CN104038463A - Optical access network system on basis of four-dimensional dynamic resource allocation - Google Patents
Optical access network system on basis of four-dimensional dynamic resource allocation Download PDFInfo
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Abstract
The invention discloses an optical access network system on the basis of four-dimensional dynamic resource allocation, and belongs to the field of modulated carriers. The optical access network system is characterized in that frequency combs are generated by carrier generating and regulating devices, OFDM (orthogonal frequency division multiplexing) data are modulated by selected carries with identical energy, corresponding numbers of sub-carriers are allocated according to different signal bit rate requirements of terminal users of various nodes, corresponding modulation formats and corresponding forward error correction codes are selected for the OFDM data by OFDM signal processing devices, and the OFDM data are modulated on the carriers and are transmitted to signal receiving devices of the various terminal users. The optical access network system has the advantages that the quantities of the carriers and the quantities of the sub-carriers are regulated, the corresponding modulation formats and the corresponding forward error correction codes are selected, accordingly, four-dimensional signal bandwidths and performance can be regulated, and integral resources of the network system can be allocated from a global perspective.
Description
Technical field
What the present invention relates to is the system in a kind of modulated carrier field, specifically a kind of optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia.
Background technology
Along with the increase of access network system number of users and increasing of type of service, the mode that adopts multilayer resource to distribute in access network system can improve the efficiency that whole system resource is distributed, thereby can effectively utilize the limited resource of whole system, can promote the flexibility ratio of network system simultaneously.
Access network system is the most frequently used is time-multiplexed EPON (TDM ?PON) structure, in this system, light signal only has a wavelength at down direction, the signals all at optical line terminal (OLT) carry out downlink transfer with the form of broadcast, and in time domain, carry out the distribution of data bandwidth between user.After Optical Fiber Transmission, light signal is assigned to each optical network unit (ONU) end by optical splitters, and carries out Photoelectric Detection, and the up laser of being held by each ONU does not carry out in the same time the transmission of upstream data in time domain.Growing along with the increase of high bandwidth business and user's request, the PON of wavelength division multiplexing (WDM ?PON) system is suggested, in this class passive access network network system, each ONU is carried out the modulation of downstream signal by independent carrier wave, signal after modulation closes road through array waveguide grating (AWG), carry out again the transmission of optical fiber, then each light signal can be assigned to each ONU by signal by AWG and holds, then elicites downstream signal through photoelectricity.Uplink signal transmissions is to adopt separately the laser of different wavelength to transmit by each ONU end, at OLT end, the signal of each wavelength is separately carried out to input again.Lifting abundant and that optical access network system spectrum efficiency is required along with Access Network data type, the EPON of OFDM (OFDMA ?PON) is widely studied, single wavelength OFDMA ?in PON structure, the distribution of downlink data and upstream data can be carried out flexible allocation at time domain frame and photon intercarrier, and each subcarrier can adopt the modulation format of high-order.Therefore by adopt OFDMA ?PON technology can improve the data transfer rate of system and the flexibility of elevator system.
Along with TWDM ?PON become the standard of Next Generation Access network system, in NGN system, need a plurality of light carriers to carry out the transmission of signal, simultaneously in conjunction with before the OFDM technology network traffics of elevator system greatly.Therefore in optical access network system of future generation, have the resource of a plurality of dimensions to be optimized, comprising: carrier wave, subcarrier, modulation format, etc., it is very necessary therefore from overall angle, the resource of whole system being optimized.
Through the retrieval of prior art is found, paper in ECOC international conference paper We.3.A.1 in 2012: Fred Buchali, and Henning B ü low, and " Experimental Transmission with POL ?QAM and PS ?QPSK Modulation Format Using a28 ?Gbaud4 ?D Transmitter ".The researcher of Germany's Bell Laboratory proposes the signal of transmission to be modulated at respectively on the synchronous and positive cross-channel of two polarization states of carrier wave, thereby always have the information of four dimensions, thereby the coding that carries out four-dimensional signal for the data of transmission has been realized the increase of signal modulation dimension, but this technology is mainly for pattern aspect, to have carried out the performance optimization of four-dimensional signal, does not carry out the global optimization of system resource.
Further the retrieval of paper is found, the IEEE Photonics Technology Letter delivering for 2012, the paper of the 24th 12 phases of volume: Murat Arabaci, Ivan B.Djordjevic, Lei Xu, and Ting Wang " Nonbinary LDPC ?Coded Modulation for Rate ?Adaptive Optical Fiber Communication Without Bandwidth Expansion ", the researcher of U.S. NEC Corporation and University of Arizona has proposed the signal to noise ratio (SNR for signal transmission, signal to noise ratio) select the low density parity check code (LDPC) of different code checks, thereby realized forward error correction coding (FEC flexibly, forward error correction), the scheme proposing is selected suitable error correcting code mainly for the transmission characteristic of channel.
Through the retrieval of prior art is found, Chinese patent literature CN102035789, open day 2011 ?4 ?27, a kind of smooth OFDM (OFDM) dynamic assignment passive access network system and method thereof have been recorded, the multicarrier that the light multicarrier generation unit that in this system, signal transmitting unit comprises produces is input to dynamic OFDM generation unit, and then be sent in link unit, signal carries out palarization multiplexing, fibre channel transmission and polarization demultiplexing in link unit; Signal Matching receiving element utilizes acquisition of signal module to obtain the radiofrequency signal of carry information, then demodulates the required information of user through signal demodulation process unit.But the defect that the prior art is compared with the present invention and not enough being are not carried out the global optimization of system resource from a plurality of dimensions such as subcarrier, carrier wave and modulation format FEC.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia is provided, by regulating the number of carrier wave, subcarrier and selecting corresponding modulation format, forward error correction coding to realize signal bandwidth and the property regulation of four dimensions, thereby realized the distribution of going to carry out the whole resource of network system from overall angle.
The present invention is achieved by the following technical solutions, the present invention includes: central station, the some nodes that are connected with central station, some terminal uses on each node, be arranged at OFDM (OFDM) signal processing apparatus and the carrier wave generation adjusting device of central station, and be arranged at the signal receiving device on each terminal use, wherein: carrier wave generation adjusting device produces frequency comb and selects the carrier wave that energy is identical to modulate OFDM data, simultaneously according to the corresponding number of sub carrier wave of demand assignment of the terminal use's of each node unlike signal bit rate, ofdm signal processing unit be the corresponding modulation format of OFDM data selection and corresponding forward error correction coding and by OFDM Data Modulation on carrier wave and transfer to the signal receiving device on each terminal use.
The described demand according to the terminal use's of each node unlike signal bit rate specifically refers to the demand that can meet the required bit rate of user.
The selective rule of described modulation format refers to: first according to receiving terminal user's performance, select suitable QAM pattern, after determining pattern, select corresponding FEC encoder bit rate, be used for the spectrum efficiency of elevator system to greatest extent.
Described modulation format specifically refers to orthogonal amplitude modulation technique (QAM, the modulation format of high-order Quadrature amplitude modulation) producing, comprise: four phase keyings (QPSK, quadrature phase shifting keying), 8 ?QAM, 16 ?QAM or 32 ?QAM.
Described forward error correction coding specifically refer to different code checks in moral ?Saloman (RS, Reed ?solomon) coding or RS repeatedly of cascade coding, by selecting different code checks to coordinate different planispheres to count, thus Signal coding and the pattern for different OFDM data selection corresponding signals, transmitted.
The transmission form of described OFDM data is strong modulation and direct-detection, and OFDM Data Modulation is used on carrier wave time Han meter Er Te symmetrical, and adds protection sideband between carrier wave and OFDM data, adds Cyclic Prefix in OFDM data simultaneously.
Described carrier wave generation adjusting device comprises: cascade external modulator, the first wavelength-selective switches, the first MZ Mach-Zehnder and the second wave length selector switch of connecting successively, wherein: cascade external modulator comprises: the second MZ Mach-Zehnder, phase-modulator and the clock radio frequency signals drive circuit of connecting successively, the prevention at radio-frequency port of the first described MZ Mach-Zehnder is connected with the output of ofdm signal processing unit.
Described signal receiving device comprises: dispersion compensation module, filter, photodetector and the OFDM digit receiver of connecting successively, wherein: OFDM receiver is converted to digital information by the OFDM data that receive, and with this through clock synchronous, signal equalization, removal Cyclic Prefix, fast Fourier transform, and sequence of binary signals after string changes, demapping is encoded, carry out again the decode operation of forward error correction coding, thereby recover, need the data message transmitting to compile.
When the present invention has realized for each user's different channels performance of passive optical network and bit rate by four-dimensional resource distribution, the globalize of system resource is optimized, and has greatly improved flexibility and applicability.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention;
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: string conversion, Mapping: mapping, IFFT: inverse fast Fourier transform device, P/S: parallel-to-serial converter, DAC: digital to analog converter, MZM: MZ Mach-Zehnder, PM: phase-modulation, WSS: wavelength-selective switches, DCM: dispersion compensation module, ADC: analog to digital converter, FFT: fast Fourier transformer.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the present embodiment for system be annular optical access network system, the signal that wherein contains a plurality of carrier waves produces at central site, according to the terminal use's of each Nodes channel performance, by regulating the coding of modulation format and FEC to reach maximum efficiency of transmission, thereby realize maximum spectrum efficiency.Then according to all users' of each Nodes total bandwidth, select suitable number of sub carrier wave and carrier number, when being greater than a carrier wave, can select to surpass at corresponding Nodes the number of a carrier wave, thereby by modulation format and forward error correction coding FEC, carry out the spectrum efficiency of maximum elevator system, then by the number of carrier wave and subcarrier, meet the demand of unlike signal bit rate.
As shown in Figure 2, the process of the four-dimensional Dynamic Resource Allocation for Multimedia of the present embodiment, first according to the performance of user side, select corresponding modulation format and corresponding forward error correction coding FEC, object is for the spectrum efficiency of elevator system to greatest extent, then according to the data transfer rate of each user and node actual needs, select corresponding carrier wave and number of sub carrier wave, the filtering that coordinates each node to go out realizes the distribution of bandwidth between user.
As shown in Figure 3, the polarization state that the unifrequency light that described laser sends enters MZM through Polarization Controller, MZM is obtained a plurality of carrier waves by the clock radio frequency signals drive of high level simultaneously, then the wave carrier signal producing continues to carry out the generation of wave carrier signal by Polarization Controller and PM thereafter, now PM is too by clock radio frequency signals drive, and a plurality of light carriers of generation obtain the identical carrier wave of energy of respective number through the selection of WSS.Then the ofdm signal producing is modulated on each light carrier, what in figure, provide is that each subcarrier is jointly by same Data Modulation, in actual use procedure, need the corresponding corresponding modulator of each subcarrier, thereby realize each carrier wave and can have different data, each data carrier producing closes road through WSS again, in Fig. 3, use filter to simplify the function of WSS, thereby obtain the modulated data of each carrier wave, then multicarrier data are grown the transmission of distance by fibre system, according to different transmission ranges, can distinguish the situation of transmission nodes different in simulation drawing 1 simultaneously, when long Distance Transmission, need to compensate the dispersive influence that transmitting procedure is introduced with DCM, then signal is exaggerated with filtering and obtains single optical carrier, enter again photodetector light signal is converted to the signal of telecommunication, processing by DSP receiving chip can recover the corresponding signal of telecommunication.
Above-mentioned ofdm signal mainly transmits in system by the form of intensity modulated/direct-detection IM/DD, main process comprises: the forward error correction coding FEC that first signal is carried out to needs, then by mapping, obtain QAM signal, by going here and there and being converted to the data of a plurality of carrier waves, carry out inverse fast Fourier transform IFFT simultaneously, each signal is modulated on corresponding OFDM carrier wave, adopted the symmetrical technology of Han meter Er Te herein and between carrier wave and signal, added the technology of protecting sideband, thereby realize between IMDD and signal beat frequency noise for the impact of system, need to add therein Cyclic Prefix simultaneously.
Light signal is transferred to each node in Fig. 1 through optical fiber link, each node continues corresponding carrier wave transmission or is transferred to corresponding a plurality of terminal data users in node according to selecting factors such as the carrier wave of system assignment and numbers, then the operation through Fig. 2 end at user side signal: amplification, filtering etc. extract corresponding optical carrier, by photodetector, obtain corresponding light signal again, then the ofdm signal in electric territory is carried out to the operational processes of DSP by fpga chip etc.
The major function of OFDM process chip comprises: the OFDM data message of simulation is converted to digital information, then realizes the clock synchronous of signal, by the operation of each frame structure being converted to the signal of transmission to the single frame of OFDM.Then carry out signal equilibrium, remove Cyclic Prefix, Fourier transform FFT, and the sequence of binary signals of string after changing P/S, demapping and being encoded fast, according to parameters such as data selection forward error correction coding FEC code checks, the binary signal obtaining is being carried out to the operation of fec decoder, thereby recover, needing the data message transmitting to compile.
In actual passive optical access network network system, each user's data transfer rate can change at any time, yet each user's channel performance approaches and stablizes in optical network system, the distribution of resource again that therefore only need to carry out carrier wave and subcarrier just can realize the whole resource optimization of system again.
Claims (6)
1. the optical access network system based on four-dimensional Dynamic Resource Allocation for Multimedia, it is characterized in that, comprise: central station, the some nodes that are connected with central station, some terminal uses on each node, be arranged at ofdm signal processing unit and the carrier wave generation adjusting device of central station, and be arranged at the signal receiving device on each terminal use, wherein: carrier wave generation adjusting device produces frequency comb and selects the carrier wave that energy is identical to modulate OFDM data, simultaneously according to the corresponding number of sub carrier wave of demand assignment of the terminal use's of each node unlike signal bit rate, ofdm signal processing unit be the corresponding modulation format of OFDM data selection and corresponding forward error correction coding and by OFDM Data Modulation on carrier wave and transfer to the signal receiving device on each terminal use.
2. system according to claim 1, is characterized in that, described modulation format specifically refers to the modulation format of the high-order that quadrature amplitude modulation produces, and comprising: QPSK, 8 ?QAM, 16 ?QAM or 32 ?QAM.
3. system according to claim 1, it is characterized in that, described forward error correction coding specifically refer to different code checks in moral ?Saloman coding or cascade RS coding repeatedly, by selecting different code checks to coordinate different planispheres to count, thus Signal coding and the pattern for different OFDM data selection corresponding signals, transmitted.
4. according to the system described in claim 1,2 or 3; it is characterized in that; the transmission form of described OFDM data is strong modulation and direct-detection; OFDM Data Modulation is used on carrier wave time Han meter Er Te symmetrical; and between carrier wave and OFDM data, add protection sideband, in OFDM data, add Cyclic Prefix simultaneously.
5. system according to claim 4, it is characterized in that, described carrier wave generation adjusting device comprises: external modulator, the first wavelength-selective switches, the first MZ Mach-Zehnder and the second wave length selector switch of the cascade of connecting successively, wherein: the external modulator of cascade comprises: second MZ Mach-Zehnder of connecting successively and the clock radio frequency signals drive circuit of phase-modulator and two kinds of modulators, the prevention at radio-frequency port of the first described MZ Mach-Zehnder is connected with the output of ofdm signal processing unit.
6. system according to claim 4, it is characterized in that, described signal receiving device comprises: dispersion compensation module, filter, photodetector and the OFDM digit receiver of connecting successively, wherein: OFDM receiver is converted to digital information by the OFDM data that receive, and with this through clock synchronous, signal equalization, removal Cyclic Prefix, fast Fourier transform, and sequence of binary signals after string changes, demapping is encoded, carry out again the decode operation of forward error correction coding, thereby recover, need the data message transmitting to compile.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104734783A (en) * | 2015-04-13 | 2015-06-24 | 天津理工大学 | Arbitrary waveform light pulse generator |
| CN113489546A (en) * | 2021-06-29 | 2021-10-08 | 上海电力大学 | Multi-user dual-band transceiver design method suitable for PON 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 |
| WO2023124402A1 (en) * | 2021-12-31 | 2023-07-06 | 华为技术有限公司 | Point-to-multipoint optical communication method, apparatus, and system |
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| 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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Patent Citations (3)
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| 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) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734783A (en) * | 2015-04-13 | 2015-06-24 | 天津理工大学 | Arbitrary waveform light pulse generator |
| CN104734783B (en) * | 2015-04-13 | 2017-08-15 | 天津理工大学 | A kind of random waveform optical pulse generator |
| CN113489546A (en) * | 2021-06-29 | 2021-10-08 | 上海电力大学 | Multi-user dual-band transceiver design method suitable for PON system |
| WO2023124402A1 (en) * | 2021-12-31 | 2023-07-06 | 华为技术有限公司 | Point-to-multipoint optical communication method, apparatus, 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 |
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