基于误判比特最小化的高维映射技术研究

发布时间：2018-06-02 00:02

本文选题：光通信 + 高维调制　；参考：《吉林大学》2017年硕士论文

【摘要】：随着全球通信技术的飞跃发展以及高清视频、赛事直播、云共享、联机游戏、视频会议等带宽耗尽型业务的快速普及,网络带宽的需求以每年1.6倍的速度迅猛增长。在以物联网、大数据为技术引导的智能化生活不断推广的趋势下,信息化社会对于光纤通信网络的带宽需求势必超过有史以来的任何一个阶段,如何在不增加干线重建成本的基础上向大容量升级是当前光纤通信系统面临的主要问题之一。采用高阶调制格式是提高系统容量的有效手段。然而,谱效率和功率效率是一对矛盾体,高阶调制格式虽然具有较高的谱效率,但功率效率却因此而下降。在同样的发射功率和目标误码率下,较小的功率效率将会导致系统的传输距离变短。为了解决这一问题,高维调制格式应运而生。高维调制格式可以同时利用光场中的频率、模式、时隙、偏振态等多个自由度对信号进行调制,增加的自由度可以最大化星座点间的最小欧式距离,进而增大信号的功率效率,较好地解决现有二维调制格式中谱效率与功率效率相互制约的问题,使长距离光纤通信系统的实现成为了可能。高维调制格式可以利用现行的通信传输网络,在不改变已有光通信系统结构的基础上,只需在发送端转换信号的调制格式,并利用接收端数字信号处理技术即可提升系统性能,大大节约了通信成本。因此,研究高维调制格式具有十分重要的意义。在这一背景下,本文对高维调制四大关键技术之一的高维映射技术进行了探索与研究,提出了一种基于误判比特最小化的高维映射技术。论文主要工作如下:首先,从当前通信业务发展的趋势出发,详细阐述了研究高维调制格式的重要意义,并依据国内外高维调制格式的发展脉络,对所取得的研究成果做出了系统的总结。其次,介绍了高维调制格式的基本概念和主要参数,重点介绍了渐进功率效率和谱效率两个参数。从实现原理与实现步骤两方面对高维调制格式的实现方法做出了分析与归纳,并从原理、性能以及硬件实现方式等角度对三种常见的高维调制格式进行了分析。再次,基于近几年高维调制格式的研究现状,对高维调制格式的主要技术及每种技术的解决方案进行了详细的说明与分析,主要包括高维选点技术、高维映射技术、高维信号的解调技术和高维信号的数字信号处理技术。然后,针对已有高维映射研究中存在的问题,提出了一种基于误判比特最小化的高维映射技术。详细介绍了理论模型的建立过程,并推导了代价函数的理论上下限,给出了代价函数曲线图。并给出了基于误判比特最小化的高维映射的一般步骤,为该映射技术的应用提供了坚实的理论基础。最后,以VPI-MATLAB联合仿真平台为依托,搭建了高维调制仿真系统。仿真验证了误判比特最小化高维映射技术的性能,并与随机映射进行了对比。对六种四维调制格式与六种八维调制格式的误码率进行了详细的分析,仿真结果充分证明了误判比特最小化高维映射方式的优良性能。
[Abstract]:With the rapid development of global communication technology and the rapid popularization of high definition video, live broadcast, cloud sharing, online games, video conferencing and other bandwidth depletion services, the demand for network bandwidth is growing at a rate of 1.6 times a year. Under the trend of the continuous popularization of the intelligent life guided by the Internet of things and large data, the information society The bandwidth requirement of the optical fiber communication network is bound to exceed any of the historical stages. It is one of the main problems in the current optical fiber communication system that how to upgrade the capacity of the optical fiber communication system without increasing the cost of the trunk reconstruction. The high order modulation format is an effective means to improve the capacity of the system. However, spectral efficiency and power efficiency are also used. The rate is a pair of contradictory bodies. Although the high order modulation format has high spectral efficiency, the power efficiency is reduced. At the same transmission power and target error rate, the smaller power efficiency will lead to the shorter transmission distance of the system. Using the frequency, mode, time slot and polarization state in the optical field to modulate the signal, the increased degree of freedom can maximize the minimum Euclidean distance between the constellation points, and then increase the power efficiency of the signal, and better solve the problem that the spectral efficiency and power efficiency in the existing two-dimensional modulation format are restricted to each other, so that long distance fiber communication is made. The realization of the signal system is possible. The high dimensional modulation format can make use of the current communication transmission network. On the basis of the structure of the optical communication system, it only needs to convert the modulation format of the signal at the sending end, and uses the receiver digital signal processing technology to improve the performance of the system and greatly save the communication cost. Therefore, the study of the communication cost is greatly saved. The high dimensional modulation format is of great significance. In this context, this paper explores and studies the high dimensional mapping technology of one of the four key technologies of high dimensional modulation, and proposes a high dimensional mapping technology based on the minimization of misjudged bits. The main work of this paper is as follows: first, from the trend of the current communication service development, the main work of this paper is detailed. The significance of the study of high dimensional modulation format is elaborated, and according to the development of high dimensional modulation format at home and abroad, the research results obtained are summarized systematically. Secondly, the basic concepts and main parameters of the high dimensional modulation format are introduced, and the two parameters of the progressive work efficiency and spectral efficiency are introduced, and the principle and the implementation principle are introduced. The realization of the high dimensional modulation format is analyzed and summarized in the two party, and the three common high dimensional modulation formats are analyzed from the principle, the performance and the hardware implementation. Thirdly, based on the research status of the high dimensional modulation format in recent years, the main technology and the solution of each technology in the high dimensional modulation format are solved. The scheme is explained and analyzed in detail, including high dimensional point selection, high dimensional mapping, high dimensional signal demodulation and high dimensional signal processing. Then, a high dimensional mapping technique based on the minimization of misjudged bits is proposed. The theoretical model is established and the theoretical and lower limits of the cost function are derived. The graph of the cost function is given. The general step of the high dimensional mapping based on the minimization of misjudged bits is given, which provides a solid theoretical basis for the application of the mapping technology. Finally, the high dimension modulation is built on the basis of the VPI-MATLAB joint simulation platform. Simulation system is used to verify the performance of misjudged bit minimization high dimensional mapping technology and compare with random mapping. The error rate of six four dimensional modulation formats and six eight dimensional modulation formats is analyzed in detail, and the simulation results fully demonstrate the excellent performance of misjudged bit minimization and high dimensional mapping.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.3

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