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一种多径电力线信道下的主路径定时同步算法
申敏,李俊强
0
(重庆邮电大学 通信与信息工程学院,重庆 400065;新一代宽带移动通信重点实验室,重庆400065)
摘要:
分析了多径电力线信道特性,针对电力线通信信道中第一主路径非能量最强路径的定时同步问题,通过仿真分析信噪比与门限选择的关系,拟合了最优的第一主路径门限曲线,并提出了一种在多径电力线信道下寻找第一主路径的自适应定时同步门限选择方法,利用接发端前导信号互相关判决函数的峰均比关系自适应选择门限,用于解决电力线恶劣的信道环境下第一主路径非能量最强路径的情况下寻找第一主路径的问题。仿真表明,该方法同步性能明显优于固定阈值且接近于最优阈值的判决方法,相比固定门限有1 dB的提升。
关键词:  电力线通信  正交频分复用  定时同步  第一主路径
DOI:
基金项目:国家科技重大专项(2016ZX03002010-003)
A main path timing synchronization method in multipath power line channel
SHEN Min,LI Junqiang
(College of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of New Generation Broadband Mobile Communication Technology,Chongqing 400065,China)
Abstract:
The characteristics of power line channel multipath environment are analyzed.For the problem that timing synchronization for the first main path of power line communication(PLC) is not the energy strongest path,through analysis of the relationship between the signal-to-noise ratio(SNR) and the selection of the threshold,the first main path curve of the optimal threshold is fitted,and adaptive timing synchronization threshold selection method for finding the first main path in multipath power line channels is proposed.According to the peak-to-average ratio of the correlation function of the local preamble signal,the adaptive threshold is selected to solve the problem of finding the first main path,although the first main path is not the strongest energy path in power line channel environment.The simulation shows that the synchronization performance of the proposed method is obviously superior to the fixed threshold and is close to that of the optimal threshold method.It has 1 dB improvement compared with the fixed threshold.
Key words:  power line communication(PLC)  OFDM  timing synchronization  first main path
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