电力无线区域网符号定时算法研究  

Research on Symbol Timing Algorithm in WRAN for Power Grid

作　　者：杨家全 李维 

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《云南电力技术》2016年第1期75-78,共4页Yunnan Electric Power

摘　　要：无线区域网(WRAN)可以为电力通信系统提供宽带无线接入解决方案,其物理层采用正交频分复用(OFDM)调制方式,而符号定时同步是OFDM接收机设计的关键技术。基于W RAN系统的帧前导序列结构特点,提出了时域与频域相结合的两步符号定时算法,该算法与传统算法相比,解决了由峰值平台带来的定时不确定以及次峰带来的定时不准确等问题。理论分析和仿真结果表明,该算法符号定时准确率高,是一种适合于WRAN系统的符号定时算法。Wireless Regional Area Network（WRAN） provides an solution of broadband wireless access to wireless communications for power system, where Orthogonal Frequency Division Multiplexing （OFDM） technology is adopted in the physical layer and symbol timing synchronization plays an important role in the OFDM receiver design. A symbol timing based on the frame preamble structure was proposed for WRAN system in this paper, which consists of two steps： coarse symbol timing estimation in time domain and fine symbol timing estimation in frequency domain. Compared with conventional method, the proposed algorithm solves the problems of plateau＇s uncertainty and sub-peak＇s inaccuracy. Theoretical analysis and simulation results demonstrate that the proposed algorithm provides high accurate synchronization suitable for WRAN system.

关 键 词：电力无线通信 无线区域网 正交频分复用 符号定时同步 帧前导序列 

分 类 号：TM73[电气工程—电力系统及自动化]