本文介紹了寄生傳輸線的信道特性和信道模型，寄生傳輸線具有衰減大、輸入阻抗
小、很強的時變性和干擾大的特點。信道模型為一線性時變系統。整個信息寄生傳輸系統由控制中心主機部分和監測點終端部分組成，最后說明了系統的軟件設計。本文介紹的信息寄生傳輸系統已成功應用到倉庫報警和溫濕度檢測中。
關鍵詞：溫濕度；時變系統； 信道模型；單片機；寄生傳輸
Abstract: This paper introduces the channel characteristics and the channel model for the
parasitical transmission line. The parasitical transmission line has characteristics of great
attenuation, small input resistance, time variant and big interference. The channel model is a
linear time variant system. The parasitical transmission system for information is composed of
the host computer in the control center and the terminal in the monitoring locale. Finally, the
paper describes the software design of system. The introduced system in this paper has
successfully been used in the alarm and the temperature and humidity detecting for the storage.
Keyword: temperature and humidity detecting; time variant system; channel model;
microcontroller; parasitical transmission