电力线正交频分复用通信专用耦合电路的设计与实现

A COUPLING UNIT SPECIALLY DESIGNED FOR POWER LINE ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) COMMUNICATION AND ITS IMPLEMENTATION

正交频分复用 (OFDM)用于低压电力线载波通信能够有效解决噪声、多径和频率选择性衰落等问题。然而 ,OFDM发送器要求信号在很宽的频带上线性地传输 ,普通的耦合电路无法满足要求。文中设计了一个能有效减小低压电力线的低阻抗影响的功率匹配和增益平衡电路 ,用来将信号耦合到电力线上 ,其传输频带为 0 .1MHz～ 30 .0MHz。该设计的首要目的是实现网络信号的最大功率传输。在居民区和工业区进行了试验测量 。

Orthogonal frequency division multiplexing (OFDM) is proposed as a new and efficient method for resolving such problems as noise, multi-path propagation and frequency selective fading in power line communication (PLC). However, OFDM transmitter requires a highly linear operating environment. Besides, the low signaling impedance of power line is another challenge. This paper examines the design of a power line matching and gain equalization unit capable of providing wide-band mitigation of the effects of low impedance loads on PLC at frequencies ranging from 0.1 MHz to 30 MHz. Maximization of the power transmitted from an upstream to downstream communication equipment is the main objective of the present work. Some experimental measurements have been performed in residential and industrial quarters. Motivations to conduct this experiment are given, some compromise is obtained and results are presented. This project is supported by XUJI Bounty of China Electricity Fund.