A message signal m(t) = cos 2000rt+2 cos 4000rt modulates the carrier c(t) = 100 cos 27 fet where fe = 1 MHz to produce the DSB signal m(t)c(t). 1. Determine the expression for the upper sideband (USB) signal. 2. Determine and sketch the spectrum of the USB signal.

A message signal m(t) = cos 2000rt+2 cos 4000rt modulates the carrier c(t) = 100 cos 27 fet where fe = 1 MHz to produce the DSB signal m(t)c(t). 1. Determine the expression for the upper sideband (USB) signal. 2. Determine and sketch the spectrum of the USB signal.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

Problem:
A message signal m(t) = cos 2000rt+2 cos 4000rt modulates the carrier c(t) =
100 cos 27 fet where fe = 1 MHz to produce the DSB signal m(t)c(t).
1. Determine the expression for the upper sideband (USB) signal.
2. Determine and sketch the spectrum of the USB signal.

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Step 1: Given data

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Step 2: DSB signal derivation

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Step 3: Final DSB expression in time domain

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Step 4: DSB upper side band expression

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Step 5: Fourier transform concept

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Step 6: Final spectrum upper side band (partB)

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Digital Modulation Scheme (Amplitude-Shift Keying [ASK], Phase-Shift Keying [PSK], Frequency-Shift Keying [FSK])

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