常规的电力线载波技术在规定的频带范围采用固定的工作频率通信,不能适应复杂、时变、差异性的电网信道特性,通信性能和业务保障差。为提高面向智能电网应用的电力线载波通信技术的可靠性、灵活性与覆盖率,满足智能配用电业务通信需求,...常规的电力线载波技术在规定的频带范围采用固定的工作频率通信,不能适应复杂、时变、差异性的电网信道特性,通信性能和业务保障差。为提高面向智能电网应用的电力线载波通信技术的可靠性、灵活性与覆盖率,满足智能配用电业务通信需求,提出一种基于信道认知在线可定义的电力线载波通信方法,使载波通信可根据中低压配电网电力线信道实际情况,在150 k Hz^10 MHz跨频带范围内自适应选择合适的工作频率和通信带宽。从而打破传统电力线载波通信工作频率窄带和宽带的分割,实现基于信道认知结果的电力线载波通信参数"在线定义"。在给出所提出方法实现架构的基础上,着重探讨基于等效复数基带和收发端双加窗的数字前端、基于无线电信号接收因子的中短波电台检测、以及前导序列辅助下的频率选择等关键技术。仿真和现场实际测试证明了所提电力线载波通信方法的有效性,通过节点自主认知信道环境并自适应选择工作频率,提高了载波通信链路的可靠性和单跳覆盖率,对未来电力线载波技术在智能电网中的应用具有推动作用。展开更多
Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)s...Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.展开更多
电力线信道噪声干扰是影响电力线通信(power line communication,PLC)的主要因素,为了研究电力线信道噪声的统计特性,以采集的场测噪声数据为依据,在时域和频域分析了低压电力线信道的噪声特性,并以此为基础,利用统计的方法建立了窄带...电力线信道噪声干扰是影响电力线通信(power line communication,PLC)的主要因素,为了研究电力线信道噪声的统计特性,以采集的场测噪声数据为依据,在时域和频域分析了低压电力线信道的噪声特性,并以此为基础,利用统计的方法建立了窄带噪声和脉冲噪声模型。通过实测噪声的统计特性对所建噪声模型进行优化,对电力线信道噪声的统计特性进行了计算和仿真。结果表明,所建立的电力线信道噪声模型与采集的实际噪声相比,时域波形几乎一致,而在频域上误差小于8.51%,从而验证了所建立模型的有效性。展开更多
为了解决低压高速电力线通信(power line communication,PLC)网络电磁辐射准确测量的问题,研制一套基于球形探头的近场电场测量系统。从理论上分析球形探头的场强变换原理,设计测量系统,并获得了变换因子的表达式。研究进一步提高测量...为了解决低压高速电力线通信(power line communication,PLC)网络电磁辐射准确测量的问题,研制一套基于球形探头的近场电场测量系统。从理论上分析球形探头的场强变换原理,设计测量系统,并获得了变换因子的表达式。研究进一步提高测量系统灵敏度的方法,设计高输入阻抗的电压跟随电路。通过大量的试验进行验证,得到了测量系统在1～30MHz频率范围内所能测量PLC网络电磁辐射场强的范围,研究表明,在现有PLC网络电磁辐射限值下,该近场电场测量系统能够满足测量要求。展开更多
文摘常规的电力线载波技术在规定的频带范围采用固定的工作频率通信,不能适应复杂、时变、差异性的电网信道特性,通信性能和业务保障差。为提高面向智能电网应用的电力线载波通信技术的可靠性、灵活性与覆盖率,满足智能配用电业务通信需求,提出一种基于信道认知在线可定义的电力线载波通信方法,使载波通信可根据中低压配电网电力线信道实际情况,在150 k Hz^10 MHz跨频带范围内自适应选择合适的工作频率和通信带宽。从而打破传统电力线载波通信工作频率窄带和宽带的分割,实现基于信道认知结果的电力线载波通信参数"在线定义"。在给出所提出方法实现架构的基础上,着重探讨基于等效复数基带和收发端双加窗的数字前端、基于无线电信号接收因子的中短波电台检测、以及前导序列辅助下的频率选择等关键技术。仿真和现场实际测试证明了所提电力线载波通信方法的有效性,通过节点自主认知信道环境并自适应选择工作频率,提高了载波通信链路的可靠性和单跳覆盖率,对未来电力线载波技术在智能电网中的应用具有推动作用。
文摘Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.
文摘电力线信道噪声干扰是影响电力线通信(power line communication,PLC)的主要因素,为了研究电力线信道噪声的统计特性,以采集的场测噪声数据为依据,在时域和频域分析了低压电力线信道的噪声特性,并以此为基础,利用统计的方法建立了窄带噪声和脉冲噪声模型。通过实测噪声的统计特性对所建噪声模型进行优化,对电力线信道噪声的统计特性进行了计算和仿真。结果表明,所建立的电力线信道噪声模型与采集的实际噪声相比,时域波形几乎一致,而在频域上误差小于8.51%,从而验证了所建立模型的有效性。
文摘为了解决低压高速电力线通信(power line communication,PLC)网络电磁辐射准确测量的问题,研制一套基于球形探头的近场电场测量系统。从理论上分析球形探头的场强变换原理,设计测量系统,并获得了变换因子的表达式。研究进一步提高测量系统灵敏度的方法,设计高输入阻抗的电压跟随电路。通过大量的试验进行验证,得到了测量系统在1～30MHz频率范围内所能测量PLC网络电磁辐射场强的范围,研究表明,在现有PLC网络电磁辐射限值下,该近场电场测量系统能够满足测量要求。
