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Lecture 2_AMPLITUDE MODULATIONS AND DEMODULATIONS-Part1, Summaries of Telecommunications Engineering

COMSATS Institute of Information Technology, Attock (CIITA)Telecommunications Engineering

Prof. Ithesham Jadoon

Modulation is a fundamental concept in various fields, including mathematics, physics, engineering, and communication. In this response, I'll provide a detailed explanation of modulation, its types, and some of its applications. 1. Modulation Overview: Modulation is a process of varying one or more properties of a high-frequency carrier signal with a lower-frequency input signal. The high-frequency carrier wave is usually a sinusoidal wave, and the modulation process alters one or more of its characteristics, such as amplitude, frequency, or phase. Modulation is employed for various purposes, including transmitting information over long distances and multiplexing multiple signals

Typology: Summaries

2022/2023

Uploaded on 10/29/2023

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Download Lecture 2_AMPLITUDE MODULATIONS AND DEMODULATIONS-Part1 and more Summaries Telecommunications Engineering in PDF only on Docsity! 11/10/2023 1 AMPLITUDE MODULATIONS AND DEMODULATIONS Chapter 4 Contents 1 2 11/10/2023 Modulation * Modulation is a process that causes a shift in the range of frequencies in a signal. * Two types of communication systems — Baseband Communication — Carrier Modulation * The baseband is used to designate the band of frequencies of the source signal i.e., audio signal 4KHz, video 4.3MHz * In analog modulation the basic parameter such as amplitude, frequency or phase of a sinusoidal carrier is varied in proportion to the baseband signal m(t). * This result in amplitude modulation (AM) or frequency modulation (FM) or phase modulation (PM). Modulation * m(t)= Modulating Message Signal * c(t)=Carrier Signal * (t)=Modulated Signal m(t) ———®| Modulator vit) Modulating message signal Modulated signal baseband bandpass e(t) Carrier signal narrowband 11/10/2023 5 Double Sideband Suppressed-Carrier (DSB-SC) Modulation Frequency Domain Description Double Sideband Suppressed-Carrier (DSB-SC) Modulation 9 10 11/10/2023 6 Double Sideband Suppressed-Carrier (DSB-SC) Modulation Double Sideband Suppressed-Carrier (DSB-SC) Modulation 11 12 11/10/2023 7 Example Double Sideband Suppressed-Carrier (DSB-SC) Modulation 13 14

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