CN102638434A - OFDMA (orthogonal frequency division multiple access)-based fusion access network system - Google Patents

OFDMA (orthogonal frequency division multiple access)-based fusion access network system Download PDF

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CN102638434A
CN102638434A CN 201210086031 CN201210086031A CN102638434A CN 102638434 A CN102638434 A CN 102638434A CN 201210086031 CN201210086031 CN 201210086031 CN 201210086031 A CN201210086031 A CN 201210086031A CN 102638434 A CN102638434 A CN 102638434A
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optical
ofdma
ofdm
signal
central node
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CN 201210086031
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CN102638434B (en )
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张崇富
张琼丽
陈晨
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电子科技大学
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Abstract

The invention discloses an OFDMA (orthogonal frequency division multiple access)-based fusion access network system. A core network is connected with a user terminal by means of an OFDMA single-fiber ring and a plurality of OFDMA single-fiber trees, so that a metropolitan area network and an access network are effectively fused together. Simultaneously, when the OFDMA single-fiber ring is practically configured, central nodes in corresponding number can be increased in an existing OFDMA single-fiber ring according to practical needs of the user terminal, and addition by the means has no influence on normal operation of other configured central nodes, therefore, the OFDMA-based fusion access network system is excellent in expansibility and flexibility, and can adapt to the trend of ever-increasing network information capacity in modern society.

Description

—种基于OFDMA的融合接入网系统 - kind of access network system integration based on OFDMA

技术领域 FIELD

[0001] 本发明属于光通信技术领域,更为具体地讲,涉及一种基于OFDMA的融合接入网系统。 [0001] The present invention belongs to the field of optical communication technology, more particularly, to an access network-based fusion OFDMA system.

背景技术 Background technique

[0002] 近年来,随着通信容量的快速增大、通信业务的日益丰富、通信应用需求的灵活多样,传统的城域网与接入网独立通信模式已经不能适应当前飞速发展的通信网络现状,也已经不能满足人们对不断膨胀的网络信息的巨大需求,因而寻求一种能够解决上述问题的新型网络体系结构已成为未来城域网与接入技术领域所面临的重大挑战。 [0002] In recent years, with the rapid increase in communication capacity, communication services increasingly rich and flexible communications application requirements of diverse traditional metro and access network independent status of the communication mode can not adapt to the current rapid development of communications network , has also been unable to meet the huge demand for people's ever-expanding network of information, and thus to find a new network architecture can solve these problems has become a major challenge for metropolitan area networks and access technologies facing the sector in the future. 随着新一代信息网络产业被列为“十二五”重点战略性新兴产业,中国制订了国家宽带发展计划,逐渐开始走向了新一代信息网络产业的探索之路。 With the new generation of information network industry is listed as the "second five" key strategic emerging industries, China has developed a national broadband development plans, gradually began to explore the road of a new generation of information network industry.

[0003] 传统的城域网与接入网是独立分开进行通信的,城域网主要实现高带宽业务的承载、交换、分配等功能,而接入网则主要实现业务数据的远端接入功能。 [0003] The traditional access network is a metropolitan area network and communicate independently and separately, to achieve major metropolitan carry high bandwidth services, exchange and distribution functions, and the access network are mainly implemented data access teleservice Features. 为了顺应网络扁平化、业务融合承载的下一代互联网发展需求,城域网与接入网的融合与统一已经是必然的发展趋势。 In order to conform to the flat network, bearer of the next generation Internet business integration development needs, MAN and integration with unified access network is an inevitable trend. 将城域网与接入网相融合,突破传统的城域网与接入网的独立通信模式,可以达到能效利用最优化、传输通道透明化、网络集成化的目标,从而极大的降低了建设成本,同时促进了低碳网络和绿色通信技术的发展。 The MAN access network integration, breaking the traditional MAN access network independent of the communication mode, can be optimized to achieve efficient use of energy, transparent transmission channel, network integration target, thereby greatly reducing the construction costs, while promoting the development of low-carbon and green network communication technology.

[0004]正交频分复用(Orthogonal Frequency-Division Multiple,简称OFDM)技术是一种多载波调制技术,其采用几百个甚至是几千个窄带子载波进行高速数据传输,其中每个子载波承载了相应的比特数据,它们之间是相互正交的。 [0004] Orthogonal Frequency Division Multiplexing (Orthogonal Frequency-Division Multiple, referred to as OFDM) technology is a multi-carrier modulation technique that uses hundreds or even thousands of narrowband subcarriers high speed data transmission, wherein each subcarrier carrying corresponding data bit, among which are orthogonal to each other.

[0005]正交频分多址(Orthogonal Frequency Division Multiple Access,简称0FDMA)是以OFDM为基础的,通过给每个用户分配一定数量的子载波来实现多用户接入。 [0005] Orthogonal Frequency Division Multiple Access (Orthogonal Frequency Division Multiple Access, referred to as OFDMA) is OFDM-based, multi-user access is achieved by allocating a certain number of sub-carriers to each user. OFDMA除了继承OFDM的优点之外,还具有非常灵活的分配机制,可以根据用户业务量的大小动态分配子载波的数量,并且可以在不同的子载波上使用不同的调制和编码方式以及发射功率来减少干扰,增加系统容量;同时,基于OFDM的调制技术不仅是实现高频谱利用率的有效方法,而且具有抵抗色散和偏振模色散能力,因此,采用该技术能够满足未来光网络的宽带接入和低成本需求。 In addition to inheriting OFDMA advantage of OFDM, but also a very flexible allocation mechanism, according to the number of subcarriers dynamically size the user traffic and may use different modulation and coding scheme and transmit power on different subcarriers reduce interference and increase system capacity; the same time, based on the OFDM modulation method is effective not only to achieve a high frequency efficiency, and has resistance to chromatic dispersion and polarization mode dispersion capability, and therefore, the use of this technology to meet future optical broadband access network and low-cost needs.

[0006] 欧洲的FP7研究项目提出了一种城域网与接入网的融合方案,S卩“ ScalabIeAdvanced Ring-based passive Dense Access Network Architecture(SARDANA),,。在该方案中,集中采用了波分复用(Wavelength Division Multiplexing,简称WDM)和时分多址(Time Division Multiple Access,简称TDMA)这两种技术来构建城域网与接入网融合系统,对于N个环形节点,选用2N个波长来进行双向传输和交换,并最终以时分复用(Time-Division Multiplexing,简称TDM)的方式将信号接入到用户终端。该融合方案的特点在于它能够很好的与现有的技术标准相匹配以及能够很容易地在现有的通信基础设施上面进行升级,但是面向更长远的网络发展需求来看,该融合方案存在交换接入的灵活性较低、TDM对时间同步要求苛刻、长程传输受色散等影响大等不足。[0007] 另外,在2009年(美国光学学会Optical Society of America)召开的光纤通 [0006] European FP7 research project proposes a metropolitan area network and access network integration programs, S Jie "ScalabIeAdvanced Ring-based passive Dense Access Network Architecture (SARDANA) ,,. In this scheme, concentrated using a wave division multiplexing (wavelength division multiplexing, referred to as WDM) and time division multiple access (Time division multiple Access, referred to as TDMA) technology to build two MAN access network integration system for the annular nodes N, 2N wavelength selection switching and bidirectional transmission is performed, and finally time-division multiplexing (Time-Division Multiplexing, referred to as TDM), the access mode signal to the user terminal. characteristics of the fusion scheme is that it can be very good with a standard prior art and matching can be easily performed in the above conventional communication infrastructure upgrades, but for more long-term network development demands, the presence of fusion less flexible program switched access, the TDM time-demanding synchronization requirements, long-range transmission fiber dispersion, by and large lack of impact. [0007] in addition, (optical Society of America optical Society of America) was held in 2009 信OFC会议上,美国NEC实验的Wei Wei等人提出了一种基于OFDMA环技术的新型城域网系统,即基于动态子载波分配的光OFDMA城域网(An Optical OFDMA Metro Ring Networkwith Dynamic Sub-carrier Allocation),该城域网系统利用OFDMA中的子载波动态分配技术很好地实现了信息交换和分配的灵活性,实现了高的频谱利用率和灵活性,让我们充分享受了光学系统传输的透明性和巨大的带宽。同时,由于该城域网系统对灵活的QoS的支持,使得节点的结构也相对地简单和有效。但该方案仅仅是对城域网的改进,没有涉及如何与接入网融合。 Letter OFC Conference, U.S. experimental NEC Wei Wei et al proposed a new OFDMA based MAN system loop technique, which is based on dynamic light OFDMA subcarrier allocation of MAN (An Optical OFDMA Metro Ring Networkwith Dynamic Sub- carrier allocation), the MAN system utilizes OFDMA subcarrier allocation technique of dynamic to achieve a good flexibility of information exchange and distribution, to achieve a high spectrum efficiency and flexibility, allowing us to fully enjoy the optical transmission system transparency and enormous bandwidth. also, since the system MAN flexible QoS support, such that the node structure is relatively simple and effective, but the improvement schemes are merely MAN, and does not involve how access network integration.

发明内容 SUMMARY

[0008] 本发明的目的在于克服现有技术的不足,提供一种基于OFDMA的融合接入网系统,使城域网与接入网得到有效融合,同时具有可扩展、高灵活以及低成本的性能。 [0008] The object of the present invention is to overcome the disadvantages of the prior art, to provide an access network system of the OFDMA-based fusion, metro and access networks that the effective fusion, while having scalable, high flexibility and low cost performance.

[0009] 为实现上述发明目的,本发明基于OFDMA的融合接入网系统,其特征在于包括:连接核心网和用户终端的一个OFDMA单纤环和若干个OFDMA单纤树; [0009] In order to achieve the above object, the present invention is an access network system is based on the fusion of OFDMA, comprising: connecting a single fiber ring OFDMA core network and a plurality of user terminals and a single fiber OFDMA trees;

[0010] OFDMA单纤环包括一个中心局CO和n个中心节点CNi,其中,i = 1,2,. . .,n ;中心局CO与中心节点CN i、中心节点CN」_与下一个中心节点CN」+1以及中心节点CNn与中心局CO之间都由一条与连接方向相同的单向传输的光纤连接,其中,j = 1,2,...,nl ; [0010] OFDMA single fiber ring includes a central office CO and n center nodes CNi, wherein, i = 1,2 ,., n;.. The central office CO and the central node CN i, the central node CN "to the next _ the central node CN "+1 and an optical fiber connected to the same by a connecting direction between a central node and the central office CO CNn way transmission, where, j = 1,2, ..., nl;

[0011] 中心局CO与核心网直接相连,负责将来自核心网的数据组装成适合各个中心节点CN i传输和交换的格式,并加载子载波,即调制,然后进行快速傅里叶逆变换、上变频变换、数/模变换和电/光变换,得到光OFDM信号,得到的光OFDM信号沿传OFDMA单纤环传输和下载:在中心节点CN—i中,对输入的光OFDM信号通过分束器分成两路,一路经过光/电转换、模/数转换变成电域的数字信号,这个数字信号经过下变频后接着进行快速傅里叶变换,得到子载波信号,然后,选择该节点对应的子载波信号进行解调,解调后进行子载波动态分配,选择新的子载波进行调制,调制后进行快速傅里叶逆变换,最后进行上变频并通过数/模和电/光转换变成下行光OFDM信号,另一路经过光放大器放大后,通过与下一个中心节点CN i+1连接的单向传输的光纤传给下一个中心节点CN i+1 ; [0011] directly connected to the central office CO to the core network, data from the core network is responsible for assembling into a format suitable for each central switching nodes CN i and the transmission, and load subcarriers, i.e. modulated, then Inverse Fast Fourier Transform, frequency up conversion, digital / analog conversion and the electrical / optical conversion, to obtain an optical OFDM signal, the OFDM signal obtained in the optical transmission OFDMA single fiber ring and downloading: central node CN-i, the optical signal input through the OFDM sub the beam is divided into two, all the way through optical / electrical conversion, analog / digital conversion of the electrical domain into a digital signal, the digital signal is then downconverted after the fast Fourier transform, to give the sub-carrier signal, and then, select the node corresponding subcarrier signal is demodulated subcarrier demodulation dynamic allocation, selecting a new sub-carrier modulation, inverse fast Fourier transform modulated, upconverted and finally through a digital / analog and electrical / optical conversion into downstream optical OFDM signal, the other optical amplifier after passage through the optical fiber with the unidirectional transmission CN i + 1 at a central node connected passed to the next central node CN i + 1;

[0012] OFDMA单纤树为用双向单纤,通过耦合器连接将某一个中心节点CN」与其对应若干个远端节点,即用户终端而构成的树形结构,负责将中心节点CN」输出的下行光OFDM信号长距离传送到各个用户终端,同时将来自各个用户终端的光OFDM信号反馈到中心节点CNi,构成上行光OFDM信号;该树形结构是基于OFDM长距离无源光网络(Passive OpticalNetwork,简称P0N)的特点来设计的; [0012] OFDMA tree single fiber bidirectional single fiber, through the coupler is connected to one central node CN "corresponding to a plurality of remote nodes, the tree structure is constituted of a user terminal, is responsible for the central node CN" output downstream optical OFDM signal transmitted over long distances to the respective user terminals, while the respective optical OFDM signal from the user terminal back to the central node CNi, constituting the upstream optical OFDM signal; the tree structure is based on OFDM long distance passive optical network (passive OpticalNetwork , referred P0N) features designed;

[0013] 在中心节点CN」中,上行光OFDM信号经过光/电转换、模/数转换变成电域的数字信号,这个数字信号经过下变频后接着进行快速傅里叶变换,得到子载波信号并进行解调,解调后进行子载波动态分配,选择新的子载波进行调制,调制后进行快速傅里叶逆变换,最后进行上变频并通过数/模和电/光转换变成新的上行光OFDM信号;该新的上行光OFDM信号通过耦合器耦合到单向传输的光纤上; [0013] In the central node CN ", the uplink optical OFDM signal through optical / electrical conversion, analog / digital conversion of the electrical domain into a digital signal, the digital signal is then downconverted after the fast Fourier transform, to give the sub-carriers inverse fast Fourier transform to demodulate the signal and performs dynamic allocation of demodulation subcarriers, selecting a new sub-carriers modulated with, and finally up-converted by D / a and electrical / optical conversion into a new upstream optical OFDM signal; the new OFDM signal is coupled to the upstream optical transmission fiber through the one-way coupler;

[0014] 在中心局CO中,对来自各个中心节点CNj的新的上行光OFDM信号进行处理后,发送到核心网。 [0014] In the central office CO.'s, the new OFDM signals from the respective upstream optical CNj central node for processing, to the core network.

[0015] 本发明的发明目的是这样实现的:[0016] 本发明基于OFDMA的融合接入网系统,通过OFDMA单纤环和若干个OFDMA单纤树将核心网和用户终端连接起来,使城域网与接入网有效融合在一起。 [0015] The invention object of the present invention is implemented as follows: [0016] access network system of the present invention, the fusion based on OFDMA, OFDMA single fiber ring and by a plurality of monofilaments tree OFDMA core network and the user terminals connected together, so that the city domain network and access network effectively together. 同时,在实际配置OFDMA单纤环的时候,可以根据用户终端的实际需求在现有的OFDMA单纤环中增加相应数目的中心节点,这样的添加不会影响其他已经配置好的中心节点的正常工作,因而,具有非常好的扩展性和灵活性,能够适应当今社会网络信息容量日益增长的趋势。 Meanwhile, when the actual configuration OFDMA single fiber loop can be increased in a corresponding number of conventional OFDMA central node according to the actual needs of a single fiber ring of a user terminal, such addition will not affect the other normal central node has been configured work, therefore, has a very good scalability and flexibility to adapt to today's social network information capacity growing trend.

[0017] 同时,本发明基于OFDMA的融合接入网系统还具有以下有益效果: [0018] (I)、通过使用OFDMA技术以及子载波的选取,实现了城域网与接入网的无缝融合,突破了传统上城域网与接入网独立通信的模式; [0017] Meanwhile, the present invention is an OFDMA-based fusion access network system further has the following advantages: [0018] (I), by using an OFDMA techniques and selecting sub-carriers, to achieve the metro and access networks seamlessly integration, breaking the traditional mode of communication with the independent metropolitan area network connection;

[0019] (2)、中心节点中使用OFDMA技术,与欧洲的FP7研究项目提出的SARDANA结构相t匕,更具灵活性,且实现了高的频谱利用率。 [0019] (2), the central node using OFDMA technology, SARDANA structure proposed by the European FP7 research project with t dagger, more flexible, and to achieve a high spectral efficiency. 同时,从中心节点到用户终端使用OFDMA技术实现远端接入,这样在实现高灵活性的同时对同步的要求也降低了,能够适应网络通信容量与日俱增的大趋势; Meanwhile, from a central node to the user terminal remote access (OFDMA), so that high flexibility while achieving synchronization requirements are reduced, can adapt to the trend of increasing the capacity of the communication network;

[0020] (3)、使用OFDMA技术实现从中心节点到用户终端的远端接入,与美国NEC实验等提出的OFDMA城域环相比,扩展了网络结构,实现了城域网和接入网的无缝融合,与城域网和接入网单独发展建设相比,大大的简化了网络结构,节约了成本,使得网络的集成化程度更高。 [0020] (3), the use of OFDMA access technology from the central node to the remote user terminal, compared to the US NEC ring experiments proposed OFDMA metro, expanded network structure, and access to achieve the MAN seamless integration of networks, metro and access networks as compared to a separate development and construction, greatly simplifies the network structure, cost savings, so that a higher degree of integration network.

附图说明 BRIEF DESCRIPTION

[0021] 图I是本发明基于OFDMA的融合接入网系统一种具体实施方式架构图; [0021] Figure I is an access network system of the present invention to a specific embodiment of the architecture of FIG OFDMA-based fusion;

[0022] 图2是图I所示中心节点一种具体实施方式结构图; [0022] FIG. 2 is a diagram of a particular embodiment of the central node configuration shown in Figure I;

[0023] 图3是图I所示用户终端一种具体实施方式结构图。 [0023] FIG. 3 is a diagram of a particular embodiment of a user terminal configuration shown in FIG. I.

具体实施方式 detailed description

[0024] 下面结合附图对本发明的具体实施方式进行描述,以便本领域的技术人员更好地理解本发明。 [0024] DETAILED DESCRIPTION OF THE DRAWINGS Embodiment of the present invention will be described so that others skilled in the art better understand the present invention. 需要特别提醒注意的是,在以下的描述中,当已知功能和设计的详细描述也许会淡化本发明的主要内容时,这些描述在这里将被忽略。 Need to remind noted that in the following description, when a detailed description of known functions and design may dilute the main content of the present invention, the description here will be ignored.

[0025] 实施例 [0025] Example

[0026] 为了方便描述,先对具体实施方式中出现的相关专业术语进行说明: [0026] For convenience of description, the first of the relevant terminology occurred embodiment will be described:

[0027] OFDM (Orthogonal Frequency Division Multiplexing):正交频分复用; [0027] OFDM (Orthogonal Frequency Division Multiplexing): orthogonal frequency-division multiplexing;

[0028] OFDMA(Orthogonal Frequency Division Multiple Access):正交频分多址接 [0028] OFDMA (Orthogonal Frequency Division Multiple Access): Orthogonal Frequency Division Multiple Access

A ; A;

[0029] CO (Central Office):中心局; [0029] CO (Central Office): the central office;

[0030] CN (Central Node):中心节点; [0030] CN (Central Node): the central node;

[0031] RN (Remote Node):远端节点; [0031] RN (Remote Node): remote node;

[0032] FFT (Fast Fourier Transform):快速傅里叶变换; [0032] FFT (Fast Fourier Transform): a fast Fourier transform;

[0033] IFFT (Inverse Fast Fourier Transform):快速傅里叶逆变换; [0033] IFFT (Inverse Fast Fourier Transform): Inverse Fast Fourier Transform;

[0034] PD(Photodiode):光电二极管; [0034] PD (Photodiode): photodiode;

[0035] RSOA(Reflective Semiconductor Optical Amplifier):反射式半导体光放大器;[0036] 图I是本发明基于OFDMA的融合接入网系统一种具体实施方式架构图。 [0035] RSOA (Reflective Semiconductor Optical Amplifier): reflective semiconductor optical amplifier; [0036] Figure I is an access network system of the present invention to a specific embodiment of the architecture of FIG OFDMA-based fusion.

[0037] 在本实施例中,如图I所示,本发明基于OFDMA的融合接入网系统中连接核心网和用户终端的是一个OFDMA单纤环和若干个OFDMA单纤树。 [0037] In the present embodiment, as shown in FIG. I, the present invention is connected to a core network and a user terminal integration access network OFDMA system is based on a single fiber ring and a plurality of OFDMA OFDMA monofilaments tree. 需要说明的是,为了简洁,只给出了两根OFDMA单纤树,即与中心节点CN」、中心节点CN」相连接的OFDMA单纤树,其余中心节点的OFDMA单纤树予以了省略。 Note that, for simplicity, shows only two tree OFDMA monofilaments, i.e., the central node CN ", the central node CN OFDMA monofilament tree" connected, OFDMA monofilament remaining central node tree be omitted.

[0038] 如图I所示,OFDMA单纤环包括一个中心局CO和n个中心节点CN」,其中,i = 1,2,. . .,n ;中心局CO与中心节点CN」、中心节点CNj与下一个中心节点CN」+1以及中心节点0&与中心局CO之间都由一条与连接方向相同的单向传输的光纤连接,n为中间节点的个数。 [0038] As shown in FIG. I, OFDMA single fiber ring includes a central office CO and the central node CN n ", wherein, i = 1,2 ,., n;.. The central office CO to the central node CN" Center the connection between the optical fiber and the central node 0 +1 & CO central Office by the same one node CNj connecting direction with the next central node CN "one-way transmission, n is an intermediate node number. 在本实施例中,在单向传输的光纤中的光OFDM信号沿图I所示的方向从中心局CO到中心节点CN」,然后到中心节点CN2依次传输,再返回中心局CO。 In the present embodiment, as shown in the direction I of the one-way transmission optical fiber along the OFDM signal from the central office CO to the central node CN ", and then sequentially transmitted to the central node CN2, and then return to the central office CO.

[0039] 数据由核心网流向用户终端的方向为下行方向,而数据由用户终端流向核心网的方向则为上行方向。 The direction of [0039] data flow by the core network user terminal in the downlink direction, and the direction of data flow by a core network user terminal uplink compared.

[0040] 如图I所示,OFDMA单纤环中的中心局CO与核心网直接相连,中心局CO负责将来自核心网的数据组装成适合各个中心节点CN」传输和交换的格式,并加载子载波,即调制,然后进行快速傅里叶逆变换、上变频变换、数/模变换和电/光变换,得到光OFDM信号,得到的光OFDM信号沿传OFDMA单纤环传输和下载。 [0040] FIG I, the central office CO OFDMA single fiber loop connected directly with the core network, the central office CO is responsible for the data from the core network node CN assembled into a format suitable for "each transport and switching center, and loading subcarrier, i.e. the modulation, and inverse fast Fourier transform, frequency up conversion, digital / analog conversion and the electrical / optical conversion, to obtain an optical OFDM signal, the OFDM signal obtained in the optical transmission OFDMA single fiber loop transmission and download. 而各个中心节点CNi则可以分布在OFDMA单纤环中的任意位置,负责传输和下载来自核心网以及需要上传到核心网的光OFDM信号。 CNi central node and each of the OFDMA may be distributed at any position in a single fiber ring, responsible for transmitting and downloading from the core network and an optical OFDM signal to be uploaded to the core network. 每个中心节点都携带了所有的来自核心网的数据,即光OFDM信号包含有所有的来自核心网的数据。 Each central node carries all the data from the core network, i.e., an optical OFDM signal contains all the data from the core network. 在本实施例中,光OFDM信号的子载波为单一波长。 In the present embodiment, subcarrier optical OFDM signal is a single wavelength.

[0041] 在实际配置OFDMA单纤环的时候,可以根据远端用户,即用户终端的实际需求在现有的OFDMA环中增加相应数目的中心节点,这样的添加不会影响其他已经配置好的中心节点的正常工作,因而本发明的基于OFDMA的融合接入网系统具有非常好的扩展性,能够适应当今社会网络信息容量日益增长的趋势。 [0041], can, i.e. the actual needs of user terminals increases when an actual single fiber loop configuration OFDMA remote user in accordance with a conventional OFDMA ring in a corresponding number of central node, such addition does not affect other already configured work center node, thus OFDMA-based access network systems integration has very good scalability to adapt to the present invention in today's information society network capacity growing trend.

[0042] 如图I所示,OFDMA单纤树为用双向单纤,通过耦合器连接将某一个中心节点CNi与其对应若干个远端节点,即用户终端而构成的树形结构,负责将中心节点CN」输出的下行光OFDM信号长距离传送到各个用户终端,同时将来自各个用户终端的光OFDM信号反馈到中心节点CN」,构成上行光OFDM信号。 [0042] FIG I in the tree structure as tree OFDMA single fiber bidirectional single fiber by a coupler connected to a central node number CNi corresponding remote node, i.e. the user terminal is configured, the center is responsible for CN "output node of the downstream optical OFDM signal transmitted over long distances to the respective user terminals, while the respective optical OFDM signal fed back from the user terminals to the central node CN", constituting the upstream optical OFDM signal.

[0043] 图2是图I所示中心节点一具体实施方式结构图。 [0043] FIG. 2 is a diagram of a particular embodiment of the central node configuration shown in FIG. I.

[0044] 如图2所示,在本实施例中,在中心节点CN」中,对输入的光OFDM信号通过分束器分成两路。 [0044] 2, in the present embodiment, the central node CN ", the input of the optical OFDM signal is divided into two by the beam splitter. 一路经过光/电转换、模/数转换变成电域的数字信号,这个数字信号经过下变频后接着进行快速傅里叶变换,即IFFT变换,得到子载波信号,然后,选择该节点对应的子载波信号进行解调,解调后进行子载波动态分配,选择新的子载波进行调制,调制后进行快速傅里叶逆变换,最后进行上变频并通过数/模和电/光转换变成下行光OFDM信号,然后通过OFDMA单纤树传送到各个用户终端;另一路经过光放大器放大后,通过与下一个中心节点CN i+1连接的单向传输的光纤传给下一个中心节点CN i+1。 All the way through optical / electrical conversion, analog / digital conversion of the electrical domain into the digital signal, the digital signal is then downconverted after the fast Fourier transform, i.e. IFFT transformation, sub-carrier signals, and then, select the node corresponding to inverse fast Fourier transformed subcarrier signal is demodulated subcarrier demodulation dynamic allocation, selecting a new sub-carriers modulated with, and finally up-converted by D / a and electrical / optical conversion into downstream optical OFDM signal, and then transmitted to the user terminal through the respective monofilaments OFDMA tree; the other optical amplifier after passage through the optical fiber with the unidirectional transmission to the next CN i + 1 connected to the central node in a central node CN i pass +1.

[0045] 来自各个用户终端的光OFDM信号反馈到中心节点CN」,构成上行光OFDM信号。 [0045] The optical OFDM signal feedback from each user terminal to the central node CN ", constituting the upstream optical OFDM signal. 在中心节点CNi中,上行光OFDM信号经过光/电转换、模/数转换变成电域的数字信号,这个数字信号经过下变频后接着进行快速傅里叶变换,得到子载波信号并进行解调,解调后进行子载波动态分配,选择新的子载波进行调制,调制后进行快速傅里叶逆变换,最后进行上变频并通过数/模和电/光转换变成新的上行光OFDM信号;该新的上行光OFDM信号通过耦合器耦合到单向传输的光纤上。 CNi central node, the upstream optical signal through OFDM optical / electrical converter, analog / digital conversion of the electrical domain into a digital signal, the digital signal is then downconverted after the fast Fourier transform, subcarrier signal obtained solution and inverse fast Fourier transform after the transfer, dynamic allocation of subcarrier demodulation, selecting a new sub-carriers modulated with, and finally up-converted by D / a and electrical / optical conversion into a new upstream optical OFDM signal; the new OFDM signal is coupled to the upstream optical transmission fiber through the one-way coupler.

[0046] 图3是图I所示用户终端一种具体实施方式结构图。 [0046] FIG. 3 is a diagram of a particular embodiment of a user terminal configuration shown in FIG. I.

[0047] 在本实施例中,如图3所示,远端节点RN就是用户终端,与OFDMA单纤树直接相连,包括: [0047] In the present embodiment, as shown in FIG. 3, the remote node RN is the user terminal, directly connected with the tree OFDMA single fiber, comprising:

[0048] —光稱合器,用于将下行光OFDM信号分为两束; [0048] - said optical coupler, for downstream optical OFDM signal into two beams;

[0049] 一光电探测器以及OFDM解调器,将光耦合器分出的一束下行光OFDM信号送入光电探测器中进行光电转换,得到的电OFDM信号送入OFDM解调器中解调,得到用户需要的下行数据; [0050] 一OFDM调制器,OFDM调制器对上行数据进行调制,得到上行OFDM信号; [0049] a photodetector and an OFDM demodulator, a bundle of optical coupler separated downstream optical OFDM signal into a photodetector photoelectrically converted to obtain an electrical signal into the OFDM demodulator OFDM demodulated , the user needs to obtain the downlink data; [0050] an OFDM modulator, an OFDM modulator for modulating the uplink data, to obtain an upstream OFDM signal;

[0051] 一反射式半导体光放大器,光耦合器分出来的一束下行光OFDM信号进入反射式半导体光放大器RS0A,从而擦除该光OFDM信号上携带的下行OFDM信号,产生纯净的上行光载波,然后输入到反射式半导体光放大器RSOA中,将上行OFDM信号加载到产生的纯净的上行光载波上形成上行光OFDM信号,再通过光耦合器将上行光OFDM信号传送到OFDMA单纤树中。 [0051] a reflective semiconductor optical amplifier, an optical coupler out of a bundle of optical OFDM downlink signals enter the reflective semiconductor optical amplifier RS0A, thereby erasing a downlink OFDM signal carried on the optical OFDM signal to generate the upstream optical carrier of pure and then inputted to the reflective semiconductor optical amplifier RSOA, the load on the uplink OFDM signal to the upstream optical pure form upstream optical carriers generated OFDM signal transmitted through the optical coupler upstream optical signal to the OFDM OFDMA monofilaments tree.

[0052] 在本实施例中,用户终端最大的特点就是其无源性, [0052] In the present embodiment, the user terminal biggest feature is its passivity,

[0053] 尽管上面对本发明说明性的具体实施方式进行了描述,以便于本技术领域的技术人员理解本发明,但应该清楚,本发明不限于具体实施方式的范围,对本技术领域的普通技术人员来讲,只要各种变化在所附的权利要求限定和确定的本发明的精神和范围内,这些变化是显而易见的,一切利用本发明构思的发明创造均在保护之列。 [0053] While on the face of specific embodiments illustrative of the present invention has been described in order to understand the present invention, it is to be understood that the invention is not limited to the scope of particular embodiments of ordinary skill in the art to those skilled in the art speaking, within the spirit and scope of the invention as variations in the appended claims is defined and determined, and these changes will be apparent, all using the concepts of the present invention are inventions in the protection column.

Claims (3)

  1. 1. 一种基于OFDMA的融合接入网系统,其特征在于包括:连接核心网和用户终端的一个OFDMA单纤环和若干个OFDMA单纤树; OFDMA单纤环包括一个中心局CO和η个中心节点CNi,其中,i = 1,2, ...,η ;中心局CO与中心节点CN」、中心节点CN」_与下一个中心节点CN」+1以及中心节点CNn与中心局CO之间都由一条与连接方向相同的单向传输的光纤连接,其中,J = 1,2,...,nl ; 中心局CO与核心网直接相连,负责将来自核心网的数据组装成适合各个中心节点CN」传输和交换的格式,并加载子载波,即调制,然后进行快速傅里叶逆变换、上变频变换、数/模变换和电/光变换,得到光OFDM信号,得到的光OFDM信号沿传OFDMA单纤环传输和下载:在中心节点CN」中,对输入的光OFDM信号通过分束器分成两路,一路经过光/电转换、模/数转换变成电域的数字信号,这个数字信号经过下变频后接着 An access network system based on an OFDMA fusion, comprising: a core network and a user terminal connected to the single fiber loop and a plurality of OFDMA OFDMA monofilament trees; OFDMA single fiber ring includes a central office CO and a η CNi central node, wherein, i = 1,2, ..., η; the central office CO to the central node CN ", the central node CN" _ next central node CN and '+1 and CNn central node and the central office CO by a fiber optic connection between the same connecting direction of the one-way transmission, wherein, J = 1,2, ..., nl; directly connected to the central office CO to the core network, responsible for the data from the core network to suit each assembly CN "transmission format and exchange center node, and load subcarriers, i.e., modulation, and inverse fast Fourier transform, frequency up conversion, digital / analog conversion and the electrical / optical conversion, to obtain an optical OFDM signal, OFDM light obtained OFDMA signal transmission along single fiber ring and downloading: the central node CN ", the input of the optical OFDM signal is divided into two by the beam splitter, all the way through optical / electrical conversion, analog / digital conversion of the digital signals into the electrical domain this digital signal is then downconverted after 行快速傅里叶变换,得到子载波信号,然后,选择该节点对应的子载波信号进行解调,解调后进行子载波动态分配,选择新的子载波进行调制,调制后进行快速傅里叶逆变换,最后进行上变频并通过数/模和电/光转换变成下行光OFDM信号,另一路经过光放大器放大后,通过与下一个中心节点CN i+1连接的单向传输的光纤传给下一个中心节点CN i+1 ; OFDMA单纤树为用双向单纤,通过耦合器连接将某一个中心节点CN」与其对应若干个远端节点,即用户终端而构成的树形结构,负责将中心节点CN」输出的下行光OFDM信号长距离传送到各个用户终端,同时将来自各个用户终端的光OFDM信号反馈到中心节点CNi,构成上行光OFDM信号;该树形结构是基于OFDM长距离无源光网络(Passive OpticalNetwork,简称PON)的特点来设计的; 在中心节点CN」中,上行光OFDM信号经过光/电转换、模 Fast Fourier row after fast Fourier transform, to give the sub-carrier signal, and then, select the node corresponding to sub-carrier signals is demodulated subcarrier demodulation dynamic allocation, selecting a new sub-carriers modulated with an inverse transform, and finally up-converted by D / a and electrical / optical conversion into a downstream optical OFDM signal, the other optical amplifier after passage through the next central node CN i + 1 unidirectional transmission connection of fiber-optic to the next central node CN i + 1; OFDMA tree single fiber bidirectional single fiber, through the coupler is connected to one central node CN "corresponding to a plurality of remote nodes, i.e. the subscriber terminal constituting the tree structure responsible the optical OFDM downlink signal the central node CN "is outputted to the long distance transmission of the respective user terminals, while the respective optical OFDM signal from the user terminal back to the central node CNi, constituting the upstream optical OFDM signal; the tree structure is based on OFDM long distance features PON (passive OpticalNetwork, referred to as PON) is designed; central node CN ", the uplink optical OFDM signal through optical / electrical conversion, analog /数转换变成电域的数字信号,这个数字信号经过下变频后接着进行快速傅里叶变换,得到子载波信号并进行解调,解调后进行子载波动态分配,选择新的子载波进行调制,调制后进行快速傅里叶逆变换,最后进行上变频并通过数/模和电/光转换变成新的上行光OFDM信号;该新的上行光OFDM信号通过耦合器耦合到单向传输的光纤上; 在中心局CO中,对来自各个中心节点CN」的新的上行光OFDM信号进行处理后,发送到核心网。 A / D converter into a digital signal in the electrical domain, after the digital signal is then downconverted fast Fourier transform, subcarrier signal and demodulates subcarrier demodulation dynamic allocation, selecting a new sub-carriers modulation, modulated inverse fast Fourier transform, and finally up-converted by D / a and electrical / optical conversion into a new upstream optical OFDM signal; the new upstream optical OFDM signal is coupled to one-way transmission through the coupler on the optical fiber; in the central office CO.'s, the new OFDM signals from the respective upstream optical center node CN "are processed to the core network.
  2. 2.根据权利要求I所述的基于OFDMA的融合接入网系统,其特征在于,所述的OFDM信号的子载波为单一波长。 The fusion OFDMA-based access network system according to claim I, wherein the sub-carriers of the OFDM signal to a single wavelength.
  3. 3.根据权利要求I所述的基于OFDMA的融合接入网系统,其特征在于,所述的用户终端包括: 一光稱合器,用于将下行光OFDM信号分为两束; 一光电探测器以及OFDM解调器,将光耦合器分出的一束下行光OFDM信号送入光电探测器中进行光电转换,得到的电OFDM信号送入OFDM解调器中解调,得到用户需要的下行数据; 一 OFDM调制器,OFDM调制器对上行数据进行调制,得到上行OFDM信号; 一反射式半导体光放大器,光耦合器分出来的一束下行光OFDM信号进入反射式半导体光放大器RS0A,从而擦除该光OFDM信号上携带的下行OFDM信号,产生纯净的上行光载波,然后输入到反射式半导体光放大器RSOA中,将上行OFDM信号加载到产生的纯净的上行光载波上形成上行光OFDM信号,再通过光耦合器将上行光OFDM信号传送到OFDMA单纤树中。 The fusion OFDMA-based access network system according to claim I, wherein the user terminal comprises: a said optical combiner, for downstream optical OFDM signal into two beams; a photodetection and an OFDM demodulator, a bundle of optical coupler separated into downstream optical OFDM signal subjected to photoelectric conversion in the photodetector, to give an electrical signal into the OFDM demodulator OFDM demodulation, the downlink user needs to give transactions; an OFDM modulator, an OFDM modulator for modulating the uplink data, to the uplink OFDM signal; a reflective semiconductor optical amplifier, an optical coupler out of a bundle of optical OFDM downlink signals enter the reflective semiconductor optical amplifier RS0A, thereby wiping in addition to carrying the optical OFDM signal in the downlink OFDM signal, generating pure upstream optical carrier, and then input into the reflective semiconductor optical amplifier RSOA, an upstream OFDM signal loading is formed upstream optical OFDM signal to a pure upstream optical carriers generated, then optical OFDM uplink OFDMA signal is transmitted to the tree by a single fiber optical coupler.
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