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1 @ McGraw-Hill Education Principles of Communication Systems, Third Edition Herbert Taub, Donald L Schilling, Goutam Saha Chapter 6 : Part A Digital Modulation and Transmission PROPRIETARY MATERIAL. © 2008 The McGraw-Hill Companies, Inc. All rights reserved. No part of this PowerPoint slide may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation. If you are a student using this PowerPoint slide, you are using it without permission. Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 2 @ McGraw-Hill Education Binary Phase Shift Keying (BPSK) Sinusoidal carrier changes phase depending on binary signal level of digital data. If message signal b(t) is either +1 V or -1 V Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 3 @ McGraw-Hill Education BPSK reception Received signal has the form Squaring, BP Filtering above after frequency divider generates carrier. Multiplying carrier with received signal The integrator and dump (bit-synchronized) of above gives Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 4 @ McGraw-Hill Education BPSK Block Diagram Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 5 @ McGraw-Hill Education BPSK Spectrum Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 6 @ McGraw-Hill Education BPSK : Geometric Representation BPSK signal can be represented in terms of one orthonormal signal Distance between the signal, d is inversely proportional to the probability of error in presence of noise. Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 7 @ McGraw-Hill Education Quadrature Phase Shift Keying (QPSK)-1 Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 8 @ McGraw-Hill Education QPSK-2 Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 9 @ McGraw-Hill Education QPSK-3 The QPSK system discussed is called offset or staggered QPSK abbreviated OQPSK. Phase change only by 900. In non-offset QPSK there is an additional D-FF in one line of Fig. 6.10, thus even-odd could be same time, phase change could be 1800. Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 10 @ McGraw-Hill Education Symbol vs. Bit Transmision In BPSK, each bit of duration Tb is individually treated. In QPSK, two bits are lumped together to form what is termed a symbol. The symbol can have any of the four possible values corresponding to the two-bit sequences 00, 01, 10 and 11. At the receiver, each signal represents one symbol and correspondingly, two bits. When bits are transmitted, as in BPSK, the signal changes occur at the bit rate. When symbols are transmitted, the changes occur at the symbol rate which is one-half the bit rate. Thus, symbol time is Ts =2Tb Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 11 @ McGraw-Hill Education QPSK Receiver Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 12 @ McGraw-Hill Education QPSK : Geometric Representation Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 13 @ McGraw-Hill Education M-ary Phase Shift Keying-1 Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 14 @ McGraw-Hill Education M-ary Phase Shift Keying-2 Bandwidth, Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 15 @ McGraw-Hill Education M-ary PSK Transmitter Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 16 @ McGraw-Hill Education M-ary PSK Receiver Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 17 @ McGraw-Hill Education Binary Frequency Shift Keying (BFSK) Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 18 BFSK Spectrum @ McGraw-Hill Education Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 19 @ McGraw-Hill Education BFSK Receiver Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 20 @ McGraw-Hill Education BFSK : Geometric Representation Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 21 @ McGraw-Hill Education Non-Orthogonal BFSK When two FSK signals are not orthogonal Gram-Schmidt procedure can be used for geometric representation Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 22 @ McGraw-Hill Education M-ary FSK Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 23 @ McGraw-Hill Education M-ary Communication System Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only. 24 @ McGraw-Hill Education End of Part A Chapter 6 Copyrighted Material -Additional resource material supplied with the book Principles of Communication Systems,3E by Taub, Schilling, Goutam Saha published by Tata McGraw Hill. This resource material is for Instructor's use only.
