基于OFDM电力线载波通信系统同步新方法  

A new timing synchronization method for low-voltage OFDM power-line communication system

作　　者：罗春风[1] 文劲宇[2] 杨慧敏[2] 熊兰[2] 

机构地区：[1]广东电网公司佛山供电局,广东佛山528000 [2]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电力系统保护与控制》2010年第17期28-32,共5页Power System Protection and Control

基　　金：教育部新世纪优秀人才支持计划项目(NCET-06-0643)

摘　　要：提出一种新的符号定时同步判决准则,并将其应用于低压电力线OFDM载波通信系统,实现了准确的符号同步。将所提出的方法及延迟相关法、改进延迟相关定时同步算法分别应用于实际低压电力线弥散通信网络中,对比分析结果表明采用提出的新定时同步准则算法克服了改进延迟相关法可能引起误判,判决阈值选择裕度小这一缺点,算法更稳定可靠。实际低压电力线信道实验网络测试表明,新判决准则不仅可以有效地进行OFDM系统准确的符号定时同步,且判决阈值选择裕度大,计算量较小。A new decision criterion is proposed for timing synchronization and applied in LV OFDM power line which has realized accurate symbol synchronization. The delay and correlation algorithms as well as the new synchronization algorithm proposed are used in a realistic low voltage power line.The performances of three timing synchronization algorithms are compared.It is concluded that the proposed synchronization scheme can settle the possible misjudgment problem of modified delay and correlation algorithm and the condition that the selection margin of decision margin is small,so the algorithm is more steady and reliable.In addition,the proposed approach is advantageous to improve the selection margin of decision threshold and reduce the computation.

关 键 词：低压电力线载波通信 正交频分复用 符号定时同步 延迟相关法 同步判决准则 

分 类 号：TM73[电气工程—电力系统及自动化]