摘要
G3-PLC是专为智能电网通信设计的电力载波通信标准。由于电力线信道环境恶劣,低信噪比时,G3-PLC通信可靠性难以保证。同时,因前向纠错结构复杂,核心技术正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)运算量大,实现效率较低。针对上述问题,基于嵌入式平台对G3-PLC进行优化,提出RS编码、卷积码、时频联合分段重构编码及循环维纳滤波联合应用的方法来优化系统可靠性,基于状态转移的方法实现OFDM符号准确同步,通过定点化FFT及合理的帧结构设计优化效率。设计的优化方法基于嵌入式平台进行实现及测试,结果表明,在信噪比为-11 dB时,可达10^-4以下的误码率,系统工作稳定,实现效率得到大幅提升。
G3-PLC is a power carrier communication standard specially designed for smart grid communication.Due to the poor channel environment of power line,it is difficult to guarantee the reliability of G3-PLC communication in the case of low SNR.At the same time,due to the complex structure of forward error correction,the core technology of OFDM(orthogonal frequency division multiplexing)has a large amount of computation,and the implementation efficiency is fairly low.Aiming at the above problems,G3-PLC based on embedded platform is optimized,and the method for RS coding,convolutional code,timefrequency joint segmented reconstruction coding and cyclic Wiener filter combined application proposed to optimize system reliability.The method based on state transition realizes the accurate synchronization of OFDM symbols.The efficiency is optimized by fixed-point FFT and reasonable frame structure design.The designed optimization method is implemented and tested based on the embedded platform.The experiment results indicate that when SNR is-11db,the bit error rate can be less than 10^-4,the system works stably,and the implementation efficiency is greatly improved.
作者
周宇
张峰
刘艳
ZHOU Yu;ZHANG Feng;LIU Yan(School of Electronic Information Engineering,Xi’an Technological University,Xi’an Shaanxi 710021,China)
出处
《通信技术》
2020年第5期1163-1168,共6页
Communications Technology
基金
国家自然科学基金项目(No.61271362)
陕西省科技厅一般项目-工业领域(No.2018GY-188)。
