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
在电力线载波通信中应用正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术需要进行频点的优选。在分析信道输入阻抗对电压传输特性影响的基础上,提出一种基于在线测量信道输入电抗的频点优选算法。首先在默认频点下...在电力线载波通信中应用正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术需要进行频点的优选。在分析信道输入阻抗对电压传输特性影响的基础上,提出一种基于在线测量信道输入电抗的频点优选算法。首先在默认频点下完成通信节点的入网,然后通过在线监测信道输入电抗筛选出部分频点,在这些频点处测试上、下行信号强度,通过简单计算优选频点作为子载波通道。以保定市实际中压配网为例进行仿真验证。仿真结果表明所提算法在保证通信质量前提下,可以筛选掉大量不可用频点,提高了频点优化速度。展开更多
首先介绍了中压电力线信道噪声通用模型,对现场采集的噪声进行互相关系数计算,并采用对称分量法进行相关性分析,得出三相电力系统相间噪声具有一定相关性的结论。改变单相传输模式,根据两相噪声的一致性特点,提出基于自适应最小均方误差...首先介绍了中压电力线信道噪声通用模型,对现场采集的噪声进行互相关系数计算,并采用对称分量法进行相关性分析,得出三相电力系统相间噪声具有一定相关性的结论。改变单相传输模式,根据两相噪声的一致性特点,提出基于自适应最小均方误差(least-mean-square error,LMS)算法实现中压电力线通信(medium voltage power line communication,MV-PLC)的噪声对消。自适应LMS算法虽然收敛速度较慢,但是计算量小,易于实现。仿真结果表明,噪声对消方法的采用有效改善了10kV中压电力线的信噪比,为10kV配网自动化系统采用载波通信技术提供了新的实现途径。展开更多
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.
文摘在电力线载波通信中应用正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术需要进行频点的优选。在分析信道输入阻抗对电压传输特性影响的基础上,提出一种基于在线测量信道输入电抗的频点优选算法。首先在默认频点下完成通信节点的入网,然后通过在线监测信道输入电抗筛选出部分频点,在这些频点处测试上、下行信号强度,通过简单计算优选频点作为子载波通道。以保定市实际中压配网为例进行仿真验证。仿真结果表明所提算法在保证通信质量前提下,可以筛选掉大量不可用频点,提高了频点优化速度。
文摘首先介绍了中压电力线信道噪声通用模型,对现场采集的噪声进行互相关系数计算,并采用对称分量法进行相关性分析,得出三相电力系统相间噪声具有一定相关性的结论。改变单相传输模式,根据两相噪声的一致性特点,提出基于自适应最小均方误差(least-mean-square error,LMS)算法实现中压电力线通信(medium voltage power line communication,MV-PLC)的噪声对消。自适应LMS算法虽然收敛速度较慢,但是计算量小,易于实现。仿真结果表明,噪声对消方法的采用有效改善了10kV中压电力线的信噪比,为10kV配网自动化系统采用载波通信技术提供了新的实现途径。
