CN106878227A - One kind improves three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system and method - Google Patents
One kind improves three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system and method Download PDFInfo
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
- H04L27/263—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators modification of IFFT/IDFT modulator for performance improvement
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- H04L27/26—Systems using multi-frequency codes
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Abstract
Three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system, including radiofrequency launcher and optical signal converter are improved the invention discloses one kind, radiofrequency launcher connects the optical signal converter.Radiofrequency launcher includes serioparallel exchange module, binary sequence is input into serioparallel exchange module, serioparallel exchange module connection three dimensional signal mapping and recombination module, three dimensional signal mapping is connected two-dimentional inversefouriertransform module with recombination module, two-dimentional inversefouriertransform module connection parallel-serial conversion inserts module with Cyclic Prefix, parallel-serial conversion and Cyclic Prefix insertion module output end are connected on one D/A converter module and once D/A converter module, the upper upper low pass filter of D/A converter module connection, the lower lower low pass filter of D/A converter module connection, upper low pass filter and lower first low pass filter output are all connected with optical signal converter.Three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method is improved present invention additionally comprises one kind, band efficiency, the validity of strengthening system is improved.
Description
Technical field
The present invention relates to optical communication field, more particularly to a kind of three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate of raising
System and method.
Background technology
In optical communication field, coherent light OFDM (OFDM) technology is widely used for the Optical Fiber Transmission of long range
System, the advantage such as capacity is big, the availability of frequency spectrum is high, effective resisting chromatic dispersion that it has.But this technology is being mapped based on three dimensional signal
, it is necessary to represent a sub-carrier signal with three dimensional vectors in relevant optical OFDM system, each of which subcarrier components are real
Number form formula, is the three-dimensional coherent light ofdm signal of N for a sub-carrier number, after two-dimentional inversefouriertransform is modulated, often
Individual subcarrier components are changed into the plural form of time domain from the real number form of frequency domain, and the complex data for resulting in the need for sending reaches 3N,
Within a same light ofdm signal cycle, with sub-carrier number increase, it is necessary to bandwidth also will therewith become big, reduce
Band efficiency.
The content of the invention
In view of this, three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate is improved The embodiment provides one kind
System and method.
Three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system is improved The embodiment provides one kind, including
Radiofrequency launcher and optical signal converter, the radiofrequency launcher connect the optical signal converter, the radiofrequency launcher bag
Include serioparallel exchange module, three dimensional signal mapping and recombination module, two-dimentional inversefouriertransform module, parallel-serial conversion and Cyclic Prefix
Insertion module, upper D/A converter module, lower D/A converter module, upper low pass filter and lower low pass filter, the binary system
Sequence data is input into serioparallel exchange module, and is grouped through serioparallel exchange module, if per kilo byte for one group used as subcarrier
Index signal, serioparallel exchange module connection three dimensional signal mapping and recombination module, the serioparallel exchange module is by subcarrier
Index signal is exported to three dimensional signal mapping and recombination module, and the sub-carrier indices signal maps and weight through the three dimensional signal
After group resume module, the subcarrier components of each light orthogonal frequency-division multiplex singal are reduced to 2N, the three dimensional signal mapping by 3N
Two-dimentional inversefouriertransform module is connected with recombination module, two-dimentional inversefouriertransform module connects parallel-serial conversion and Cyclic Prefix
Insertion module, the two-dimentional inversefouriertransform module by frequency domain modulation to time domain, then passes through light orthogonal frequency-division multiplex singal
Each complex number components of time domain light orthogonal frequency-division multiplex singal are divided into real part by parallel-serial conversion with Cyclic Prefix insertion module
And the imaginary part corresponding with real part, the output end that the parallel-serial conversion inserts module with Cyclic Prefix is connected on one several
Mould modular converter and once D/A converter module, the upper upper low pass filter of D/A converter module connection, the lower digital-to-analogue turn
The output end of the lower low pass filter of mold changing block connection, the upper low pass filter and lower low pass filter is all connected with optical signal conversion
Device, the real part input optical signal converter, the imaginary number after upper D/A converter module and the treatment of upper low pass filter
Part input optical signal converter after lower D/A converter module and the treatment of lower low pass filter, and it is complete in optical signal converter
Into conversion from radio frequency to optical signal.
Further, the optical signal converter connection optical fiber link, the optical signal is transmitted by optical fiber link.
Further, the optical signal converter is optics I/Q modulators.
Further, the optical signal converter includes that top set's Mach-Zehnder modulator and inferior division Mach-Zehnder are modulated
Device, a laser diode and a phase shifter, top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator are equal
Connection laser diode, the upper low pass filter of top set's Mach-Zehnder modulator connection, inferior division Mach-Zehnder modulator connects
Lower low pass filter is connect, top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator believe the radio frequency of input
Optical signal number is converted to, the laser diode is that top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator are carried
For light source, the phase shifter by the phase of output signal phase shift pi/2 of inferior division Mach-Zehnder modulator, make top set Mach-once
The output signal of moral modulator and inferior division Mach-Zehnder modulator is orthogonal, and is superimposed output.
One kind improves three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method, comprises the following steps：
(1) by binary sequence input radio frequency transmitter, the binary sequence is in radiofrequency launcher through serioparallel exchange
Module is grouped, per k=log2For one group used as sub-carrier indices signal, M represents the chi of mapping planisphere used to M-bit
It is very little；
(2) three dimensional signal mapping is mapped the sub-carrier indices signal that step (1) is obtained with recombination module, and will be reflected
Frequency domain light orthogonal frequency-division multiplex singal after penetrating is recombinated, and the frequency domain light orthogonal frequency-division multiplex singal after restructuring has 2N plural number
Form subcarrier components；
(3) the frequency domain light OFDM signal modulating that two-dimentional inversefouriertransform module obtains step (2) is then
Domain, then by parallel-serial conversion and Cyclic Prefix insert module by the complex signal of time domain be divided into real part and with real part split-phase
Corresponding imaginary part；
(4) real part for obtaining step (3) the upper D/A converter module corresponding with imaginary part input and lower number
Mould modular converter, after being changed through upper D/A converter module and lower D/A converter module, then input goes up low pass filter with respectively
Low pass filter, after being processed through upper low pass filter and lower low pass filter, input optical signal converter, and in optical signal conversion
Conversion of the radio frequency to optical signal is completed in device；
(5) optical signal that step (4) is obtained is transmitted by optical fiber link.
Further, in the three dimensional signal mapping process of the step (2), frequency domain light orthogonal frequency-division multiplex singal is expressed as：
In formula：Sm=(Xm Ym Zm)T, 0≤m≤M-1 represents two-dimensional matrix S3×NIn each column vector, it represents one
Three dimensional signal, X, Y, Z represent coordinate of the signal in three dimensional signal planisphere, and T represents transposition.
Further, in the step (2), the frequency domain light orthogonal frequency-division multiplex singal after restructuring is expressed as：
In formula：
Compared with prior art, the invention has the advantages that：Each the time-domain coherence light OFDM for sending will be needed
Signal complex data is reduced to 2N by 3N, and original 2/3 times of bandwidth is only needed under the conditions of certain rate of information throughput is ensured
Resource, substantially increases band efficiency, enhances the validity of system.In receiving terminal, recombinated using a simple solution
Journey.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram for improving three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system of the present invention.
Fig. 2 is a kind of flow chart for improving three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is further described.
Fig. 1 is refer to, improving three-dimensional coherent light orthogonal division multiplexing frequency band The embodiment provides one kind utilizes
Rate system, including radiofrequency launcher 1 and optical signal converter 2, the connection optical signal converter 2 of radiofrequency launcher 1, optical signal conversion
Device 2 connects optical fiber link 3.
Radiofrequency launcher 1 includes that the mapping of serioparallel exchange module 11, three dimensional signal becomes with recombination module 12, two-dimentional anti-Fourier
It is mold changing block 13, parallel-serial conversion and Cyclic Prefix insertion module 14, upper D/A converter module 15, lower D/A converter module 16, upper low
Bandpass filter 17 and lower low pass filter 18, the connection three dimensional signal mapping of serioparallel exchange module 11 and recombination module 12, three-dimensional letter
Number mapping is connected two-dimentional inversefouriertransform module 13 with recombination module 12, and two-dimentional inversefouriertransform module 13 is connected and gone here and there turn
Change and insert module 14 with Cyclic Prefix, parallel-serial conversion is connected digital-to-analogue on and turns respectively with the output end of Cyclic Prefix insertion module 14
Mold changing block 15 and once D/A converter module 16, the upper low pass filter 17 of the connection of upper D/A converter module 15, lower digital-to-analogue conversion mould
The output end of the lower low pass filter 18 of the connection of block 16, upper low pass filter 17 and lower low pass filter 18 is all connected with optical signal conversion
Device 2.
Binary sequence data input serioparallel exchange module 11, and it is converted to every group of k bit through serioparallel exchange module 11
Sub-carrier indices signal, serioparallel exchange module 11 by sub-carrier indices signal output to three dimensional signal map and recombination module
12, after being processed with recombination module 12 through three dimensional signal mapping, frequency domain light ofdm signal is by original 3N sub- carrier signal components
Be changed into 2N sub- carrier signal components, two-dimentional inversefouriertransform module 13 by light ofdm signal by frequency domain modulation to time domain, then
By parallel-serial conversion and Cyclic Prefix insert module 14 by the light ofdm signal of time domain plural form be divided into real part and with reality
The corresponding imaginary part in number part, real part input light after upper D/A converter module 15 and the treatment of upper low pass filter 17
Signal adapter 2, imaginary part input optical signal converter after lower D/A converter module 16 and the treatment of lower low pass filter 18
2, and conversion of the radiofrequency signal to optical signal is completed in optical signal converter 2, optical signal is transmitted by optical fiber link 3.
Optical signal converter 2 is optics I/Q modulators, and in embodiment one, optical signal converter 2 includes top set horse
Conspicuous-zehnder modulators (MZM) 24 and inferior division Mach-Zehnder modulator 21 are all connected with laser diode 23, and top set's Mach-once
The upper low pass filter 17 of the connection of moral modulator 24, the connection of inferior division Mach-Zehnder modulator 21 lower low pass filter 18, top set
The radiofrequency signal of input is converted to optical signal, laser two by Mach-Zehnder modulator 24 and inferior division Mach-Zehnder modulator 21
Pole pipe 23 is top set's Mach-Zehnder modulator 24 and inferior division Mach-Zehnder modulator 21 provides light source, and phase shifter 22 is by under
The phase of output signal phase shift pi/2 of branch's Mach-Zehnder modulator 21, makes top set's Mach-Zehnder modulator 24 and inferior division
The output signal of Mach-Zehnder modulator 21 is orthogonal, and is superimposed output.
Fig. 2 is refer to, one kind improves three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method, comprises the following steps：
(1) by binary sequence input radio frequency transmitter 1, the binary sequence through going here and there and turns in radiofrequency launcher 1
Mold changing block 11 is grouped, per k bits for one group used as sub-carrier indices signal.
(2) the sub-carrier indices signal that step (1) is obtained is carried out three dimensional signal by three dimensional signal mapping with recombination module 12
Mapping, the frequency domain light ofdm signal after mapping is expressed as：
In formula：Sm=(Xm Ym Zm)T, 0≤m≤M-1 represents two-dimensional matrix S3×NIn each column vector, its represent one
Three dimensional signal, then the frequency domain light ofdm signal after mapping is carried out into subcarrier components restructuring, the frequency domain light ofdm signal after restructuring
There are the 2N subcarrier components of plural form, the frequency domain light ofdm signal after restructuring is expressed as：
In formula：
(3) the light ofdm signal that two-dimentional inversefouriertransform module 13 obtains step (2) is by frequency domain modulation to time domain, then
By parallel-serial conversion and Cyclic Prefix insert module 14 by the time domain light ofdm signal of plural form be divided into real part and with reality
The corresponding imaginary part in number part；
(4) real part for obtaining step (3) the upper D/A converter module 15 corresponding with imaginary part input is with
D/A converter module 16, after being changed through upper D/A converter module 15 and lower D/A converter module 16, then is input into upper low pass filtered respectively
Ripple device 17 and lower low pass filter 18, after being processed through upper low pass filter 17 and lower low pass filter 18, input optical signal conversion
Device 2, and complete in the optical signal converter 2 from conversion from radio frequency to optical signal；
(5) optical signal that step (4) is obtained is transmitted by optical fiber link.
Each time domain three-dimensional coherent light ofdm signal complex data that the present invention will send is reduced to 2N by 3N, is ensureing
Original 2/3 times of bandwidth resources are only needed under the conditions of certain rate of information throughput, band efficiency is substantially increased, enhanced
The validity of system.In receiving terminal, using a simple solution regrouping process.
In the case where not conflicting, the feature in embodiment herein-above set forth and embodiment can be combined with each other.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (7)
1. it is a kind of to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system, it is characterised in that including radiofrequency launcher
And optical signal converter, the radiofrequency launcher connects the optical signal converter, and the radiofrequency launcher includes serioparallel exchange
Module, three dimensional signal mapping and recombination module, two-dimentional inversefouriertransform module, parallel-serial conversion and Cyclic Prefix insertion module,
Upper D/A converter module, lower D/A converter module, upper low pass filter and lower low pass filter, the binary sequence data are defeated
Enter serioparallel exchange module, and be grouped through serioparallel exchange module, if per kilo byte for one group used as sub-carrier indices signal, institute
Serioparallel exchange module connection three dimensional signal mapping and recombination module are stated, the serioparallel exchange module is by sub-carrier indices signal output
To three dimensional signal mapping and recombination module, the sub-carrier indices signal is processed through three dimensional signal mapping and recombination module
Afterwards, the subcarrier components of each light orthogonal frequency-division multiplex singal are reduced to 2N by 3N, and N represents the son load of orthogonal frequency-division multiplex singal
Wave number, the three dimensional signal mapping is connected two-dimentional inversefouriertransform module, the two-dimentional inversefouriertransform with recombination module
Module connects parallel-serial conversion and inserts module with Cyclic Prefix, and the two-dimentional inversefouriertransform module believes light OFDM
Number by frequency domain modulation to time domain, then module is inserted by time domain light orthogonal frequency-division multiplex singal by parallel-serial conversion and Cyclic Prefix
Each complex number components is divided into real part and the imaginary part corresponding with real part, and the parallel-serial conversion is inserted with Cyclic Prefix
Enter D/A converter module and once D/A converter module in the output end connection one of module, the upper D/A converter module is connected
Low pass filter, lower D/A converter module connection lower low pass filter, the upper low pass filter and the lower low pass filter
Output end be all connected with optical signal converter, the real part is defeated after being processed through upper D/A converter module and upper low pass filter
Optical signal converter, input optical signal is changed after the imaginary part is processed through lower D/A converter module and lower low pass filter
Device, and conversion of the radio frequency to optical signal is completed in optical signal converter.
It is 2. according to claim 1 to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system, it is characterised in that
The optical signal converter connects optical fiber link, and the optical signal is transmitted by optical fiber link.
It is 3. according to claim 1 to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system, it is characterised in that
The optical signal converter is optics I/Q modulators.
It is 4. according to claim 1 to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate system, it is characterised in that
The optical signal converter includes top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator, the pole of laser two
Pipe and a phase shifter, top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator are all connected with laser diode,
The upper low pass filter of top set's Mach-Zehnder modulator connection, the lower low pass filter of inferior division Mach-Zehnder modulator connection,
The radiofrequency signal of input is converted to optical signal by top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator,
The laser diode provides light source, the phase shift for top set's Mach-Zehnder modulator and inferior division Mach-Zehnder modulator
The phase of output signal phase shift pi/2 of inferior division Mach-Zehnder modulator is made top set's Mach-Zehnder modulator and lower point by device
The output signal of branch Mach-Zehnder modulator is orthogonal, and is superimposed output.
5. it is a kind of to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method, it is characterised in that to comprise the following steps：
(1) by binary sequence input radio frequency transmitter, the binary sequence is in radiofrequency launcher through serioparallel exchange module
It is grouped, per k=log2For one group used as sub-carrier indices signal, M represents the size of mapping planisphere used to M-bit；
(2) three dimensional signal mapping is mapped the sub-carrier indices signal that step (1) is obtained with recombination module, and by after mapping
Frequency domain light orthogonal frequency-division multiplex singal recombinated, the frequency domain light orthogonal frequency-division multiplex singal after restructuring has 2N plural form
Subcarrier components；
(3) the frequency domain light OFDM signal modulating that two-dimentional inversefouriertransform module obtains step (2) is to time domain, then
Module is inserted by parallel-serial conversion and Cyclic Prefix the complex signal of time domain is divided into real part and corresponding with real part
Imaginary part；
(4) real part for obtaining step (3) the upper D/A converter module corresponding with imaginary part input and lower digital-to-analogue turn
Mold changing block, after being changed through upper D/A converter module and lower D/A converter module, then is input into upper low pass filter and lower low pass respectively
Wave filter, after being processed through upper low pass filter and lower low pass filter, input optical signal converter, and in optical signal converter
Complete conversion of the radio frequency to optical signal；
(5) optical signal that step (4) is obtained is transmitted by optical fiber link.
It is 6. according to claim 5 to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method, it is characterised in that
In the three dimensional signal mapping process of the step (2), frequency domain light orthogonal frequency-division multiplex singal is expressed as：
In formula：Sm=(Xm Ym Zm)T, 0≤m≤M-1 represents two-dimensional matrix S3×NIn each column vector, it represents a three-dimensional
Signal, X, Y, Z represent coordinate of the signal in three dimensional signal planisphere, and T represents transposition.
It is 7. according to claim 5 to improve three-dimensional coherent light orthogonal division multiplexing frequency band utilization rate method, it is characterised in that
In the step (2), the frequency domain light orthogonal frequency-division multiplex singal after restructuring is expressed as：
In formula：
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Cited By (1)
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| CN107948113A (en) * | 2017-11-10 | 2018-04-20 | 中国地质大学（武汉） | Being inserted into based on three dimensional signal reduces the method and system of ofdm system peak-to-average power ratio |
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