【作者】 赵鹏；

【导师】 徐伟；

【作者基本信息】 哈尔滨工程大学 ， 光学工程， 2013， 硕士

【摘要】 21世纪是光的时代。随着通信技术飞速发展，人们对接入网带宽的需求也越来越高。由于光接入网技术的不断创新，下一代光接入网技术OFDM-PON (Orthogonal FrequencyDivision Multiplexing-Passive Optical Network)已经得到行业的广泛关注和认可，OFDM-PON的带宽分配技术是其众多关键技术中的重中之重，而带宽分配算法是带宽分配技术的核心。相对于结构简单的静态带宽分配方式，动态带宽分配方式能根据用户的需求实时的改变带宽分配情况，更充分的利用带宽，保证用户间的公平性。本课题是以OFDM-PON系统为研究对象，对其传输性能、动态带宽分配算法进行了研究。首先，对OFDM光纤传输系统进行了研究。将射频OFDM和光OFDM做比较，分析光OFDM的传输特性。用MATLAB软件将OFDM光纤信道传输进行了建模并仿真，观察不同传输参数的改变对系统传输性能的影响。同时对信道估计进行了具体研究，仿真并分析了信道估计在传输过程中的重要性，验证了OFDM在光纤传输中的可行性，得到了OFDM光纤传输特性。其次，对传统CP算法进行了研究。从算法流程、分配方式对算法原理进行了介绍，并分析其不足之处。将传统CP算法应用到OFDM-PON系统中，用OPNET网络仿真软件对OFDM-PON进行建模，对传统CP算法进行仿真。通过改变EF、AF、BE业务的负载量，观察不同类型业务的时延特性。并将仿真结果进行分析，得到OFDM-PON系统在应用传统CP算法下的传输特性。最后，将传统CP算法进行了改进，对改进算法进行了研究。改进算法从上传业务方式、ONU内分配方式两个方面对传统CP算法进行了改进。将改进算法应用到OFDM-PON系统中，并对其进行了建模。通过改变EF、AF、BE业务的负载量，观察系统的带宽利用率和不同业务类型的时延特性。将仿真结果与传统CP算法的仿真结果作对比，得到了OFDM-PON系统在应用改进算法下的传输特性，并体现了改进算法的优越性。更多还原

【Abstract】 The21st century is the century of light. With the rapid development of communicationtechnology, people have more demand on the access network bandwidth. Because of the rapidinnovation in optical networks, the next generation optical network OFDM-PON has beenextensive attention and recognition in the industry. The bandwidth allocation technology forOFDM-PON is the most important in its key technologies, and the bandwidth allocationalgorithm is the core technology of the bandwidth allocation. Relative to the static bandwidthallocation with simple structure, dynamic bandwidth allocation can change the bandwidthallocation according to the needs of users in time, utilizing the bandwidth more fully, toensure the fairness between users. This subject is based on OFDM-PON system as theresearch object, researching on its transmission performance and dynamic bandwidthallocation algorithm.Firstly, the OFDM optical fiber transmission system is researched. The RF OFDM andthe optical OFDM are in comparison, analyzing the transmission characteristics of opticalOFDM. Model and simulate OFDM fiber channel transmission by using MATLAB software,to observe the impact of transmission performance by changing different parameters of thetransmission system. At the same time, channel estimation is researched, simulating andanalyzing the importance of the channel estimation in the transmission process, to verify thefeasibility of the OFDM transmission in the optical fiber, to obtain the transmissioncharacteristics of OFDM optical fiber transmission.Secondly, traditional CP algorithm is researched. Introduce the algorithm principle byalgorithmic process and distribution style, and analyze its inadequacies. Apply the traditionalCP algorithm to OFDM-PON system, using OPNET network simulation software to modelOFDM-PON system and simulate traditional CP algorithm. By changing the EF, AF, BEbusiness load, observe the delay characteristic of the different types of business. Analyze theresults of simulation, to obtain the transmission characteristics of OFDM-PON system usingtraditional CP algorithm.Finally, the traditional CP algorithm is improved, and improved algorithm is researched.The improved algorithm is improved from the traditional CP algorithm by the uploadingbusiness style and internal ONU allocation style. Apply the improved algorithm to OFDM-PON system and model the system. By changing the EF, AF, BE business load,observe the system link utilization and delay characteristics of the different types of business.Compare the simulation results with the simulation results of traditional CP algorithm, toobtain the transmission characteristics of the OFDM-PON system using improved algorithm,reflecting the superiority of the improved CP algorithm.更多还原