目的：介绍一种基于低压电力线通信的病房呼叫系统。

Objective To introduce ward calling system based on power line communication.

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本文主要研究基于OFDM的低压电力线通信信道估计算法。

Channel estimation is researched for OFDM system in low-voltage power line communication in this paper.

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文中分析了电力线信道的阻抗、噪声、衰减特性，据此给出了电力线信道模型，有助于深入理解低压电力线通信的特点。

This paper analyzes the impedance, noise and attenuation characteristics of PLC channel and introduces the PLC channel model which will help us understand PLC further.

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