end receives wireless signal through low noise amplification, after down-conversion, become radiofrequency signal and become light signal through direct light intensity modulator, light signal becomes radiofrequency signal through Optical Fiber Transmission to main single process laser detector, through down-conversion, analog-to-digital conversion, digital demodulation, becomes original Ethernet data.Master unit is that by handle, to control data be that radiofrequency signal passes to far-end through optical fiber through the FSK modulation conversion to the transmission of control signal between far-end unit, and far-end is reduced to the control data after the FSK demodulation.
The MU structured flowchart as shown in Figure 2, comprises interface processing unit, main transmission link, main receiver, main wavelength division unit and Remote Control Unit,
Main transmission link comprises Digital Modulation unit, D/A conversion unit, up-conversion unit, combiner unit, amplifying unit and the light-modulating cell that connects successively;
Main receiver comprises photo detecting unit, compensation amplifying unit, branching unit, down-converter unit, AD conversion unit and the digital demodulation unit that connects successively;
Remote Control Unit comprises main control unit, FSK modulating unit, FSK demodulating unit, and main control unit is connected respectively with FSK modulating unit, FSK demodulating unit, and the FSK modulating unit connects combiner unit, and the FSK demodulating unit connects branching unit;
The interface processing unit connects respectively Digital Modulation unit and digital demodulation unit, and main wavelength division unit connects respectively light-modulating cell and photo detecting unit.
Each several part is described as follows:
The interface processing unit, receive the original user data bag of Ethernet data be provided, and the original user data bag is encapsulated as to the microwave data frame; Simultaneously the microwave data frame that receives is carried out to decapsulation, become the original user data bag;
Main transmission link (MU sends link), the microwave data frame is modulated to the process of light signal;
Main receiver (MU receiver), light signal is demodulated into the process of microwave data frame;
Wavelength division unit, sending and receiving different wave length light signal close wave separater, namely sending light signal and receiving optical signals, close transmitted in both directions on Lu Zaiyi root optical fiber, the wavelength division unit in MU can be described as main wavelength division unit;
Remote Control Unit, carry out parameter configuration and condition monitoring to RU.
Wherein,
Remote Control Unit comprises:
Main control unit, become control signal to default parameters, and the composition control signaling frame sends; The control signal frame that simultaneously RU is returned resolves to inner control reply parameter and returns.During concrete enforcement, generally can adopt software mode that user interface is provided, be convenient to user's parameters, the inner parameter that returns also can show so that the user checks by user interface.
The FSK modulating unit, the control signal frame that main control unit is sent carries out the FSK modulation, becomes the simulation fsk signal; The control signal frame generally adopts the form of binary system control signal Frame.
The FSK demodulating unit, receive signal to the FSK from the branching unit input and carry out demodulation, and is reducible for comprising binary control signal frame of controlling reply parameter.
MU sends link and comprises:
The Digital Modulation unit, process the microwave data frame of interface processing unit output through coding, mapping modulation, molding filtration, convert the digital baseband carrier signal to, i.e. numerical chracter after moulding;
D/A conversion unit, carry out digital-to-analogue conversion to the digital baseband carrier signal of Digital Modulation unit output, becomes the Analog Baseband carrier signal;
The up-conversion unit, through the quadrature mixing, become radio-frequency carrier signal to the Analog Baseband carrier signal of D/A conversion unit output;
Combiner unit, close road to the simulation fsk signal of the radio-frequency carrier signal of up-conversion unit output and the output of FSK modulating unit, becomes the multicarrier radiofrequency signal ，Ji He road signal of carrying different frequency;
Amplifying unit, amplify processing to combiner unit output De He road signal, improves output power signal, the multicarrier radiofrequency signal after being amplified;
Light-modulating cell, carry out direct light intensity modulation to the multicarrier radiofrequency signal of amplifying unit output, and the multicarrier radiofrequency signal is carried on light wave, and output optical signal is to wavelength division unit.
The MU receiver comprises:
Photo detecting unit, receive from the light signal of wavelength division unit input, and the signal on light wave is reduced to the multicarrier radiofrequency signal;
The compensation amplifying unit, amplify the multicarrier radiofrequency signal of photo detecting unit output to process, in order to the loss of compensating light link and photo detecting unit;
Branching unit, make to compensate the filter of the multicarrier radiofrequency signal of amplifying unit output through different frequency range, is divided into radio-frequency carrier signal and FSK and receives signal;
Down-converter unit, through analog frequency mixing, become the Analog Baseband carrier signal to the radio-frequency carrier signal of branching unit output;
AD conversion unit, the Analog Baseband carrier signal becomes the digital baseband carrier signal through analog-to-digital conversion;
Digital demodulation unit, the digital baseband carrier signal becomes the microwave data frame through equalizer, solution mapping, decoding, then outputs to the interface processing unit.
As shown in Figure 3, it comprises that far-end wavelength division unit, far-end send link, far-end receiver, Duplexer Unit and antenna element to the RU structured flowchart,
Far-end sends link and comprises photo detecting unit, compensation amplifying unit, branching unit, up-conversion unit and the power amplification unit that connects successively;
The far-end receiver comprises low noise amplification unit, down-converter unit, combiner unit, filter and amplification unit and the light-modulating cell that connects successively;
The far-end controlled cell comprises controlled cell, FSK modulating unit, FSK demodulating unit, and controlled cell is connected respectively with FSK modulating unit, FSK demodulating unit, and the FSK modulating unit connects combiner unit, and the FSK demodulating unit connects branching unit;
Antenna connects Duplexer Unit, and Duplexer Unit connects respectively power amplification unit and low noise amplification unit, and the far-end wavelength division unit connects respectively photo detecting unit, light-modulating cell.
Each several part is described as follows:
Wavelength division unit, close wave separater to the light signal of sending and receiving, namely sending light signal and receiving optical signals, closes transmitted in both directions on Lu Zaiyi root optical fiber, and the wavelength division unit in RU can be described as the far-end wavelength division unit;
Far-end sends link (RU sends link), and light signal is converted to the process of microwave signal;
Far-end receiver (RU receiver), microwave signal is converted to the process of light signal;
Duplexer Unit, receive and the isolation of launched microwave signal;
Antenna element, transmit and receive the microwave electromagnetic waves of free space;
The far-end controlled cell, the control command of response MU to RU, and the state information of feedback RU is to MU;
Wherein,
Remote Control Unit comprises:
Controlled cell, the control signal frame that sends according to MU resolves to inner parameter, carries out corresponding control command; The monitor data composition control signaling frame of feedback states information is returned;
The FSK modulating unit, the control signal frame that controlled cell is returned carries out the FSK modulation, becomes the monitoring fsk signal of simulation;
The FSK demodulating unit, carry out demodulation to the fsk signal from the branching unit input, and is reducible for comprising binary control signal frame of controlled data.
RU sends link and comprises:
Photo detecting unit, receive the light signal that wavelength division unit gained MU sends, and the signal on light wave is reduced to the multicarrier radiofrequency signal;
The compensation amplifying unit, amplify the multicarrier radiofrequency signal of photo detecting unit output to process, in order to the loss of compensating light link and photo detecting unit;
Branching unit, the multicarrier radiofrequency signal of compensation amplifying unit output, through the filter of different frequency range, are divided into user's radiofrequency signal and fsk signal;
The up-conversion unit, through uppermixing, become the microwave frequency band radiofrequency signal to the user's of branching unit output radiofrequency signal, i.e. microwave signal;
Power amplification unit, improve the microwave signal power of up-conversion unit output, reaches the transmitting power requirement, and output to Duplexer Unit.
The RU receiver comprises:
The low noise amplification unit, amplify the microwave signal that receives from Duplexer Unit with lower noise;
Down-converter unit, become radiofrequency signal to the microwave signal of low noise amplification unit output through lower mixing;
Combiner unit, be combined into the multicarrier radiofrequency signal to the monitoring fsk signal of the radiofrequency signal of down-converter unit output and the output of FSK modulating unit;
The filter and amplification unit, spuious and interference signal, amplify useful multicarrier radiofrequency signal to the multicarrier radiofrequency signal filtering of combiner unit output;
Light-modulating cell, through direct light intensity modulation, become the multicarrier radiofrequency signal of filter and amplification unit output light signal and output to wavelength division unit.
The specific implementation of above each unit is prior art, while specifically implementing, can sell product with reference to respective market, and for example light-modulating cell can adopt laser to realize that radiofrequency signal arrives the conversion of light signal.
The present invention proposes a kind of method of Techniques Used in Digital Microwave Transmission, the method step is as follows:
Step 1, in the master unit of local terminal website, the data of user interface and opposite end website monitoring management data are multiplexing through intersecting, and according to the microwave frame form, encapsulate framing, are designated as the microwave data frame.The microwave data frame is modulated to numerical chracter after the processing such as coding, mapping, molding filtration, through digital-to-analogue conversion, be the difference analogue baseband signal, and this baseband signal is carried carrier information, is designated as the Analog Baseband carrier signal.The Analog Baseband carrier signal, through up-converting to radio-frequency carrier signal, is designated as radiofrequency signal 1.After the control signal frame carries out the FSK modulation, become the simulation fsk signal, be designated as radiofrequency signal 2.Radiofrequency signal 1 is closed road with radiofrequency signal 2, mix gained multicarrier radiofrequency signal through being amplified to certain power level, output to laser, laser adopts direct light intensity modulation, the multicarrier radiofrequency signal is transformed to light signal and after wavelength division unit is multiplexing, exports.
In embodiment, take website 1 as the local terminal website, website 2 describes as the situation of opposite end website, the implementation of reverse transfer is identical.MU1 processes through interface compression by the digital signal that the interface processing unit can provide the original user data bag, the original user data bag is encapsulated as to the microwave data frame according to coded modulation length with the frequency of 8KHz, through the Digital Modulation unit, carry out scrambling coding, quadrature amplitude modulation (QAM), molding filtration and become the digital carrier symbol, after D/A conversion unit carries out the high-speed digital-analog conversion, become quadrature base band carrier signal, the baseband carrier signal carries out the quadrature mixing through the up-conversion unit, and up-converting to center frequency point is the radio-frequency carrier signal 1 of 2100MHz.MU1 is that speed is the serial communication data of 19.2KHz to the control signal of RU such as parameter setting, status poll data, through FSK(Frequency-shift keying) become the radiofrequency signal 2 of 433.9MHz after modulation.Radiofrequency signal 1 and radiofrequency signal 2 after combiner unit closes road after filtering amplifying unit be amplified to certain power level, be converted to the light signal that wavelength is 1550nm through direct light-modulating cell.
Step 2, the optical signal transmission that the master unit of local terminal website sends, to the far-end unit of local terminal website, in far-end unit, after wavelength division unit, is reduced to the multicarrier radiofrequency signal to receiving optical signals; The multicarrier radiofrequency signal is compensated to amplification, in order to the Insertion Loss of compensating light link attenuation and laser, obtain the multicarrier radiofrequency signal of moderate strength, process after filtering, obtain user's radiofrequency signal and fsk signal.Fsk signal is reduced to controlled data to local controlled cell after the FSK demodulation.The subscribers carrier signal, after the up-conversion mixing, becomes the microwave frequency band signal, through power amplification, to transmit power level, through Duplexer Unit and antenna transmission, goes out.
In embodiment, the light signal that the photo detecting unit of Ru1 launches Mu1 is surveyed reception, be reduced to the hybrid radio frequency signal, through the overcompensation amplifying unit, carry out compensating light link and the laser power loss to radiofrequency signal, then through the filter of branching unit, being divided into radiofrequency signal 1 and the center frequency point that center frequency point is 2100MHz is the radiofrequency signal 2 of 433.9MHz, radiofrequency signal 2 obtains the serial digital signal of 19.2KHz through the FSK demodulating unit, give the local controlled cell of RU.Radiofrequency signal 1 is the microwave signal of 15GHz through the direct uppermixing in uppermixing unit, then through power amplification unit, carries out power amplification and goes out through Duplexer Unit, antenna transmission to transmit power level.
Step 3, in the far-end unit of opposite end website, antenna reception is to microwave signal, microwave small-signal through antenna and Duplexer Unit reduction, after low noise amplification, obtain purer microwave signal, through down-conversion, become the radiofrequency signal of low frequency, signal (namely monitoring fsk signal) after modulating with the monitor data of controlled cell reply closes the multicarrier radiofrequency signal that road is low frequency, close road gained low frequency signal and process through amplifying, enter laser and carry out after the light direct intensity modulation becoming light signal and export after wavelength division unit is multiplexing.
In embodiment, the 15GHz microwave signal that in the antenna reception website 1 of the RU2 of website 2, RU1 sends, process low noise amplification unit carries out low noise amplification, down-converter unit down-converts to the radiofrequency signal 3 that center frequency point is 1700MHz.The RU2 controlled cell returns to the serial digital data of 19.2KHz, through the FSK modulating unit, obtains the radiofrequency signal 4 of 433.7MHz.Radiofrequency signal 3 and radiofrequency signal 4 unit, ECDC road close behind road amplifying unit after filtering and are amplified to suitable power level, through the direct light intensity modulation laser of light-modulating cell, become the light signal that wavelength is 1310nm.
Step 4, the optical signal transmission that the far-end unit of opposite end website sends is to the master unit MU of opposite end website 2, in master unit, after the wavelength division unit input, through laser acquisition, be reduced to the multicarrier radiofrequency signal of low frequency, after compensating amplification, process after filtering, obtain FSK and receive signal and user's low frequency signal (being radio-frequency carrier signal).FSK receives signal and after the FSK demodulation, obtains the control signal frame that RU replys, and resolves to the control reply parameter.User's low frequency signal is through down-converting to the Analog Baseband carrier signal, through analog-to-digital conversion, obtain the digital baseband carrier signal, carry out time domain and frequency domain equalization, after the solution map decoding, obtain the microwave data frame, the microwave data frame is carried out to decapsulation and be reduced to user's initial data, be i.e. the original user data bag.
In embodiment, it is the light signal of 1310nm that the MU2 of website 2 receives RU2 institute emission wavelength, through photo detecting unit, be reduced to the hybrid radio frequency signal, through the power loss of overcompensation amplifying unit compensating light link and laser, the filter of process branching unit is divided into radiofrequency signal 3 and radiofrequency signal 4.Radiofrequency signal 4 is demodulated into the Serial Control return data of 19.2KHz through the FSK demodulating unit.Radiofrequency signal 3 is quadrature base band carrier signal through the down-converter unit quadrature frequency conversion, after AD conversion unit, in digital demodulation unit, through matched filtering, adaptive equalization, by the QAM demodulating and decoding, become the microwave data frame, the interface processing unit carries out decapsulation to the microwave data frame, is reduced to primary data information (pdi).
Above-mentioned example is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not run counter to change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify the substitute mode that all should be equivalence, within being included in protection scope of the present invention.
Claims (2)
1. Techniques Used in Digital Microwave Transmission device is characterized in that: be included in master unit and far-end unit that each website arranges, between the master unit on website and far-end unit, by an optical fiber, connect, the far-end unit between two websites adopts wireless connections;
Described master unit comprises interface processing unit, main transmission link, main receiver, main wavelength division unit and Remote Control Unit,
Main transmission link comprises Digital Modulation unit, D/A conversion unit, up-conversion unit, combiner unit, amplifying unit and the light-modulating cell that connects successively;
Main receiver comprises photo detecting unit, compensation amplifying unit, branching unit, down-converter unit, AD conversion unit and the digital demodulation unit that connects successively;
Remote Control Unit comprises main control unit, FSK modulating unit, FSK demodulating unit, and main control unit is connected respectively with FSK modulating unit, FSK demodulating unit, and the FSK modulating unit connects combiner unit, and the FSK demodulating unit connects branching unit;
The interface processing unit connects respectively Digital Modulation unit and digital demodulation unit, and main wavelength division unit connects respectively light-modulating cell and photo detecting unit;
Described far-end unit comprises that far-end wavelength division unit, far-end send link, far-end receiver, Duplexer Unit and antenna element,
Far-end sends link and comprises photo detecting unit, compensation amplifying unit, branching unit, up-conversion unit and the power amplification unit that connects successively;
The far-end receiver comprises low noise amplification unit, down-converter unit, combiner unit, filter and amplification unit and the light-modulating cell that connects successively;
The far-end controlled cell comprises controlled cell, FSK modulating unit, FSK demodulating unit, and controlled cell is connected respectively with FSK modulating unit, FSK demodulating unit, and the FSK modulating unit connects combiner unit, and the FSK demodulating unit connects branching unit;
Antenna connects Duplexer Unit, and Duplexer Unit connects respectively power amplification unit and low noise amplification unit, and the far-end wavelength division unit connects respectively photo detecting unit, light-modulating cell.
2. Techniques Used in Digital Microwave Transmission method of realizing of Techniques Used in Digital Microwave Transmission device according to claim 1, it is characterized in that: the process that the local terminal website is transferred to the opposite end website is as follows,
Step 1, in the master unit of local terminal website, after by the interface processing unit, the original user data bag being encapsulated as to the microwave data frame, input main transmission link, through the Digital Modulation cells modulate, be treated to the digital baseband carrier signal, through D/A conversion unit, obtain the Analog Baseband carrier signal, the Analog Baseband carrier signal obtains radio-frequency carrier signal through the up-conversion unit; Main control unit generates the control signal frame according to default parameters, and the FSK modulating unit carries out the FSK modulation to the control signal frame, becomes the simulation fsk signal; Radio-frequency carrier signal and simulation fsk signal output to light-modulating cell in combiner unit mixing gained multicarrier radiofrequency signal after amplifying unit, light-modulating cell is transformed to light signal to the multicarrier radiofrequency signal and exports after main wavelength division unit is multiplexing;
Step 2, the light signal that the master unit of local terminal website sends is through the far-end unit of Optical Fiber Transmission to the local terminal website, through far-end wavelength division unit input far-end, send link, photo detecting unit is reduced to the multicarrier radiofrequency signal by light signal, through the compensation amplifying unit, compensate amplification, then through branching unit filtering, process radiofrequency signal and the fsk signal that obtains the user; Fsk signal is reduced to controlled data to controlled cell through the FSK demodulating unit; User's radiofrequency signal becomes microwave signal after the mixing of up-conversion unit, after power amplification unit amplifies, through Duplexer Unit and antenna transmission, go out;
step 3, the microwave signal that in the far-end unit of opposite end website, antenna reception sends to antenna in the far-end unit of local terminal website, through Duplexer Unit, enter the far-end receiver, microwave signal obtains radiofrequency signal through low noise amplification unit and down-converter unit, it is the multicarrier radiofrequency signal that the monitor data modulation gained monitoring fsk signal that this radiofrequency signal and controlled cell are replied closes road at combiner unit, gained multicarrier radiofrequency signal outputs to light-modulating cell after amplifying unit after filtering, light-modulating cell is transformed to light signal to the multicarrier radiofrequency signal and exports after long-range wavelength division unit is multiplexing,
Step 4, the light signal that sends in the far-end unit of opposite end website is through the master unit of Optical Fiber Transmission to the opposite end website, through the main receiver of main wavelength division unit input, photo detecting unit is reduced to the multicarrier radiofrequency signal by light signal, through the compensation amplifying unit, compensate amplification, then through branching unit filtering, process the radio-frequency carrier signal and the FSK that obtain the user and receive signal; FSK receives signal and after the FSK demodulating unit, obtains the control signal frame that far-end unit is replied, and by main control unit, resolves to the control reply parameter; User's radio-frequency carrier signal obtains the Analog Baseband carrier signal through down-converter unit, through AD conversion unit, obtain the digital baseband carrier signal, then at the digital demodulation unit demodulating and decoding, become the microwave data frame, the interface processing unit carries out decapsulation to the microwave data frame, is reduced to the original user data bag.
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| CN104009812B (en) * | 2014-05-14 | 2016-11-30 | 清华大学 | A kind of microwave signal measurement method based on fast laser scanning |
| CN104009812A (en) * | 2014-05-14 | 2014-08-27 | 清华大学 | Microwave signal measuring method based on rapid laser scanning |
| US10374764B2 (en) | 2014-06-13 | 2019-08-06 | Futurewei Technologies, Inc. | Aggregated touchless wireless fronthaul |
| CN104158552A (en) * | 2014-08-01 | 2014-11-19 | 华为技术有限公司 | Zero intermediate frequency transmitter, receiver and related method and system |
| CN104158552B (en) * | 2014-08-01 | 2016-11-23 | 华为技术有限公司 | Zero-intermediate-frequency transmitter, receiver and correlation technique and system |
| CN104811227A (en) * | 2015-04-09 | 2015-07-29 | 北京寰亚翔宇科技有限责任公司 | Navigational satellite signal long-distance transmission and distribution method based on optical transmission |
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| US9755779B2 (en) | 2015-04-17 | 2017-09-05 | Futurewei Technologies, Inc. | Digital representations of analog signals and control words using different multi-level modulation formats |
| CN107534487A (en) * | 2015-04-17 | 2018-01-02 | 华为技术有限公司 | The numerical method and device of Multilevel modulation formatted analog signal and control word |
| US10027413B2 (en) | 2015-06-18 | 2018-07-17 | Futurewei Technologies, Inc. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| US10205522B2 (en) | 2015-06-18 | 2019-02-12 | Futurewei Technologies, Inc. | Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul |
| CN105763261B (en) * | 2016-02-24 | 2018-08-07 | 烽火通信科技股份有限公司 | A kind of carrier communication method and system based on laser load-modulate |
| CN105763261A (en) * | 2016-02-24 | 2016-07-13 | 烽火通信科技股份有限公司 | Carrier communication method and carrier communication system based on laser loading modulation |
| WO2018040384A1 (en) * | 2016-08-31 | 2018-03-08 | 武汉光迅科技股份有限公司 | Optical multiplexing and demultiplexing module having automatic discovery function |
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| CN108519167A (en) * | 2018-04-16 | 2018-09-11 | 湖南工学院 | Wireless photon temperature-sensing system and method |
| CN109495179A (en) * | 2018-12-19 | 2019-03-19 | 中国电子科技集团公司第五十四研究所 | A kind of X-band wide-band high capacity communication device |
| CN111245466A (en) * | 2020-01-14 | 2020-06-05 | 上海理工大学 | Dual-antenna same-frequency signal processing module, multi-channel signal transmission device and application |
| CN111245466B (en) * | 2020-01-14 | 2022-01-25 | 上海理工大学 | Dual-antenna same-frequency signal processing module, multi-channel signal transmission device and application method |
| WO2021259354A1 (en) * | 2020-06-24 | 2021-12-30 | 中兴通讯股份有限公司 | Signal transmission method, system, network device and storage medium |
| WO2023103989A1 (en) * | 2021-12-08 | 2023-06-15 | 华为技术有限公司 | First device, second device, signal transmission method and wireless access system |
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