一种OFDM电力线通信系统的自动增益控制方法  

A method of automatic gain control for OFDM PLC system

作　　者：周春良 王连成 迟海明 郝岩 唐晓柯 Zhou Chunliang;Wang Liancheng;Chi Haiming;Hao Yan;Tang Xiaoke(State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology,Beijing Smart-Chip Microelectronics Technology Co.,Ltd.,Beijing 100192,China;Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade,Beijing Smart-Chip Microelectronics Technology Co.,Ltd.,Beijing 100192,China)

机构地区：[1]北京智芯微电子科技有限公司国家电网公司重点实验室电力芯片设计分析实验室,北京100192 [2]北京智芯微电子科技有限公司北京市电力高可靠性集成电路设计工程技术研究中心,北京100192

出　　处：《信息技术与网络安全》2020年第1期74-77,82,共5页Information Technology and Network Security

摘　　要：低压电力线信道中普遍存在较大的脉冲噪声,这对OFDM电力线通信系统的自动增益控制(AGC)带来了极大的挑战。在分析电力线通信系统架构及脉冲噪声特点的基础上,提出了一种抗脉冲噪声能力强的自动增益控制新方法。该方法通过在自动增益控制中嵌入脉冲检测电路,在检测到脉冲噪声或系统帧同步时,停止增益调整,可有效防止脉冲噪声引起AGC误动作,降低接收过程中脉冲噪声对AGC的干扰。仿真结果表明,所提出的自动增益控制方法能有效提高电力线通信接收机的性能。Large impulsive noise is common in low-voltage power line channels,which poses a great challenge to the automatic gain control(AGC)of OFDM power line communication(PLC)systems.Based on the analysis of the structure of PLC system and the characteristics of impulse noise,this paper proposes a new method of AGC with strong anti-impulsive noise capability.By embedding the impulsive detection circuit in the AGC,the method stops the gain adjustment when the impulsive noise or the system frame synchronization is detected,which can effectively prevents the AGC from malfunction caused by the impulsive noise,and reduces the interference of the impulse noise on the AGC during the receiving process.The simulation results show that the proposed AGC method can effectively improve the performance of PLC receivers.

关 键 词：电力线通信 自动增益控制 脉冲噪声 正交频分复用 

分 类 号：TN911.23[电子电信—通信与信息系统]