CN104038463B - Optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia - Google Patents
Optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia Download PDFInfo
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- CN104038463B CN104038463B CN201410294277.XA CN201410294277A CN104038463B CN 104038463 B CN104038463 B CN 104038463B CN 201410294277 A CN201410294277 A CN 201410294277A CN 104038463 B CN104038463 B CN 104038463B
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Abstract
A kind of optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia for modulating carrier wave field, carrier wave occurs adjusting means and produces frequency comb and select energy identical carrier wave to be modulated OFDM data, simultaneously according to the corresponding number of sub carrier wave of demand assignment of the unlike signal bit rate of the terminal user of each node, ofdm signal processing unit is that OFDM data selects corresponding modulation format and corresponding forward error correction coding and the signal receiving device that OFDM data is modulated on carrier wave and transmitted to each terminal user.The present invention realizes the signal bandwidth and property regulation of four dimensions by adjusting carrier wave, the number of subcarrier and the corresponding modulation format of selection, forward error correction coding, it is achieved thereby that going to carry out the distribution of the overall resource of network system from global angle.
Description
Technical field
It is specifically a kind of based on four-dimensional Dynamic Resource Allocation for Multimedia the present invention relates to a kind of system for modulating carrier wave field
Optical access network system.
Background technology
With the increase of access network system user number and increasing for type of service, using many in access network system
The mode of layer resource allocation can improve the efficiency of whole system resource allocation, so as to effective limited using whole system
Resource, while the flexibility ratio of network system can be lifted.
Access network system is most commonly used that light in time-multiplexed EPON (TDM-PON) structure, this system
Signal carries out descending pass in all signals of optical line terminal (OLT) in down direction only one of which wavelength in the form of broadcasting
It is defeated, and in time domain carry out user between data bandwidth distribution.After Optical Fiber Transmission, optical signal is assigned to by optical splitters
Each optical network unit (ONU) is held, and carries out Photoelectric Detection, during up difference by the laser of each ONU end in time domain
Carve the transmission for carrying out upstream data.With growing, the PON of wavelength-division multiplex of increase and the user's request of high bandwidth business
(WDM-PON) system is suggested, and each ONU carries out downstream signal by single carrier wave in this kind of passive access network network system
Modulation, the signal after modulation is combined by array waveguide grating (AWG), then carries out the transmission of optical fiber, and then each light is believed
Number signal can be assigned to by each ONU end by AWG, then downstream signal is elicited by photoelectricity.Uplink signal transmissions are logical
Each ONU end is crossed each to be transmitted using the laser of different wavelength, OLT ends by the signal of each wavelength separately again
Carry out signal detection.With abundant and to the requirement of optical access network system spectrum efficiency the lifting of access network data type, orthogonal frequency
The EPON (OFDMA-PON) of point multiplexing is widely studied, in Single wavelength OFDMA-PON structures, downlink data and upper
The distribution of row data can carry out flexible allocation in time domain frame and photon intercarrier, and each subcarrier can use the modulation of high-order
Pattern.Therefore the data transfer rate of system and the flexibility of lifting system can be improved by using OFDMA-PON technologies.
As TWDM-PON turns into the standard of Next Generation Access network system, multiple light are needed in NGN system
Carrier wave carries out the transmission of signal, and the network traffics of system can be greatly promoted in combination with OFDM technology before.Therefore under
The resource for having multiple dimensions in generation optical access network system can be optimized, including：Carrier wave, subcarrier, modulation
Pattern, etc., therefore it is very necessary that the resource of whole system, which is optimized, from global angle.
Found by the retrieval to prior art, the paper in ECOC international conference papers We.3.A.1 in 2012：Fred
Buchali,and Henning Bülow,“Experimental Transmission with POL‐QAM and PS‐QPSK
Modulation Format Using a28‐Gbaud4‐D Transmitter”.The researcher of German AT＆T Labs carries
Go out and the signal of transmission is modulated in the synchronization and positive cross-channel of two polarization states of carrier wave respectively, so that the letter of a total of four dimensions
Breath, the data for transmission carry out the codings of four dimensional signals it is achieved thereby that the increase of signal modulation dimension, but the technology is main
It is the performance optimization that four dimensional signals have been carried out for pattern aspect, does not carry out the global optimization of system resource.
The retrieval discovery of further paper, the IEEE Photonics Technology Letter delivered for 2012,
The paper of 12 phases of volume 24：Murat Arabaci,Ivan B.Djordjevic,Lei Xu,and Ting Wang
“Nonbinary LDPC‐Coded Modulation for Rate‐Adaptive Optical Fiber
The research people of Communication Without Bandwidth Expansion ", NEC Corporation of the U.S. and University of Arizona
Member proposes selects the low-density of different code checks strange for the signal to noise ratio (SNR, signal to noise ratio) for transmitting signal
Even parity check code (LDPC), it is achieved thereby that flexible forward error correction coding (FEC, forward error correction), is carried
The scheme gone out selects suitable error correcting code mainly for the transmission characteristic of channel.
By the retrieval discovery to prior art, Chinese patent literature CN102035789, publication date 2011-4-27, note
Signal in a kind of smooth OFDM (OFDM) dynamically distributes passive access network system and method, the system is carried and has sent single
The multicarrier that the light multicarrier generation unit that member is included is produced is input to dynamic OFDM generation units, and then is sent to linking element
In, signal carries out palarization multiplexing, fibre channel transmission and polarization demultiplexing in linking element；Signal Matching receiving unit is utilized
Signal detection module obtains the radiofrequency signal for carrying information, then demodulates through signal demodulation process unit the information needed for user.
But defect and deficiency of the prior art compared with the present invention are multiple not from subcarrier, carrier wave and modulation format FEC etc.
Dimension carries out the global optimization of system resource.
The content of the invention
There is provided a kind of soft exchange based on four-dimensional Dynamic Resource Allocation for Multimedia for deficiencies of the prior art by the present invention
Network system, four are realized by adjusting carrier wave, the number of subcarrier and the corresponding modulation format of selection, forward error correction coding
The signal bandwidth and property regulation of dimension, it is achieved thereby that going to carry out the distribution of the overall resource of network system from global angle.
The present invention is achieved by the following technical solutions, and the present invention includes：Central station, some sections being connected with central station
Some terminal users on point, each node, OFDM (OFDM) signal processing apparatus and load for being arranged at central station
Adjusting means and the signal receiving device being arranged on each terminal user occur for ripple, wherein：Adjusting means production occurs for carrier wave
Raw frequency comb simultaneously selects energy identical carrier wave to be modulated OFDM data, while according to the terminal user of each node not
With the corresponding number of sub carrier wave of demand assignment of signal bit rate, ofdm signal processing unit, which is that OFDM data selection is corresponding, to be adjusted
Pattern processed and corresponding forward error correction coding and the letter that OFDM data is modulated on carrier wave and transmitted to each terminal user
Number reception device.
The demand of the unlike signal bit rate of the described terminal user according to each node specifically refers to disclosure satisfy that use
The demand of bit rate needed for family.
The selection rule of described modulation format refers to：Appropriate QAM codes are selected according to the performance for receiving end subscriber first
Type, it is determined that corresponding FEC encoder bit rates are selected after pattern, for the spectrum efficiency of lifting system to greatest extent.
Described modulation format specifically refers to orthogonal amplitude modulation technique (QAM, Quadrature amplitude
Modulation) the modulation format of the high-order produced, including：Four phase keyings (QPSK, quadrature phase
Shifting keying), 8-QAM, 16-QAM or 32-QAM.
Described forward error correction coding specifically refers to Read-Solomon (RS, the Reed-solomon) coding of different code checks
Or the multiple RS codings of cascade, coordinate different planispheres to count by selecting different code checks, so that for different
The Signal coding and pattern of OFDM data selection corresponding signal transmission.
The transmission form of described OFDM data is strong modulation and directly detected, makes when OFDM data is modulated on carrier wave
It is symmetrical with Han meter Er Te, and protection sideband is added between carrier wave and OFDM data, while being added in OFDM data before circulation
Sew.
Adjusting means, which occurs, for described carrier wave includes：The cascade external modulator that is sequentially connected in series, first wave length selecting switch,
One MZ Mach-Zehnder and second wave length selecting switch, wherein：Cascade external modulator includes：Second Mach be sequentially connected in series
Zeng Deer modulators, phase-modulator and clock radio frequency signals drive circuit, described the first MZ Mach-Zehnder
Prevention at radio-frequency port is connected with the output end of ofdm signal processing unit.
Described signal receiving device includes：Dispersion compensation module, wave filter, photodetector and the OFDM being sequentially connected in series
Digit receiver, wherein：The OFDM data received is converted to digital information by OFDM receiver, and same through oversampling clock with this
Step, signal equalization, remove cyclic prefix, Fast Fourier Transform (FFT) and go here and there transformation, demapping encoded after binary signal
Sequence, then the decoding operate of forward error correction coding is carried out, so that recovering needs the data message transmitted to compile.
The present invention is realized for each user's different channels performance of passive optical network by four-dimensional resource allocation
The overall situationization optimization of system resource, substantially increases flexibility and applicability during with bit rate.
Brief description of the drawings
Fig. 1 is present system structured flowchart；
Fig. 2 is workflow diagram of the present invention；
Fig. 3 is the theory diagram of embodiment 1；Wherein, OFDM Signal：Ofdm signal, S/P：Serioparallel exchange,
Mapping：Mapping, IFFT：Inverse fast Fourier transform device, P/S：Parallel-to-serial converter, DAC：Digital analog converter, MZM：Mach was once
Dare modulator, PM：Phase-modulation, WSS：Wavelength-selective switches, DCM：Dispersion compensation module, ADC：Analog-digital converter, FFT：
Fast Fourier transformer.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementations
Example.
Embodiment 1
As shown in figure 1, the system that the present embodiment is directed to is annular optical access network system, wherein containing multiple carrier waves
Signal is produced in central site, according to the channel performance of the terminal user at each node, by adjusting modulation format and FEC
The efficiency of transmission of maximum is encoded up, so as to realize the spectrum efficiency of maximum.Then according to having at each node, user's is total
Bandwidth selection appropriate number of sub carrier wave and carrier number, can be selected when more than a carrier wave at corresponding node
More than the number of a carrier wave, so as to be imitated by modulation format and forward error correction coding FEC come the frequency spectrum of maximum lifting system
Rate, then meet by the number of carrier wave and subcarrier the demand of unlike signal bit rate.
As shown in Fig. 2 the process of the present embodiment four-dimension Dynamic Resource Allocation for Multimedia, selects corresponding according to the performance of user terminal first
Modulation format and corresponding forward error correction coding FEC, in order to the spectrum efficiency of lifting system to greatest extent, then
The data transfer rate being actually needed according to each user and node selects corresponding carrier wave and number of sub carrier wave, coordinates what each node went out
The distribution of bandwidth between user is realized in filtering.
As shown in figure 3, the unifrequency light that described laser is sent enters MZM polarization state by Polarization Controller, together
When MZM multiple carrier waves are obtained by the clock radio frequency signals drive of high level, the wave carrier signal then produced continues through Polarization Control
Device and PM thereafter carry out the generation of wave carrier signal, and now PM is similarly by clock radio frequency signals drive, multiple light carriers of generation
The energy identical carrier wave of respective number is obtained by WSS selection.Then the ofdm signal produced is modulated at each light load
On ripple, what is provided in figure is that each subcarrier is modulated by same data jointly, needs every height to carry during actual use
Ripple one corresponding modulator of correspondence, so as to realize that each carrier wave can have different data, each data carrier of generation is again
It is combined by WSS, simplifies WSS function in Fig. 3 using wave filter, so as to obtain the data that each carrier wave is modulated, connect
The transmission that multi-carrier data carries out long range by fibre system, while simulation drawing can be distinguished according to different transmission ranges
The situation of different transmission nodes in 1, needs to compensate the dispersive influence of transmitting procedure introducing with DCM when long range is transmitted,
Then signal, which is amplified and filtered, obtains single optical carrier, enters back into photodetector and converts optical signals to electric signal,
Corresponding electric signal can be recovered by the DSP processing for receiving chip.
Above-mentioned ofdm signal is mainly transmitted in systems by intensity modulated/directly detection IM/DD form, main
Wanting process includes：The forward error correction coding FEC that signal is needed first, then obtains QAM signals by mapping, passes through string
And the data of multiple carrier waves are converted to, while inverse fast Fourier transform IFFT is carried out, by each signal modulation to accordingly
On OFDM carrier waves, Han meter Er Te non-symmetric techniques are employed herein and the technology of protection sideband is added between carrier wave and signal, so that
The influence of beat frequency noise between IMDD and signal for system is realized, while needing to add cyclic prefix wherein.
Optical signal is transferred to each node in Fig. 1 by optical fiber link, carrier wave that each node is distributed according to system and
Corresponding carrier wave is continued to transmit or be transferred to the multiple terminal data users of correspondence in node by the selection of the factors such as number, is then existed
User's end signal passes through the operation of Fig. 2 ends：Amplification, filtering etc. extract corresponding optical carrier, then pass through photoelectricity
Detector obtains corresponding optical signal, and the operation that the ofdm signal of electrical domain then is carried out into DSP by fpga chip etc. is handled.
The major function of OFDM process chips includes：The OFDM data information of simulation is converted into digital information, it is then real
The clock of existing signal is synchronous, and the signal of transmission is converted to OFDM single frame by the operation to each frame structure.Then enter
The equilibrium of row signal, remove cyclic prefix, quick Fourier transformation FFT and go here and there after transformation P/S, demapping encoded
Sequence of binary signals, is selecting the parameters such as forward error correction coding FEC code rate to carry out obtained binary signal according to data
The operation of fec decoder, so that recovering needs the data message transmitted to compile.
The data transfer rate of each user can change at any time in actual passive optical access network network system, but in optical network system
In each user channel performance close to stable, therefore only need to carry out carrier wave and the resource allocation again of subcarrier just can be again
The overall resource optimization for realizing system.
Claims (1)
1. a kind of optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia, it is characterised in that including：Central station and center
Some nodes that station is connected, some terminal users on each node, the ofdm signal processing unit and load for being arranged at central station
Adjusting means and the signal receiving device being arranged on each terminal user occur for ripple, wherein：Adjusting means production occurs for carrier wave
Raw frequency comb simultaneously selects energy identical carrier wave to be modulated OFDM data, while according to the terminal user of each node not
With the corresponding number of sub carrier wave of demand assignment of signal bit rate, ofdm signal processing unit, which is that OFDM data selection is corresponding, to be adjusted
Pattern processed and corresponding forward error correction coding and the letter that OFDM data is modulated on carrier wave and transmitted to each terminal user
Number reception device；
Described modulation format specifically refers to the modulation format of the high-order of quadrature amplitude modulation generation, including：QPSK、8-QAM、
16-QAM or 32-QAM；
Described forward error correction coding specifically refers to the Reed Solomon Coding or the RS codings that cascade is multiple of different code checks,
Different planispheres are coordinated to count by selecting different code checks, so that for different OFDM data selection corresponding signal transmission
Signal coding and pattern；
The transmission form of described OFDM data is strong modulation and directly detected, the Chinese is used when OFDM data is modulated on carrier wave
Mil is special symmetrical, and adds protection sideband between carrier wave and OFDM data, while adding cyclic prefix in OFDM data；
Adjusting means, which occurs, for described carrier wave includes：The external modulator of the cascade being sequentially connected in series, first wave length selecting switch, first
MZ Mach-Zehnder and second wave length selecting switch, wherein：The external modulator of cascade includes：Second Mach be sequentially connected in series
The clock radio frequency signals drive circuit of Zeng Deer modulators and phase-modulator and two kinds of modulators, described first Mach was once
The prevention at radio-frequency port of Dare modulator is connected with the output end of ofdm signal processing unit；
Described signal receiving device includes：Dispersion compensation module, wave filter, photodetector and the OFDM numerals being sequentially connected in series
Receiver, wherein：The OFDM data received is converted to digital information by OFDM receiver, and with this through oversampling clock synchronization, letter
Number equilibrium, remove cyclic prefix, Fast Fourier Transform (FFT) and go here and there transformation, demapping encoded after sequence of binary signals,
The decoding operate of forward error correction coding is carried out again, so that recovering needs the data message transmitted to compile.
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| CN104734783B (en) * | 2015-04-13 | 2017-08-15 | 天津理工大学 | A kind of random waveform optical pulse generator |
| CN113489546B (en) * | 2021-06-29 | 2022-12-27 | 上海电力大学 | Multi-user dual-band transceiver design method suitable for PON system |
| CN116419099A (en) * | 2021-12-31 | 2023-07-11 | 华为技术有限公司 | Point-to-multipoint optical communication method, device and system |
| CN116295783A (en) * | 2023-03-09 | 2023-06-23 | 中国科学院声学研究所 | Underwater full-digital optical fiber hydrophone system suitable for remote transmission |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1466297A (en) * | 2002-06-13 | 2004-01-07 | 华为技术有限公司 | Self-adaptive modulating and coding method |
| CN102325122A (en) * | 2011-10-20 | 2012-01-18 | 电子科技大学 | Two-way passive optical network system based on OFDM-ROF (Orthogonal Frequency Division Multiplexing-Radio Over Fiber) |
| CN102334321A (en) * | 2009-02-26 | 2012-01-25 | 阿尔卡特朗讯 | Power manageable optical OFDM transponder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1466297A (en) * | 2002-06-13 | 2004-01-07 | 华为技术有限公司 | Self-adaptive modulating and coding method |
| CN102334321A (en) * | 2009-02-26 | 2012-01-25 | 阿尔卡特朗讯 | Power manageable optical OFDM transponder |
| CN102325122A (en) * | 2011-10-20 | 2012-01-18 | 电子科技大学 | Two-way passive optical network system based on OFDM-ROF (Orthogonal Frequency Division Multiplexing-Radio Over Fiber) |
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