窄带OFDM低压电力线载波技术及标准化发展趋势分析

Narrowband OFDM low-voltage power line communications techniques and analysis of their standardization development trend

针对低压电力线载波通信及电力用户用电信息采集应用,分析了窄带OFDM低压电力线载波技术的发展现状以及国际标准化情况。首先分析了低压配电网电力线信道的特点,揭示了新一代低压电力线载波通信均采用窄带OFDM调制技术的原因;然后针对我国电力用户用电信息采集电力线载波本地网络,提出了一种协议栈模型,目的是为标准化建立一个分层协议框架,实现不同厂家载波终端的互联互通和互操作。最后分析了物理层工频过零点传输的必要性,并对几个主要的窄带OFDM物理层标准进行了比较。

This paper analyzed the recent development and international standardization of the narrow-band OFDM technology for low-voltage power line communications（ PLC） targeting low-voltage PLC and automatic meter reading（ AMR） applications. The pager first analyzed the characteristics of the low-voltage power distribution lines when used as communication channels,and revealed the reasons why the narrow-band OFDM modulation techniques had been widely adopted for the new generation of PLC. The paper then proposed a protocol stack model for the local PLC in the AMR system in order to establish a layered protocol framework for standardization to realize interconnection and interoperability among different manufacturer carrier terminals. The paper finally analyzed the necessity of zero-crossing transmission on the physical layer,and compared several main narrow-band OFDM standards on the physical layer.