CN102075471A - Gaussian filter minimum shift frequency keying-based optical wireless fusion system and method - Google Patents
Gaussian filter minimum shift frequency keying-based optical wireless fusion system and method Download PDFInfo
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Abstract
The invention provides a Gaussian filter minimum shift frequency keying-based optical wireless fusion system and a Gaussian filter minimum shift frequency keying-based optical wireless fusion method. In the system, a signal device comprises N signal source modules, wherein each signal source module generates two analog electrical signals; a link device performs optical modulation on received analog electrical signals through an optical link, and transmits N modulated independent optical signals and an unmodulated optical signal; and a receiving device processes the received N modulated independent optical signals and the unmodulated optical signal to acquire information-carrying data so as to realize optical wireless fusion transmission. The method and the system can reduce system cost, improve system performance, and effectively provide multi-user services.
Description
Technical field
The present invention relates to the communication technology, particularly a kind of system and method for the wireless fusion of light of the high communication quality based on Gaussian Minimum Shift-frequency Keying (GMSK)
Background technology
The global tide of IT application in recent years makes people improve rapidly the requirement of capability of communication system and quality, and broadband wireless access is becoming the main developing direction of future communications.Though with the optical fiber access is that wired access of representative can provide very big bandwidth, the mobility of terminal is restricted.Wireless mobile communications is because the flexibility and the ambulant advantage of its access more are subjected to user's favor, but present low frequency wireless communication system bandwidth is narrower, can't satisfy broadband business demands such as following mobile multimedia, Streaming Media.Nowadays, a kind of wireless fusion of the novel communication technology-light (ROF) of merging optical fiber communication and wireless mobile telecommunication technology advantage is suggested.Fully in conjunction with the characteristics of optical fiber and high frequency radio wave transmission, it has following advantage for it:
1: power loss reduces, system cost reduces.In the ROF system, adopt optical fiber to transmit millimeter-wave signal, because optical fiber has low-loss characteristic as transmission medium, signal is under the less situation of delivering power, can in optical fiber, transmit larger distance, greatly reduce the power loss of system, reduce the cost of system.
2: system bandwidth improves.ROF utilizes optical fiber to come transmission signals,, optical fiber has huge loan resource, these three low loss window of 850nm, 1310nm and 1550nm, total can provide the bandwidth resources of 50THz, has improved the bandwidth of system greatly.
3: be not subjected to electromagnetic interference.The ROF technology is carried in millimeter-wave signal on the light wave and in optical fiber to be transmitted, and can not be subjected to the interference of external electromagnetic ripple, also can not produce electromagnetic interference to external world simultaneously.
4: the very big application of multioperation, multiservice communication.The ROF technology can satisfy the flexibility of system level operation, can realize the transparence of signal format, low-loss single-mode optical fiber and radio-frequency carrier modulation technique can be combined and be designed to a transparent linear system, make the ROF system can be used for supporting distribution multioperation, multiservice communication business.
Along with development of Communication Technique, modulation system is divided into two kinds of analog-modulated and digital modulation haply by the form of modulation signal.Analog-modulated roughly has phase modulated (PM), frequency modulation(FM) (FM), amplitude modulation(PAM) (AM) etc.; Digital modulation roughly has phase deviation modulation (PSK), frequency shift (FS) modulation (FSK), amplitude offset modulation (ASK) etc.A kind of minimum shift keying (GMSK) from the next digital modulation mode-gaussian filtering of minimum shift keying (MSK) development is the modulation system that global system for mobile communications (GSM) adopts, be the research focus in current modern digital modulation technique field, obtained to use widely.It has constant envelope, and envelope rises and falls very little; With respect to MSK, its power spectrum side lobe attenuation is faster; It can effectively support many services, multi-user's application.
The ROF technology based on GMSK with so many advantage has broad application prospects at vehicle-mounted mobile communication, hot zones and aspects such as indoor covering, radar signal transmission, for example insert in (FWA) system and special-purpose Small Extension Node. Communications (DSRC) system at broadband fixed wireless, can improve the bandwidth of communication system greatly, the transmission rate of raising system can effectively solve the frequency spectrum resource problem in short supply of low-frequency range.Yet, in utilizing the ROF system of monomode fiber, because being modulated on the light wave, radiofrequency signal can produce a plurality of light wave compositions that frequency interval equals radio frequency signal frequency, increase along with the frequency of radiofrequency signal, the length of optical fiber dispersion limit fibre link, cause the correlation of signal phase to reduce simultaneously, and then increase the phase noise of radio-frequency carrier, restriction link bandwidth and transmission range.So we will study under the radiofrequency signal situation than low frequency, realize system and method based on the ROF of GMSK.
Fig. 1 is the structural representation of existing ROF system based on quaternary PSK (QPSK), and is existing in conjunction with Fig. 1, and the structure of existing ROF system based on QPSK is described, specific as follows:
Existing ROF system based on QPSK comprises: signal source module 10 and optical link module 11.
Above-mentioned is the wireless emerging system of light of existing minimum shift keying based on gaussian filtering, this system can tentatively realize the signal transmission that optical communication and radio communication merge, but owing to adopted the QPSK modulation format, can not effectively resist the influence of non-linear and Doppler's translation etc. of the channel that signal is subjected in transmission course, can not support whole system to many services, multi-user's direction develops, make through the error rate after the radiofrequency signal reception of ROF transmission transmission higher, influenced the systematic function of ROF to a great extent, also limited the ROF system in many services, multi-user's application has influenced the development of ROF system to a great extent.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of wireless emerging system of light based on Gaussian Minimum Shift-frequency Keying (GMSK), this system can reduce system cost, improves the ROF systematic function, provides the multi-user to serve.
Another object of the present invention is to provide a kind of wireless fusion method of light based on Gaussian Minimum Shift-frequency Keying (GMSK), this method can reduce system cost, improves the ROF systematic function, provides the multi-user to serve.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of wireless fusion of light (ROF) system based on Gaussian Minimum Shift-frequency Keying (GMSK), this system comprises: signalling, chain circuit device and receiving system:
Described signalling comprises N signal source module, is used to produce 2N road analog electrical signal to chain circuit device; Each signal source module in the described N signal source module utilizes address logic to produce the two-way digital electric signal, and utilize digital-to-analogue conversion to be translated into the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal respectively, the output analog electrical signal is to chain circuit device; Described address logic is the pairing sine in address, the cosine function value table that is generated by system logic; Described digital-to-analogue conversion is that digital signal is converted to analog signal; Described N is the positive integer more than or equal to 1;
Described chain circuit device utilizes independently light signal of wide range light signal generating N+1 road, the light signal on the N road of wherein modulating is modulated by external modulation technology and the analog electrical signal that receives, and the light signal of output N road GMSK modulation and one road unmodulated light signal are to receiving system; Described external modulation technology refers to not to be signal directly to be loaded on the laser modulate, but realizes the light modulation techniques of signal modulation on the modulator externally; The sequence number of the light signal on described N road of modulating is i; The sequence number of described unmodulated light signal is 0; Described i is more than or equal to 1 and smaller or equal to the positive integer of N;
Described receiving system is used for the N+1 road light signal to receiving, and i road light signal and the 0 road light signal utilize opto-electronic conversion, obtains one the tunnel and is fit to the analog electrical signal that transmitting terminal is launched, and analog electrical signal is received and handles the data that obtain to comprise information; Described opto-electronic conversion promptly utilizes photoelectric effect that light signal is converted to corresponding electric signal; Described transmitting terminal is for being fit to send the antenna of signal;
In said apparatus, each signal source module in the described signalling comprises:
Pulse train is carried out shaping by offset of sinusoidal ripple signal, and sinusoidal signal is shaped as the pulse sequence signal that system needs, and exports the address logic module to;
Address logic, the pulse train that is used for receiving is converted to corresponding sine, cosine function value, by being solidificated in the random data table in the internal memory, take out corresponding signal discrete value according to the address, pulse sequence signal is converted to sine, cosine waveform digital electric signal, respectively output independently the 2i-1 way word signal of telecommunication and the 2i way word signal of telecommunication to its digital to analog converter;
Digital-to-analogue conversion, be used for is the 2i-1 way word signal of telecommunication that receives and 2i way word electrical signal conversion the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal respectively, pass through analog operational circuit, digital electric signal is converted to corresponding analog electrical signal, exports 2i-1 road analog electrical signal and 2i road analog electrical signal to chain circuit device;
In said apparatus, described chain circuit device comprises:
Wide spectrum light source is used to produce the light signal that is adapted at transmitting on the optical fiber, as the light signal in the link, exports suitable light signal to comb filter;
Comb filter, be used for the light signal that contains a plurality of frequencies that will receive,, only allow the signal of some characteristic frequency pass through by press the passband and the stopband of certain frequency interval aligned identical, select the light signal of the frequency that needs, the individual independently light signal of the N+1 that output is selected is to channel-splitting filter;
Channel-splitting filter is used for the N+1 that receives that independently light signal is separated from one another comes, and enters different light paths respectively and transmits, and exports i road light signal to splitter i, exports the 0 road light signal to multiplexer;
Splitter i is used for 2i-1 and 2i road light signal that an i road light signal that receives is divided into the same nature of two-way parallel transmission, exports 2i-1 road light signal to the pi/2 phase shift module, exports 2i road light signal to signal modulator 2i;
The pi/2 phase shift module, be used for the phase place of the 2i-1 road light signal that receives is carried out the variation of pi/2, guaranteed that the pi/2 phase between 2i-1 road light signal and the 2i road light signal is poor, guaranteed the orthogonality relation between the two paths of signals, the light signal after the output phase shift is to signal modulator 2i-1;
Signal modulator, be used for the 2N road analog electrical signal that receives is modulated to light signal, 2N road light signal entering signal modulator, and the signal of telecommunication control end of the 2N road analog electrical signal entering signal modulator that provides by signalling, voltage by the signal modulator offset side constantly changes, realize the modulation of analog signal, and export modulated 2N road light signal to summation module to light signal;
Summation module is used for the 2i-1 road light signal and the 2i road light signal that receive are combined into the light signal that transmits on the optical link, and the light signal of output N road independence GMSK modulation is to multiplexer;
Multiplexer, be used for receive modulated N road independently the same direction that is bonded on one road route of light signal and unmodulated one road optical multiplexed signal transmit, export signal after compound to image intensifer;
Image intensifer is used for the light signal that receives is carried out the as far as possible little amplification of distortion, has avoided like this obscuring in noise too greatly in signal long-distance transmission back decay, causes and can't accurately the signal demodulation be come out, and exports optical fiber to;
Optical fiber is used for providing to light signal the path of long Distance Transmission as transmission medium, exports receiving system to;
In said apparatus, described receiving system comprises:
Demodulation multiplexer is cut apart the road light signal that contains N+1 centre frequency that receives, and obtains independently light signal of N+1 road, exports the 0 road light signal to band pass filter 0, exports i road light signal to band pass filter i;
Optical band pass filter is used for the light signal that receives is carried out bandpass filtering, and optical band pass filter 0 exports splitter 0 to, and optical band pass filter i exports summation module i to; Described light belt pass filter promptly only passes through centre frequency, filtering low-and high-frequency light signal;
Splitter 0 is used for the N road light signal that the 0 road light signal that receives is divided into the same nature of parallel transmission, exports N summation module respectively to;
Summation module i is used for the i road light signal and the 0 road light signal that receive are combined into the light signal that transmits on the optical link, and the output light signal is to photoelectric detector i;
Photoelectric detector i is used for i road light signal that receives and the synthetic light signal of the 0 road light signal are converted to associated analog electrical signal by photoelectric effect, exports phase locking unit i to;
Phase locking unit i is used for the phase place of the analog electrical signal that receives is locked, and has guaranteed that like this phase place of signal is constant, reduces the interference of the phase noise that brings in the photoelectric conversion process, exports summation module to;
Summation module is used for the N road analog electrical signal that receives is utilized the add circuit addition together, sends, and exports antenna to;
Antenna is used for the analog electrical signal that receives is launched;
The wireless fusion method of light of a kind of minimum shift keying (GMSK) based on gaussian filtering, this method comprises:
A, by input with adjust data parameters in N the module, utilize address logic generation digital electric signal, and utilize digital-to-analogue conversion to be translated into the 2N road analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal; Described address logic is the pairing sine in address, the cosine function value table that is generated by system logic; Described digital-to-analogue conversion is that digital signal is converted to analog signal; Described N is the positive integer more than or equal to 1;
B, utilize independently light signal of wide range light signal generating N+1 road, light signal to N road is wherein modulated by external modulation technology and the analog electrical signal that receives, one road light signal is not modulated, and compound N road light signal of modulating and unmodulated light signal; Described external modulation technology refers to not to be signal directly to be loaded on the laser modulate, but realizes the light modulation techniques of signal modulation on the modulator externally; The sequence number of the described N road light signal of modulating is i; The sequence number of described unmodulated light signal is 0; Described i is more than or equal to 1 and smaller or equal to the positive integer of N;
C, N+1 road light signal to receiving, i road light signal and the 0 road light signal utilize opto-electronic conversion, obtain the analog electrical signal of one road suitable transmitting terminal, analog electrical signal are received and handles the data that obtain to comprise information; Described opto-electronic conversion promptly utilizes photoelectric effect that light signal is converted to corresponding electric signal; Described transmitting terminal is for being fit to send the antenna of signal;
In the said method, steps A is described by the data parameters in input and the adjusting module, utilize address logic to produce digital electric signal, and the method for utilizing digital-to-analogue conversion to be translated into the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal comprises:
A1, in N AWG (Arbitrary Waveform Generator) of N road serial binary high-speed data bit input, by cos (t) and two tables of sin θ (t) of making in advance in the address logic, read out corresponding numerical value respectively, obtain corresponding cos θ (t) and sin θ (t) waveform;
A2, the digital electric signal that obtains is gone here and there and changed, obtain the parallel data signal of two-way identical data transmission rate;
A3, the digital data signal that two-way is parallel carry out digital-to-analogue conversion, and carry out low-pass filtering, obtain corresponding analog electrical signal; Described low-pass filtering promptly utilizes low pass filter that analog signal is carried out filtering, the filtering high-frequency signal;
In the said method, the described independently light signal of wide range light signal generating N+1 road that utilizes of step B, light signal to N road is wherein modulated by external modulation technology and the analog electrical signal that receives, one road light signal is not modulated, and the compound N road light signal of modulating and unmodulated light signal method comprise:
B1, utilize tunable optic filter that the light signal that contains N+1 centre frequency that the wide range laser produces is cut apart, acquisition N+1 road frequency is λ
0, λ
1..., λ
NThe independent light signal;
B2, be λ with frequency
iLight signal be divided into the two ways of optical signals of same nature, one road light signal enters horse pool modulator 2i and modulates with the analog electrical signal that receives; The phase shift of pi/2 is carried out on another road earlier, enters horse pool modulator 2i-1 again and modulates with the analog electrical signal that receives;
B3, be λ with modulated centre frequency among the step B2
iTwo ways of optical signals be coupled;
B4, be λ with light signal and one road idle frequency after the N road modulation
0Optical multiplexed signal be combined on the same route and transmit;
B5, the light signal on compound N+1 road is carried out the as far as possible little amplification of distortion by Erbium-Doped Fiber Amplifier, and be placed on the optical fiber and transmit;
In the said method, N+1 road light signal to receiving described in the step C, i road light signal and the 0 road light signal utilize opto-electronic conversion, obtain one tunnel analog electrical signal that is fit to emission, and the method that analog electrical signal is received and handles the data that obtain to comprise information comprises:
C1, the light signal that receives is carried out demultiplexing, obtain independently light signal of N+1 road;
C2, be λ with frequency
0The 0 road light signal be divided into the light signal of N road same nature;
C3, i road light signal and the 0 road light signal merged become one road light signal;
C4, by photoelectric detector the synthetic light signal among the step C3 is carried out Photoelectric Detection, the light signal that receives is converted to the signal of telecommunication, the horizontal lock of going forward side by side is handled, and the phase noise that brings in the filtering Photoelectric Detection process obtains one road signal of telecommunication; Described Photoelectric Detection is an opto-electronic conversion, is expressed as on mathematics light signal is asked modular arithmetic; Described one road signal of telecommunication comprises direct current signal, modulation signal and corresponding frequency-doubled signal;
C5, the N road signal of telecommunication that step C4 is obtained are synthesized together, and transmit through one section wireless channel module; Described one road signal of telecommunication that step C4 is obtained carries out bandpass filtering, removes the direct current signal and the baseband signal that comprise in the described signal of telecommunication, the mm wave RF signal of the information of carrying that emission obtains;
C6, to the direct current signal that carries out bandpass filtering through the signal of telecommunication after the wireless channel transmission, remove comprising in the described signal of telecommunication with and frequency-doubled signal, obtain to comprise the N road intermediate frequency analog electrical signal of data message;
C7, N road analog electrical signal is carried out analog-to-digital conversion is digital electric signal, and signal is divided into two-way, and one the tunnel multiplies each other with sine wave signal, and one the tunnel multiplies each other with cosine wave signal; The frequency of described sine wave signal and cosine wave signal is identical with carrier frequency.
C8, two paths of signals is carried out low-pass filtering respectively, leach wherein direct current, radio-frequency component, sampling, judgement that the signal that obtains is pursued symbol.
C9, carry out and go here and there conversion, obtain N road serial binary high-speed data bit.
By above technical scheme as seen, the invention provides a kind of system and method for the wireless fusion of light based on Gaussian Minimum Shift-frequency Keying (GMSK), utilize GMSK that data message is modulated in this system, and the signal that uses the N road to carry information transmits simultaneously, with respect to existing ROF system based on QPSK, the capacity that it has improved system greatly makes a plurality of users to transmit simultaneously, and a kind of system and method for multi-user communication effectively is provided.
Description of drawings
Fig. 1 is the structural representation of the ROF system of existing QPSK.
Fig. 2 is the structural representation that the present invention is based on the wireless emerging system of light of Gaussian Minimum Shift-frequency Keying.
Fig. 3 is the flow chart that the present invention is based on the wireless fusion method of light of Gaussian Minimum Shift-frequency Keying.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The invention provides a wireless emerging system of the light based on Gaussian Minimum Shift-frequency Keying and method, the N that signalling comprises in this a system signal source module utilizes address logic to produce the 2N way word signal of telecommunication, and digital to analog converter is converted to analog electrical signal to it; Chain circuit device utilizes independently light signal of wide range light signal generating N+1 road, and the light signal on the N road of wherein modulating is modulated by external modulation technology and the analog electrical signal that receives, the light signal and the one road unmodulated light signal of output N road GMSK modulation; Receiving system carries out opto-electronic conversion to the N+1 road light signal that receives to be handled, and obtains to be fit to the analog electrical signal of emission, analog electrical signal is received and handles the data that obtain to comprise information, has realized that the light of GMSK signal infinitely transmits.
Fig. 2 is the structural representation that the present invention is based on the wireless emerging system of light of Gaussian Minimum Shift-frequency Keying, and is existing in conjunction with Fig. 2, and the structure of the wireless emerging system of light that the present invention is based on Gaussian Minimum Shift-frequency Keying is described, specific as follows:
For sake of clarity, earlier the wireless emerging system of the light that the present invention is based on Gaussian Minimum Shift-frequency Keying is defined, the ROF system of GMSK of the present invention can produce the signal that information is carried on the N road, and this N road signal is carried out light modulation and accepts processing, and wherein N is the positive integer more than or equal to 1.
The wireless emerging system of light that the present invention is based on Gaussian Minimum Shift-frequency Keying comprises: signalling 20, chain circuit device 21, receiving system 22.
Signalling 20 comprises N signal source module, is used to produce 2N road analog electrical signal to chain circuit device; Wherein, each signal source module in N signal source module utilizes address logic to produce the two-way digital electric signal, and utilize digital-to-analogue conversion to be translated into the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal respectively, the output analog electrical signal is to chain circuit device; Address logic is the pairing sine in address, the cosine function value table that is generated by system logic; Digital-to-analogue conversion is that digital signal is converted to analog signal; N is the positive integer more than or equal to 1.
Chain circuit device 21 utilizes independently light signal of wide range light signal generating N+1 road, the light signal on the N road of wherein modulating is modulated by external modulation technology and the analog electrical signal that receives, and the light signal of output N road GMSK modulation and one road unmodulated light signal are to receiving system; , wherein, the external modulation technology refers to not to be signal directly to be loaded on the laser modulate, but realizes the light modulation techniques of signal modulation on the modulator externally; The sequence number of the light signal on the N road of modulating is i; The sequence number of unmodulated light signal is 0; I is more than or equal to 1 and smaller or equal to the positive integer of N.
Receiving system 22 is used for the N+1 road light signal to receiving, and i road light signal and the 0 road light signal utilize opto-electronic conversion, obtains one the tunnel and is fit to the analog electrical signal that transmitting terminal is launched, and analog electrical signal is received and handles the data that obtain to comprise information; Wherein, opto-electronic conversion promptly utilizes photoelectric effect that light signal is converted to corresponding electric signal; Transmitting terminal is for being fit to send the antenna of signal.
Wherein, signalling 20 comprises N AWG (Arbitrary Waveform Generator) (AWG) 200.
AWG (Arbitrary Waveform Generator) (AWG) 200 output analog electrical signals are to chain circuit device 21, and wherein, the AWG (Arbitrary Waveform Generator) that adopts in the system of the present invention can be controlled output signal by control end, and output two-way analog electrical signal is to chain circuit device 21.
Chain circuit device 21 comprises wide range laser 210, tunable optic filter 211, a N splitter 212, a N horse pool modulator 213, a N phase-shifter 214, a N horse pool modulator 215, a N adder 216, multiplexer 217, image intensifer 218 and light 219.
Wide range laser 210 output light signals export tunable optic filter 211 to as the carrier wave of the information of transmission.
Tunable optic filter 211 1 ends link to each other with wide range laser 210, receive the light signal of wide range laser 210 outputs, a road have the light signal of a plurality of frequencies to be divided into the independently different light signal of centre frequency of N+1 road with what receive; Other end output N+1 road is the different light signal of centre frequency independently, and wherein N road light signal is to splitter 212, and one road light signal is to multiplexer 217; Wherein, can adopt the tunable optic filter based on the photon filter of cascade, its basic principle is existing technology contents.The basic principle of existing brief description tunable optic filter 211, be specially: tunable optic filter is formed by two different tunable optical subfilter part cascades, be respectively infinite impulse response (IIR) filter segment and finite impulse response (FIR) (FIR) filter segment, light carrier at first partly forms narrow broadband response through IIR, then by FIR part to the IIR part formed response carry out centre frequency and select, input contains the light signal of N+1 centre frequency through after the effect of filter, and output N+1 road is light signal independently.
Each splitter 212 in N splitter is used for a road light signal that receives from tunable optic filter 211 is divided into the light signal of two-way same nature transmission, exports horse pool modulator 213 and phase-shifter 214 respectively to.
The analog electrical signal of horse pool modulator 213 difference received signal devices 20 outputs is to the light signal of its biased electrical pressure side and splitter 212 outputs, and the output modulated light signal is to adder 216; Horse pool modulator 213 utilizes direct intensity that analog electrical signal is modulated on the light signal, and concrete modulator approach is existing technology contents.The method of existing brief description horse pool modulator 213 signals modulation, be specially: horse pool modulator 213 will be divided into two from the light signal that input port receives and restraint respectively two waveguide arms in modulator and propagate, utilize electro optic effect and different input data to change bias voltage on two waveguide arms, thereby change the refractive index of waveguide, the light that transmits in two waveguide arms can have different phase differences so, the intensity difference of the different light signals that can make output of the light beam phase place of two waveguide arms output so, thus realize the modulation of analog electrical signal to light signal.
The phase place of the road light signal that phase-shifter 214 will receive is carried out the change of pi/2, and the light signal after the output change phase place is to horse pool modulator 215; Wherein, phase-shifter can adopt the medium phase-shifter, promptly inserts the phase place that dieelctric sheet changes light wave and realize in waveguide.
Horse pool modulator 215, one ends link to each other with phase-shifter 214, and the other end exports adder 216 to; Wherein, with horse pool modulator 213 be same device, function is identical, but the input and output difference.
Light signal after the modulation that adder 216 is used for reception horse pool modulator 213 and horse pool modulator 215 are exported synthesizes, and exports one road signal to multiplexer 217.
Multiplexer 217 is used for the same direction that the N+1 road optical multiplexed signal that receives is bonded on one road route is transmitted, and exports image intensifer 218 to.Multiplexer 217 can adopt array waveguide grating (AWG) to realize, wherein AWG comprises input waveguide, two plane coupled waveguides, Waveguide array and output waveguides; When N+1 independently light signal entered input waveguide, the light signal of input entered first plane coupled waveguide through input waveguide earlier, and the light signal that the centre wavelength in the light signal is different in first plane coupled waveguide diffraction takes place and is coupled into Waveguide array; Because Waveguide array is to be made of the waveguide that a lot of length increase progressively successively, phase delay takes place behind the different waveguide path in Waveguide array in the light signal behind the diffraction, the light signal of Waveguide array output coherent superposition in the second plane coupled waveguide produces one tunnel light signal independently together.
Image intensifer 218 links to each other with multiplexer, the amplification of the light signal received of being used to achieve a butt joint, and export light 219 to; Wherein, image intensifer 218 can adopt erbium-doped fiber amplifier (EDFA) to realize, the operation principle of EDFA is the prior art content.The operation principle of existing brief description image intensifer 218, be specially: when making optical fiber, adopt special process, mix the erbium ion of minimum concentration in the fiber core layer deposition, produce corresponding Er-doped fiber, dopant ion is being subjected to transitting to metastable highly excited level after the pump light excitation in the optical fiber, induce down at flashlight, produce stimulated radiation, thereby form the relevant amplification to flashlight, its concrete structure does not repeat them here.
Optical fiber 219 is used for the light signal that receives is reached the receiving terminal in a distant place, and wherein, what adopted is the G.655 optical fiber of 50km.
Receiving system 22 comprises demodulation multiplexer 220, a N optical band pass filter 221, optical band pass filter 222, splitter 223, a N adder 224, a N photoelectric detector 225, a N phase locking unit 226, adder 227, wireless channel 228, a N band pass filter 229 and N off-line digital signal processing 2210.
Demodulation multiplexer 220 is used for the light signal that contains N+1 centre frequency that receives from chain circuit device is cut apart, obtain independently light signal of N+1 road, the light signal that output was modulated is exported unmodulated light signal to optical band pass filter 222. to optical band pass filter 221; Demodulation multiplexer can realize that its principle is identical with multiplexer 217 with existing waveguide array grating (AWG), and wherein input is 1, and output is N+1, no longer its structure is given unnecessary details at this.
Optical band pass filter 221 1 ends connect demodulation multiplexer 220, receive the light signal of the modulation of demodulation multiplexer 220 outputs, be used for the light signal that receives is carried out bandpass filtering, remove the noise and the interference that are mingled with in the independently light signal that receives, export adder 224 to.
Optical band pass filter 222 1 ends connect demodulation multiplexer 220, receive the unmodulated light signal that demodulation multiplexer 220 is breathed out, and export splitter 223 to; Wherein, with optical band pass filter 221 be same during, but output is different.
Splitter 223 is used for the light signal of optical band pass filter 222 outputs that receive is divided into the light signal of N road same nature transmission to adder 224; Wherein, the splitter with chain circuit device is same device.
Adder 224, be used for receive optical band pass filter 221 and splitter 223 outputs light signal synthetic, export one road signal to photoelectric detector 225; Wherein, with chain circuit device in adder be same device.
Photoelectric detector 225 receives the light signal of adder 224 outputs, by photoelectric effect the light signal that receives is converted into associated analog electrical signal, the output signal of telecommunication is to phase locking unit 226, the concrete operation principle of photoelectric detector 225 is: after light signal enters photoelectric detector 225, the energy of light is absorbed by the P-N of inside knot, forms photoelectric current, along with the intensity difference of light signal, the size of the output signal of telecommunication is also just different, has just finished the conversion of light signal to the signal of telecommunication.
One termination of phase locking unit 226 is received the signal of telecommunication of photoelectric detector 225 outputs, and the other end exports adder 227 to; Utilize phase-locked loop circuit, the phase place of the signal of telecommunication that receives is locked, to reduce the influence of the phase noise that signal is subjected in the Photoelectric Detection process, improve sensitivity, phase locking unit is made of phase-locked loop, and its basic principle is the prior art content.The operation principle of existing brief description phase locking unit 226, specific as follows: phase-locked loop mainly is made up of phase reference extraction circuit, voltage controlled oscillator, phase comparator, control circuit, what voltage controlled oscillator was exported is the constant-amplitude signal very approaching with needing frequency, send the output signal of voltage controlled oscillator with by the reference signal that phase reference extraction circuit extracts into phase comparator simultaneously from signal, with the error that relatively forms the frequency of voltage controlled oscillator is changed continuously to the direction that reduces Error Absolute Value, realize phase-lockedly, its structure does not repeat them here.
Adder 227 receives the signal of telecommunication that phase locking unit 226 is exported, and this N signal of telecommunication addition launched together, exports wireless channel 228 to.
Wireless channel 228 is channels of transmitting wireless signals, is used for the process that analog wireless signals transmits in air, and the signal after the output transmission is to band pass filter 229.
Band pass filter 229 receives the signal of telecommunication after the transmission, carries out bandpass filtering, obtains to carry the signal of telecommunication of signal, and filtering noise and interference export off-line digital signal processing 2210 to; Wherein, the centre frequency of each band pass filter among the present invention is identical with the frequency of the signal of telecommunication of being launched that carries signal.
Off-line digital signal processing 2210 is used for the signal that comprises data message that receives is carried out Digital Signal Processing, obtains data message; Wherein, off-line digital signal processing 2210 can adopt Digital Signal Processing (DSP) chip to handle to the received signal.
Fig. 3 is the flow chart that the present invention is based on the wireless fusion method of light of Gaussian Minimum Shift-frequency Keying.Now, based on the wireless fusion method process specification of the light of Gaussian Minimum Shift-frequency Keying, specific as follows to invention in conjunction with Fig. 3:
Step 301:, utilize address logic to produce digital electric signal, and utilize digital-to-analogue conversion to be translated into the 2N road analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal by the data parameters in input and N module of adjustment:
In this step, the method that produces 2N road analog electrical signal comprises:
3011: in N AWG (Arbitrary Waveform Generator) of N road serial binary high-speed data bit input, by cos θ (t) and two tables of sin θ (t) of making in advance in the address logic, read out corresponding numerical value respectively, obtain corresponding cos θ (t) and sin θ (t) waveform;
3012: the digital electric signal that obtains is gone here and there and changed, obtain the parallel data signal of two-way identical data transmission rate;
3013: the digital data signal that two-way is parallel carries out digital-to-analogue conversion, and carries out low-pass filtering, obtains corresponding analog electrical signal; Described low-pass filtering promptly utilizes low pass filter that analog signal is carried out filtering, the filtering high-frequency signal;
Step 302: utilize independently light signal of wide range light signal generating N+1 road, light signal to N road is wherein modulated by external modulation technology and the analog electrical signal that receives, one road light signal is not modulated, and compound N road light signal of modulating and unmodulated light signal:
In this step, the method for produce light signal, light signal being modulated comprises:
3021: utilize tunable optic filter that the light signal that contains N+1 centre frequency that the wide range laser produces is cut apart, obtaining N+1 road frequency is λ
0, λ
1..., λ
NThe independent light signal;
3022: with frequency is λ
iLight signal be divided into the two ways of optical signals of same nature, one road light signal enters horse pool modulator 2i and modulates with the analog electrical signal that receives; The phase shift of pi/2 is carried out on another road earlier, enters horse pool modulator 2i-1 again and modulates with the analog electrical signal that receives;
3023: with modulated centre frequency among the step B2 is λ
iTwo ways of optical signals be coupled;
3024: with light signal and one road idle frequency after the modulation of N road is λ
0Optical multiplexed signal be combined on the same route and transmit;
3025: the light signal on compound N+1 road is carried out the as far as possible little amplification of distortion by Erbium-Doped Fiber Amplifier, and be placed on the optical fiber and transmit;
Step 303: to the N+1 road light signal that receives, i road light signal and the 0 road light signal utilize opto-electronic conversion, obtain the analog electrical signal of one road suitable emission, analog electrical signal are received and handles the data that obtain to comprise information;
In this step, the method that obtains analog electrical signal and receive processing comprises:
3031: the light signal that receives is carried out demultiplexing, obtain independently light signal of N+1 road;
3032: with frequency is λ
0The 0 road light signal be divided into the light signal of N road same nature;
3033: with i road light signal and the 0 road light signal merging becoming one road light signal;
3034: by photoelectric detector the synthetic light signal among the step C3 is carried out Photoelectric Detection, the light signal that receives is converted to the signal of telecommunication, the horizontal lock of going forward side by side is handled, and the phase noise that brings in the filtering Photoelectric Detection process obtains one road signal of telecommunication; Described Photoelectric Detection is an opto-electronic conversion, is expressed as on mathematics light signal is asked modular arithmetic; Described one road signal of telecommunication comprises direct current signal, modulation signal and corresponding frequency-doubled signal;
3035: the N road signal of telecommunication that step C4 is obtained is synthesized together, and transmits through one section wireless channel module; Described one road signal of telecommunication that step C4 is obtained carries out bandpass filtering, removes the direct current signal and the baseband signal that comprise in the described signal of telecommunication, the mm wave RF signal of the information of carrying that emission obtains;
3036:, obtain to comprise the N road intermediate frequency analog electrical signal of data message to carrying out bandpass filtering through the signal of telecommunication after the wireless channel transmission, remove the direct current signal that comprises in the described signal of telecommunication and reaching frequency-doubled signal;
3037 N road analog electrical signal is carried out analog-to-digital conversion is digital electric signal, and signal is divided into two-way, and one the tunnel multiplies each other with sine wave signal, and one the tunnel multiplies each other with cosine wave signal; The frequency of described sine wave signal and cosine wave signal is identical with carrier frequency.
3038 pairs of two paths of signals carry out low-pass filtering respectively, leach wherein direct current, radio-frequency component, sampling, judgement that the signal that obtains is pursued symbol.
3039: carry out and go here and there conversion, obtain N road serial binary high-speed data bit.
In the above-mentioned example of the present invention, the transmission that has comprised the N road comprises the data-signal of information, compares the transmission by multichannel in same system with existing ROF system, can effectively increase the capacity of system, the capability improving that provides the user to serve, the signal of N road transmission is mutually orthogonal, can not produce interference each other, the sensitivity of receiving terminal also can improve, can reduce system cost greatly, improve the ROF systematic function, effectively provide the multi-user to serve.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. the wireless fusion of light (ROF) system based on Gaussian Minimum Shift-frequency Keying (GMSK), be used for the generation that modulation format is the GMSK signal, use the ROF technology on optical link, to handle and transmit this GMSK signal, and process with its emission reception, it is characterized in that this system comprises: signalling, chain circuit device and receiving system:
Described signalling comprises N signal source module, is used to produce 2N road analog electrical signal to chain circuit device; Each signal source module in the described N signal source module utilizes address logic to produce the two-way digital electric signal, and utilize digital-to-analogue conversion to be translated into the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal respectively, the output analog electrical signal is to chain circuit device; Described address logic is the pairing sine in address, the cosine function value table that is generated by system logic; Described digital-to-analogue conversion is that digital signal is converted to analog signal; Described N is the positive integer more than or equal to 1;
Described chain circuit device utilizes independently light signal of wide range light signal generating N+1 road, the light signal on the N road of wherein modulating is modulated by external modulation technology and the analog electrical signal that receives, and the light signal of output N road GMSK modulation and one road unmodulated light signal are to receiving system; Described external modulation technology refers to not to be signal directly to be loaded on the laser modulate, but realizes the light modulation techniques of signal modulation on the modulator externally; The sequence number of the light signal on described N road of modulating is i; The sequence number of described unmodulated light signal is 0; Described i is more than or equal to 1 and smaller or equal to the positive integer of N;
Described receiving system is used for the N+1 road light signal to receiving, and i road light signal and the 0 road light signal utilize opto-electronic conversion, obtains one the tunnel and is fit to the analog electrical signal that transmitting terminal is launched, and analog electrical signal is received and handles the data that obtain to comprise information; Described opto-electronic conversion promptly utilizes photoelectric effect that light signal is converted to corresponding electric signal; Described transmitting terminal is for being fit to send the antenna of signal;
2. the wireless emerging system of light of the minimum shift keying based on gaussian filtering according to claim 1 is characterized in that each signal source module in the described N signal source module comprises:
Pulse train is carried out shaping by offset of sinusoidal ripple signal, and sinusoidal signal is shaped as the pulse sequence signal that system needs, and exports the address logic module to;
Address logic, the pulse train that is used for receiving is converted to corresponding sine, cosine function value, by being solidificated in the random data table in the internal memory, take out corresponding signal discrete value according to the address, pulse sequence signal is converted to sine, cosine waveform digital electric signal, respectively output independently the 2i-1 way word signal of telecommunication and the 2i way word signal of telecommunication to its digital to analog converter;
Digital-to-analogue conversion, be used for is the 2i-1 way word signal of telecommunication that receives and 2i way word electrical signal conversion the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal respectively, pass through analog operational circuit, digital electric signal is converted to corresponding analog electrical signal, exports 2i-1 road analog electrical signal and 2i road analog electrical signal to chain circuit device;
3. the wireless emerging system of light of the minimum shift keying based on gaussian filtering according to claim 1 is characterized in that described chain circuit device comprises:
Wide spectrum light source is used to produce the light signal that is adapted at transmitting on the optical fiber, as the light signal in the link, exports suitable light signal to comb filter;
Comb filter, be used for the light signal that contains a plurality of frequencies that will receive,, only allow the signal of some characteristic frequency pass through by press the passband and the stopband of certain frequency interval aligned identical, select the light signal of the frequency that needs, the individual independently light signal of the N+1 that output is selected is to channel-splitting filter;
Channel-splitting filter is used for the N+1 that receives that independently light signal is separated from one another comes, and enters different light paths respectively and transmits, and exports i road light signal to splitter i, exports the 0 road light signal to multiplexer;
Splitter i is used for 2i-1 and 2i road light signal that an i road light signal that receives is divided into the same nature of two-way parallel transmission, exports 2i-1 road light signal to the pi/2 phase shift module, exports 2i road light signal to signal modulator 2i;
The pi/2 phase shift module, be used for the phase place of the 2i-1 road light signal that receives is carried out the variation of pi/2, guaranteed that the pi/2 phase between 2i-1 road light signal and the 2i road light signal is poor, guaranteed the orthogonality relation between the two paths of signals, the light signal after the output phase shift is to signal modulator 2i-1;
Signal modulator, be used for the 2N road analog electrical signal that receives is modulated to light signal, 2N road light signal entering signal modulator, and the signal of telecommunication control end of the 2N road analog electrical signal entering signal modulator that provides by signalling, voltage by the signal modulator offset side constantly changes, realize the modulation of analog signal, and export modulated 2N road light signal to summation module to light signal;
Summation module is used for the 2i-1 road light signal and the 2i road light signal that receive are combined into the light signal that transmits on the optical link, and the light signal of output N road independence GMSK modulation is to multiplexer;
Multiplexer, be used for receive modulated N road independently the same direction that is bonded on one road route of light signal and unmodulated one road optical multiplexed signal transmit, export signal after compound to image intensifer;
Image intensifer is used for the light signal that receives is carried out the as far as possible little amplification of distortion, has avoided like this obscuring in noise too greatly in signal long-distance transmission back decay, causes and can't accurately the signal demodulation be come out, and exports optical fiber to;
Optical fiber is used for providing to light signal the path of long Distance Transmission as transmission medium, exports receiving system to;
4. the wireless emerging system of light of the minimum shift keying based on gaussian filtering according to claim 1 is characterized in that described receiving system comprises:
Demodulation multiplexer is cut apart the road light signal that contains N+1 centre frequency that receives, and obtains independently light signal of N+1 road, exports the 0 road light signal to band pass filter 0, exports i road light signal to band pass filter i;
Optical band pass filter is used for the light signal that receives is carried out bandpass filtering, and optical band pass filter 0 exports splitter 0 to, and optical band pass filter i exports summation module i to; Described bandpass filtering promptly only passes through centre frequency, filtering low-and high-frequency light signal;
Splitter 0 is used for the N road light signal that the 0 road light signal that receives is divided into the same nature of parallel transmission, exports N summation module respectively to;
Summation module i is used for the i road light signal and the 0 road light signal that receive are combined into the light signal that transmits on the optical link, and the output light signal is to photoelectric detector i;
Photoelectric detector i is used for i road light signal that receives and the synthetic light signal of the 0 road light signal are converted to associated analog electrical signal by photoelectric effect, exports phase locking unit i to;
Phase locking unit i is used for the phase place of the analog electrical signal that receives is locked, and has guaranteed that like this phase place of signal is constant, reduces the interference of the phase noise that brings in the photoelectric conversion process, exports summation module to;
Summation module is used for the N road analog electrical signal that receives is utilized the add circuit addition together, sends, and exports antenna to;
Antenna is used for the analog electrical signal that receives is launched;
5. wireless fusion method of the light based on the minimum shift keying of gaussian filtering is characterized in that this method comprises:
A, by input with adjust data parameters in N the module, utilize address logic generation digital electric signal, and utilize digital-to-analogue conversion to be translated into the 2N road analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal; Described address logic is the pairing sine in address, the cosine function value table that is generated by system logic; Described digital-to-analogue conversion is that digital signal is converted to analog signal; Described N is the positive integer more than or equal to 1;
B, utilize independently light signal of wide range light signal generating N+1 road, light signal to N road is wherein modulated by external modulation technology and the analog electrical signal that receives, one road light signal is not modulated, and compound N road light signal of modulating and unmodulated light signal; Described external modulation technology refers to not to be signal directly to be loaded on the laser modulate, but realizes the light modulation techniques of signal modulation on the modulator externally; The sequence number of the described N road light signal of modulating is i; The sequence number of described unmodulated light signal is 0; Described i is more than or equal to 1 and smaller or equal to the positive integer of N;
C, N+1 road light signal to receiving, i road light signal and the 0 road light signal utilize opto-electronic conversion, obtain one the tunnel and are fit to the analog electrical signal that transmitting terminal is launched, and analog electrical signal are received and handles the data that obtain to comprise information; Described opto-electronic conversion promptly utilizes photoelectric effect that light signal is converted to corresponding electric signal; Described transmitting terminal is for being fit to send the antenna of signal;
6. method according to claim 4, it is characterized in that, steps A is described by the data parameters in input and the adjusting module, utilize address logic to produce digital electric signal, and the method for utilizing digital-to-analogue conversion to be translated into the analog electrical signal of higher waveform of spectrum efficiency and suitable modulated light signal comprises:
A1, in N AWG (Arbitrary Waveform Generator) of N road serial binary high-speed data bit input, by cos θ (t) and two tables of sin θ (t) of making in advance in the address logic, read out corresponding numerical value respectively, obtain corresponding cos θ (t) and sin θ (t) waveform;
A2, the digital electric signal that obtains is gone here and there and changed, obtain the parallel data signal of two-way identical data transmission rate;
A3, the digital data signal that two-way is parallel carry out digital-to-analogue conversion, and carry out low-pass filtering, obtain corresponding analog electrical signal; Described low-pass filtering promptly utilizes low pass filter that analog signal is carried out filtering, the filtering high-frequency signal;
7. method according to claim 4, it is characterized in that, the described independently light signal of wide range light signal generating N+1 road that utilizes of step B, light signal to N road is wherein modulated by external modulation technology and the analog electrical signal that receives, one road light signal is not modulated, and the compound N road light signal of modulating and unmodulated light signal method comprise:
B1, utilize tunable optic filter that the light signal that contains N+1 centre frequency that the wide range laser produces is cut apart, acquisition N+1 road frequency is λ
0, λ
1..., λ
NThe independent light signal;
B2, be λ with frequency
iLight signal be divided into the two ways of optical signals of same nature, one road light signal enters horse pool modulator 2i and modulates with the analog electrical signal that receives; The phase shift of pi/2 is carried out on another road earlier, enters horse pool modulator 2i-1 again and modulates with the analog electrical signal that receives;
B3, be λ with modulated centre frequency among the step B2
iTwo ways of optical signals be coupled;
B4, be λ with light signal and one road idle frequency after the N road modulation
0Optical multiplexed signal be combined on the same route and transmit;
B5, the light signal on compound N+1 road is carried out the as far as possible little amplification of distortion by Erbium-Doped Fiber Amplifier, and be placed on the optical fiber and transmit;
8. method according to claim 4, it is characterized in that, N+1 road light signal to receiving described in the step C, i road light signal and the 0 road light signal utilize opto-electronic conversion, obtain one tunnel analog electrical signal that is fit to the transmitting terminal emission, the method that analog electrical signal is received and handles the data that obtain to comprise information comprises:
C1, the light signal that receives is carried out demultiplexing, obtain independently light signal of N+1 road;
C2, be λ with frequency
0The 0 road light signal be divided into the light signal of N road same nature;
C3, i road light signal and the 0 road light signal merged become one road light signal;
C4, by photoelectric detector the synthetic light signal among the step C3 is carried out Photoelectric Detection, the light signal that receives is converted to the signal of telecommunication, the horizontal lock of going forward side by side is handled, and the phase noise that brings in the filtering Photoelectric Detection process obtains one road signal of telecommunication; Described Photoelectric Detection is an opto-electronic conversion, is expressed as on mathematics light signal is asked modular arithmetic; Described one road signal of telecommunication comprises direct current signal, modulation signal and corresponding frequency-doubled signal;
C5, the N road signal of telecommunication that step C4 is obtained are synthesized together, and transmit through one section wireless channel module; Described one road signal of telecommunication that step C4 is obtained carries out bandpass filtering, removes the direct current signal and the baseband signal that comprise in the described signal of telecommunication, the mm wave RF signal of the information of carrying that emission obtains;
C6, to the direct current signal that carries out bandpass filtering through the signal of telecommunication after the wireless channel transmission, remove comprising in the described signal of telecommunication with and frequency-doubled signal, obtain to comprise the N road intermediate frequency analog electrical signal of data message;
C7, N road analog electrical signal is carried out analog-to-digital conversion is digital electric signal, and signal is divided into two-way, and one the tunnel multiplies each other with sine wave signal, and one the tunnel multiplies each other with cosine wave signal; The frequency of described sine wave signal and cosine wave signal is identical with carrier frequency.
C8, two paths of signals is carried out low-pass filtering respectively, leach wherein direct current, radio-frequency component, sampling, judgement that the signal that obtains is pursued symbol.
C9, carry out and go here and there conversion, obtain N road serial binary high-speed data bit.
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