Abstract： Real-time digital service and mul- timedia service upstream transmission in Dig- ital Signal Processing （DSP）-based Orthogo- nal Frequency Division Multiplexing-Passive Optical Network （OFDM-PON） is exp...Abstract： Real-time digital service and mul- timedia service upstream transmission in Dig- ital Signal Processing （DSP）-based Orthogo- nal Frequency Division Multiplexing-Passive Optical Network （OFDM-PON） is experimen- tally demonstrated with Centralised Light Sou- rce （CLS） configuration in this paper. After transmitted over 25 km Standard Single Mode Fibre （SSMF） with -16.5 dBm optical power at receiver, the Bit Error Rate （BER） is 9.5 ×10^-11. The implementations of digital domain up-conversion and down-conversion based on Field Programmable Gate Array （FPGA） are int- roduced, which can reduce the cost of In-ph- ase and Quadrature （IQ） radio frequency mix- ers utilised at transmitter and receiver. A car- rier synchronization algorithm is implemented for compensating carrier offset. A channel eq- ualization algorithm is adopted for compen- sating the damage of channel. A new structure of Frequency Synchronization Unit （FSU） des- igned in FPGA is also proposed to cope with the frequency shifting at receiver.展开更多
同步数字体系(Synchronous Digital Hierarchy,SDH)光纤传输网在电力通信中扮演着至关重要的角色。光纤传输网凭借其高带宽、大容量以及高可靠性的特性,已成为电力通信的骨干网络技术。该技术支持电力系统的远程控制、实时监测以及灾难...同步数字体系(Synchronous Digital Hierarchy,SDH)光纤传输网在电力通信中扮演着至关重要的角色。光纤传输网凭借其高带宽、大容量以及高可靠性的特性,已成为电力通信的骨干网络技术。该技术支持电力系统的远程控制、实时监测以及灾难恢复等关键功能,显著提高了电力系统的运行效率和服务质量。通过分析SDH技术的基本概念、建设流程及其在电力通信中的应用,揭示SDH光纤传输网对于电力系统稳定运行的重要贡献,并对其未来发展趋势进行展望。展开更多
同步数字体系(Synchronous Digital Hierarchy,SDH)光纤通信网络中的故障类型繁多,具体包括硬件故障、软件故障、配置错误以及光缆故障等。每种故障类型都有其独特的表现形式和原因,故障现象与原因之间的关联性难以确定,导致SDH光纤通...同步数字体系(Synchronous Digital Hierarchy,SDH)光纤通信网络中的故障类型繁多,具体包括硬件故障、软件故障、配置错误以及光缆故障等。每种故障类型都有其独特的表现形式和原因,故障现象与原因之间的关联性难以确定,导致SDH光纤通信网络故障分类难度较大,为此提出基于支持向量回归(Support Vector Regression,SVR)的SDH光纤通信网络故障分类方法。基于泊松分布的故障数据传输稳态特征分布模型提取故障特征,结合故障特征向量与SVR分类SDH光纤通信网络故障。实验测试结果表明,该方法可以实现快速收敛,且分类准确率达到99.0%以上,实际应用效果好。展开更多
基金ACKNOWLEDGEMENT This work was supported in part by the Na- tional Natural Science Foundation of China under Grants No. 61271192, No. 60932004 the National High Technology Research and Development of China （863 Program） under Grant No. 2013AA013401 and the National Basic Research Program of China under Grant No. 2013CB329204.
文摘Abstract： Real-time digital service and mul- timedia service upstream transmission in Dig- ital Signal Processing （DSP）-based Orthogo- nal Frequency Division Multiplexing-Passive Optical Network （OFDM-PON） is experimen- tally demonstrated with Centralised Light Sou- rce （CLS） configuration in this paper. After transmitted over 25 km Standard Single Mode Fibre （SSMF） with -16.5 dBm optical power at receiver, the Bit Error Rate （BER） is 9.5 ×10^-11. The implementations of digital domain up-conversion and down-conversion based on Field Programmable Gate Array （FPGA） are int- roduced, which can reduce the cost of In-ph- ase and Quadrature （IQ） radio frequency mix- ers utilised at transmitter and receiver. A car- rier synchronization algorithm is implemented for compensating carrier offset. A channel eq- ualization algorithm is adopted for compen- sating the damage of channel. A new structure of Frequency Synchronization Unit （FSU） des- igned in FPGA is also proposed to cope with the frequency shifting at receiver.
文摘同步数字体系(Synchronous Digital Hierarchy,SDH)光纤传输网在电力通信中扮演着至关重要的角色。光纤传输网凭借其高带宽、大容量以及高可靠性的特性,已成为电力通信的骨干网络技术。该技术支持电力系统的远程控制、实时监测以及灾难恢复等关键功能,显著提高了电力系统的运行效率和服务质量。通过分析SDH技术的基本概念、建设流程及其在电力通信中的应用,揭示SDH光纤传输网对于电力系统稳定运行的重要贡献,并对其未来发展趋势进行展望。
文摘同步数字体系(Synchronous Digital Hierarchy,SDH)光纤通信网络中的故障类型繁多,具体包括硬件故障、软件故障、配置错误以及光缆故障等。每种故障类型都有其独特的表现形式和原因,故障现象与原因之间的关联性难以确定,导致SDH光纤通信网络故障分类难度较大,为此提出基于支持向量回归(Support Vector Regression,SVR)的SDH光纤通信网络故障分类方法。基于泊松分布的故障数据传输稳态特征分布模型提取故障特征,结合故障特征向量与SVR分类SDH光纤通信网络故障。实验测试结果表明,该方法可以实现快速收敛,且分类准确率达到99.0%以上,实际应用效果好。
