XGPON协议分析仪中FEC及其相关技术的研究与实验

发布时间：2018-10-24 20:33

【摘要】：随着新兴业务的迅猛发展和人们对接入设备的要求持续增长,接入网对带宽、业务支持能力及接入设备性能等提出了更高要求,目前广泛应用的接入网技术已不能满足未来接入网发展的需要。因此,下一代PON技术的研究与应用已成为势在必行的技术发展方向,其中XGPON是下一代接入网优选方案之一。XGPON关键技术及核心设备的研究与开发对促进XGPON技术发展与应用尤为重要。就此,本文基于XGPON协议体系及基本原理,研究与开发出了一款实时接收及解析XGPON网络协议报文的协议分析仪,并针对物理适配子层尤其是前向纠错技术进行了重点的研究和讨论。具体工作内容如下：1. XGPON协议分析仪物理适配子层部分模块的逻辑功能实现,完成XGPON系统的上/下行帧接收及解析功能,具体涉及内容包括LVDS接收、比特位调整、帧对齐、四倍过采样、位宽转换、帧同步和解扰等模块。2.基于RME算法原理实现了一种适用于XGPON的前向纠错译码方式,实现了XGPON系统中FEC块传输周期内的实时译码,其包括伴随式计算、关键方程求解、Chien搜索及Forney算法等模块。3.研究了一种基于XGPON协议的下行自适应前向纠错技术,根据XGPON传输系统的误码率选择开启或关闭FEC功能,用自适应FEC的方式在通信系统的传输质量和传输效率中找到最佳平衡点。4.最后,给出了XGPON协议分析仪开发工具及测试平台,并对物理适配子层各模块进行了调试和验证。本文设计的协议分析仪支持XGPON系统上行/下行信号同时接收,并对所接收到的报文进行解析和纠错后重新封装成以太帧并发送到PC端进行调试。经过多种不同环境下进行的测试,最终的实验结果表明该XGPON协议分析仪具有极其稳定的性能,通过前向纠错处理后的报文极少出现误码及丢帧情况,达到了实际工程应用的技术要求。
[Abstract]:With the rapid development of new services and the continuous growth of people's requirements for access equipment, the access network has put forward higher requirements for bandwidth, service support ability and access equipment performance. At present, the widely used access network technology can not meet the needs of the future access network development. Therefore, the research and application of next generation PON technology has become an imperative technology development direction. Among them, XGPON is one of the best schemes for next generation access network. The research and development of XGPON key technology and core equipment is especially important to promote the development and application of XGPON technology. In this paper, based on the XGPON protocol system and its basic principle, a protocol analyzer for real-time receiving and parsing XGPON network protocol packets is studied and developed. The physical adaptation sublayer, especially the forward error correction technology, is studied and discussed. The specific contents of the work are as follows: 1. The logic function of the physical adaptation sub-layer module of the XGPON protocol analyzer is realized, and the functions of receiving and parsing the upper / downlink frames of the XGPON system are completed, including LVDS reception, bit adjustment, frame alignment, four-fold oversampling, bit width conversion, etc. Frame synchronization and descrambling module. 2. Based on the principle of RME algorithm, a forward error correction decoding method suitable for XGPON is implemented, and the real-time decoding of FEC block in XGPON system is realized. It includes the following modules: concomitant computation, key equation solving, Chien searching and Forney algorithm. In this paper, a downlink adaptive forward error correction technique based on XGPON protocol is studied. According to the error rate of XGPON transmission system, the function of FEC is turned on or off, and the best balance point between the transmission quality and transmission efficiency of the communication system is found by adaptive FEC. 4. Finally, the development tools and test platform of XGPON protocol analyzer are given, and the modules of physical adaptation layer are debugged and verified. The protocol analyzer designed in this paper supports the uplink / downlink signals of the XGPON system to receive simultaneously, and parses and corrects the received packets, then re-encapsulates them into Ethernet frames and sends them to the PC for debugging. The final experimental results show that the XGPON protocol analyzer has a very stable performance, and the error rate and frame loss are rarely seen after the forward error correction processing. Meet the technical requirements of practical engineering application.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.1

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