CN110492944A - A kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation - Google Patents
A kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation Download PDFInfo
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- CN110492944A CN110492944A CN201910886815.7A CN201910886815A CN110492944A CN 110492944 A CN110492944 A CN 110492944A CN 201910886815 A CN201910886815 A CN 201910886815A CN 110492944 A CN110492944 A CN 110492944A
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L27/2614—Peak power aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
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Abstract
A kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation of the present invention, comprising: for obtaining the data generating module of 16QAM digital signal；For obtaining the DFT spread spectrum module of Z digital baseband DFT-Spread-DMT signal；For Z digital baseband DFT-Spread-DMT signal to be carried out the HB-DFT-Spread-DMT signal modulation module based on Hilbert mono-edge belt transformation, to obtain the polygon band DFT-Spread-DMT signal of light；For receiving the polygon band DFT-Spread-DMT signal of light transmitted on single mode optical fiber, recovery obtains the HB-DFT-Spread-DMT signal modulation module of initial data.The present invention can be improved bandwidth efficiency and reduce the high PAPR of signal.
Description
Technical field
The present invention relates to the digital modulation techniques of fiber optic communication field, more particularly to one kind to be based on Hilbert transform (HB)
Single sideband modulation (SSB) discrete multitone optical communication system.
Background technique
Growth with user to transmission demand, fiber optic communication become logical as a kind of long range, high capacity transmission mode
The Main way of letter.Discrete multitone light modulation (ODMT) technology is by traditional discrete multi-tone modulation technology (DMT) and fiber optic communication
Technology combines, and has both the advantages of DMT high-peed connection, information capacity are big and optical fiber transmits good resisting chromatic dispersion, polarization mode dispersion,
There is vast application prospect.
Quadrature amplitude modulation (QAM) passes through the combined modulation of phase and amplitude, can obtain higher spectrum efficiency.Commonly
The planisphere of QAM be distributed in rectangular mesh, count in planisphere more, the information content of each symbol transmission is bigger, but same
When constellation point between spacing become smaller, to demodulating algorithm require the higher and bit error rate it is higher.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of based on Hilbert mono-edge belt transformation from
Multifrequency optical communication system is dissipated, can be improved bandwidth efficiency and reduces the peak value average power ratio (PAPR) of signal.
To achieve the goals above, the technical scheme is that
A kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation, comprising:
Data generating module, for generating mlog216 pseudo-random binary bit stream PRBS are as original binary
Input signal carries out serioparallel exchange in numeric field and carries out 16QAM mapping to obtain m 16QAM numerical chracter, the 16QAM number
Word signal is expressed as { Xn, n=0,1 ..., m-1 }；
DFT spread spectrum module is used for 16QAM digital signal { Xn, n=0,1 ..., m-1 } become by P point quick Fourier
It changes and completes spread spectrum by M-N point subcarrier maps with after Q-P point zero padding operation；Fourier is carried out to Q subcarrier mapping signal
Inverse transformation, and in tail portion, addition accounts for the cyclic prefix of 1/8 sequence, then converts the signal into serial baseband DFT-Spread-DMT letter
Number, obtain Z digital baseband DFT-Spread-DMT signal；
HB-DFT-Spread-DMT signal modulation module, being used for will be in the digital baseband DFT-Spread-DMT signal
Z base band DFT-Spread-DMT signal first pass through based on after Hilbert mono-edge belt transformation, converted using D/A switch
At polygon band DFT-Spread-DMT signal is simulated, electro-optical conversion is carried out through light intensity modulator MZM and is modulated on light carrier, is obtained
To the polygon band DFT-Spread-DMT signal of light, it is sent into link transmission module and is transmitted with single mode optical fiber；
HB-DFT-Spread-DMT signal modulation module, for receiving the polygon band DFT-Spread-DMT signal of the light,
The polygon band DFT-Spread-DMT signal of light is converted to by the polygon band DFT-Spread-DMT signal of electricity, electricity using photoelectric detector
Polygon band DFT-Spread-DMT signal is transformed to the polygon band DFT-Spread-DMT signal of number by analog-digital converter, in number
The polygon band DFT-Spread-DMT signal of number is obtained Z base band DFT-Spread- through directly demodulation by word signal processing unit
Dmt signal, then restore to obtain mlog by Fast Fourier Transform (FFT) after serioparallel exchange216 original bit datas.
Preferably, by the 16QAM digital signal { Xn, n=0,1 ..., m-1 } pass through P point quick Fourier transformation FFT
Spread spectrum is completed by M-N point subcarrier maps with after Q-P point zero padding operation；It is inverse that Fourier is carried out to Q subcarrier mapping signal
IFFT is converted, is specifically included:
To the 16QAM digital signal { Xn, n=0,1 ..., m-1 } pass through what is generated after P point quick Fourier transformation FFT
Frequency domain sample data AkIt is expressed as follows:
To symbol { AkSubcarrier maps are carried out, obtain Ck', it is as follows:
Again by sequence Ck'The inverse transformation of Q point quick Fourier is carried out, as follows:
yn=IFFT { Ck', n=0,1 ..., Q-1.
Preferably, the Hilbert mono-edge belt transformation, specifically includes:
Dmt signal is modulated in orderWherein, ωm(m=1,2 ... ,+∞) indicate DMT letter
Number angular frequency, AmIndicate the amplitude of sinusoidal signal；T indicates the time；Carrier wave c (t)=cos ωcT, wherein ωcIndicate carrier wave
Angular frequency, then the multi-carrier modulation of DMT signal of the carrierless amplitude phase modulation based on double sideband modulation indicates are as follows:
It is realized by Hilbert transformReserved
Upper side band or lower sideband are expressed as HB-SSB-DMT, as follows:
Wherein, SSSB(t) signal after the single sideband modulation based on Hilbert transform is indicated；It is m (t) warp
Cross what Hilbert transform obtained.
Beneficial effects of the present invention are as follows:
A kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation of the present invention, in order to obtain higher quality
Signal and so that demodulating algorithm is had more universality, using the multiband discrete Fourier transform based on Hilbert mono-edge belt transformation
(DFT-Spread) discrete multitone (DMT) signal is spread, improves the bandwidth efficiency of network, and restrained effectively peak value
The formation probability of signal, to significantly reduce the high PAPR of dmt signal.
Invention is further described in detail with reference to the accompanying drawings and embodiments, but one kind of the invention is based on Martin Hilb
The discrete multitone optical communication system of special mono-edge belt transformation is not limited to the embodiment.
Detailed description of the invention
Fig. 1 is the system block diagram of present example；
Fig. 2 is the transmitting terminal block diagram of the embodiment of the present invention；
Fig. 3 is the receiving end block diagram of the embodiment of the present invention；
Fig. 4 is the functional block diagram for the Hilbert mono-edge belt transformation that present example uses；Wherein, (a) indicates single-side belt
Modulation and the process that polygon band is formed by CAP；(b) it indicates double sideband modulation and forms the process of polygon band by CAP；LSB
Indicate that lower sideband, USB indicate upper side band.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
It is shown in Figure 1, a kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation, comprising:
Data generating module 10, for generating mlog216 pseudo-random binary bit stream PRBS as original two into
Input signal processed carries out serioparallel exchange in numeric field and carries out 16QAM mapping to obtain m 16QAM numerical chracter, the 16QAM
Digital signal { Xn, n=0,1 ..., m-1 } it indicates；
DFT spread spectrum module 20 is used for 16QAM digital signal { Xn, n=0,1 ..., m-1 } pass through P point FFT and Q-P point
Spread spectrum is completed by M-N point subcarrier maps after zero padding operation；IFFT is carried out to Q subcarrier mapping signal, and is added in tail portion
Add the CP for accounting for 1/8 sequence, then convert the signal into serial baseband DFT-Spread-DMT signal, obtains Z digital baseband DFT-
Spread-DMT signal；
HB-DFT-Spread-DMT signal modulation module 30 is used for the digital baseband DFT-Spread-DMT signal
In Z base band DFT-Spread-DMT signal first pass through based on after Hilbert mono-edge belt transformation, be converted into mould using DAC
Intend polygon band DFT-Spread-DMT signal, carries out E/O through light intensity modulator and be modulated on light carrier, obtain the polygon band of light
DFT-Spread-DMT signal is sent into link transmission module and is transmitted with single mode optical fiber；
HB-DFT-Spread-DMT signal modulation module 40, for receiving the polygon band DFT-Spread-DMT letter of the light
Number, the polygon band DFT-Spread-DMT signal of light is converted to by the polygon band DFT-Spread-DMT signal of electricity using PD, electricity is polygon
Band DFT-Spread-DMT signal is transformed to the polygon band DFT-Spread-DMT signal of number by ADC, in DSP that number is polygon
Band DFT-Spread-DMT signal obtains Z base band DFT-Spread-DMT signal through directly demodulation, then passes through after serioparallel exchange
Fast Fourier Transform (FFT) is crossed to restore to obtain mlog216 original bit datas.
Other hand according to the present invention, a kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation
Implementation method includes:
Step 1) is shown in Figure 2, and data generating module generates mlog216 pseudo-random binary bit streams
(PRBS), by the mlog216 point data amounts modulate to obtain a m QAM vector signal by 16QAM mapping block；It will be upper
It states after m QAM vector signal serial/parallel conversion after DFT spread spectrum module carries out P point FFT and subcarrier maps, then adds
CP, and convert the signal into serial baseband DFT-Spread-DMT signal；It repeats the above process, obtains Z serial baseband DFT-
Spread-DMT signal.The Z serial baseband DFT-Spread-DMT signal is passed through into dmt signal modulation module, passes through base
Polygon band DFT-Spread-DMT signal is obtained in Hilbert mono-edge belt transformation module；By the polygon band DFT-Spread-
Dmt signal digital-to-analogue conversion is at the polygon band DFT-Spread-DMT signal of simulation；By the polygon band DFT-Spread-DMT of simulation
HB-DMT signal is obtained in signal modulation to light carrier, and is transferred on optical fiber；By the polygon band DFT- on the optical fiber
Spread-DMT signal is using PD light-to-current inversion at the polygon band DFT-Spread-DMT signal of electricity；Then centralized mapping side is used
DFT output data is loaded on continuous subcarrier by case, and remaining sub-carriers are set as zero-zero padding.Using centralized mapping
Scheme can reduce the papr of dmt signal.
Dmt signal is made of multiple independent orthogonal subcarriers, shares Q subcarrier, and the sub-carrier number for carrying data is P,
The carrier number at the adjacent sub-carrier interval without carrying data is W, therefore Q=P+W.{Ak, k=0,1 ..., N-1 } indicate original defeated
Enter data { Xn, n=0,1 ..., m-1 } and sampled data after FFT, then sampled data is obtained carrying out subcarrier maps
{Ck, k=0,1 ..., N-1 }, DFT-Spread-DMT signal is obtained finally by IFFT.By Z base band DFT-Spread-DMT
Signal is first passed through based on polygon band DFT-Spread-DMT signal is obtained after Hilbert mono-edge belt transformation module, using DAC
It is converted into simulating polygon band DFT-Spread-DMT signal and carries out E/O through light intensity modulator and be modulated on light carrier, obtain light
Polygon band DFT-Spread-DMT signal.
Shown in Figure 4, order modulation dmt signal isWherein, ωm(m=1,2 ... ,+
∞) indicate the angular frequency of dmt signal, AmIndicate the amplitude of sinusoidal signal；T indicates the time；Carrier wave c (t)=cos ωcT, wherein
ωcIndicate the angular frequency of carrier wave, then the multi-carrier modulation of DMT signal of the carrierless amplitude phase modulation based on double sideband modulation indicates
Are as follows:
It is realized by Hilbert transformReserved
Upper side band or lower sideband are expressed as HB-SSB-DMT, as follows:
Wherein, SSSB(t) signal after the single sideband modulation based on Hilbert transform is indicated；It is m (t) warp
Cross what Hilbert transform obtained.
The polygon band DFT-Spread-DMT signal of the above-mentioned light of step 2) is sent into 20km single mode optical fiber and completes signal transmission.
Step 3) is shown in Figure 3, and the dmt signal on the optical fiber is converted into simulating polygon band using PD optical electrical
DFT-Spread-DMT signal；Analog-to-digital conversion is at the polygon band DFT-Spread-DMT signal of number, by polygon band DFT-Spread-
Dmt signal carries out down coversion, resampling, then root raised cosine filter filtering removes cyclic prefix and successively carries out N point FFT and M
Point IFFT (M < N), by obtaining original PRBS input signal after de-mapping device.
The above is only a preferable embodiments in present example.But the present invention is not limited to above-mentioned embodiment party
Case, it is all by the present invention any equivalent change and modification done, generated function without departing from this programme range when,
It belongs to the scope of protection of the present invention.
Claims (3)
1. a kind of discrete multitone optical communication system based on Hilbert mono-edge belt transformation characterized by comprising
Data generating module, for generating mlog216 pseudo-random binary bit stream PRBS are inputted as original binary to be believed
Number, serioparallel exchange is carried out in numeric field and carries out 16QAM mapping obtaining m 16QAM numerical chracter, the 16QAM digital signal
It is expressed as { Xn, n=0,1 ..., m-1 }；
DFT spread spectrum module is used for 16QAM digital signal { Xn, n=0,1 ..., m-1 } it is converted by P point quick Fourier and Q-
Spread spectrum is completed by M-N point subcarrier maps after P point zero padding operation；Inverse Fourier transform is carried out to Q subcarrier mapping signal,
And in tail portion, addition accounts for the cyclic prefix of 1/8 sequence, then converts the signal into serial baseband DFT-Spread-DMT signal, obtains
Z digital baseband DFT-Spread-DMT signal；
HB-DFT-Spread-DMT signal modulation module, for the Z in the digital baseband DFT-Spread-DMT signal is a
Base band DFT-Spread-DMT signal is first passed through based on after Hilbert mono-edge belt transformation, is converted into mould using D/A switch
Intend polygon band DFT-Spread-DMT signal, carries out electro-optical conversion through light intensity modulator MZM and be modulated on light carrier, obtain light
Polygon band DFT-Spread-DMT signal is sent into link transmission module and is transmitted with single mode optical fiber；
HB-DFT-Spread-DMT signal modulation module is used for receiving the polygon band DFT-Spread-DMT signal of the light
The polygon band DFT-Spread-DMT signal of light is converted to the polygon band DFT-Spread-DMT signal of electricity by photoelectric detector, and electricity is polygon
Band DFT-Spread-DMT signal is transformed to the polygon band DFT-Spread-DMT signal of number by analog-digital converter, believes in number
The polygon band DFT-Spread-DMT signal of number is obtained Z base band DFT-Spread-DMT through directly demodulation by number processing unit to be believed
Number, then restore to obtain mlog by Fast Fourier Transform (FFT) after serioparallel exchange216 original bit datas.
2. the discrete multitone optical communication system according to claim 1 based on Hilbert mono-edge belt transformation, feature exist
In by the 16QAM digital signal { Xn, n=0,1 ..., m-1 } pass through P point quick Fourier transformation FFT and Q-P point zero padding behaviour
Spread spectrum is completed by M-N point subcarrier maps after work；Inverse Fourier transform IFFT is carried out to Q subcarrier mapping signal, specifically
Include:
To the 16QAM digital signal { Xn, n=0,1 ..., m-1 } pass through the frequency domain generated after P point quick Fourier transformation FFT
Sampled data AkIt is expressed as follows:
To symbol { AkSubcarrier maps are carried out, obtain Ck', it is as follows:
Again by sequence Ck'The inverse transformation of Q point quick Fourier is carried out, as follows:
yn=IFFT { Ck', n=0,1 ..., Q-1.
3. the discrete multitone optical communication system according to claim 1 based on Hilbert mono-edge belt transformation, feature exist
In the Hilbert mono-edge belt transformation specifically includes:
Dmt signal is modulated in orderWherein, ωm(m=1,2 ... ,+∞) indicates the angle of dmt signal
Frequency, AmIndicate the amplitude of sinusoidal signal；T indicates the time；Carrier wave c (t)=cos ωcT, wherein ωcIndicate the angular frequency of carrier wave,
Then the multi-carrier modulation of DMT signal of the carrierless amplitude phase modulation based on double sideband modulation indicates are as follows:
It is realized by Hilbert transformReserved top
Band or lower sideband are expressed as HB-SSB-DMT, as follows:
Wherein, SSSB(t) signal after the single sideband modulation based on Hilbert transform is indicated；It is m (t) by uncommon
What your Bert converted.
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| JP2000261406A (en) * | 1999-03-08 | 2000-09-22 | Mitsubishi Electric Corp | Communication equipment and its method |
| US20120087668A1 (en) * | 2009-06-15 | 2012-04-12 | Huawei Technologies Co., Ltd. | Method and device for generating and receiving oofdm signal, and wavelength-division multiplexing system |
| US20160112238A1 (en) * | 2014-10-17 | 2016-04-21 | Finisar Corporation | Partial discrete fourier transform-spread in an orthogonal frequency division multiplexing system |
| CN108965188A (en) * | 2018-06-27 | 2018-12-07 | 华侨大学 | The method and system of optical millimeter wave section ofdm signal PAPR are reduced using DFT spread spectrum |
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2019
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| JP2000261406A (en) * | 1999-03-08 | 2000-09-22 | Mitsubishi Electric Corp | Communication equipment and its method |
| US20120087668A1 (en) * | 2009-06-15 | 2012-04-12 | Huawei Technologies Co., Ltd. | Method and device for generating and receiving oofdm signal, and wavelength-division multiplexing system |
| US20160112238A1 (en) * | 2014-10-17 | 2016-04-21 | Finisar Corporation | Partial discrete fourier transform-spread in an orthogonal frequency division multiplexing system |
| CN108965188A (en) * | 2018-06-27 | 2018-12-07 | 华侨大学 | The method and system of optical millimeter wave section ofdm signal PAPR are reduced using DFT spread spectrum |
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| Title |
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| YOUXU ZENG ET AL: "A Novel CAP-WDM-PON Employing Multi-Band DFT-Spread DMT Signals Based on Optical Hilbert-Transformed SSB Modulation", 《IEEE ACESS》 * |
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Application publication date: 20191122 |