XGPON協(xié)議分析儀中FEC及其相關技術的研究與實驗
[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.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TN929.1
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