CN108683457A - A kind of automodulation multicarrier optical fiber wireless communications method and system - Google Patents
A kind of automodulation multicarrier optical fiber wireless communications method and system Download PDFInfo
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- CN108683457A CN108683457A CN201810933462.7A CN201810933462A CN108683457A CN 108683457 A CN108683457 A CN 108683457A CN 201810933462 A CN201810933462 A CN 201810933462A CN 108683457 A CN108683457 A CN 108683457A
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- 238000004891 communication Methods 0.000 title claims abstract description 72
- 239000013307 optical fiber Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000035559 beat frequency Effects 0.000 claims abstract description 47
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000005693 optoelectronics Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
Abstract
The present invention provides a kind of automodulation multicarrier optical fiber wireless communications method and systems, including：Multiple binary digit base band sources, for generating binary digit baseband signal；Multiple central station end sinusoidal carrier signals source, for generating multiple sinusoidal carrier signals；Multiple central station end frequency mixers obtain multiple paths of single-carrier signals for mutual corresponding binary digit baseband signal and sinusoidal carrier signal to be mixed；One power combiner obtains multi-carrier signal for multiple paths of single-carrier signals to be carried out power combing；One semiconductor laser obtains light and carries millimeter-wave signal for multi-carrier signal to be modulated to light carrier；One photodetector carries out beat frequency for carrying millimeter-wave signal to light, obtains millimeter-wave signal.Implementation complexity and cost are reduced by automodulation, meanwhile, the simultaneous transmission multiple signals by way of multicarrier expand the capacity of communication, to improve the data volume of communication, optimize communication efficiency.
Description
Technical field
The present invention relates to optical fiber radio communication technical field more particularly to a kind of automodulation multicarrier optical fiber channel radios
Believe method and system.
Background technology
Future, the 5th third-generation mobile communication technology（5G）It will realize commercialization, and millimeter-wave technology is even more the key of 5G.But
Millimeter-wave signal cannot carry out the transmission of long range in air, and only by using wireless access technology, millimetre-wave attenuator is difficult to
Realize good communication efficiency.In order to solve this problem, it is proposed that RoF（Radio over Fiber, optical-fiber wireless）Technology,
It combines the advantages of soft exchange technology and wireless access technology, the i.e. spirit of fiber optic communication huge superiority bandwidth and mobile communication
Loose joint enters, and has provided the ideal scheme for the problems such as solving high bandwidth, large capacity and mobility to the user, this also makes RoF technologies
The most promising technology of broadband wireless access will be become.
In the RoF systems of the prior art, generation light carries there are mainly three types of the technologies of millimeter wave：Outside automodulation technology, light
Poor modulation technique and external modulation technology.The shortcomings that optical heterodyne modulation technology is to need to use two semiconductor lasers,
There are random phase noises, and prodigious influence will be caused on system.External modulation technology is frequently necessary to use at least two tune
Device processed, a modulator are used for modulates baseband signals to light carrier, another modulator is for inhibiting such as light carrier to believe
Number or other sideband signals, to realize the technologies such as optical carrier suppression or single sideband modulation, thus, will make central station
Cost increases.In contrast, automodulation technology be all light carry be easiest in millimeter-wave signal production methods, most simple, cost
Minimum method.But since the modulation bandwidth of traditional automodulation technology is limited, the data volume of communication can not be improved, greatly
Influence communication efficiency.
Therefore, the existing technology needs to be improved and developed.
Invention content
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of automodulation overloading
Glistening light of waves fibre wireless communications method and system can improve modulation bandwidth to improve the data volume of communication, optimize communication efficiency.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of automodulation multicarrier optical fiber wireless communications method, includes the following steps,
S1. multiple mutually different binary digit baseband signals and multiple mutually different sinusoidal carrier signals are obtained, one
Binary digit baseband signal corresponds to a sinusoidal carrier signal；
S2. mutual corresponding binary digit baseband signal and sinusoidal carrier signal are mixed, obtain MF Multi-Channel Per Carrier letter
Number；
S3. multiple paths of single-carrier signals is subjected to power combing, obtains multi-carrier signal；
S4. multi-carrier signal is modulated on light carrier, obtains light and carries millimeter-wave signal；
S5. millimeter-wave signal is carried to light and carries out beat frequency, obtain millimeter-wave signal.
Now compare with the prior art, the advantageous effect of the technical program is：Multi-carrier signal is modulated on light carrier and is obtained
Light carries millimeter-wave signal to be had the advantages that implementation complexity is low, reduces cost of implementation to realize automodulation；Meanwhile it will be more
A mutual corresponding binary digit baseband signal and sinusoidal carrier signal are mixed, then by obtaining overloading after power combing
Wave signal, the simultaneous transmission multiple signals by way of multicarrier expand the capacity of communication, to improve the data of communication
Amount optimizes communication efficiency.
Further, in the step S4, it is containing each order frequency component and light carrier point that the light, which carries millimeter-wave signal,
The light of amount carries millimeter-wave signal, and the step S4 further includes carrying millimeter wave to the light containing each order frequency component and optical carrier component
Signal is filtered, and obtains carrying millimeter-wave signal containing only the light of positive fundamental frequency component and optical carrier component；
In the step S5, carrying millimeter-wave signal progress beat frequency to light is specially：Millimeter is carried according to the light of positive fundamental frequency component
The light of wave signal and optical carrier component carries the difference on the frequency of millimeter-wave signal, obtains the millimeter-wave signal that frequency is the difference on the frequency.
Advantageous effect using the above scheme is：Millimeter-wave signal is carried to light to be filtered, and is removed other components, is obtained
Millimeter-wave signal is carried to the light containing only positive fundamental frequency component and optical carrier component, can be effectively that subsequent beat frequency does standard
It is standby；And the light that millimeter-wave signal and optical carrier component are carried according to the light of positive fundamental frequency component carry the difference on the frequency of millimeter-wave signal come
Beat frequency is carried out, then can reduce the generation of interference signal.
Further, further include being wirelessly transferred according to millimeter-wave signal after the step S5；
It includes the first wireless communication mode to carry out wireless transmission according to millimeter-wave signal, and first wireless communication mode specifically wraps
Include following steps：
Millimeter-wave signal is obtained to beat frequency and carries out bandpass filtering, obtains the multi-carrier signal after bandpass filtering；
Power amplification is carried out to multi-carrier signal；
The amplified multi-carrier signal of transmission power.
Advantageous effect using the above scheme is：On the one hand, interference signal can be introduced during beat frequency, filtering beat frequency obtains
It can effectively remove the interference signal introduced by beat frequency to millimeter-wave signal, only retain multi-carrier signal；On the other hand, directly right
Multi-carrier signal carries out power amplification and then launches, and terminal is subjected to multi-carrier signal, and different terminals can be according to reality
Situation demodulates multi-carrier signal.
Further, it further includes the second wireless communication mode to carry out wireless transmission according to millimeter-wave signal, second nothing
Line transmission mode specifically includes following steps：
Power distribution is carried out to the millimeter-wave signal that beat frequency obtains, obtains the identical multi-carrier signal of multichannel；
Bandpass filtering treatment is carried out to the identical multi-carrier signal in each road respectively, obtains the different single load of multichannel centre frequency
Wave signal；
Each single-carrier signal is subjected to power amplification；
The amplified each single-carrier signal of transmission power.
Advantageous effect using the above scheme is：Then launch not with directly power amplification is carried out to multi-carrier signal
Together, bandpass filtering treatment is carried out to the identical multi-carrier signal in each road respectively and obtains multiple paths of single-carrier signals, then each list is carried
Wave signal carries out power amplification and then launches, and can just be demodulated in base station according to the actual conditions of terminal, mitigates the negative of terminal
It carries.
Further, further include that error rate test is carried out according to millimeter-wave signal after the step S5；
Error rate test, which is carried out, according to millimeter-wave signal specifically includes following steps：
Millimeter-wave signal is obtained to beat frequency and carries out bandpass filtering, obtains the multi-carrier signal after bandpass filtering；
Power distribution is carried out to the multi-carrier signal after bandpass filtering, obtains the identical multi-carrier signal of multichannel；
Obtain the mutually different sinusoidal carrier signal of multichannel；
Each road multi-carrier signal and sinusoidal carrier signal corresponding with each road multi-carrier signal are mixed, by each road multicarrier
Spectrum component corresponding to signal moves lower frequency region, obtains the multi-carrier signal after multichannel mixing；
Multi-carrier signal after being mixed respectively to each road carries out low-pass filtering treatment, obtains multiple binary digit baseband signals；
Error rate test is carried out according to multiple binary digit baseband signals.
Advantageous effect using the above scheme is：Multi-carrier signal after mixing is restored binary digit base band letter
Number, then error rate test is carried out, it can easily assess communication quality.
A kind of automodulation multicarrier optical fiber radio communication system, including,
Multiple binary digit base band sources, for generating multiple mutually different binary digit baseband signals；
Multiple central station end sinusoidal carrier signals source, for generating multiple mutually different sinusoidal carrier signals, wherein one two
Binary digits baseband signal corresponds to a sinusoidal carrier signal；
Multiple central station end frequency mixers, for mixing mutual corresponding binary digit baseband signal and sinusoidal carrier signal
Frequently, multiple paths of single-carrier signals is obtained；
One power combiner obtains multi-carrier signal for multiple paths of single-carrier signals to be carried out power combing；
One semiconductor laser obtains light and carries millimeter-wave signal for multi-carrier signal to be modulated to light carrier；
One photodetector carries out beat frequency for carrying millimeter-wave signal to light, obtains millimeter-wave signal.
Further, it is to carry millimeter wave containing the light of each order frequency component and optical carrier component that the light, which carries millimeter-wave signal,
Signal；
The system also includes an optical band pass filter, the optical band pass filter is used for containing each order frequency component and light
The light of carrier component carries millimeter-wave signal and is filtered, and obtains carrying containing only the light of positive fundamental frequency component and optical carrier component
Millimeter-wave signal；
The photodetector light carries millimeter-wave signal progress beat frequency：Millimeter wave is carried according to the light of positive fundamental frequency component
The light of signal and optical carrier component carries the difference on the frequency of millimeter-wave signal, obtains the millimeter-wave signal that frequency is the difference on the frequency.
Further, further include the first wireless transport module, first wireless transport module includes：
One electric bandpass filter carries out bandpass filtering for obtaining millimeter-wave signal to beat frequency, obtains more after bandpass filtering
Carrier signal；
One power amplifier, for carrying out power amplification to multi-carrier signal；
One antenna is used for the amplified multi-carrier signal of transmission power.
Further, further include the second wireless transport module, second wireless transport module includes：
One power divider, the millimeter-wave signal for being obtained to beat frequency carry out power distribution, obtain the identical overloading of multichannel
Wave signal；
Multiple electricity bandpass filters, carry out bandpass filtering treatment to the identical multi-carrier signal in each road respectively, obtain multichannel center
The different single-carrier signal of frequency；
Multiple power amplifiers, for each single-carrier signal to be carried out power amplification；
Mutiple antennas is used for the amplified each single-carrier signal of transmission power.
Further, further include error rate test module, the error rate test module includes：
One electric bandpass filter carries out bandpass filtering for obtaining millimeter-wave signal to beat frequency, obtains more after bandpass filtering
Carrier signal；
One power divider obtains the identical multicarrier of multichannel for carrying out power distribution to filtered multi-carrier signal
Signal；
Multiple base station end sinusoidal carrier signals source, for generating the mutually different sinusoidal carrier signal of multichannel；
Multiple base station end frequency mixers, for respectively to each road multi-carrier signal and sinusoidal carrier corresponding with each road multi-carrier signal
Signal is mixed, and the spectrum component corresponding to each road multi-carrier signal is moved lower frequency region, is obtained more after multichannel mixing
Carrier signal；
Multiple electricity low-pass filters carry out low-pass filtering treatment for the multi-carrier signal after being mixed respectively to each road, and demodulation is more
A binary digit baseband signal；
One error rate tester, for carrying out error rate test according to the multiple binary digit baseband signals demodulated.
Description of the drawings
Fig. 1 is a kind of flow chart of automodulation multicarrier optical fiber wireless communications method of the present invention.
Fig. 2 is a kind of schematic diagram of automodulation multicarrier optical fiber radio communication system of the present invention.
Fig. 3 is a kind of signal of first wireless transport module of automodulation multicarrier optical fiber radio communication system of the present invention
Figure.
Fig. 4 is a kind of signal of second wireless transport module of automodulation multicarrier optical fiber radio communication system of the present invention
Figure.
Fig. 5 is a kind of schematic diagram of the error rate test module of automodulation multicarrier optical fiber radio communication system of the present invention.
Fig. 6 is the millimeter after electric bandpass filter in a kind of automodulation multicarrier optical fiber radio communication system of the present invention
The spectrogram of wave signal.
Fig. 7 is the eye pattern in the channel that carrier wave is 30GHz in a kind of automodulation multicarrier optical fiber radio communication system of the present invention.
Fig. 8 is the eye pattern in the channel that carrier wave is 35GHz in a kind of automodulation multicarrier optical fiber radio communication system of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
It is a kind of flow chart of automodulation multicarrier optical fiber wireless communications method of the present invention referring to Fig. 1 to Fig. 8, Fig. 1；Fig. 2
It is a kind of schematic diagram of automodulation multicarrier optical fiber radio communication system of the present invention；Fig. 3 is a kind of automodulation multicarrier of the present invention
The schematic diagram of first wireless transport module of optical fiber radio communication system；Fig. 4 be a kind of automodulation multicarrier optical fiber of the present invention without
The schematic diagram of second wireless transport module of line communication system；Fig. 5 is a kind of automodulation multicarrier optical fiber radio communication of the present invention
The schematic diagram of the error rate test module of system；Fig. 6 is passed through in a kind of automodulation multicarrier optical fiber radio communication system of the present invention
Cross the spectrogram of the millimeter-wave signal after electric bandpass filter；Fig. 7 is a kind of automodulation multicarrier optical fiber radio communication of the present invention
Carrier wave is the eye pattern in the channel of 30GHz in system；Fig. 8 is carried in a kind of automodulation multicarrier optical fiber radio communication system of the present invention
Wave is the eye pattern in the channel of 35GHz.
As shown in Figure 1, a kind of automodulation multicarrier optical fiber wireless communications method, includes the following steps：
S1. multiple mutually different binary digit baseband signals and multiple mutually different sinusoidal carrier signals are obtained, one
Binary digit baseband signal corresponds to a sinusoidal carrier signal；Specifically, binary digit base is generated by pseudo-random sequence
Band signal；
S2. mutual corresponding binary digit baseband signal and sinusoidal carrier signal are mixed, obtain MF Multi-Channel Per Carrier letter
Number；
S3. multiple paths of single-carrier signals is subjected to power combing, obtains multi-carrier signal；
S4. multi-carrier signal is modulated on light carrier, obtains light and carries millimeter-wave signal；
S5. millimeter-wave signal is carried to light and carries out beat frequency, obtain millimeter-wave signal；
S6. power amplification and wireless transmission or error rate test are carried out according to millimeter-wave signal.
Specifically, in the step S4, it is to contain each order frequency component and optical carrier component that the light, which carries millimeter-wave signal,
Light carry millimeter-wave signal, the step S4 further include to containing each order frequency component and optical carrier component light carry millimeter wave letter
It number is filtered, obtains carrying millimeter-wave signal containing only the light of positive fundamental frequency component and optical carrier component.
In the step S5, carrying millimeter-wave signal progress beat frequency to light is specially：It is carried according to the light of positive fundamental frequency component
The light of millimeter-wave signal and optical carrier component carries the difference on the frequency of millimeter-wave signal, obtains the millimeter wave that frequency is the difference on the frequency and believes
Number.
As shown in Fig. 2, accordingly, in a kind of automodulation multicarrier optical fiber radio communication system, including：
Multiple binary digit base band sources 11, for generating multiple mutually different binary digit baseband signals；
Multiple central station end sinusoidal carrier signals source 12, for generating multiple mutually different sinusoidal carrier signals, wherein one
Binary digit baseband signal corresponds to a sinusoidal carrier signal；
Multiple central station end frequency mixers 13, for carrying out mutual corresponding binary digit baseband signal and sinusoidal carrier signal
Mixing, obtains multiple paths of single-carrier signals；
One power combiner 14 obtains multi-carrier signal for multiple paths of single-carrier signals to be carried out power combing；
One semiconductor laser 15 obtains light and carries millimeter-wave signal for multi-carrier signal to be modulated to light carrier；
One photodetector 21 carries out beat frequency for carrying millimeter-wave signal to light, obtains millimeter-wave signal.
Specifically, it is to be carried containing each order frequency component and light that the light that the semiconductor laser 15 obtains, which carries millimeter-wave signal,
The light of wave component carries millimeter-wave signal；
The system also includes optical band pass filter 16, the optical band pass filter 16 is used for containing each order frequency component and light
The light of carrier component carries millimeter-wave signal and is filtered, and obtains carrying containing only the light of positive fundamental frequency component and optical carrier component
Millimeter-wave signal；
21 light of the photodetector carries millimeter-wave signal progress beat frequency：Millimeter is carried according to the light of positive fundamental frequency component
The light of wave signal and optical carrier component carries the difference on the frequency of millimeter-wave signal, obtains the millimeter-wave signal that frequency is the difference on the frequency.
Wherein, the running parameter of multiple binary digit base band sources 11 is different, and multiple central station end sines carry
The running parameter of wave signal source 12 is different, to obtain the mutually different signal after multichannel mixing, finally obtains multicarrier
Signal.
It should be noted that sinusoidal carrier signal is the carrier signal without carrying signal, and binary digit base band is believed
It is number then information.After mutual corresponding binary digit baseband signal and sinusoidal carrier signal are mixed, what is obtained is to carry
The multiple paths of single-carrier signals of information, and power combing is carried out to this multiple paths of single-carrier signals, what is obtained is the overloading for carrying information
Wave signal.Multi-carrier signal is modulated on light carrier, what is obtained is the light load millimeter-wave signal for carrying information, what beat frequency obtained
It is the millimeter-wave signal for carrying information.
Multi-carrier signal is modulated on light carrier and obtains light load millimeter-wave signal, to realize automodulation, with realization
The low advantage of complexity, reduces cost of implementation；Meanwhile multiple mutual corresponding binary digit baseband signals and sine being carried
Wave signal is mixed, then by obtaining multi-carrier signal after power combing, and simultaneous transmission multichannel is believed by way of multicarrier
Number, the capacity of communication is expanded, to improve the data volume of communication, optimizes communication efficiency.
Specifically, the first wireless communication mode and the second wireless transmission can be divided by carrying out wireless transmission according to millimeter-wave signal
Pattern.
First wireless communication mode specifically includes following steps：
Millimeter-wave signal is obtained to beat frequency and carries out bandpass filtering, obtains the multi-carrier signal after bandpass filtering；
Power amplification is carried out to multi-carrier signal；
The amplified multi-carrier signal of transmission power.
Accordingly, a kind of automodulation multicarrier optical fiber radio communication system further includes the first wireless transport module 22, is such as schemed
Shown in 3, first wireless transport module 22 includes：
One electric bandpass filter 25 carries out bandpass filtering, after obtaining bandpass filtering for obtaining millimeter-wave signal to beat frequency
Multi-carrier signal；
One power amplifier 26, for carrying out power amplification to multi-carrier signal；
One antenna is used for the amplified multi-carrier signal of transmission power.
On the one hand, can introduce interference signal during beat frequency, filtering beat frequency obtain millimeter-wave signal can effectively remove because
Beat frequency and the interference signal introduced, only retain multi-carrier signal；On the other hand, directly right to multi-carrier signal progress power amplification
After launch, terminal is subjected to multi-carrier signal, and different terminals can demodulate multi-carrier signal according to actual conditions.
Second wireless communication mode specifically includes following steps：
Power distribution is carried out to the millimeter-wave signal that beat frequency obtains, obtains the identical multi-carrier signal of multichannel；
Bandpass filtering treatment is carried out to the identical multi-carrier signal in each road respectively, obtains the different single load of multichannel centre frequency
Wave signal；
Each single-carrier signal is subjected to power amplification；
The amplified each single-carrier signal of transmission power.
Accordingly, a kind of automodulation multicarrier optical fiber radio communication system further includes the second wireless transport module 23, is such as schemed
Shown in 4, second wireless transport module 23 includes：
One power divider 27, the millimeter-wave signal for being obtained to beat frequency carry out power distribution, it is identical more to obtain multichannel
Carrier signal；
Multiple electricity bandpass filters 25, carry out bandpass filtering treatment to the identical multi-carrier signal in each road respectively, obtain in multichannel
The different single-carrier signal of frequency of heart；
Multiple power amplifiers 26, for each single-carrier signal to be carried out power amplification；
Mutiple antennas is used for the amplified each single-carrier signal of transmission power.
Wherein, the running parameter of multiple electric bandpass filters 25 is different, different to obtain multichannel centre frequency
Single-carrier signal.
Then launch difference with directly power amplification is carried out to multi-carrier signal, respectively to the identical multicarrier in each road
Signal carries out bandpass filtering treatment and obtains multiple paths of single-carrier signals, then each single-carrier signal is carried out power amplification and is then emitted
It goes out, can just be demodulated in base station 2 according to the actual conditions of terminal, mitigate the load of terminal.
In addition, carrying out error rate test according to millimeter-wave signal specifically includes following steps：
Millimeter-wave signal is obtained to beat frequency and carries out bandpass filtering, obtains the multi-carrier signal after bandpass filtering；
Power distribution is carried out to filtered multi-carrier signal, obtains the identical multi-carrier signal of multichannel；
It obtains and the mutually different sinusoidal carrier signal of multichannel；
Each road multi-carrier signal and sinusoidal carrier signal corresponding with each road multi-carrier signal are mixed, by each road multicarrier
Spectrum component corresponding to signal moves lower frequency region, obtains the multi-carrier signal after multichannel mixing；
Multi-carrier signal after being mixed respectively to each road carries out low-pass filtering treatment, obtains multiple binary digit baseband signals；
Error rate test is carried out according to multiple binary digit baseband signals.
Accordingly, a kind of automodulation multicarrier optical fiber radio communication system, further includes error rate test module 24, such as Fig. 5
Shown, the error rate test module 24 includes：
One electric bandpass filter 25 carries out bandpass filtering, after obtaining bandpass filtering for obtaining millimeter-wave signal to beat frequency
Multi-carrier signal；
One power divider 27 obtains the identical overloading of multichannel for carrying out power distribution to filtered multi-carrier signal
Wave signal；
Multiple base station end sinusoidal carrier signals source 28, for generating the mutually different sinusoidal carrier signal of multichannel；
Multiple base station end frequency mixers 29, for respectively to each road multi-carrier signal and sinusoidal load corresponding with each road multi-carrier signal
Wave signal is mixed, and the spectrum component corresponding to each road multi-carrier signal is moved lower frequency region, after obtaining multichannel mixing
Multi-carrier signal；
Multiple electricity low-pass filters 30 carry out low-pass filtering treatment, demodulation for the multi-carrier signal after being mixed respectively to each road
Go out multiple mutually different binary digit baseband signals；
Multiple error rate testers 31, for carrying out error rate test according to the multiple binary digit baseband signals demodulated.
Wherein, the running parameter in multiple base station end sinusoidal carrier signals source 28 is different, multiple base station end frequency mixers 29
Running parameter it is different, to obtain mutually different multi-carrier signal, and then obtain multiple mutually different binary numbers
Word baseband signal.Multi-carrier signal after mixing is restored binary digit baseband signal, then carries out error rate test, it can
Easily assess communication quality.
The technical program is described in detail with reference to the function and operation principle of all parts.
A kind of automodulation multicarrier optical fiber radio communication system, including central station 1 and base station 2.
In central station 1, binary digit baseband signal that multiple pseudo-random sequences are generated respectively with it is multiple and different
Sinusoidal carrier signal is mixed, then this multiple paths of single-carrier signals power combing, utilizes the signal driving half after power combing
Multichannel millimeter-wave signal is loaded on light carrier by conductor laser 15 simultaneously to realize.Semiconductor laser 15 will produce
The light of raw double-side band carries millimeter-wave signal, i.e., what semiconductor laser 15 inputted is containing each order frequency component and optical carrier component
Light carry millimeter-wave signal.The light that semiconductor laser 15 inputs carries millimeter-wave signal and is carried out by an optical band pass filter 16
After being filtered, it is left to carry millimeter-wave signal containing only the light of positive fundamental frequency component and optical carrier component.Filtered light carries milli
Metric wave signal will be transmitted to base station 2 by optical fiber link.
In base station 2, then the light to receiving carries millimeter wave and carries out beat frequency by photodetector 21, and light is carried millimeter wave
Signal is converted to millimeter-wave signal.Base station 2 includes that the first wireless transport module 22, the second wireless transport module 23 and the bit error rate are surveyed
Die trial block 24.
Central station 1 includes：
Multiple binary digit base band sources 11, for generating multiple binary digit baseband signals；
Multiple central station end sinusoidal carrier signals source 12, for generating multiple sinusoidal carrier signals；
Multiple central station end frequency mixers 13, for carrying out mutual corresponding binary digit baseband signal and sinusoidal carrier signal
Mixing；
One power combiner 14, for multiple paths of single-carrier signals to be carried out power combing；
One semiconductor laser 15 obtains light and carries millimeter-wave signal for multi-carrier signal to be modulated to light carrier；
One optical band pass filter 16 is carried out for carrying millimeter-wave signal to the light containing each order frequency component and optical carrier component
It is filtered, obtains carrying millimeter-wave signal containing only the light of positive fundamental frequency component and optical carrier component.
Specifically, the semiconductor laser further includes a laser internal working power, the laser internal working power
Input terminal be connected with the output end of the power combiner, the output end of the laser internal working power and the semiconductor
The input terminal of laser is connected.
Multi-carrier signal is modulated on light carrier, light load millimeter-wave signal is obtained and specifically includes：According to multi-carrier signal
Current amplitude control output laser power.
Wherein, the multi-carrier signal of power combiner output is electric signal, and laser internal working power is believed according to multicarrier
Number current amplitude control output laser power, to realize automodulation function.
The course of work of central station 1 includes：By multiple central station end frequency mixers 13, multichannel binary digit base band is believed
It number is mixed respectively with different sinusoidal carrier signals.After mixing, multiple signals are carried out by a power combiner 14
It is added.Signal after being added is input to a semiconductor laser 15, and semiconductor laser 15 carries out automodulation and export to contain
The light of multiple carrier waves carries millimeter-wave signal.Signal is after optical band pass filter 16, to containing each order frequency component and light carrier
The light of component carries millimeter-wave signal and is filtered, and obtains carrying millimeter containing only the light of positive fundamental frequency component and optical carrier component
Wave signal is transmitted to base station 2 by optical fiber link.It is realized and is communicated by optical fiber link between central station 1 and base station 2, is i.e. light belt
The output end of bandpass filter 16 is connected by optical fiber link with the input terminal of photodetector 21.
Base station 2 first has to carry millimeter-wave signal progress beat frequency to light by photodetector 21, obtains millimeter-wave signal, so
By the first wireless transport module 22, either the second wireless transport module 23 carries out wireless transmission or is surveyed by the bit error rate again afterwards
It tries instrument 31 and error rate test is carried out to millimeter-wave signal.
First wireless transport module 22 includes：
One electric bandpass filter 25 carries out bandpass filtering, after obtaining bandpass filtering for obtaining millimeter-wave signal to beat frequency
Multi-carrier signal；
One power amplifier 26, for carrying out power amplification to multi-carrier signal；
One antenna is used for the amplified multi-carrier signal of transmission power.
Second wireless transport module 23 includes：
One power divider 27, the millimeter-wave signal for being obtained to beat frequency carry out power distribution, it is identical more to obtain multichannel
Carrier signal；
Multiple electricity bandpass filters 25, carry out bandpass filtering treatment to the identical multi-carrier signal in each road respectively, obtain in multichannel
The different single-carrier signal of frequency of heart；
Multiple power amplifiers 26, for each single-carrier signal to be carried out power amplification；
Mutiple antennas is used for the amplified each single-carrier signal of transmission power.
Error rate test module 24 includes：
One electric bandpass filter 25 carries out bandpass filtering, after obtaining bandpass filtering for obtaining millimeter-wave signal to beat frequency
Multi-carrier signal；
Multiple power dividers 27 obtain the identical overloading of multichannel for carrying out power distribution to filtered multi-carrier signal
Wave signal；
Multiple base station end sinusoidal carrier signals source 28, for generating the mutually different sinusoidal carrier signal of multichannel；
Multiple base station end frequency mixers 29, for respectively to each road multi-carrier signal and sinusoidal load corresponding with each road multi-carrier signal
Wave signal is mixed, and the spectrum component corresponding to each road multi-carrier signal is moved lower frequency region, after obtaining multichannel mixing
Multi-carrier signal；
Multiple electricity low-pass filters 30 carry out low-pass filtering treatment, demodulation for the multi-carrier signal after being mixed respectively to each road
Go out multiple binary digit baseband signals；
Multiple error rate testers 31, for carrying out error rate test according to the multiple binary digit baseband signals demodulated.
It should be noted that base station 2 is inner can be only arranged the first wireless transport module 22,23 and of the second wireless transport module
One in error rate test module 24, these three moulds any two in the block or three are may also set up, to meet difference
Application scenarios.
The technical program is illustrated below by embodiment.
Multiple binary digit base band sources 11 generate N number of binary digit baseband signal by pseudo-random sequence.At this
In embodiment, binary digit base band sources 11 are set as two, the bit rate of two binary digit base band sources 11
It is 2.5GHz.Certainly, two binary digit base band sources 11 or higher bit rate.
Multiple central station end sinusoidal carrier signals source 12, generates multiple and different sinusoidal carrier signals.In the present embodiment,
Central station end sinusoidal carrier signal source 12 is set as two, and frequency is respectively 30GHz and 35GHz.It is of course also possible to for higher or
Lower frequency.
Multiple central station end frequency mixers 13, for the binary digit baseband signal on each road sinusoidal carrier corresponding with its
Signal is mixed.In the present embodiment, there are two the settings of central station end frequency mixer 13.
Power combiner 14 is added for the signal after being mixed each road, one letter for containing multiple carrier waves of output
Number.In the present embodiment, power combiner 14 is that two-way input exports all the way.
Semiconductor laser 15 obtains light and carries millimeter-wave signal for multi-carrier signal to be modulated to light carrier.At this
In embodiment, the light carrier centre frequency of semiconductor laser 15 is 193.1THz.
Optical band pass filter 16, the signal for filtering the generation of semiconductor laser 15 make it be left positive fundamental frequency point
The light of amount and optical carrier component carries millimeter-wave signal.In the present embodiment, the centre frequency that optical band pass filter 16 uses for
193.1175THz, bandwidth 40GHz are left optical carrier component and 35GHz containing 30GHz after optical band pass filter 16
Positive fundamental frequency component light carry millimeter-wave signal.
Photodetector 21 carries out opto-electronic conversion for beat frequency, and the light received load millimeter-wave signal is converted into millimeter
Wave signal.
Electric bandpass filter 25, the millimeter-wave signal obtained for filtering beat frequency make its remaining millimeter wave containing only carrier wave
Signal.In the present embodiment, the centre frequency of electric bandpass filter 25 is 32.5GHz, bandwidth 10GHz, is filtered by electric band logical
Frequency spectrum after wave device 25 is as shown in Figure 6, it can be seen that carrier wave is respectively the millimeter-wave signal of 30GHz and 35GHz.
Power amplifier 26 carries out power amplification for the multi-carrier signal before emitting.
Antenna is launched for that will pass through 26 amplified multi-carrier signal of power amplifier.
Power divider 27 is exported for millimeter-wave signal to be divided into the identical signal of multichannel.In the present embodiment, power
Distributor 27 is input two-way output all the way.
Base station end sinusoidal carrier signal source 28, the sinusoidal carrier signal called for generating multiple and different solutions, frequency
It is corresponded with multiple central station end sinusoidal carrier signals source 12 and identical.In the present embodiment, base station end sinusoidal carrier signal
Source 28 is set as two, and frequency is respectively 30GHz and 35GHz, or it is higher and with 1 sinusoidal carrier signal source of central station
Corresponding frequency.
Base station end frequency mixer 29, for carrying out millimeter-wave signal sinusoidal carrier signal corresponding with its after opto-electronic conversion
Mixing, exports after making its down coversion.In the present embodiment, there are two the settings of base station end frequency mixer 29.
Multiple electricity low-pass filters 30, are used to filter the signal after mixing, its are made only to be left binary digit baseband signal,
I.e. after electric low-pass filter 30, it can modulate signals into out.In the present embodiment, i.e., electricity low-pass filter 30 is provided with
Two, cutoff frequency 2.5GHz.
Error rate tester 31, for analyzing the bit error rate per the binary digit baseband signal recovered all the way, from
And checking system performance.In the present embodiment, error rate tester 31 is set as two, respectively test carrier wave be 30GHz and
The bit error rate of the two-way carrier communication of 35GHz.
In the case that fiber lengths between central station 1 and base station 2 are 50km, the result of error rate tester 31 is shown
The two paths of signals bit error rate of different carrier waves 10-28 powers or so, carrier wave be 30GHz and 35GHz two paths of signals eye
Figure is as shown in Figure 7 and Figure 8 respectively.The functional of entire optical communication system is can be seen that from the bit error rate and eye pattern.
In conclusion the present invention provides a kind of automodulation multicarrier optical fiber wireless communications method and system, with existing skill
Art now compares, and the technical program, which is modulated to multi-carrier signal on light carrier, obtains light load millimeter-wave signal, to realize automodulation,
Have the advantages that implementation complexity is low, reduces cost of implementation；Meanwhile by multiple mutual corresponding binary digit baseband signals
It is mixed with sinusoidal carrier signal, then by obtaining multi-carrier signal after power combing, is passed simultaneously by way of multicarrier
Defeated multiple signals expand the capacity of communication, to improve the data volume of communication, optimize communication efficiency.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of automodulation multicarrier optical fiber wireless communications method, it is characterised in that：Include the following steps,
S1. multiple mutually different binary digit baseband signals and multiple mutually different sinusoidal carrier signals are obtained, one
Binary digit baseband signal corresponds to a sinusoidal carrier signal；
S2. mutual corresponding binary digit baseband signal and sinusoidal carrier signal are mixed, obtain MF Multi-Channel Per Carrier letter
Number；
S3. multiple paths of single-carrier signals is subjected to power combing, obtains multi-carrier signal；
S4. multi-carrier signal is modulated on light carrier, obtains light and carries millimeter-wave signal；
S5. millimeter-wave signal is carried to light and carries out beat frequency, obtain millimeter-wave signal.
2. a kind of automodulation multicarrier optical fiber wireless communications method according to claim 1, it is characterised in that：
In the step S4, it is to carry millimeter wave containing the light of each order frequency component and optical carrier component that the light, which carries millimeter-wave signal,
Signal, the step S4 further include carrying millimeter-wave signal to the light containing each order frequency component and optical carrier component to be filtered place
Reason obtains carrying millimeter-wave signal containing only the light of positive fundamental frequency component and optical carrier component；
In the step S5, carrying millimeter-wave signal progress beat frequency to light is specially：Millimeter is carried according to the light of positive fundamental frequency component
The light of wave signal and optical carrier component carries the difference on the frequency of millimeter-wave signal, obtains the millimeter-wave signal that frequency is the difference on the frequency.
3. a kind of automodulation multicarrier optical fiber wireless communications method according to claim 1, it is characterised in that：In the step
Further include being wirelessly transferred according to millimeter-wave signal after rapid S5；
It includes the first wireless communication mode to carry out wireless transmission according to millimeter-wave signal, and first wireless communication mode specifically wraps
Include following steps：
Millimeter-wave signal is obtained to beat frequency and carries out bandpass filtering, obtains the multi-carrier signal after bandpass filtering；
Power amplification is carried out to multi-carrier signal；
The amplified multi-carrier signal of transmission power.
4. a kind of automodulation multicarrier optical fiber wireless communications method according to claim 3, it is characterised in that：According to millimeter
It further includes the second wireless communication mode that wave signal, which carries out wireless transmission, and second wireless communication mode specifically includes following step
Suddenly：
Power distribution is carried out to the millimeter-wave signal that beat frequency obtains, obtains the identical multi-carrier signal of multichannel；
Bandpass filtering treatment is carried out to the identical multi-carrier signal in each road respectively, obtains the different single load of multichannel centre frequency
Wave signal；
Each single-carrier signal is subjected to power amplification；
The amplified each single-carrier signal of transmission power.
5. a kind of automodulation multicarrier optical fiber wireless communications method according to claim 1, it is characterised in that：In the step
Further include that error rate test is carried out according to millimeter-wave signal after rapid S5；
Error rate test, which is carried out, according to millimeter-wave signal specifically includes following steps：
Millimeter-wave signal is obtained to beat frequency and carries out bandpass filtering, obtains the multi-carrier signal after bandpass filtering；
Power distribution is carried out to the multi-carrier signal after bandpass filtering, obtains the identical multi-carrier signal of multichannel；
Obtain the mutually different sinusoidal carrier signal of multichannel；
Each road multi-carrier signal and sinusoidal carrier signal corresponding with each road multi-carrier signal are mixed, by each road multicarrier
Spectrum component corresponding to signal moves lower frequency region, obtains the multi-carrier signal after multichannel mixing；
Multi-carrier signal after being mixed respectively to each road carries out low-pass filtering treatment, obtains multiple binary digit baseband signals；
Error rate test is carried out according to multiple binary digit baseband signals.
6. a kind of automodulation multicarrier optical fiber radio communication system, it is characterised in that：Including,
Multiple binary digit base band sources, for generating multiple mutually different binary digit baseband signals；
Multiple central station end sinusoidal carrier signals source, for generating multiple mutually different sinusoidal carrier signals, wherein one two
Binary digits baseband signal corresponds to a sinusoidal carrier signal；
Multiple central station end frequency mixers, for mixing mutual corresponding binary digit baseband signal and sinusoidal carrier signal
Frequently, multiple paths of single-carrier signals is obtained；
One power combiner obtains multi-carrier signal for multiple paths of single-carrier signals to be carried out power combing；
One semiconductor laser obtains light and carries millimeter-wave signal for multi-carrier signal to be modulated to light carrier；
One photodetector carries out beat frequency for carrying millimeter-wave signal to light, obtains millimeter-wave signal.
7. a kind of automodulation multicarrier optical fiber radio communication system according to claim 6, it is characterised in that：The light carries
Millimeter-wave signal is to carry millimeter-wave signal containing the light of each order frequency component and optical carrier component；
The system also includes an optical band pass filter, the optical band pass filter is used for containing each order frequency component and light
The light of carrier component carries millimeter-wave signal and is filtered, and obtains carrying containing only the light of positive fundamental frequency component and optical carrier component
Millimeter-wave signal；
The photodetector light carries millimeter-wave signal progress beat frequency：Millimeter wave is carried according to the light of positive fundamental frequency component
The light of signal and optical carrier component carries the difference on the frequency of millimeter-wave signal, obtains the millimeter-wave signal that frequency is the difference on the frequency.
8. a kind of automodulation multicarrier optical fiber radio communication system according to claim 6, it is characterised in that：Further include
One wireless transport module, first wireless transport module include：
One electric bandpass filter carries out bandpass filtering for obtaining millimeter-wave signal to beat frequency, obtains more after bandpass filtering
Carrier signal；
One power amplifier, for carrying out power amplification to multi-carrier signal；
One antenna is used for the amplified multi-carrier signal of transmission power.
9. a kind of automodulation multicarrier optical fiber radio communication system according to claim 8, it is characterised in that：Further include
Two wireless transport modules, second wireless transport module include：
One power divider, the millimeter-wave signal for being obtained to beat frequency carry out power distribution, obtain the identical overloading of multichannel
Wave signal；
Multiple electricity bandpass filters, carry out bandpass filtering treatment to the identical multi-carrier signal in each road respectively, obtain multichannel center
The different single-carrier signal of frequency；
Multiple power amplifiers, for each single-carrier signal to be carried out power amplification；
Mutiple antennas is used for the amplified each single-carrier signal of transmission power.
10. a kind of automodulation multicarrier optical fiber radio communication system according to claim 6, it is characterised in that：Further include
Error rate test module, the error rate test module include：
One electric bandpass filter carries out bandpass filtering for obtaining millimeter-wave signal to beat frequency, obtains more after bandpass filtering
Carrier signal；
It is identical more to obtain multichannel for carrying out power distribution to the multi-carrier signal after bandpass filtering for one power divider
Carrier signal；
Multiple base station end sinusoidal carrier signals source, for generating the mutually different sinusoidal carrier signal of multichannel；
Multiple base station end frequency mixers, for respectively to each road multi-carrier signal and sinusoidal carrier corresponding with each road multi-carrier signal
Signal is mixed, and the spectrum component corresponding to each road multi-carrier signal is moved lower frequency region, is obtained more after multichannel mixing
Carrier signal；
Multiple electricity low-pass filters carry out low-pass filtering treatment for the multi-carrier signal after being mixed respectively to each road, demodulate
Multiple binary digit baseband signals；
One error rate tester, for carrying out error rate test according to the multiple binary digit baseband signals demodulated.
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