电力无线区域网符号定时算法研究

Research on Symbol Timing Algorithm for Power WRAN

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WRAN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 a solution of broadband wireless access for power system, and 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 algorithnl based on the frame preainble sequence structure is 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 can provide high accurate synchronization, which is suitable for WRAN system.