CN107743051A - Merging SLM PTS methods reduces the OFDM multi-plexing light accessing systems of peak-to-average force ratio - Google Patents
Merging SLM PTS methods reduces the OFDM multi-plexing light accessing systems of peak-to-average force ratio Download PDFInfo
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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
- 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
- H04B10/61—Coherent receivers
- H04B10/612—Coherent receivers for optical signals modulated with a format different from binary or higher-order PSK [X-PSK], e.g. QAM, DPSK, FSK, MSK, ASK
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
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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
- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
- H04L27/2698—Multicarrier modulation systems in combination with other modulation techniques double density OFDM/OQAM system, e.g. OFDM/OQAM-IOTA system
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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Abstract
The invention belongs to fiber optic communication access field, specially a kind of fusion SLM PTS methods reduce the OFDM multi-plexing light accessing systems of peak-to-average force ratio.In the present invention, in transmitting terminal, the algorithm that 8QAM ofdm signals use DMT modulation systems and merge SLM PTS methods is subjected to transmitting pre-treatment, while is detected using optical heterodyne in system receiving terminal and mixes down-conversion technique certainly and merge effective reception that SLM PTS methods have carried out low peak average ratio 8QAM ofdm signals.The beneficial effects of the present invention are for Fiber Access System, fusion SLM and PTS technologies provide an optimum choice scheme between reduction PAPR, computation complexity and the bit error rate.
Description
Technical field
The invention belongs to intelligent acess technical field, specially a kind of fusion SLM-PTS methods reduce the OFDM light of peak-to-average force ratio
Access system.
Background technology
It is to meet in Optical Access Network to spectrum efficiency and the growing demand of high speed information, some multidimensional at present
Multistage modulation format technology turns into mainstream applications scheme, such as：Light OFDM (OFDM) and QAM (quadrature amplitude modulation)
Technology.Meanwhile OFDM is as one of multi-carrier modulation (MCM) technology, in dispersion tolerance, the dynamically distributes of bandwidth and anti-ISI (symbols
Disturbed between number) aspect has fabulous performance, and Fast Fourier Transform (FFT) (FFT) technology can complete efficient hardware and realize.
However, one of the shortcomings that ofdm system is higher papr (PAPR), nonlinear high-power amplifier is reduced
Performance, cause non-linear negative effect.It is non-that non-linear negative effect easily occurs the waveform of the light ofdm signal in transmission
Linear distortion, even result in whole optical communication system transmission performance and deteriorate.
In order to overcome high PAPR problems, researcher, which proposes some, reduces the probabilistic method of PAPR values, such as fractional transmission
Sequence (PTS) and selected mapping method (SLM).PTS technologies introduce phase weighting to realize phase optimization, then by the sub-block of division
It is superimposed to reduce PAPR.SLM methods use different phase offsets, are multiplied by identical transmitting information sequence, and therefrom selection is provided
The transmitting sequence for having minimum PAPR is transmitted.But both technologies have some shortcomings, such as the high of PTS calculates complexity
Property and SLM reduce PAPR it is limited.
Announced on 09 25th, 2013, Publication No. CN103326985A, entitled " one kind reduces peak-to-average force ratio in OFDM
In the Chinese patent application of method ", a kind of fusion SLM and PTS wireless network schemes are disclosed, its basic thought is to need
The OFDM symbol of transmission is divided into two sub-blocks by former and later two half section or odd positions symbol, even bit set symbol；Pass through selection
Mapping algorithm, calculate symbolic vector and select the signal with minimum peak-to-average ratio to be transmitted；Made using different twiddle factors
The peak-to-average force ratio for obtaining OFDM symbol is reduced；One PAPR of weighting scheme and search for making PAPR minimum will be obtained by traversal
The two sub-blocks are merged transmission by the preferable sequence of energy.By the way that former OFDM symbol stream is carried out into segment processing, then it is segmented
Using SLM, PTS algorithm, the systematic function more excellent than traditional SLM, PTS algorithm is achieved.By to PTS and SLM algorithms
Emulation comparison can be carried out, wherein PTS error performances are better than SLM, but SLM will be slightly poorer than by reducing PAPR effects.Invention reduces
The technology of peak-to-average force ratio has the computation complexity of PAPR inhibitions more more preferable than SLM and PTS algorithms and same level in OFDM.But
It is that SLM branch number and PTS segmentation number are not illustrated in fusion SLM and PTS algorithm arrangements, and it is equal at peak
Than explanation of for illustrative purposes only, yet being come to nothing in terms of the bit error rate with computation complexity, therefore result does not have universality.In addition,
This scheme is not specific to transmission channel and system to be introduced, not with reference to light OFDM technical advantage.
Announce, publication No. CN102075483A, entitled " reduction ofdm signal peak-to-average force ratio on 01 13rd, 2011
Method " Chinese patent application in, by cascading SLM methods or PTS method with margining amplitude technique, PAPR drops.First by using
Packet count less SLM or PTS tentatively reduces signal peak-to-average ratio, and then the time domain data that PTS or SLM is exported is limited
PAPR is dropped to desired value by width method by setting amplitude limit rate.With only with PTS or SLM methods compared with this method because use point
Group number is fewer, and implementation complexity is low, with only this method tentatively reduces signal before amplitude limit compared with margining amplitude technique
PAPR, thus cause the distortion of signal fewer in same amplitude limit rate.This method has merged PTS or SLM methods and caused
Distorted signals it is few and margining amplitude technique drop peak-to-average force ratio is direct and realizes the advantages of simple.Its bit error rate performance in the case of Gaussian channel
There is certain decline compared with initial data, but it is little designing performance loss in SNR ranges of concern.But method
Only it is to sacrifice the further reduction that less complexity exchanges peak-to-average force ratio for, is not analyzed further for computation complexity.Simultaneously
The program is studied by Gaussian channel, is also not bound with light OFDM technical advantage.
The content of the invention
It is an object of the invention to provide the OFDM multi-plexing light accessing systems that a kind of fusion SLM-PTS methods reduce peak-to-average force ratio.
To achieve the above object, the technical solution adopted by the present invention is specific as follows.
A kind of fusion SLM-PTS methods reduce the OFDM multi-plexing light accessing systems of peak-to-average force ratio, in transmitting terminal, by 8QAM-OFDM signals
Using DMT modulation systems, and the algorithm for combining fusion SLM and PTS is pre-processed.
In the present invention, the signal of transmitting terminal downlink transmits in single-mode fiber.
In the present invention, in receiving terminal, SLM and PTS algorithm is detected and merged from mixed conversion method using optical heterodyne
Processing, carry out 8QAM-OFDM signal receptions.
In the present invention, the transmitting terminal of optical line terminal OLT includes two outside cavity gas laser ELC, two in system down link
Individual offset controller PC, electron-amplifier EA, any wave length generator, photo-coupler OC and intensity modulator MZM；8QAM-
Ofdm signal is modulated by DMT, after being handled in combination with the algorithm for merging SLM and PTS, input electric amplifier EA, then on
Pass to any wave length generator, and then input intensity modulator MZM；Two outside cavity gas laser ECL produce two-way CW lightwave signals,
In the input intensity modulator MZM modulation after offset controller PC processing all the way, another offset controller is inputted all the way in addition
After PC, coupled into photo-coupler OC.
In the present invention, downlink transmission channel is by the single-mode fiber SMF-28 groups with erbium-doped optical fiber amplifier EDFA
Into.
In the present invention, optical network unit end ONU receiving terminal, optical signal passes through the list with EDFA Erbium-Doped Fiber Amplifier EDFA
After mode fiber SMF-28, electric signal is converted to by PIN optical-electrical converters, then amplified by electric amplifier EA；Telecommunications after amplification
Number two-way is divided into by shunt, directly inputs input mixer after end frequency mixer Mixer, the shifted device PS of another way all the way
Mixer；After frequency mixer Mixer processing, signal enters low pass filter LPF and carries out LPF, so as to obtain 8QAM-OFDM electricity
Signal.
Compared to the prior art, fusion SLM-PTS methods are introduced into multi-plexing light accessing system by the present invention, after QAM modulation
Parallel signal carries out piecemeal processing, to reach the purpose for suppressing peak-to-average force ratio.DMT technologies are introduced into multi-plexing light accessing system by the present invention,
It is real signal after IFFT is converted, wideband high-frequency simulator RF devices is modulated and adjusted without IQ, are to reduce
The computation complexity and cost of system.The present invention provides trade-off optimization selection in terms of peak-to-average force ratio, computation complexity and the bit error rate, has
Hope the alternative system device as following soft exchange field.
Brief description of the drawings
Fig. 1 is low peak average ratio OFDM multi-plexing light accessing system structure charts.
Fig. 2 is that SLM and the flow chart of PTS method are merged in transmitter and receiver.
Graphs of a relation of the Fig. 3 between peak-to-average force ratio and complementary Cumulative Distribution Function curve.
Graph of a relation between Fig. 4 different sub-carriers quantity and computation complexity.
Graph of a relation between Fig. 5 signal to noise ratio and the bit error rate.
Embodiment
Fig. 1 is the structure chart of low peak average ratio OFDM multi-plexing light accessing systems in the present invention.The system includes：Two outside cavity gas lasers
(ELC), some electric amplifiers (EA), Polarization Controller (PC), any wave length generator, intensity modulator, photo-coupler (OC),
Erbium-doped fiber amplifier (EDFA), single-mode fiber (SMF), photodiode (PIN PD) and low pass filter (LPF).Launching
End, transmitting pre-treatment is carried out using the method for Discrete multi-tone (DMT) modulation system combination SLM and PTS algorithm fusion to signal.
The number of subcarriers that DMT is used is changed into 512, the length of wherein cyclic prefix (CP) is symbol for 256 after being conjugated symmetry transformation
The 1/16 of number time；10Gb/s 8QAM-OFDM signals caused by offline upload to any wave length generator, and then drive horse
Conspicuous-Zeng Deer modulators (Mach-Zehnder Modulator).Two outside cavity gas lasers (ECL) send two-way frequency interval and are
60GHz continuous laser (CW).All the way after Electro-optical Modulation, adjusted by 3dB photo-couplers (OC) with another way without data
After the CW couplings of system, transmitted into fiber link.
Transmission channel is made up of No. 28 standard single-mode fibers (SMF-28) of the 20km with EDFA.Two optical sidebands are in PIN
Beat frequency in PD, thereby produce 60GHz millimeter wave electric signal.Electric signal after conversion is amplified by RF amplifiers, and is used
One adjustable phase shifter is used for self-mixing and receives and filter out baseband signal by LPF.
Fig. 2 is the flow chart for merging SLM-PTS methods in the present invention in transmitter and receiver.Initial data passes through QAM
Protection interval is inserted after constellation mapping, after serioparallel exchange is completed, is divided into two sub-blocks, carry out respectively based on SLM technologies and
The OFDM modulation of PTS technologies.Length is that N input block is represented by vectorial X=[X0,X1,...,XN-1]T, N is equal to the letter
Number sub-carrier number, [] T represent transposition.After serial to parallel conversion, X is divided into two number sub-block XSLMAnd XPTS, wherein to XSLM
The OFDM modulation based on SLM technologies is carried out, to XPTSCarry out the OFDM modulation based on PTS technologies.
By XPTSCarry out being divided into M data sub-block, i.e. XPTS=[XPTS1,XPTS2,XPTS3,...,XPTSM], wherein M is point
Sub-block number is cut, and meets conditionAfter the Fast Fourier Transform Inverse with DMT, subsequence becomes
For the real sequence of non-overlapping copies, therefore there is weighting characteristic, so as to introduce phase weight factorsWherein M
To split sub-block number.For reduce system-computed complexity, the present invention in phase weight factorsValue be {+1, -1 }.By
Shown in IFFT conversion processes such as formula (1)：
Different transmission sequences is produced using out of phase weighted factor, the transmission sequence with minimum peak is selected and carries out
Transmission, and corresponding phase weight factors are transmitted as side information.
[B1, B2,B3,...,BM]=argmin (max (| xm|)) (2)
Wherein argmin () is to select the corresponding phase weight factors with minimum value, and max () transmits sequence x to selectm
Peak value.
After X segmentations, by XSLMV identical data block is copied as, it is P then to define phase offset(v)=[pv,0,
pv,1,pv,2,...,pv,N2-1] v=1,2 ..., V, wherein V are branch number, and meet conditionCalculated again to reduce
Miscellaneous degree, P (v) span is {+1, -1, j,-j }.After data block is multiplied with phase offset, convert, carried out soon by DMT
Fast Fourier inversion.
Peak-to-average force ratio is calculated by below equation：
The transmission sequence with minimum peak-to-average force ratio is selected to be transmitted, and will obtain the phase offset of minimum peak-to-average force ratio as
Side information is transmitted.
P=argmin (PAPR (xSLMv)) v=1,2,3..., V (5)
For wherein argmin () to select the phase shift sequence with minimum peak-to-average force ratio, PAPR () is to obtain transmission sequence
xSLMvPeak-to-average force ratio.
Then, the sequence for carrying out PTS and SLM technologies respectively is subjected to superimposed generation transmission sequence, further addition follows
Ring prefix, it is transmitted after parallel serial conversion.
Fig. 3 be the present invention when the segmentation times V that SLM branch numbers M is respectively 4,8 and PTS is 4, blending algorithm, SLM,
PTS and initial data CCDF curves.It can be divided into according to scheme of the invention following two：(a) it is better than in decresting than aspect, PTS
SLM (V=4, M=4)；(b) in decresting than aspect, PTS is inferior to SLM (V=4, M=8).For above two scheme, PAPR
Corresponding CCDF (CCDF) curve is respectively as Fig. 3 (a), (b) are shown.It is apparent from by figure, several probability class schemes
Peak-to-average force ratio can effectively be reduced.In addition, in both cases, proposed scheme is in compromise shape for reducing PAPR
State.
Fig. 4 is of the invention in the case of subcarrier is 16,32,64,128 and 256, and several decrestings are more multiple with calculating than scheme
Graph of a relation between miscellaneous degree.The computation complexity of SLM methods is mainly relevant with branch number M and sub-carrier number N.The meter of PTS method
It is mainly relevant with segmentation times V, sub-carrier number N and phase weight factors alternative sequence W to calculate complexity.SLM and PTS is merged to calculate
The computation complexity and SLM branch number M, PTS segmentation times V, sub-carrier number N and phase of method (adding comprising CM and plural number)
Weighted factor alternative sequence W is relevant.As seen from the figure, to obtain less computation complexity and peak-to-average force ratio, should select as few as possible
Sub-carrier number and branch quantity as much as possible.However, always the quantity of the subcarrier in transmission sequence can not very little, because tool
The scheme for having more multi-subcarrier has higher spectrum efficiency (SE), to the tolerance of dispersion and to the flexible of Dynamic Bandwidth Allocation
Property.
When SLM computation complexity is less than PTS (V=4, M=4), the computation complexity that the present invention proposes a plan has
Good compromise.When SLM computation complexity is more than PTS (V=4, M=8), the computation complexity that proposes a plan of the present invention compared with
Better performance is shown in few subcarrier.Therefore, can be selected appropriate according to the complexity of DSP processing according to user
Method reduce PAPR in actual applications.
Fig. 5 is the graph of a relation between the bit error rate performance and signal to noise ratio of the present invention.It is clear that when SNR is higher than 15dB,
The present invention propose a plan it is middle using fusion SLM-PTS scheme methods after the bit error rate (BER) be below 10-3.As V=4 and M=4 and
When SNR is less than 25dB, the present invention has more advantage than PTS and SLM schemes.As V=4 and M=8 and when SNR is more than 30dB, this hair
It is bright to have more advantage than PTS and SLM schemes.Therefore, the present invention provides PAPR in multi-plexing light accessing system, computation complexity and
Optimum choice scheme between BER.
Claims (6)
1. a kind of fusion SLM-PTS methods reduce the OFDM multi-plexing light accessing systems of peak-to-average force ratio, it is characterised in that in transmitting terminal, by 8QAM-
Ofdm signal uses DMT modulation systems, and the algorithm for combining fusion SLM and PTS is pre-processed.
2. OFDM multi-plexing light accessing systems according to claim 1, it is characterised in that the signal of transmitting terminal downlink is in single mode
Transmitted in optical fiber.
3. OFDM multi-plexing light accessing systems according to claim 1, it is characterised in that in receiving terminal, use optical heterodyne detection with
And the algorithm process from mixed conversion method fusion SLM and PTS, carry out 8QAM-OFDM signal receptions.
4. OFDM multi-plexing light accessing systems according to claim 1, it is characterised in that optical line terminal OLT in its downlink
Transmitting terminal include two outside cavity gas laser ELC, two offset controller PC, electron-amplifier EA, any wave length generator, light
Coupler OC and intensity modulator MZM；8QAM-OFDM signals are modulated by DMT, are entered in combination with fusion SLM and PTS algorithm
After row processing, electric amplifier EA is inputted, then uploads to any wave length generator, and then input intensity modulator MZM；Two exocoels
Laser ECL produces two-way CW lightwave signals, in the input intensity modulator MZM tune after offset controller PC processing all the way
System, is inputted after another offset controller PC all the way in addition, is coupled into photo-coupler OC.
5. OFDM multi-plexing light accessing systems according to claim 4, it is characterised in that downlink transmission channel is by with er-doped
Fiber amplifier EDFA single-mode fiber SMF-28 compositions.
6. OFDM multi-plexing light accessing systems according to claim 4, it is characterised in that optical network unit end ONU receiving terminal, light
Signal is converted to electric signal after the single-mode fiber SMF-28 with EDFA Erbium-Doped Fiber Amplifier EDFA, by PIN optical-electrical converters,
Then amplified by electric amplifier EA；Electric signal after amplification is divided into two-way by shunt, directly inputs end frequency mixer all the way
Input mixer Mixer after Mixer, the shifted device PS of another way；After frequency mixer Mixer processing, signal enters low pass filter
LPF carries out LPF, so as to obtain 8QAM-OFDM electric signals.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108566355A (en) * | 2018-04-24 | 2018-09-21 | 西安邮电大学 | A kind of Discrete Multitone modulation system peak-to-average ratio reduction algorithm |
| CN109194600A (en) * | 2018-09-25 | 2019-01-11 | 青岛科技大学 | A kind of FBMC/OQAM system peak-to-average is than suppressing method and system |
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| CN108566355B (en) * | 2018-04-24 | 2020-09-01 | 西安邮电大学 | Peak-to-average ratio reduction algorithm of discrete multi-tone modulation system |
| CN109194600A (en) * | 2018-09-25 | 2019-01-11 | 青岛科技大学 | A kind of FBMC/OQAM system peak-to-average is than suppressing method and system |
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