CN108111226A - A kind of system and method for polar coordinates coded modulation - Google Patents
A kind of system and method for polar coordinates coded modulation Download PDFInfo
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- CN108111226A CN108111226A CN201711377380.0A CN201711377380A CN108111226A CN 108111226 A CN108111226 A CN 108111226A CN 201711377380 A CN201711377380 A CN 201711377380A CN 108111226 A CN108111226 A CN 108111226A
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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
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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
- H04B10/532—Polarisation modulation
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Abstract
A kind of system and method for polar coordinates coded modulation, it is related to the optical communication system of straight straightening inspection, QAM signals are obtained by original data stream in transmitting terminal, if the QAM signals for doing length is taken to form data symbol, the amplitude and phase of QAM signals, coding is re-started according to the probability distribution of amplitude and phase value, then the encoded radio of amplitude and phase information is combined into new data symbol respectively in calculating per frame signal, the data frame for transmission is formed, optical signal is re-formed and sends；In receiving terminal, by the optical signal received after opto-electronic conversion, extraction data frame and channel compensation, the decision threshold obtained according to probability encoding recovers amplitude and phase information, recovers original data flow by the original QAM signals recovered.The present invention is on the basis of original system complexity and algorithm complexity is kept, by polar coordinates coding techniques and probability encoding technology, the Modulation and Coding Scheme of realization spectral efficient in the case where optical communication system framework is examined in straight straightening.
Description
Technical field
The present invention relates to straight straightening inspection optical communication system, in particular to a kind of polar coordinates coded modulation system and
Method.
Background technology
It among the optical communication networks such as short-distance transmission, access, is limited be subject to cost, mainly using straight straightening inspection
Coding modulation technique carries out network design.The program is widely used due to of low cost and simple in structure.With net
The rapid development of network traffic capacity demands, original this low frequency spectrum effect of OOK (On-Off Keying, binary system on off keying)
The modulation coding scheme of rate has been unable to meet existing high-speed communicating network.With the appearance of light coherent communication technology, OFDM
(Orthogonal Frequency Division Multiplexing, i.e. orthogonal frequency division multiplexi), QAM
(Quadrature Amplitude Modulation, quadrature amplitude modulation) so spectral efficient Modulation and Coding Scheme by
Step is applied among the optical transport networks such as long-distance, metropolitan area.It is more using straight straightening however in the application scheme of low cost
Inspection technology rather than light coherent communication technology, therefore how to realize that the modulation of spectral efficient is compiled in existing low-cost network framework
Code scheme, becomes the hot spot studied in recent years in light short-distance transmission and Optical Access Network.
In order to realize that the light modulation of inexpensive spectral efficient encodes, scientific research personnel proposes in the case where Technical Architecture is examined in straight straightening
Many different schemes are such as based on CAP (Carrierless Amplitude/phase Modulation, no-load wave amplitude phase
Modulation) modulation coding techniques, the modulation coding techniques of the light Orthogonal Frequency Division Multiplexing (DCO-OFDM) based on direct current biasing, these
Method is not the complexity for increasing system constructing, is exactly to increase the digital signal processing algorithm complexity for receiving signal, for base
It is not that one kind selects well in the straight straightening check system of low cost application.
The content of the invention
For defect in the prior art, it is an object of the invention to provide a kind of systems of polar coordinates coded modulation
And method so that whole system encodes skill on the basis of original system complexity and algorithm complexity is kept by polar coordinates
Art and probability encoding technology realize the Modulation and Coding Scheme of spectral efficient in the case where optical communication system framework is examined in straight straightening.
To achieve the above objectives, the present invention takes a kind of system of polar coordinates coded modulation, including：
Transmitting terminal is used to obtain QAM signals by original data stream, and the QAM signals of N point length form a data symbols
Number, it is additionally operable to calculate the amplitude and phase of QAM signals in every frame signal, is weighed respectively according to the probability distribution of amplitude and phase value
It is newly encoded, the encoded radio of amplitude and phase information is combined into new data symbol, form the data frame for transmission；
Receiving terminal is used to the data frame received carrying out channel compensation, to obtained decoded symbol data, according to general
The decision threshold that rate encodes recovers amplitude and phase information, recovers original by the original QAM signals recovered
Data flow.
Based on the above technical solutions, the transmitting terminal includes originator digital signal processor, Digital Signal Processing
Device includes：
Mapping block is used to carry out planisphere mapping code to original data stream, obtains QAM signals；
Computing module is used to form data symbol according to QAM signals, wherein containing N point QAM signals in each symbol；
Coding module is used to calculate the amplitude and phase of QAM signals in every frame signal；
Framing module is used to re-start coding respectively according to the probability distribution of amplitude and phase value, by amplitude and
The encoded radio of phase information is combined into new data symbol, forms data frame.
Based on the above technical solutions, the transmitting terminal includes digital analog converter and straight tunable light emission machine, the number
Mode converter is used to the digital signal for digital signal processor output of starting being converted to analog signal；The straight tunable light emission machine
For the analog signal to be modulated into optical signal and is sent.
Based on the above technical solutions, the receiving terminal includes straight inspection receiver, analog-digital converter and receiving end number
Signal processor, the straight inspection receiver are analog signal for that will receive optical signal through opto-electronic conversion；The analog-digital converter
For converting analog signals into digital signal；The receiving end digital signal processor includes：
Extraction module is used to extract data frame, and channel compensation is carried out to signal；
Decoder module decodes the amplitude and phase signal that are obtained after compensation；
Recovery module, the decision threshold obtained according to probability encoding recover amplitude and phase information, obtain original
QAM signals；
Original QAM signals are input to planisphere demapping by De-mapping module, are recovered its original transmission signal, are obtained
Original data stream.
Based on the above technical solutions, transmitting terminal includes header signal for the data frame of transmission, estimates for channel
The data symbol of meter and M data symbol, each data symbol are made of the range signal and N point phase signals of N points.
Also a kind of method of polar coordinates coded modulation of the present invention, including step：
In transmitting terminal, QAM signals are obtained by original data stream, if the QAM signals for doing length is taken to form data symbol, meter
The amplitude and phase of QAM signals, coding is re-started according to the probability distribution of amplitude and phase value respectively in calculating per frame signal,
The encoded radio of amplitude and phase information is combined into new data symbol again, forms the data frame for transmission, re-forms light letter
It number sends；
In receiving terminal, by the optical signal received after opto-electronic conversion, extraction data frame and channel compensation, according to probability encoding
Obtained decision threshold recovers amplitude and phase information, recovers original data by the original QAM signals recovered
Stream.
Based on the above technical solutions, in input terminal, initial data to be transmitted is mapped to obtain by planisphere
QAM signals re-form data symbol, and contain N point QAM signals in each data symbol.
Based on the above technical solutions, in input terminal, formula is passed through：I+j*Q=Rejθ, width is carried out to QAM signals
Degree and phase calculation, wherein I and Q are input signal, represent the real and imaginary parts of QAM signals, R and θ respectively as output signal,
The amplitude and phase of QAM signals are represented respectively.
Based on the above technical solutions, transmitting terminal includes header signal for the data frame of transmission, estimates for channel
The data symbol of meter and M data symbol, each data symbol are made of the range signal and N point phase signals of N points.
Based on the above technical solutions, in receiving terminal, the signal dropped to is subjected to luminous point conversion first, then will be obtained
Analog signal switch to digital signal, then carry out data frame extraction, while according to send channel estimation Signal to signal into
Row channel compensation.
The beneficial effects of the present invention are：
The present invention takes full advantage of the technical characterstic of polar coordinates coded modulation, by the QAM signals of two-dimensional modulation into line amplitude
With the code conversion of phase, one-dimensional modulation is become, so as to meet the spectral efficient of straight straightening check system under low cost
Transmission performance demand does not increase original system complexity and algorithm complexity.
Meanwhile the characteristics of being distributed according to amplitude and phase signal non-equal, by probability encoding technology, do not increasing volume
Under conditions of external system expense nor affects on its noise robustness, only by the mode of coding, coding gain is obtained, so as to carry
Whole system performance has been risen, has effectively enhanced practicability of the straight straightening check system in the application environments such as short distance, soft exchange.
Description of the drawings
Fig. 1 is sending end structure schematic diagram of the embodiment of the present invention；
Fig. 2 implements transmitting terminal data frame structure schematic diagram for the present invention；
Fig. 3 is receiving terminal structure diagram of the embodiment of the present invention.
Reference numeral：
Transmitting terminal 1, digital signal processor 11 of starting, mapping block 111, computing module 112, coding module 113, framing
Module 114, digital analog converter 12 are straight to dim transmitter 13；
Receiving terminal 2 is straight to examine receiver 21, analog-digital converter 22, receiving end digital signal processor 23, extraction module 231, solution
Code module 232, recovery module 233, De-mapping module 234.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
As shown in figures 1 and 3, the system of polar coordinates coded modulation of the present invention can be applied to straight straightening inspection optic communication system
In system, it is divided into transmitting terminal 1 and receiving terminal 2.
As shown in Figure 1, transmitting terminal 1 includes originator digital signal processor 11, digital analog converter 12 and directly dims transmitter
13.Digital signal processor 11 of starting includes mapping block 111, computing module 112, coding module 113 and framing module 114.
Specifically, mapping block 111 is used to carry out planisphere mapping code to original data stream, QAM signals are obtained.It calculates
Module 112 is used to form data symbol according to QAM signals, wherein containing N point QAM signals, M data symbols in each data symbol
Number form data frame a part.Coding module 113 is used to calculate the amplitude and phase of QAM signals in every frame signal, wherein, often
Frame signal by header signal, for channel estimation data symbol and by the M group of data symbols that QAM signals are formed into.
Framing module 114 is used to re-start coding respectively according to the probability distribution of amplitude and phase value, after the completion of coding, by amplitude
New data symbol is combined into the encoded radio of phase information, forms the data frame for transmission.As shown in Fig. 2, it is for sending out
The structure of the data frame sent, framing module 114 formed data frame include header signal, for channel estimation data symbol,
And M data symbol, each data symbol are made of the range signal and N point phase signals of N points.
Digital analog converter 12 is used to the digital signal that digital signal processor 11 of starting exports being converted to analog signal.Directly
Tunable light emission machine 13 is used to that analog signal to be modulated into optical signal and is sent.
As shown in figure 3, receiving terminal 2 includes straight inspection receiver 21, analog-digital converter 22 and receiving end digital signal processor 23.
Optical signal is analog signal by opto-electronic conversion for receiving optical signal by straight inspection receiver 21.Analog-digital converter 22 is used for
Obtained analog signal is converted into digital signal.Receiving end digital signal processor 23 includes extraction module 231, decoder module
232, recovery module 233 and De-mapping module 234.
Specifically, extraction module 231 is used to obtain data frame structure to the signal synchronization process received, while according to hair
Channels estimate that signal carries out channel compensation to signal.Decoder module 232 carries out the amplitude and phase signal that are obtained after compensation
Decoding.The decision threshold that recovery module 233 is obtained according to probability encoding recovers amplitude and phase information, obtains transmitting terminal
The 1 original QAM signals sent.The relation demapping that De-mapping module 234 maps original QAM signals according to planisphere is recovered
Original transmission signal obtains the original data stream of the transmission of transmitting terminal 1.
The method of polar coordinates coded modulation of the present invention, specifically comprises the following steps：
In transmitting terminal, encoded first by digital signal processor 11 of starting to sent data.It will need to pass
Defeated traffic spike is input in mapping block 111 and is encoded, and binary data-signal obtains after planisphere maps
To QAM signals.Then QAM signals are formed into data symbol, wherein containing N point QAM signals in each symbol, while by M QAM
Data symbol, the data symbol for channel estimation and header signal that signal is formed form a part for data frame.
In computing module 112, by formula (1) to QAM signals into the calculating of line amplitude and phase：
I+j*Q=Rejθ (1)
Wherein, I and Q is input signal, represents the real and imaginary parts of QAM signals, R and θ respectively as output signal, respectively
Represent the amplitude and phase of QAM signals, computing module 112 completes the process that signal is encoded to Polarization Coding by IQ.
Then probability encoding is carried out to output signal R and θ by coding module 113.For the QAM for thering is random signal to generate
For signal, every bit is all equal-probability distribution on planisphere, and after carrying out calculating amplitude and phase to it, due to difference
The constellation point of quantity has identical amplitude and phase, therefore it is respectively non-equal point to cause output amplitude and phase value
Cloth.If the amplitude R values of QAM signal outputs are respectively from small to large：r1、r2、r3……rk-1、rk, probability difference p1、p2、
p3……pk-1、pk.In order to enable its judgement space is identical with probability distribution, following coding is made, since signal is directly to modulate
Optical signal, set its normalized output minimum value as 0, maximum 1, respective amplitude value is r respectively1And rkWhen output
Amplitude.It is respectively a to set its k value1、a2、a3……ak-1、ak, according to the smallest point a of amplitude1It is positive and negative right to adjudicate space
Claim, maximum point akIt is infinitely great to adjudicate space, according to described above, signal meets following relation equation：
By k Simultaneous Equations, k value a of the normalized output of signal amplitude can be acquired1、a2、a3……ak-1、ak。
Similarly, if the angle, θ value of QAM signal outputs is respectively from small to large：θ1、θ2、θ3……θj-1、θj, probability difference q1、q2、
q3……qj-1、qj.Using same method, its normalized output minimum value is being set as 0, under conditions of maximum is 1, can obtained
It is respectively b to its output1、b2、b3……bj-1、bj, so far complete signal probability encoding process.
Finally, in framing module 114, signal and coding module after the Polarization Coding obtained to computing module 112
Signal after 113 obtained probability encodings carries out data arrangement and forms the data frame signal for being used for transmission.As shown in Fig. 2, it is used for
The data frame signal structure of transmission is：Header signal+for+M data symbols of data symbol of channel estimation, each data symbols
Number be made of the range signal and N point phase signals of N points, be consequently formed needed for transmission digital signal, so far complete sending out
Hold the signal processing flow in Digital Signal Processing 11.
The digital signal that originator Digital Signal Processing 11 exports becomes analog signal, analog signal by digital analog converter 12
It inputs to straight light modulation transmitter 13 to be directly modulated, ultimately forms modulated optical signal, and be carried out at the same time transmission.
In receiving terminal, the optical signal after being transmitted carries out opto-electronic conversion into straight examine in photoreceiver 21, obtained mould
Plan electric signal, which enters in analog-digital converter 22, is converted to digital signal, and digital signal then is transferred to receiving end digital signal processor
23 are handled, and concrete processing procedure is as follows：
Digital signal by extraction module 231 is carried out to the extraction of data frame first, while is believed according to signal estimation is sent
Number, channel compensation is carried out to signal.The amplitude obtained after compensation and phase signal are input in decoder module 232 and solved
Code.Specifically, when the amplitude received is X, and phase is Y；
So far probabilistic decoding process is completed.
According to amplitude and phase information that formula (3) and (4) obtain, in recovery module 233 according to formula (1) to its into
Row recovers, and finally obtains original QAM signals.The QAM after recovery is input in De-mapping module 234 again, passes through planisphere
Mapping recovers the original signal of transmitting terminal 1, obtains original data stream.
The transmitting terminal of the present invention uses the signal of polar coordinates coded modulation, by original high spectrum that can only carry out I, Q modulation
The QAM signals of efficiency re-start coding, its amplitude and phase are separately transmitted, so that signal modulation dimension is by two
Dimension becomes one-dimensional, so only needs to carry out the generation that directly modulation can be achieved with optical signal, is the letter for meeting straight straightening check system
Single structure requirement.Simultaneously as when amplitude and phase information are encoded, output state is non-equal-probability distribution, is
It improves the coding gain of polar coordinates coded modulation and carries out probability encoding so that the probability distribution of its exports coding sentences with signal
Certainly spatial probability distribution is consistent, so that its receptivity gets a promotion.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of system of polar coordinates coded modulation, which is characterized in that including：
Transmitting terminal is used to obtain QAM signals by original data stream, and the QAM signals of N point length form a data symbol, also
For calculating the amplitude and phase of QAM signals in every frame signal, according to the probability distribution of amplitude and phase value respectively again into
The encoded radio of amplitude and phase information, is combined into new data symbol by row coding, forms the data frame for transmission；
Receiving terminal is used to the data frame received carrying out channel compensation, to obtained decoded symbol data, be compiled according to probability
The decision threshold that code obtains recovers amplitude and phase information, recovers original number by the original QAM signals recovered
According to stream.
2. the system of polar coordinates coded modulation as described in claim 1, which is characterized in that the transmitting terminal includes originator number
Signal processor, digital signal processor include：
Mapping block is used to carry out planisphere mapping code to original data stream, obtains QAM signals；
Computing module is used to form data symbol according to QAM signals, wherein containing N point QAM signals in each symbol；
Coding module is used to calculate the amplitude and phase of QAM signals in every frame signal；
Framing module is used to re-start coding respectively according to the probability distribution of amplitude and phase value, by amplitude and phase
The encoded radio of information is combined into new data symbol, forms data frame.
3. the system of polar coordinates coded modulation as claimed in claim 2, it is characterised in that：The transmitting terminal includes digital-to-analogue conversion
Device and straight tunable light emission machine, the digital analog converter are used to the digital signal for digital signal processor output of starting being converted to mould
Intend signal；The straight tunable light emission machine is used to that the analog signal to be modulated into optical signal and is sent.
4. the system of polar coordinates coded modulation as claimed in claim 3, it is characterised in that：The receiving terminal includes straight inspection and receives
Machine, analog-digital converter and receiving end digital signal processor, the straight inspection receiver are through opto-electronic conversion for that will receive optical signal
Analog signal；The analog-digital converter is used to convert analog signals into digital signal；The receiving end digital signal processor bag
It includes：
Extraction module is used to extract data frame, and channel compensation is carried out to signal；
Decoder module decodes the amplitude and phase signal that are obtained after compensation；
Recovery module, the decision threshold obtained according to probability encoding recover amplitude and phase information, obtain original QAM letters
Number；
Original QAM signals are input to planisphere demapping by De-mapping module, are recovered its original transmission signal, are obtained original
Data flow.
5. such as the system of claim 1-4 any one of them polar coordinates coded modulations, it is characterised in that：Transmitting terminal is used to send
Data frame include header signal, data symbol and M data symbol for channel estimation, each data symbol is by N points
Range signal and N points phase signal composition.
A kind of 6. method of polar coordinates coded modulation, which is characterized in that including step：
In transmitting terminal, QAM signals are obtained by original data stream, if the QAM signals for doing length is taken to form data symbol, are calculated every
The amplitude and phase of QAM signals in frame signal re-start coding according to the probability distribution of amplitude and phase value respectively, then will
The encoded radio of amplitude and phase information is combined into new data symbol, forms the data frame for transmission, re-forms optical signal hair
Go out；
In receiving terminal, by the optical signal received after opto-electronic conversion, extraction data frame and channel compensation, obtained according to probability encoding
Decision threshold amplitude and phase information are recovered, pass through the data flow that the original QAM signals that recover recover original.
7. the method for polar coordinates coded modulation as claimed in claim 6, it is characterised in that：In input terminal, by original to be transmitted
Beginning data map to obtain QAM signals by planisphere, re-form data symbol, and believe in each data symbol containing N points QAM
Number.
8. the method for polar coordinates coded modulation as claimed in claim 6, which is characterized in that in input terminal, pass through formula：I+j*
Q=Rejθ, to QAM signals into line amplitude and phase calculation, wherein I and Q are input signal, represent the reality of QAM signals respectively
Portion and imaginary part, R and θ are output signal, represent the amplitude and phase of QAM signals respectively.
9. the method for polar coordinates coded modulation as claimed in claim 8, it is characterised in that：Transmitting terminal is used for the data frame of transmission
Including header signal, for the data symbol and M data symbol of channel estimation, each data symbol is believed by the amplitude of N points
Number and N points phase signal composition.
10. such as the method for claim 6-9 any one of them polar coordinates coded modulations, it is characterised in that：In receiving terminal, first
The signal dropped to is subjected to luminous point conversion, then obtained analog signal is switched into digital signal, then carries out the extraction of data frame,
Channel compensation is carried out to signal according to transmission channel estimation Signal simultaneously.
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| CN113169950A (en) * | 2018-09-07 | 2021-07-23 | 盈诺飞公司 | System and method for upsampling a stream of polar amplitude samples in a polar modulator |
| CN116805889A (en) * | 2023-08-21 | 2023-09-26 | 深圳市光为光通信科技有限公司 | Optical fiber transceiver module based on CPO technology |
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| CN113169950A (en) * | 2018-09-07 | 2021-07-23 | 盈诺飞公司 | System and method for upsampling a stream of polar amplitude samples in a polar modulator |
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| CN116805889A (en) * | 2023-08-21 | 2023-09-26 | 深圳市光为光通信科技有限公司 | Optical fiber transceiver module based on CPO technology |
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