Digitální modulace v telekomunikacích

Abstract

The topic in this work is digital modulation in Telecommunications. We will talk about, what is modulation, division on analog and digital modulation, where we focus on digital modulation. I will describe amplitude, frequency and phase shift keying. In second part you will find the describtion of DSL technology, historical evolution from symmetric DSL to asymmetric. I will look in detail on ADSL. Afterwards I will explain digital modulation in ADSL. These are CAP modulation, used till year 1996 and DMT modulation, which takes place instead of CAP, until today. Practical part is guideline on how to create choosen digital modulation on the learning system TIMS in form of laboratory measurement for students, including exemplary protocol.