长距离电力线载波通信数字前端技术  

Digital Front End Technology for Long-Distance Power Line Communication

作　　者：高鸿坚 谢宏伟[3] 陆旭 刘瑶 张力军 曹阳[3] GAO Hongjian;XIE Hongwei;LU Xu;LIU Yao;ZHANG Lijun;CAO Yang(State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China;Electric Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory,Beijing 102209,China;State Grid East Inner Mongolia Electric Power Co.,Ltd.,Hohhot 010020,China)

机构地区：[1]国网智能电网研究院有限公司,北京102209 [2]国家电网公司电力智能传感技术及应用联合实验室,北京102209 [3]国网内蒙古东部电力有限公司,内蒙古呼和浩特010020

出　　处：《中国电力》2023年第3期128-136,共9页Electric Power

基　　金：国家电网有限公司科技项目(面向智能感知的HPLC深化应用技术研究与应用,5700-202027173A-0-0-00);国网蒙东电力有限公司科技项目(超长距电力线载波通信技术在用电信息采集系统应用研究,SGMD0000YXJS 1900600)。

摘　　要：电力线载波通信(PLC)信道不是专门为通信而设计的,因此在PLC信道中通常存在较大的噪声和干扰。通过配置模拟前端(analog front end,AFE)参数可以滤除不同频率的信道噪声和干扰,但这会增加电路设计难度和硬件成本。基于等效复数基带(equivalent complex baseband,ECB)和奈奎斯特加窗技术,提出了一种新的数字前端(digital front end,DFE)结构,接收端加窗技术不仅能够有效地抑制频带外窄带干扰,消除相邻频段PLC系统或无线系统的影响,而且能够降低模拟前端的复杂性,节约设计成本。仿真结果表明:通过奈奎斯特窗,有利于把带内窄带干扰能量集中在较少的子载波上,便于窄带干扰的检测和消除,提高系统的性能。通过现场测试,进一步验证了所提出的数字前端技术的有效性。Since the power line communication(PLC)channel is not specifically designed for communication,there usually exists a large noise and/or a strong interference around the frequency band of a PLC system.It is not economical to change the structure of the analog front end(AFE)to improve the performance of the PLC system.Therefore,based on the equivalent complex baseband and Nyquist windowing technology,a new digital front end(DFE)structure is proposed.The windowing at the receiver end can not only effectively suppress the out-of-band narrowband interference and eliminate the impact of adjacent frequency PLC systems or wireless systems,but also reduce the complexity of the AFE and save design costs.The simulation results show that the Nyquist windowing is better for concentrating the energy of narrowband interference to the less subcarriers,which is convenient for detection and elimination of the narrowband interference,thus improving the performance of the system.In addition,the effectiveness of the proposed DFE technology is further verified through field tests.

关 键 词：电力线载波通信 物理层 数字前端 等效复数基带 加窗技术 

分 类 号：TM73[电气工程—电力系统及自动化] TN913.6[电子电信—通信与信息系统]