CN104467970A - Conversion device and method for transmitting signals in mixed mode - Google Patents
Conversion device and method for transmitting signals in mixed mode Download PDFInfo
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Abstract
The invention discloses a conversion device and method for transmitting signals in a mixed mode. The conversion device comprises an emission circuit and a receiving circuit, wherein the emission circuit and the receiving circuit are connected through an optical fiber link, the emission circuit comprises a power processor, a radio frequency receiving and emitting module and a combiner, the combiner conducts combining and multiplexing on the radio frequency signals sent by the power processor and the modulation signals sent by the radio frequency receiving and emitting module so as to obtain and send multiplexed signals, the receiving circuit comprises a first amplifier, a power divider, a first band-pass filter and a second band-pass filter, the received multiplexed signals are amplified through the first amplifier and are divided into two routes of signals through the power divider, and the radio frequency signals and the modulation signals are obtained through the two routes of signals by means of the first band-pass filter and the second band-pass filter. By means of the conversion device, the digital signals and the radio frequency signals can be transmitted at the same time and can also be transmitted independently, the mixed transmission of multiple routes of digital signals and multiple routes of radio frequency signals can be achieved by expanding the mixed transmission of one route of digital signal and one route of radio frequency signal.
Description
Technical field
The present invention relates to technical field of RFID, particularly the conversion equipment of signal mixed transport and method.
Background technology
In the long range propagation of high-frequency signal, analog optical link replaces high loss, inflexible coaxial cable gradually, becomes main selection.Due to the independence of the frequency of fibre loss, analog optical link can realize the transparency and the flexibility of microwave signal transmission.Analog optical link is the important component part of Microwave photonics, has merged microwave technology and photon technology.Utilizing the advantage of photon technology, as eliminated electromagnetic interference, high-isolation, low-loss etc., achieving area of light transmission and the process of microwave signal.Compared with traditional electronic system, its major advantage has low-loss, large bandwidth, lightweight, anticorrosive and electromagnetism interference etc.Analog optical link is the key component in a lot of space communication system, optical communication system.High-frequency microwave signal is converted to light signal by modulator, through Optical Fiber Transmission, becomes the signal of telecommunication at receiving terminal from photodetection.The main advantage of area of light transmission is mainly reflected in the low-loss of optical fiber, and the place's loss of 1550nm wavelength can be low to moderate 0.2dB/km, and the frequency independence of loss.If use coaxial cable at electrical domain signal transmission, loss will be very serious, and increase along with the increase of frequency.Although the loss of optical fiber is very low in analog optical link, electro-optic conversion (E/O) and opto-electronic conversion (O/E) all can introduce loss.In addition, these transfer processes also can along with the introducing of noise and nonlinear distortion.If be not optimized link, serious hydraulic performance decline will be there will be.Therefore, in order to ensure the availability of link, the design of analog optical link and the optimization of performance are vital.
Transmit two paths of signals, need to adopt multiplex technique, in existing communication system, the appearance of various multiplex technique is all expanding transmission capacity in varying degrees, improves efficiency of transmission.For optical fiber communication, its maximum advantage is to have larger bandwidth.In order to make full use of the band resource in optical fiber communication, effective method carries out time division multiplexing (Optical Time Division Multiplexing exactly in area of light, be called for short OTDM), wavelength division multiplexing (DenseWavelength Division Multiplexing, be called for short WDM) or frequency division multiplexing (FrequencyDivision Multiplexing is called for short FDM).But the mode of these recovery is not only expensive, and still has many technical barriers not also to be resolved.Therefore in present stage, practicable multiplex mode still will carry out in electrical domain.The time division multiplexing (Time Division Multiplexing is called for short TDM) of such as electrical domain, feasible at traditional digital communicating field, be the effective measures improving efficiency of transmission, reduce transmission cost.But, adopt TDM mode can be subject to two kinds of restrictions: one is the restriction by silicon and gallium arsenic technology, and silicon and gallium arsenic technology are close to the limit; Two is the restrictions of requirement by clock synchronous, and the raising namely along with transmission rate is more and more stricter to clock synchronization requirement, expect very accurate synchronous also can be more and more difficult, in addition, time division multiplexing also lacks necessary flexibility etc.Subcarrier multiplexing is normally using microwave as subcarrier, and modulator approach can be simulation, also can be digital.Subcarrier multiplexing system does not need complicated rate matching equipment, and the Timing Synchronization facility of complexity, and to the spectral purity of laser, the stability of frequency does not have special requirement yet, does not need frequency stabilization measure etc.Simultaneously subcarrier multiplexing receives only the signal in this carrier frequency band and ripple of making an uproar, and is conducive to limiting the equivalent bandwidth of ripple of making an uproar, improves the sensitivity of receiver.Be separate between each subcarrier in addition, various dissimilar service signal can be transmitted respectively, the mixing being easy to realize analog and digital signal and various different business comprehensive, be separated etc.
But, subcarrier multiplexing for be multichannel baseband signal, for process signal restricted.In addition, the device of more existing simultaneously transmission of digital signals and analog signals, all adopts frequency shift keying (Frequency Shift Keying is called for short FSK) that digital signal and analog signal are synthesized a road and transmits.Although can improve efficiency of transmission like this, digital signal and analog signal (as radiofrequency signal) must match transmission, lack flexibility.
Summary of the invention
Transmission must be matched in order to solve existing digital signal and radiofrequency signal, lacking the technical problem of flexibility, on the one hand,
The invention provides a kind of conversion equipment of signal mixed transport, comprising: radiating circuit and receiving circuit, connected by optical fiber link between described radiating circuit and described receiving circuit;
Described radiating circuit comprises power programmer, radio-frequency (RF) receiving and transmission module and mixer, and the radiofrequency signal that described mixer sends described power programmer and the modulation signal that described radio-frequency (RF) receiving and transmission module sends carry out that conjunction road is multiplexing to be obtained multiplexed signals and send;
Described receiving circuit comprises the first amplifier, power splitter, the first band pass filter and the second band pass filter, described first amplifier carries out amplification process to the multiplexed signals received and is amplified signal, described amplifying signal is divided into two paths of signals by described power splitter again, and described two paths of signals obtains described radiofrequency signal and described modulation signal respectively by described first band pass filter and described second band pass filter.
Optionally, the primary signal that described power programmer is used for signal source produces processes, and the described radiofrequency signal obtained is the radiofrequency signal with predetermined power.
Optionally, described radiating circuit also comprises controller, for carrying out sub-carrier modulation to the digital signal being input to described radio-frequency (RF) receiving and transmission module, obtains described modulation signal.
Optionally, in described receiving circuit, also comprise the second amplifier, amplify for the signal exported described second band pass filter, recover to obtain described radiofrequency signal.
Optionally, the modulation signal that described second band pass filter exports is processed by described radio-frequency (RF) receiving and transmission module, output digit signals.
On the other hand,
Present invention also offers a kind of conversion equipment of signal mixed transport, comprising: near-end circuit and remote circuitry, connected by optical fiber link between described near-end circuit and described remote circuitry;
Described near-end circuit comprises near-end down link and near-end up link;
Described near-end down link is for launching downstream signal, comprise the first power programmer, the first radio-frequency (RF) receiving and transmission module and the first mixer, the downlink radio-frequency signal that described first mixer sends described first power programmer and the downlink modulated signals that described first radio-frequency (RF) receiving and transmission module sends carry out that conjunction road is multiplexing to be obtained descending multiplexed signals and send;
Described near-end up link is for receiving upward signal, comprise the 3rd amplifier, the second power splitter, the 3rd band pass filter and the 4th band pass filter, described 3rd amplifier carries out amplification process to the up multiplexed signals received and obtains up amplifying signal, described up amplifying signal is divided into two paths of signals by described second power splitter again, and described two paths of signals obtains upstream radio-frequency signal and described up modulation signal respectively by described 3rd band pass filter and described 4th band pass filter;
Described remote circuitry comprises far-end down link and far-end up link;
Described far-end down link is for receiving described downstream signal, comprise the first amplifier, the first power splitter, the first band pass filter and the second band pass filter, described first amplifier carries out amplification process to the descending multiplexed signals received and obtains descending amplifying signal, described descending amplifying signal is divided into two paths of signals by described first power splitter again, and described two paths of signals obtains described downlink radio-frequency signal and described downlink modulated signals respectively by described first band pass filter and described second band pass filter;
Described far-end up link is for launching described upward signal, comprise the second power programmer, the second radio-frequency (RF) receiving and transmission module and the second mixer, the upstream radio-frequency signal that described second mixer sends described second power programmer and the up modulation signal that described second radio-frequency (RF) receiving and transmission module sends carry out that conjunction road is multiplexing to be obtained up multiplexed signals and send.
Optionally, described near-end up link also comprises the 4th amplifier, amplifies for the signal exported described 4th band pass filter, recovers to obtain described upstream radio-frequency signal;
Also comprise the second amplifier in described far-end down link, amplify for the signal exported described first band pass filter, recover to obtain described downlink radio-frequency signal.
Optionally, described near-end down link also comprises the first controller, for carrying out sub-carrier modulation to the downstream digital signal being input to described first radio-frequency (RF) receiving and transmission module, obtains described downlink modulated signals;
Described far-end up link also comprises second controller, for carrying out sub-carrier modulation to the digital uplink signal being input to described second radio-frequency (RF) receiving and transmission module, obtains described up modulation signal.
Optionally, the primary signal that described first power programmer is used for signal source produces processes, and the described downlink radio-frequency signal obtained is the radiofrequency signal with predetermined power;
Described second power programmer is used for processing the radiofrequency signal that described second amplifier returns, and obtains the upstream radio-frequency signal with predetermined power, and described upstream radio-frequency signal is exported to described second mixer.
Optionally, the downlink modulated signals that described second band pass filter exports is processed by described second radio-frequency (RF) receiving and transmission module, exports downstream digital signal, and is exported by serial ports;
The up modulation signal that described 3rd band pass filter exports is processed by described first radio-frequency (RF) receiving and transmission module, exports digital uplink signal, and is exported by serial ports.
On the other hand,
Present invention also offers a kind of conversion method of signal mixed transport, comprising:
It is multiplexing that transmit leg carries out conjunction road to the radiofrequency signal of input and modulation signal, obtains multiplexed signals and send;
Recipient carries out amplification process to described multiplexed signals and is amplified signal;
After described amplifying signal is divided into two paths of signals by recipient, respectively by the filtering process of different center frequency, obtain described radiofrequency signal and described modulation signal.
Optionally, described radiofrequency signal is the radiofrequency signal with predetermined power, and described modulation signal is that digital signal obtains through sub-carrier modulation.
The conversion equipment of signal mixed transport provided by the invention, can simultaneously transmission of digital signals and radiofrequency signal, and solving in prior art also can the technical problem of a transmission of digital signals or radiofrequency signal.This device can also expand to the mixed transport of multiply digital signals and multi-channel rf signal easily from the mixed transport of a railway digital signal and radiofrequency signal.
Accompanying drawing explanation
The composition schematic diagram of the conversion equipment of a kind of signal mixed transport that Fig. 1 provides for embodiment one;
Fig. 2 is the structural representation be applied in by the conversion equipment in embodiment one in unidirectional transmission link;
The composition schematic diagram of the conversion equipment of a kind of signal mixed transport that Fig. 3 provides for embodiment three;
Fig. 4 is the structural representation be applied in by the conversion equipment in embodiment three in unidirectional transmission link;
Fig. 5 is that the conversion equipment in embodiment one to four is applied in transmission and processing process schematic diagram in passive RFID fiber optic transmission system;
Fig. 6 is conversion equipment distributing position schematic diagram in whole passive RFID fiber optic transmission system;
The flow chart of steps of the conversion method of a kind of signal mixed transport that Fig. 7 provides for embodiment five;
Fig. 8 is the transmission and processing process schematic diagram of passive RFID fiber optic transmission system in embodiment six;
Fig. 9 is conversion equipment distributing position schematic diagram in whole passive RFID fiber optic transmission system of digital signal and radiofrequency signal mixed transport in embodiment six.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
Present embodiments provide a kind of conversion equipment of signal mixed transport, composition schematic diagram as shown in Figure 1, comprising: near-end circuit 100 and remote circuitry 200, connects 300 between radiating circuit 100 and receiving circuit 200 by optical fiber link.
The composition schematic diagram of radiating circuit 100 as shown in Figure 2, comprise power programmer 101, radio-frequency (RF) receiving and transmission module 102 and mixer 103, the radiofrequency signal that the mixer 103 pairs of power programmers 101 send and the modulation signal that radio-frequency (RF) receiving and transmission module 102 sends carry out that conjunction road is multiplexing to be obtained multiplexed signals and send.
The composition schematic diagram of receiving circuit 200 as shown in Figure 3, comprise the first amplifier 201, power splitter 202, first band pass filter 203 and the second band pass filter 204, first amplifier 201 carries out amplification process to the multiplexed signals received and is amplified signal, amplifying signal is divided into two paths of signals by power splitter 202 again, and two paths of signals obtains radiofrequency signal and modulation signal respectively by the first band pass filter 203 and the second band pass filter 204.The modulation signal that second band pass filter 204 exports again is input in radio-frequency (RF) receiving and transmission module 102 ' and also will processes under the control of controller 104 ', and by serial ports output digit signals.
Optionally, power programmer 101 processes for the primary signal produced signal source (not shown in figure 1), and the radiofrequency signal obtained is the radiofrequency signal with predetermined power.
Optionally, radiating circuit 100 also comprises controller 104, for carrying out sub-carrier modulation to the digital signal being input to radio-frequency (RF) receiving and transmission module 102, obtain modulation signal, its middle controller is preferably single-chip microcomputer, communicated with the external world by serial ports, digital signal is input to radio-frequency (RF) receiving and transmission module 102 by serial ports.Wherein radio-frequency (RF) receiving and transmission module is preferably the rf chips such as conventional nRF401, RF2915, BC418, CC400, and radio-frequency (RF) receiving and transmission module is made up of these rf chips and some peripheral components.
Optionally, in receiving circuit 200, also comprise the second amplifier 205, amplify for the signal exported the second band pass filter 204, recover to obtain radiofrequency signal.Because the receiving sensitivity of radio-frequency (RF) receiving and transmission module is very high, the signal that therefore the second band pass filter 204 exports need not, again through amplifying process, not need to use amplifier before entering radio-frequency (RF) receiving and transmission module.
Optionally, the modulation signal that the second band pass filter 204 exports also needs to be processed by radio-frequency (RF) receiving and transmission module after exporting, and by serial ports output digit signals.
Also it should be noted that, between reflection electric circuit 100 and optical fiber link 300, also comprise electrooptic conversion module 400, between receiving circuit 200 and optical fiber link 300, also comprise photoelectric conversion module 500.
The conversion equipment of what the present embodiment provided be adapted to digital signal and radiofrequency signal mixed transport, compare more flexible with analog signal compound transmission device with traditional digital signal, extensibility is stronger.This conversion equipment can simultaneously transmission of digital signals and analog signal, also can a transmission of digital signals or analog signal.In addition, this conversion equipment can expand to the mixed transport of multiply digital signals and multichannel analog signals easily from the mixed transport of a railway digital signal and radiofrequency signal.The digital signal that radiating portion serial ports produces enters carries out sub-carrier modulation by monolithic processor controlled radio-frequency (RF) receiving and transmission module, converts the modulation signal of assigned frequency and power to.The radiofrequency signal of certain power is obtained after the radiofrequency signal ingoing power processor that signal source produces.Radiofrequency signal after modulation signal and process is multiplexing by mixer, then enters electrooptic conversion module and convert light signal to.Receiving unit receives light signal, convert to after the signal of telecommunication through photoelectric conversion module, certain power is amplified to through the signal of telecommunication first amplifier, two paths of signals is divided into again by power splitter, this two paths of signals, respectively by the band pass filter of corresponding centre frequency, obtains independent radiofrequency signal and modulation signal.Radiofrequency signal is amplified to required power through the 3rd amplifier, modulation signal through the second amplifier laggard enter radio-frequency (RF) receiving and transmission module process, revert to digital signal.
Embodiment two
According to different application scenarioss, the conversion equipment in embodiment one can be applied in system link flexibly, the conversion equipment in embodiment one is applied in the structural representation of unidirectional transmission link as shown in Figure 2 by the present embodiment.
In unidirectional transmission link, the radiating circuit of conversion equipment and receiving circuit lay respectively at near-end and the far-end of link.In fiber optic transmission system, the radiofrequency signal being input to system enters before laser modulates, and first radiofrequency signal is controlled in suitable power bracket through power programmer.The digital signal inputted by serial ports after treatment, generates the modulation signal of certain power and frequency in radio-frequency (RF) receiving and transmission module.It is multiplexing that two paths of signals (radiofrequency signal and modulation signal) enters mixer, synthesizes a road signal, modulate laser.The multiplexed signals that mixer exports is changed (i.e. E/O) by electrooptic conversion module and is transmitted by optical fiber into after light signal.
Light signal, by after Optical Fiber Transmission, detects light signal at receiving unit by detector, and by photoelectric conversion module conversion (i.e. O/E), light signal is reduced into the signal of telecommunication.Certain loss is had in transmission signal process, after the first amplifier (i.e. amplifier 1) process, power splitter is entered at receiving unit, the two paths of signals separated by power splitter carries out filtering respectively by band pass filter, after amplifier process, recover transmitted radiofrequency signal and digital signal.Wherein a road signal exports the radiofrequency signal of replying through the first band pass filter (BPF1) and the second amplifier (amplifier 2), the modulation signal that another road signal exports after the second band pass filter (BPF2) needs to recover digital signal in the radio-frequency (RF) receiving and transmission module under Single-chip Controlling, and is exported by serial ports.
Embodiment three
The present embodiment additionally provides a kind of conversion equipment of signal mixed transport, and composition schematic diagram as shown in Figure 5, comprising: near-end circuit 100 and remote circuitry 200, connected by optical fiber link 300 between near-end circuit 100 and remote circuitry 200;
Near-end circuit 100 comprises near-end down link and near-end up link.
Near-end down link is for launching downstream signal, comprise downlink radio-frequency signal that the first power programmer 111, first radio-frequency (RF) receiving and transmission module 112 and the first mixer 113, first mixer 113 send the first power programmer 111 and the downlink modulated signals that the first radio-frequency (RF) receiving and transmission module 112 sends and carry out that conjunction road is multiplexing to be obtained descending multiplexed signals and send.
Near-end up link is for receiving upward signal, comprise the 3rd amplifier 121, second power splitter 111, the 3rd band pass filter 123 and the 4th band pass filter 124,3rd amplifier 121 carries out amplification process to the up multiplexed signals received and obtains up amplifying signal, up amplifying signal is divided into two paths of signals by the second power splitter 122 again, and two paths of signals obtains upstream radio-frequency signal and up modulation signal respectively by the 3rd band pass filter 123 and the 4th band pass filter 124.
Remote circuitry 200 comprises far-end down link and far-end up link.
Far-end down link is for receiving downstream signal, comprise the first amplifier 211, first power splitter 212, first band pass filter 213 and the second band pass filter 214, first amplifier 211 carries out amplification process to the descending multiplexed signals received and obtains descending amplifying signal, descending amplifying signal is divided into two paths of signals by the first power splitter 212 again, and two paths of signals obtains downlink radio-frequency signal and downlink modulated signals respectively by the first band pass filter 213 and the second band pass filter 214.
Far-end up link is used for transmit uplink signal, comprise upstream radio-frequency signal that the second power programmer 221, second radio-frequency (RF) receiving and transmission module 222 and the second mixer 223, second mixer 223 send the second power programmer 221 and the up modulation signal that the second radio-frequency (RF) receiving and transmission module 222 sends and carry out that conjunction road is multiplexing to be obtained up multiplexed signals and send.
Optionally, near-end up link also comprises the 4th amplifier 125, amplifies for the signal exported the 4th band pass filter 124, recovers to obtain upstream radio-frequency signal.
Also comprise the second amplifier 215 in far-end down link, amplify for the signal exported the first band pass filter 213, recover to obtain downlink radio-frequency signal.
Optionally, near-end down link also comprises the first controller 114, for carrying out sub-carrier modulation to the digital signal being input to the first radio-frequency (RF) receiving and transmission module 112 by serial ports, obtains downlink modulated signals.
Far-end up link also comprises second controller 224, for carrying out sub-carrier modulation to the digital signal being input to the first radio-frequency (RF) receiving and transmission module 222 by serial ports, obtains up modulation signal.The first controller 114 wherein and second controller 224 are all preferably single-chip microcomputer, respectively to the digital signal be input in radio-frequency (RF) receiving and transmission module processes by serial ports, obtain modulation signal (up modulation signal or downlink modulated signals).
Optionally, the first power programmer 111 processes for the primary signal produced signal source (not shown in Fig. 3), and the downlink radio-frequency signal obtained is the radiofrequency signal with predetermined power;
Second power programmer 221 processes for the radiofrequency signal returned the second amplifier 215, obtains the upstream radio-frequency signal with predetermined power, and upstream radio-frequency signal is exported to the second mixer 223.
Optionally, the downlink modulated signals that the second band pass filter 214 exports is processed by the second radio-frequency (RF) receiving and transmission module 222, exports downstream digital signal, and is exported by serial ports;
The up modulation signal that 3rd band pass filter 123 exports is processed by the first radio-frequency (RF) receiving and transmission module 112, exports digital uplink signal, and is exported by serial ports.
Also it should be noted that, connected by optical fiber link 300 between remote circuitry 100 and near-end circuit 200, and also comprise electrooptic conversion module 400 between near-end circuit 100 and optical fiber link 300, also comprise photoelectric conversion module 500 between remote circuitry 200 and optical fiber link 300.
The conversion equipment of the signal mixed transport that the present embodiment provides, can simultaneously transmission of digital signals and radiofrequency signal (analog signal), and solving in prior art also can the technical problem of a transmission of digital signals or analog signal.This device can also expand to the mixed transport of multiply digital signals and multichannel analog signals easily from the mixed transport of a railway digital signal and radiofrequency signal.
Embodiment four
According to different application scenarioss, the conversion equipment in embodiment three can be applied in system link flexibly, the conversion equipment in embodiment three is applied in the structural representation of bi-directional transmission link as shown in Figure 6 by the present embodiment.
In bi-directional transmission link, conversion equipment comprises the two parts being positioned at link near-end and far-end.At near-end, the radiating portion of conversion equipment is arranged in down link, and receiving unit is arranged in up link; At far-end, the radiating portion of conversion equipment is arranged in up link, and receiving unit is arranged in down link.
Down link, has certain Power Limitation owing to entering laser, and the radiofrequency signal that near-end is launched first will obtain radiofrequency signal through Power Processing, and digital signal enters the analog signal that radio-frequency (RF) receiving and transmission module converts certain power and frequency to, i.e. modulation signal.Two paths of signals converts light signal to through electrooptic conversion module (E/O) after synthesizing a road signal by mixer, passes to far-end by optical fiber link, and E/O can be laser.
Owing to having certain power loss in transmitting procedure, far-end first will process through the first amplifier (amplifier 3) through photoelectric conversion module (O/E) after receiving light signal, then enters power splitter.The two paths of signals that power splitter separates, a road signal enters the first band pass filter (BPF3) and carries out filtering, recovers radiofrequency signal through the second amplifier (amplifier 4); Another road signal then enters after the second band pass filter (BPF4) carries out filtering and reverts to digital signal through radio-frequency (RF) receiving and transmission module.
Up link is identical with the processing procedure of up link, in the uplink, the power programmer of far-end processes the radiofrequency signal obtaining having certain power to the radiofrequency signal returned, the digital signal inputted by serial ports is entered radio-frequency (RF) receiving and transmission module and converts the analog signal of certain power and frequency to, i.e. modulation signal.Two paths of signals converts light signal to through electrooptic conversion module (E/O) after synthesizing a road signal by mixer, passes to far-end, in Fig. 6 by optical fiber link.
Owing to having certain power loss in transmitting procedure, far-end first will process through the 3rd amplifier (amplifier 5) after receiving signal, then enters power splitter.The two paths of signals that power splitter separates, a road signal enters the 3rd band pass filter (BPF5) and carries out filtering, recovers radiofrequency signal through the 4th amplifier (amplifier 6); Another road signal then enters after the 4th band pass filter (BPF6) carries out filtering and reverts to digital signal through radio-frequency (RF) receiving and transmission module.
Embodiment five
Based on the conversion equipment that above-described embodiment one to four provides, additionally provide a kind of conversion method of signal mixed transport in the present embodiment, flow chart of steps as shown in Figure 7, comprises the following steps:
It is multiplexing that step S1, transmit leg carry out conjunction road to the radiofrequency signal of input and modulation signal, obtains multiplexed signals and send.
Step S2, recipient carry out amplification process to multiplexed signals and are amplified signal.
After amplifying signal is divided into two paths of signals by step S3, recipient, respectively by the filtering process of different center frequency, obtain radiofrequency signal and modulation signal.
Wherein radiofrequency signal is the radiofrequency signal with predetermined power, and the radiofrequency signal that the primary signal namely produced signal source obtains after power programmer processes is exactly the signal with predetermined power.Modulation signal is the signal that obtains through sub-carrier modulation of digital signal of input, and is carrying out sub-carrier modulation process and also need the control of controller (can be single-chip microcomputer).
In addition, the two paths of signals that amplifying signal exports needs to carry out filtering process by the band pass filter of two different center frequency, respectively output digit signals and radiofrequency signal.Wherein digital signal is exported by serial ports, and radiofrequency signal also needs could export through the amplification process of amplifier.
It should be noted that, conversion equipment in the present embodiment one to four is all send signal and Received signal strength two-way is example, in fact in the present invention the object of conversion is limited in transmitting-receiving two side, can also be in many ways, namely can also be a transmit leg in other embodiments, multiple recipient, or a recipient, multiple transmit leg, and multiple transmit leg and multiple recipient.
The conversion method that the present embodiment provides describes to the transmission of signal and conversion process between transmit leg and recipient, and no matter transmit leg and recipient be one or be multiplely all suitable for the method.
Embodiment six
Conversion equipment in above-described embodiment one to four can be applied in passive RFID fiber optic transmission system by the present embodiment, and concrete transmission and processing process as shown in Figure 8.Master control borad control read write line tranmitting frequency is 920Mhz-925Mhz, power is 30dB radiofrequency signal, and power controls in certain power bracket through power programmer 1 by radiofrequency signal.In addition, master control borad is connected with radio-frequency (RF) receiving and transmission module by serial ports, and link information is converted to the analog signal that lower-wattage frequency is f0 by Single-chip Controlling radio-frequency (RF) receiving and transmission module.The radiofrequency signal of 920Mhz-925Mhz and the analog signal of f0, by mixer 1, obtain a road mixed signal, and at this moment the loss of every road signal is all at about 3-4dB.Mixed signal becomes light signal through laser modulation, is transmitted by optical fiber.
Can be lossy in Optical Fiber Transmission process, mixed signal also can make power impaired after power splitter.Therefore will first through amplifier 1 before signal enters power splitter, after signal is amplified to certain power, two paths of signals is divided into again by power splitter 1, one road signal enters BPF1, recover the radiofrequency signal of 920Mhz-925Mhz, after amplifier 2 amplifies, return to 30dB radio-frequency power, by antenna, radiofrequency signal is sent.Another road signal enters BPF2, obtains the radiofrequency signal of f0, through amplifier 3 laggard enter after radio frequency chip processes, by Serial Port Transmission to administration module.In the uplink, administration module returns the digital signal come, and enters rf chip, convert the analog signal of f0 to through serial ports.The radiofrequency signal that antenna receives, first obtained the signal of certain power before entering mixer 2 through power programmer 2.Two paths of signals synthesizes a road signal after entering mixer 2, convert light signal to again, certain power loss can be produced after optical fiber link transmission, power splitter 2 is entered after amplifier 4 processes, one road signal through BPF3, then Modulating Power laggard enter rf chip convert digital signal to and pass master control borad back.Another road signal, by after BPF4, reverts to radiofrequency signal, passes read write line back.
Distributing position schematic diagram is as shown in Figure 9 in whole passive RFID fiber optic transmission system for the conversion equipment of digital signal and radiofrequency signal mixed transport.In this transmission system, PC is the control centre of whole system, and a PC can control multiple router and be connected with master control borad, and each router controls multiple master control borad.Master control borad is responsible for distally administration module transmission acquisition on the one hand orders and receives the state information obtaining far-end optical module, controls read write line transmission radiofrequency signal on the one hand and the information of reading tag.At near-end, this device is responsible for radiofrequency signal that the reading control command that sent by master control borad and radio-frequency (RF) switch send on the one hand and is converted a road radiofrequency signal to and pass to far-end by optical fiber, be responsible on the other hand the data-signal sent back by far-end and radiofrequency signal is separated, data message passes master control borad back, and radiofrequency signal passes read write line back.At far-end, this device is responsible for the signal received to process, and reverts to two paths of signals.One road signal is the radiofrequency signal that read write line sends, and is launched by signal by antenna; Another road signal is reading order information, will be sent to network management module, and the state information of optical module then returns by administration module, and the radiofrequency signal that the signal of passback and the tag reflection received return is synthesized a road signal and passed near-end back.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (12)
1. a conversion equipment for signal mixed transport, is characterized in that, comprising: radiating circuit and receiving circuit, is connected between described radiating circuit and described receiving circuit by optical fiber link;
Described radiating circuit comprises power programmer, radio-frequency (RF) receiving and transmission module and mixer, and the radiofrequency signal that described mixer sends described power programmer and the modulation signal that described radio-frequency (RF) receiving and transmission module sends carry out that conjunction road is multiplexing to be obtained multiplexed signals and send;
Described receiving circuit comprises the first amplifier, power splitter, the first band pass filter and the second band pass filter, described first amplifier carries out amplification process to the multiplexed signals received and is amplified signal, described amplifying signal is divided into two paths of signals by described power splitter again, and described two paths of signals obtains described radiofrequency signal and described modulation signal respectively by described first band pass filter and described second band pass filter.
2. conversion equipment according to claim 1, is characterized in that, the primary signal that described power programmer is used for signal source produces processes, and the described radiofrequency signal obtained is the radiofrequency signal with predetermined power.
3. conversion equipment according to claim 1, is characterized in that, described radiating circuit also comprises controller, for carrying out sub-carrier modulation to the digital signal being input to described radio-frequency (RF) receiving and transmission module, obtains described modulation signal.
4. conversion equipment according to claim 1, is characterized in that, also comprises the second amplifier in described receiving circuit, amplifies for the signal exported described second band pass filter, recovers to obtain described radiofrequency signal.
5. conversion equipment according to claim 4, is characterized in that, the modulation signal that described second band pass filter exports is processed by described radio-frequency (RF) receiving and transmission module, output digit signals.
6. a conversion equipment for signal mixed transport, is characterized in that, comprising: near-end circuit and remote circuitry, is connected between described near-end circuit and described remote circuitry by optical fiber link;
Described near-end circuit comprises near-end down link and near-end up link;
Described near-end down link is for launching downstream signal, comprise the first power programmer, the first radio-frequency (RF) receiving and transmission module and the first mixer, the downlink radio-frequency signal that described first mixer sends described first power programmer and the downlink modulated signals that described first radio-frequency (RF) receiving and transmission module sends carry out that conjunction road is multiplexing to be obtained descending multiplexed signals and send;
Described near-end up link is for receiving upward signal, comprise the 3rd amplifier, the second power splitter, the 3rd band pass filter and the 4th band pass filter, described 3rd amplifier carries out amplification process to the up multiplexed signals received and obtains up amplifying signal, described up amplifying signal is divided into two paths of signals by described second power splitter again, and described two paths of signals obtains upstream radio-frequency signal and described up modulation signal respectively by described 3rd band pass filter and described 4th band pass filter;
Described remote circuitry comprises far-end down link and far-end up link;
Described far-end down link is for receiving described downstream signal, comprise the first amplifier, the first power splitter, the first band pass filter and the second band pass filter, described first amplifier carries out amplification process to the descending multiplexed signals received and obtains descending amplifying signal, described descending amplifying signal is divided into two paths of signals by described first power splitter again, and described two paths of signals obtains described downlink radio-frequency signal and described downlink modulated signals respectively by described first band pass filter and described second band pass filter;
Described far-end up link is for launching described upward signal, comprise the second power programmer, the second radio-frequency (RF) receiving and transmission module and the second mixer, the upstream radio-frequency signal that described second mixer sends described second power programmer and the up modulation signal that described second radio-frequency (RF) receiving and transmission module sends carry out that conjunction road is multiplexing to be obtained up multiplexed signals and send.
7. conversion equipment according to claim 6, is characterized in that, described near-end up link also comprises the 4th amplifier, amplifies for the signal exported described 4th band pass filter, recovers to obtain described upstream radio-frequency signal;
Also comprise the second amplifier in described far-end down link, amplify for the signal exported described first band pass filter, recover to obtain described downlink radio-frequency signal.
8. conversion equipment according to claim 7, is characterized in that, described near-end down link also comprises the first controller, for carrying out sub-carrier modulation to the downstream digital signal being input to described first radio-frequency (RF) receiving and transmission module, obtains described downlink modulated signals;
Described far-end up link also comprises second controller, for carrying out sub-carrier modulation to the digital uplink signal being input to described second radio-frequency (RF) receiving and transmission module, obtains described up modulation signal.
9. conversion equipment according to claim 7, is characterized in that, the primary signal that described first power programmer is used for signal source produces processes, and the described downlink radio-frequency signal obtained is the radiofrequency signal with predetermined power;
Described second power programmer is used for processing the radiofrequency signal that described second amplifier returns, and obtains the upstream radio-frequency signal with predetermined power, and described upstream radio-frequency signal is exported to described second mixer.
10. conversion equipment according to claim 7, is characterized in that, the downlink modulated signals that described second band pass filter exports is processed by described second radio-frequency (RF) receiving and transmission module, exports downstream digital signal, and is exported by serial ports;
The up modulation signal that described 3rd band pass filter exports is processed by described first radio-frequency (RF) receiving and transmission module, exports digital uplink signal, and is exported by serial ports.
The conversion method of 11. 1 kinds of signal mixed transport, is characterized in that, comprising:
It is multiplexing that transmit leg carries out conjunction road to the radiofrequency signal of input and modulation signal, obtains multiplexed signals and send;
Recipient carries out amplification process to described multiplexed signals and is amplified signal;
After described amplifying signal is divided into two paths of signals by recipient, respectively by the filtering process of different center frequency, obtain described radiofrequency signal and described modulation signal.
12. conversion methods according to claim 11, is characterized in that, described radiofrequency signal is the radiofrequency signal with predetermined power, and described modulation signal is that digital signal obtains through sub-carrier modulation.
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| CN201410707436.4A CN104467970A (en) | 2014-11-28 | 2014-11-28 | Conversion device and method for transmitting signals in mixed mode |
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