digital communication

Digital Communication Training Kit.1
Mohammad Sharawi and Husam Abu-Ajwah
Electronics Engineering
Princess Sumaya University
College for Technology
(Royal Scientific Society)
Amman–Jordan
August 1999

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c 2000 by Mohammad Sharawi and Husam Abu-Ajwah All rights Reserved.
No part of this report is to be copied, reproduced, or distributed in anyway, without written consent of the Author.
Contact: [e-mail] or [e-mail]

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To our Moms, and Dads.

Abstract
The aim of this project is to demonstrate three of the Digital

Modulation schemes used these days in Communications, which are the FSK(Frequency Shift Keying), the PSK(Phase Shift Keying), and the QPSK(Quadrature Phase Shift Keying), and to design the electronic circuits for these systems on a single PCB(Printed Circuit Board). This board is to be used for educational purposes in the Communications Lab at Princess Sumaya University College for
Technology.
This project includes:
1. Analysis and description for the main features of each of the modulation schemes.
2. Design and implementation of the electronic circuits for each of the three systems.
3. Design and implementation of a variable repetitive 8-bit word generator. 4. Design of the PCB Layout that would have the three systems mounted on.

Contents
1 Introduction

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2 Background
2.1 FSK Modulation . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 PSK Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 QPSK Modulation . . . . . . . . . . . . . . . . . . . . . . . . . .

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3 Circuit Design
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . .
3.2 Universal Clock and Word Generator . . . . . . . .
3.2.1 The Universal Clock . . . . . . . . . . . . .
3.2.2 The Word Generator . . . . . . . . . . . . .
3.3 FSK System . . . . . . . . . . . . . . . . . . . . .
3.3.1 FSK Transmitter . . . . . . . . . . . . . . .
3.3.2 FSK Receiver . . . . . . . .

Bibliography: [Bla93] R. Blake. Basic Electronic Communication. West Publishing, second edition, 1993. [Bla97] Richard Blahut. Introduction to Telecommunication Theory. University of Illinois at Urbana-Champaign, ECE 364 class notes, 1997. [Bog90] T. F. Bogart. Electronic Devices and Circuits. Merrill Publishing, second edition, 1990. [EM88] E. I. El-Masri. Analog Filter Design. Technical University of Nova Scotia, 1988. [Fra98] S. J. Franke. Radio Communication Circuits. University of Illinois at Urbana-Champaign, ECE 353 class notes, 1998. [Hay88] Simon Haykin. Digital Communications. John Wiley and Sons, second edition, 1988. [Hay94] Simon Haykin. Communication Systems. John Wiley and Sons, third edition, 1994. [Rap96] Theodore Rapparport. Wireless Communications, Principles and practice. Prentice–Hall Inc., third edition, 1996. [Raz98] Behzad Razavi. RF Microelectronics. Prentice–Hall Inc., first edition, 1998. [Skl88] Bernard Sklar. Digital Communications, Fundamentals and applications. Prentice–Hall Inc., third edition, 1988. Press, third edition, 1998.