MB-OFDM UWB技术在多模光纤中的应用研究
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摘要
MB-OFDM UWB作为当今UWB两大主流标准之一，融合了OFDM和UWB两大技术优势，可以满足现今人们对通信提出的高质量、高带宽、高速率的要求。多模光纤不但具有高带宽、低衰落、抗干扰性能好等诸多优点，还在实际应用中具有操作简单、节约工程成本的巨大优势。将MB-OFDM UWB技术与多模光纤技术结合研究，旨在实现两种技术的优势互补，具有很高的研究及应用价值。
本文分别从以下几方面对课题进行了研究和阐述：
（1）介绍了UWB技术的发展历程，研究了MB-OFDM UWB的基本原理和关键技术。
（2）对多模光纤的相关理论进行了概括，着重对多模光纤模式色散原理进行了阐述和分析。多模光纤的模式色散问题是影响多模光纤传输性能的最主要因素，所以MB-OFDM UWB技术能否很好的应用在多模光纤中，最重要的是要看它能否很好的克服多模光纤的模式色散。
（3）结合MB-OFDM UWB技术特点从理论上分析证明了该技术具有较好克服多模光纤的模式色散的能力。为了使理论分析更具说服力，本文应用MATLAB和Optisystem仿真软件搭建了实验仿真平台，通过对比实验相关数据，验证了MB-OFDM UWB技术确实能够较好的克服多模光纤的模式色散，从而说明了将MB-OFDM UWB技术应用在多模光纤中是可行的。
（4）通过学习和研究多模光纤通信系统知识发现，系统中存在的非线性失真问题制约着MB-OFDM UWB信号的可靠传输，因此本文对光纤系统非线性问题进行了分析。并针对其中的MZ调制器非线性调制问题进行了深入的研究，并提出了利用PAPR抑制算法对MB-OFDM UWB信号进行调整来解决上述问题的方法，并通过仿真实验证明了该方法的正确性。
MB-OFDM UWB is one of the UWB two mainstream standards, the technologycontains the OFDM and the UWB two major technologies' advantages, can satisfythe nowadays people's requirements to the communication, which are highcommunication quality, high bandwidth, the high bit rate. Multimode fiber not onlyhas high bandwidth and low decline, anti-jamming performance good, and many otheradvantages, but also has simple operation, low cost of the enormous advantage inpractical application. The research of MB-OFDM UWB technology under themultimode fiber, the aim is to realize the complementary advantages of the twotechnologies. Therefore, the subject has a very high research and application value.
This article mainly has the following several aspects:
(1) This paper introduced the UWB technology development history, studied theMB-OFDM UWB basic principle and key technology.
(2) Introduced the multimode fiber related theory, mainly illustrated andanalyzed multimode fiber's mode dispersion principles. Mode dispersion problem isthe most main factors of multimode fiber transmission properties, so MB-OFDMUWB technology can be a good application in multimode fiber or not, the mostimportant is to see if it can be very good overcome multimode fiber dispersion of themodel.
(3) Theoretically proved the technology for multimode fiber mode dispersionhave very good resistance, which combined with MB-OFDM UWB technologycharacteristics. In order to make the theoretical analysis more convincing, this paperapply MATLAB and Optisystem simulation software built experimental simulationplatform, and the simulation results confirm the validity of the which illustrates theMB-OFDM UWB technology and multimode fiber combination is feasible.
(4) Through the study and research of multimode fiber communication systemknowledge, we know that existing of nonlinear distortion problem in the systemprevents MB-OFDM UWB signal's reliable transmission, so in this paper, weanalysed the nonlinear problems. And deeply research MZ modulator's nonlinearmodulation, and puts forward using PAPR suppression algorithm to adjustMB-OFDM UWB signal to solve the above problems, and through the experimentalsimulation results prove the feasibility of this method.
本文分别从以下几方面对课题进行了研究和阐述：
（1）介绍了UWB技术的发展历程，研究了MB-OFDM UWB的基本原理和关键技术。
（2）对多模光纤的相关理论进行了概括，着重对多模光纤模式色散原理进行了阐述和分析。多模光纤的模式色散问题是影响多模光纤传输性能的最主要因素，所以MB-OFDM UWB技术能否很好的应用在多模光纤中，最重要的是要看它能否很好的克服多模光纤的模式色散。
（3）结合MB-OFDM UWB技术特点从理论上分析证明了该技术具有较好克服多模光纤的模式色散的能力。为了使理论分析更具说服力，本文应用MATLAB和Optisystem仿真软件搭建了实验仿真平台，通过对比实验相关数据，验证了MB-OFDM UWB技术确实能够较好的克服多模光纤的模式色散，从而说明了将MB-OFDM UWB技术应用在多模光纤中是可行的。
（4）通过学习和研究多模光纤通信系统知识发现，系统中存在的非线性失真问题制约着MB-OFDM UWB信号的可靠传输，因此本文对光纤系统非线性问题进行了分析。并针对其中的MZ调制器非线性调制问题进行了深入的研究，并提出了利用PAPR抑制算法对MB-OFDM UWB信号进行调整来解决上述问题的方法，并通过仿真实验证明了该方法的正确性。
MB-OFDM UWB is one of the UWB two mainstream standards, the technologycontains the OFDM and the UWB two major technologies' advantages, can satisfythe nowadays people's requirements to the communication, which are highcommunication quality, high bandwidth, the high bit rate. Multimode fiber not onlyhas high bandwidth and low decline, anti-jamming performance good, and many otheradvantages, but also has simple operation, low cost of the enormous advantage inpractical application. The research of MB-OFDM UWB technology under themultimode fiber, the aim is to realize the complementary advantages of the twotechnologies. Therefore, the subject has a very high research and application value.
This article mainly has the following several aspects:
(1) This paper introduced the UWB technology development history, studied theMB-OFDM UWB basic principle and key technology.
(2) Introduced the multimode fiber related theory, mainly illustrated andanalyzed multimode fiber's mode dispersion principles. Mode dispersion problem isthe most main factors of multimode fiber transmission properties, so MB-OFDMUWB technology can be a good application in multimode fiber or not, the mostimportant is to see if it can be very good overcome multimode fiber dispersion of themodel.
(3) Theoretically proved the technology for multimode fiber mode dispersionhave very good resistance, which combined with MB-OFDM UWB technologycharacteristics. In order to make the theoretical analysis more convincing, this paperapply MATLAB and Optisystem simulation software built experimental simulationplatform, and the simulation results confirm the validity of the which illustrates theMB-OFDM UWB technology and multimode fiber combination is feasible.
(4) Through the study and research of multimode fiber communication systemknowledge, we know that existing of nonlinear distortion problem in the systemprevents MB-OFDM UWB signal's reliable transmission, so in this paper, weanalysed the nonlinear problems. And deeply research MZ modulator's nonlinearmodulation, and puts forward using PAPR suppression algorithm to adjustMB-OFDM UWB signal to solve the above problems, and through the experimentalsimulation results prove the feasibility of this method.
引文
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[2] A. P. Rahul, M. K. Joseph, P. B. Stephen. Compensation of multimodefiber dispersion using adaptive optics via convex optimization[J].Journal of Light wave Technology.2008,26(10):1295-1303.
[3]张阳安,李良川.多模光纤模间色散的电域均衡补偿.北京邮电大学学报,2007,30(5):95-99.
[4] P. Pepeljugoski, M. J. Haekert, J. S. Abbott, et al. Development ofsystem specification for laser optimized50um multimode fiber formulti gigabit short wavelength LAN[J]. Joumal Lightwave Technology.2003,21(5):1256-1275.
[5] S. Kanprachar, I. Jacobs. Bit rate and distance limitations of subcarrier multiplexing on multimode fiber[C]. CLEO2003:1651-1652.
[6] R. I. Klley, P. M. Watts, V. Mikhailov, et al. Electronic dispersioncompensation by signal predistortion using digital processing and adual-drive Mach-Zehnder modulator[J]. IEEE Photonics TechnologyLetters.2005,17(3):714-716.
[7]金显庆,许渤,邱昆.多模光纤通信中的自适应功率分配光OFDM技术[J].光电子·激光.2008,19(03):339-343.
[8]李良川,张阳安,徐大雄.10G以太网中多模光纤传输特性研究[J].光通信技术.2005.
[9] Maria-Gabriella Benedetto, Guerino Giancola.超宽带无线电基础[M].电子工业出版社,2005年.
[10]李长青. UWB-OFDM系统中若干关键技术的研究[D].北京邮电大学博士研究生学位论文.2006年.
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[13]Keiser G. Optical fiber communications[J]. Boston: McGraw-Hill.2000.
[14]A. P. Kannu, T. Sivanadyan. Performance of block adaptive modulationschemes for OFDM based WLAN systems[J]. In Proc. IEEE personalwireless communication.2002,11:6-10.
[15]Yuanrun Teng, Tomotaka Nagaosa. Grouping adaptive modulation methodfor burst mode OFDM transmission system[J]. In Proc. IEEE RENCON.2002,2(10):929-932.
[16]Tolga Kurt,Abbas Yongacoglu, Jean-Yves. OFDM and externallymodulated multi-mode fibers in radio over fiber systems[J].IEEETransactions on Wireless Communications,2006,5(10):2669-2674.
[17]Dixon B.J., Pollard, R.D. Iezekiel S. Orthogonal frequency-divisionmultiplexing in wireless communication systems with multimode fiberfeeds.[J]. IEEE Transactions on Microwave Theory and Techniques,2001,49(8):1404-1409.
[18]Kurt Tolga, Yongacoglu et.al. OFDM and externally modulatedmulti-mode fibers in radio over fiber systems[J]. IEEE Transactionson Wireless Communications,2006,5(10):2669-2674.
[19]Lowery, Arthur James, Armstrong et.al.10Gbit/s multimode fiber linkusing power-efficient orthogonal-frequency-divisionmultiplexing[J]. Optics Express,2005,13(25):10003-10009.
[20]Tang J.M., Lane, P.M., Shore K. Alan. High-speed transmission ofadaptively modulated optical OFDM signals over multimode fibers usingdirectly modulated DFBs[J]. Journal of Lightwave Technology,2006,24(1):429-441.
[21]Tang Jian Ming, Shore K. Allan. Maximizing the transmissionperformance of adaptively modulated optical OFDM signals inmultimode-fiber links by optimizing analog-to-digital converters[J].Journal of Lightwave Technology,2007,25(3):787-798.
[22]Tang, J.M., Lane P.M., Shore, K.A. Transmission performance ofadaptively modulated optical OFDM signals in multimode fiber links[J].IEEE Photonics Technology Letters,2006,18(1):205-207.
[23]Djordjevic Ivan B, Vasic Bane, Neifeld Mark A. LDPC-coded OFDM foroptical communication systems with direct detection[J]. IEEE Journalon Selected Topics in Quantum Electronics,2007,13(5):1446-1454.
[24]Xie Wei, Hu Guijun et.al. Application of Turbo codes in optical OFDMmultimode fiber communication system[J]. Optics Communications,2008,281(5):1118-1122.
[25]Roland Yuen, Xavier N. Fernando, Sridhar Krishnan. Radio overmultimode fiber for wireless access. Canadian Conference onElectrical and Computer Engineering[C].2004,3:1715-1718.
[26]付霞, OFDM系统同步技术研究[D].哈尔滨:哈尔滨工程大学,2008.
[27]张鑫, OFDM峰平比抑制关键技术研究[D].电子科技大学,2008.
[28]刘金全,陈华南,徐家品,基于PTS相位因子估计的PAPR抑制优化算法[D].成都:四川大学,2006.
[29]李光远,杨守义,穆晓敏,齐林,降低MIMO-OFDM系统PAPR的一种改进方法[J].微计算机信息,2007:86-88.
[30]柴丽敏,王向阳,潘志文,应用限幅降低OFDM系统的峰均比性能[J].电子工程师,2008:14-17.
[31]王兰勋,徐彬,任玉静,使用PTS和限幅联合算法降低OFDM峰均比[J].河北大学学报,2009:647-652.
[32]Cimini L J, Sollen berger N R. Peak-to-average power ratio reductionof an OFDM signal using partial transmit sequences[J]. IEEETransactions on Broadcasting,2000:86-88.
[33]高静,汪晋宽,解志斌,一种低复杂度的OFDM系统峰均比降低算法[D].东北大学,信息科学与工程学院,2009:522-525.
[34]Chen H. An orthogonal projection-based approach for PAPR reductionin OFDM [J]. IEEE Communication Letters,2002:169-171.
[35]R. G. Heung, I. J. Byoung, K. I. Bae. PAPR Reduction using SoftClipping and ACI Rejection in OFDM System[J]. IEEE Transactions onConsumer Electronic,2002,48(1):17-22.
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