CN106533573A - Asymmetric twin single-sideband modulation/ demodulation method and system - Google Patents

Asymmetric twin single-sideband modulation/ demodulation method and system Download PDF

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CN106533573A
CN106533573A CN201610947691.5A CN201610947691A CN106533573A CN 106533573 A CN106533573 A CN 106533573A CN 201610947691 A CN201610947691 A CN 201610947691A CN 106533573 A CN106533573 A CN 106533573A
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band
sideband
conversion
signal
filtering
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CN106533573B (en
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张帆
朱逸萧
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Peking University
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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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/67—Optical arrangements in the receiver
    • H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
    • H04B10/675—Optical arrangements in the receiver for controlling the input optical signal for controlling the optical bandwidth of the input signal, e.g. spectral filtering
    • 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/697—Arrangements for reducing noise and distortion
    • H04B10/6971—Arrangements for reducing noise and distortion using equalisation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses an asymmetric twin single-sideband modulation/ demodulation method and system. A transmitting end of the system comprises transmitting end Nyquist filter modules, which are used for carrying filtering on a left sideband and a right sideband; up-conversion modules, which are used for carrying out up-conversion on the signals, after up-conversion, baud rate of one sideband of the left sideband and the right sideband being smaller than or equal to transmitting end device bandwidth, and baud rate of the other sideband being smaller than or equal to the result obtained after the transmitting end device bandwidth subtracts a guard interval; and Hilbert filter modules, which are used for carrying filtering on the signals obtained after processing of the up-conversion modules to obtain asymmetric twin single-sideband signals. A receiving end comprises optical filter modules, which are used for completely filtering the right sideband for the left sideband through optical filtering, and basically filtering the left sideband for the right sideband through optical filtering to ensure that the width of the residual left sideband is smaller than the guard interval; down-conversion modules, which are used for carrying out down-conversion on the signals; and receiving end Nyquist filter modules, which are used for carrying out Nyquist filtering on the signals.

Description

A kind of asymmetric twin single sideband modulation, demodulation method and system
Technical field
The invention belongs to optic communication transmission field, is related to a kind of transmitting terminal based on asymmetric twin single sideband modulation and modulates Method, is related to the receiving terminal demodulation method based on Nyquist matched filtering, and corresponding system.
Background technology
Direct detection optical communication system has low cost, low complex degree and the advantage being easily integrated, and is short-distance and medium-distance optical fiber The important solutions of telecommunication transmission system.With the increase of transmission range, two sidebands of double-sideband signal can experience difference Dispersion, latter two sideband for changing into the signal of telecommunication in receiving terminal photoelectric detector (PD) overlaps each other and power fading occurs Phenomenon.And single sideband modulation can avoid power fading phenomenon by removing a sideband in transmitting terminal.Further, in order to The bandwidth of transmitting terminal is made full use of, a kind of feasible program is on the sideband being removed to modulate another independent single sideband singal Become twin single-side belt.But remaining sideband can produce serious interchannel interference to another sideband after the filtering of receiving terminal light (ICI)。
At present, the method for eliminating mutual crosstalk between twin two sidebands of single-sideband system mainly has two kinds, and one kind is to connect Joint equalization is carried out in receiving end Digital Signal Processing (DSP), and another kind is to arrange symmetrical protection interval.Two methods can Effectively eliminate crosstalk.
1) joint equalization is carried out in receiving terminal Digital Signal Processing (DSP).This method requires that receiving terminal has a pair of identical Optical filter, photodetector (PD) and analog-digital converter (ADC) be used for receiving the information of two sidebands, and two-way respectively Time delay also require that it is identical.And carry out the amount of calculation that 2 × 2 joint equalizations have at least twice compared to two-way independence equilibrium. So such a process increases the computation complexity of requirement for hardware and system.
2) symmetrical protection interval is set.The symmetrical setting between carrier wave and signal of this method is as signal bandwidth Protection interval so that optical filter can thoroughly filter non-targeted sideband.Also, photodetector (PD) square-law is detected The signal for causing-signal beat frequency interference can fall in protection interval.The shortcoming of this scheme is the spectrum efficiency that can sacrifice half.
The content of the invention
The present invention provides a kind of asymmetric twin single sideband modulation, demodulation method, and the system for realizing the method, can On the premise of joint equalization is not carried out, the crosstalk between twin sideband is eliminated with protection interval smaller.
For achieving the above object, the present invention is adopted the following technical scheme that：
A kind of asymmetric twin single sideband modulation mode based on nyquist filtering, comprises the following steps：
The first step：The size of protection interval is determined according to optical filter edge slope.Required optical filter be it is general can Wave filter is dimmed, centre wavelength and pass band width are variable；
Second step：The baud rate of two sidebands is determined according to transmitting terminal bandwidth of a device.Afterwards two sidebands are carried out respectively Nyquist filtering to the left or to the right up-conversion (are in fact equivalent to from left to right, for convenience of description it is assumed hereinafter that high The sideband of baud rate up-conversion to the left, the sideband of low baud rate up-conversion to the right), carry out Hilbert filter after up-conversion respectively Ripple obtains single sideband singal；Left and right sideband obtains asymmetric twin single sideband singal after being added.
3rd step：Left and right sideband is received independently in receiving terminal.For left side band：The right is filtered completely by light filtering Band；For the right band：Left side band is substantially filtered out by light filtering, it is ensured that remaining left side bandwidth is less than protection interval.Afterwards Down coversion and Nyquist matched filtering is carried out in digital signal processing, thoroughly filters left side band.Light filtering can be by adjusting The centre wavelength of section optical filter and pass band width are realized.
Further, the signal of transmitting terminal carries out pretreatment into before communication channel, including the non-linear precompensation of manipulator, Dispersion pre-compensation or optical fiber Kerr nonlinearity precompensation.
Further, for receiving end signal eliminates photodetection using iterative algorithm in Digital Signal Processing (DSP) Signal-signal beat frequency that the detection of device (PD) square-law is produced is damaged.
Further, this asymmetric twin monolateral band structure is not limited to single laser instrument and produces produce by electrical domain up-conversion Raw spectrum structure, or multiple separate lasers modulate the spectrum structure of left and right sideband and light carrier resynthesis respectively.
Further, the baud rate of left side band is less than or equal to transmitting terminal bandwidth of a device, the baud rate of the right band less than etc. Deduct protection interval (equal sign all being taken when nyquist filtering rolloff-factor is 0) in transmitting terminal bandwidth of a device.Ensure left side band Transmitting terminal nyquist filter frequency spectrum without departing from transmitting terminal bandwidth of a device, the right band after the filtering less than transmitting end-apparatus Part bandwidth deducts protection interval.
A kind of twin single sideband modulation direct detection system based on nyquist filtering for realizing said method, including send out End and receiving terminal is penetrated,
The transmitting terminal includes：
Transmitting terminal nyquist filtering module, for ensureing to compress in the case that receiving terminal does not have intersymbol interference (ISI) Frequency spectrum is square to being close to, and improves the availability of frequency spectrum；
Up-converter module, connects transmitting terminal nyquist filtering module, for baseband signal is moved on to high frequency, prevents positive and negative Frequency component it is overlapping.
Hilbert filter module, connects up-converter module, for double-sideband signal is filtered into single sideband singal, afterwards will Signal is sent to communication channel；
The receiving terminal includes：
Optical filter module, for removing unwanted side information；
Signal-signal beat frequency interference compensation module, connects optical filter module, for thermal compensation signal-signal beat frequency interference (SSBI)；
Down conversion module, connects signal-signal beat frequency interference compensation module, for the electricity for receiving photodetector (PD) Signal frequency conversion is baseband signal；
Receiving terminal nyquist filtering module, connects down conversion module, for eliminating intersymbol interference (ISI), lifts noise Than removing the another side band crosstalk of remnants after light filtering.
Further, also include：
Transmitting terminal modulation module, for carrying out quadrature amplitude phase-modulation (QAM) format mapping to original binary sequence, And synchronous series and training sequence is inserted as frame structure targeting sequencing.
Transmitting terminal pretreatment module, for carrying out pretreatment to launching end signal, is then forwarded to communication channel.
Receiving terminal demodulation module, for carrying out optimum sampling point optimization, channel equalization to sequence after receiving terminal matched filtering, And adjudicate solution and recall to binary sequence.
Further, the pretreatment that the front end data processing module is carried out includes：Manipulator nonlinear compensation, dispersion are pre- Compensation, the compensation of optical fiber Kerr nonlinearity.
Compared with prior art, the positive effect of the present invention is：
The method of the invention in the case of twin single sideband modulated signal combines left and right sideband and only needs to stay Go out protection interval and the characteristics of Nyquist matched filtering can remove out-of-band interference, be designed to asymmetric twin single-side belt side Case.This scheme need not carry out joint equalization, it is possible to achieve the individual reception of left and right sideband, increased the flexibility ratio of system. Left and right side interband crosstalk can be completely eliminated in theory, can reach and leave the twin monolateral of symmetrical protection interval and take a message Number identical bit error rate performance.
Description of the drawings
Fig. 1 is at the digital signal based on the asymmetric twin single sideband modulation of nyquist filtering of the embodiment of the present invention The flow chart of reason method.
Fig. 2 is the signal spectrum structural representation of the embodiment of the present invention.
Fig. 3 is that the structure of the asymmetric twin single sideband modulation system based on nyquist filtering of the embodiment of the present invention is shown It is intended to.
Fig. 4 is the 400Gb/s signal 80km transmission experiment result schematic diagrams of the embodiment of the present invention.
Specific embodiment
Below by specific embodiments and the drawings, the present invention is described in further details.
It is specifically described with reference to enforcements of the algorithm flow Fig. 1 of the present embodiment to technical scheme, solid box in Fig. 1 Main contents of the shown part for the present invention program.
The first step：The size of protection interval is determined according to optical filter edge slope, it is assumed that negligible crosstalk threshold value For A dB, the edge slope of optical filter is γ dB/nm, then required protection interval size is：
Fgap=A/ γ GHz,
Wherein, the representative value of A is 500 for the representative value of 20, γ, so general protection interval is about 5GHz.Notice Here protection interval size is only determined by optical filter, unrelated with signal rate, and frequency spectrum cost is constant.
Second step：Carry out the nyquist filtering that rolloff-factor is α in transmitting terminal, it is therefore an objective to which signal spectrum is compressed into closely Seemingly square, general α ensures by taking 0.01.
Then baseband signal is distinguished into left and right up-conversion, it is assumed that left side band baseband signal is s1T (), baud rate are B1, the right Band baseband signal is s2T (), baud rate are B2.After up-conversion, signal is respectivelyWithThen in numeric field, up-conversion can be with It is expressed as：
Wherein, Re { } represents the operation for the treatment of excess syndrome portion, and Im { } is represented and taken imaginary part operation.k1Represent left side band up-conversion system Number, meets k1>0.5+ α/2, typically can use 0.51.k2The right band up-conversion multiple is represented, k is met2>Fgap/B2+0.5+α/2。
Then Hilbert filter is carried out respectively：
Wherein conj { } represents conjugate operation, and Hilbert { } represents hilbert filter.
Then two sideband signals are added, and direct current carrier component is added by adjusting manipulator bias point.Sending extremely Before communication channel, typically dispersion pre-compensation to be carried out to signal on frequency domain：
Spre(f)=S (f) exp (- β2Lω2/2),
Wherein, SpreF () is frequency domain data after precompensation, S (f) is to pre-compensate for front frequency domain data, β2For GVD Coefficient, L are fiber lengths, and ω is the angular frequency relative to carrier wave.
3rd step：Left and right sideband is received independently in receiving terminal.Light filtering is carried out first.For left side band：By light Filtering filters the right band completely and eliminates crosstalk；For the right band：Left side band is substantially filtered out by light filtering, it is ensured that the remaining left side Bandwidth is less than protection interval.
Then, in Digital Signal Processing (DSP) stage, thermal compensation signal-signal beat frequency interference first：
Wherein riT () represents left and right sideband reception signal respectively, λ is the carrier signal power that amplitude factor depends on signal Than (CSPR) and receiving power.This process can step up performance with successive ignition, and general 4 to 6 times substantially steady afterwards It is fixed.As the process is not related to judgement demodulation, therefore computation complexity is very low.
Then, down coversion is carried out respectively to left and right sideband signals：
Then, Nyquist matched filtering is carried out to signal after down coversion.It is for the reception of the right band, remaining Left side band crosstalk is completely outside Nyquist spectral, it is possible to thoroughly filtered.
Finally, receiving terminal demodulation is carried out, is optimized including optimum sampling point, linear equalization, adjudicated and demodulate.
Fig. 2 shows the spectrum structure of signal, comprising three ingredients, is from left to right followed successively by：Left side band, light are carried Ripple, the right band.The width of each sideband and spacing parameter are chosen and are given in previous step.
This spectrum structure is not limited to be produced by single laser instrument, it is also possible to produce three portions respectively by multiple laser instrument Point, then combined by photo-coupler.
Fig. 3 is the composition schematic diagram of the equalizing system based on channel estimation in frequency domain corresponding with said method, including transmitting End and receiving terminal.
Transmitting terminal includes：Transmitting terminal modulation module, for carrying out quadrature amplitude phase-modulation to original binary sequence (QAM) format mapping, and synchronous series and training sequence is inserted as frame structure targeting sequencing；Transmitting terminal nyquist filtering mould Block, connects transmitting terminal modulation module, for ensureing to compress in the case that receiving terminal does not have intersymbol interference (ISI) frequency spectrum to being close to It is square；Up-converter module, connects transmitting terminal nyquist filtering module, for baseband signal is moved on to high frequency, prevents positive and negative frequency Rate component it is overlapping；Hilbert filter module, connects up-converter module, for double-sideband signal is filtered into single sideband singal； Transmitting terminal pretreatment module, connects Hilbert filter module, for carrying out pretreatment to launching end signal, is then forwarded to lead to Letter channel.
Receiving terminal includes：Optical filter module, for removing unwanted side information；Cyclic Prefix/suffix removes mould Block, for removing the Cyclic Prefix/suffix in training sequence；Signal-signal beat frequency interference compensation module, connects optical filter mould Block, for thermal compensation signal-signal beat frequency interference (SSBI)；Down conversion module, connects signal-signal beat frequency interference compensation module, Signal of telecommunication frequency conversion for photodetector (PD) is received is baseband signal；Receiving terminal nyquist filtering module, under connection Frequency-variable module, for eliminating intersymbol interference (ISI), lifts signal to noise ratio, removes the another side band crosstalk of remnants after light filtering；Connect Receiving end demodulation module, connects receiving terminal nyquist filtering module, for most preferably being adopted to sequence after receiving terminal matched filtering Sampling point optimization, channel equalization, and adjudicate solution and recall to binary sequence.
Fig. 4 is 400Gb/s single channel transmission experiment results, and transmission range is 80 kilometers, launched power of the transverse axis for signal. Two sidebands have essentially identical optimum launched power and similar bit error rate performance, illustrate the side of two distinct symbols speed Band is compatible in asymmetric twin single-sideband system.
Above example only to illustrate technical scheme rather than be limited, the ordinary skill of this area Personnel can modify to technical scheme or equivalent, without departing from the spirit and scope of the present invention, this The protection domain of invention should be to be defined described in claim.

Claims (10)

1. a kind of asymmetric twin method of Single Side Band Module, its step is：
1) protection interval according to needed for optical filter edge slope determines asymmetric twin single sideband singal；
2) baud rate of left side band, the right band is determined according to transmitting terminal bandwidth of a device, then wherein band will be filtered simultaneously To the left up-conversion, another side band is filtered and up-conversion to the right；Wherein, after up-conversion, in left side band, the right band The baud rate of band subtracts less than or equal to transmitting terminal bandwidth of a device less than or equal to transmitting terminal bandwidth of a device, the baud rate of another side band Deprotection interval；
3) to step 2) left side band that obtains, the right band be filtered acquisition single sideband singal respectively, left and right sideband be added after To asymmetric twin single sideband singal.
2. the method for claim 1, it is characterised in that the protection interval is Fgap=A/ γ GHz, wherein, A is logical The edge slope of the acceptable crosstalk threshold value of letter system, γ for optical filter.
3. method as claimed in claim 1 or 2, it is characterised in that step 2) in, it is described to be filtered into nyquist filtering.
4. method as claimed in claim 3, it is characterised in that set the baseband signal of left side band as s1T (), baud rate are B1, it is right The baseband signal of sideband is s2T (), baud rate are B2；s1After (t) up-conversion it iss2After (t) up-conversion it is
s 1 ‾ ( t ) = Re { s 1 ( t ) } · c o s ( 2 π · k 1 B 1 t ) + Im { s 1 ( t ) } · s i n ( 2 π · k 1 B 1 t )
s 2 ‾ ( t ) = Re { s 2 ( t ) } · c o s ( 2 π · k 2 B 2 t ) - Im { s 2 ( t ) } · s i n ( 2 π · k 2 B 2 t ) ,
Wherein, Re { } represents the operation for the treatment of excess syndrome portion, and Im { } is represented and taken imaginary part operation, k1Left side band up-conversion coefficient is represented, is met k1>0.5+ α/2, k2The right band up-conversion multiple is represented, k is met2>Fgap/B2+ 0.5+ α/2, α are roll-offed for nyquist filtering Coefficient.
5. method as claimed in claim 3, it is characterised in that the rolloff-factor α values of the nyquist filtering are 0.01.
6. method as claimed in claim 1 or 2, it is characterised in that step 3) in, it is described to be filtered into Hilbert filter.
7. method as claimed in claim 1 or 2, it is characterised in that sending the asymmetric twin single sideband singal to communicating Before channel, dispersion pre-compensation is carried out to asymmetric twin single sideband singal on frequency domain：Spre(f)=S (f) exp (- β2L ω2/ 2), and wherein, SpreF () is frequency domain data after precompensation, S (f) is to pre-compensate for front frequency domain data, β2For GVD system Number, L is fiber lengths, and ω is the angular frequency relative to carrier wave.
8. a kind of asymmetric twin single sideband demodulation method, its step is：
1) receiving terminal independently receives left side band, the right band；For left side band：The right band is filtered completely by light filtering；It is right In the right band：Left side band is substantially filtered out by light filtering, it is ensured that remaining left side bandwidth is less than protection interval；
2) receiving terminal is to step 1) process after signal carry out down coversion and matched filtering, be then demodulated.
9. method as claimed in claim 8, it is characterised in that step 2) in, first to step 1) process after signal compensation Signal-signal beat frequency interference, then carries out down coversion and matched filtering；Wherein, utilize I=1,2, thermal compensation signal-signal beat frequency interference；riT () represents the single sideband singal for receiving, λ is amplitude factor,For compensation Signal afterwards.
10. a kind of asymmetric twin single sideband modulation, demodulating system, it is characterised in that including transmitting terminal and receiving terminal, wherein,
The transmitting terminal includes：Transmitting terminal nyquist filtering module, for carrying out Nyquist filter to left side band, the right band Ripple；Up-converter module, for carrying out up-conversion respectively to the signal after transmitting terminal nyquist filtering module filtered, wherein, on After frequency conversion, the baud rate of the sideband in left side band, the right band is less than or equal to transmitting terminal bandwidth of a device, the baud of another side band Rate deducts protection interval less than or equal to transmitting terminal bandwidth of a device；Hilbert filter module, for processing to up-converter module Signal afterwards carries out Hilbert filter and obtains single sideband singal, i.e., asymmetric twin single sideband singal；
The receiving terminal includes：Optical filter module, for left side band：The right band is filtered completely by light filtering；For the right Band：Left side band is substantially filtered out by light filtering, it is ensured that remaining left side bandwidth is less than protection interval；Down conversion module, is used for Down coversion is carried out to the signal after optical filter module process；Receiving terminal nyquist filtering module, for down conversion module Signal after process is filtered.
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CN108599862A (en) * 2018-03-27 2018-09-28 北京邮电大学 a kind of passive optical network uplink transmission method and optical line terminal
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CN107395288B (en) * 2017-07-24 2020-05-01 北京大学 Polarization diversity optical heterodyne coherent receiving method and system
CN107395288A (en) * 2017-07-24 2017-11-24 北京大学 The optical heterodyne coherent reception method and system of a kind of polarization diversity
CN108566250B (en) * 2018-03-02 2021-03-12 北京大学 Modulation and demodulation method and system based on carrier quadrature bias single sideband signal
CN108566250A (en) * 2018-03-02 2018-09-21 北京大学 A kind of modulator approach, demodulation method and system biasing single sideband singal based on multicarrier orthogonal
CN108599862A (en) * 2018-03-27 2018-09-28 北京邮电大学 a kind of passive optical network uplink transmission method and optical line terminal
CN111953424A (en) * 2020-09-17 2020-11-17 上海交通大学 Residual edge band optical signal modulation method and system and direct detection optical fiber communication method
CN112152956A (en) * 2020-09-17 2020-12-29 中电科仪器仪表有限公司 Single-sideband demodulation method for baseband signal tracking
CN112152956B (en) * 2020-09-17 2022-06-17 中电科思仪科技股份有限公司 Single-sideband demodulation method for baseband signal tracking
CN114465669A (en) * 2022-03-21 2022-05-10 网络通信与安全紫金山实验室 Mixed transmission system and method for intermediate frequency signals and millimeter wave signals
CN114465669B (en) * 2022-03-21 2023-11-07 网络通信与安全紫金山实验室 Intermediate frequency signal and millimeter wave signal mixed transmission system and method
CN115134005A (en) * 2022-06-29 2022-09-30 聊城大学 Direct detection method and system for bias double-sideband signal based on CADD receiver
CN115134006A (en) * 2022-06-29 2022-09-30 聊城大学 Carrier auxiliary differential detection method and device based on parallel multi-delay
CN115134005B (en) * 2022-06-29 2023-10-13 聊城大学 Direct detection method and system for bias double-sideband signal based on CADD receiver
CN115134006B (en) * 2022-06-29 2023-12-15 聊城大学 Carrier auxiliary differential detection method and device based on parallel multi-delay
WO2024066213A1 (en) * 2022-09-29 2024-04-04 网络通信与安全紫金山实验室 Envelope detection photon millimeter wave terahertz communication system and method

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