Wireless Digital Communications: Design and Theory Tom McDermott, N5EG
Published by: Tucson Amateur Packet RadioCorporation
Includes software disk
Wireless DigitalCommunications: Design and Theory By: Tom McDermott, NSEG
[email protected]
Published by: Tucson Amateur Packet Radio Corporation
Copyright © 1996, 1998 by Tucson Amateur Packet Radio Corporation This work ispublication No. 98-1 ofthe TAPR Library, published byTAPR. All rights reserved. Nopart ofthis work may be reproduced in any form except by written permission of the publisher. All rights oftmnslation arereserved. Printed in the USA Quedan reservados todos losderechos ISBN: 0-9644707-2-1 First Edition First Printing, 1996 Second Printing, 1998 TAPR Production Editor: Greg Jones, WD5IVD Proof Reader: Lauro Arnill
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Contents Foreword by Frank H. Perkins, Jr. WB5IPM
ix
Preface
xi 1
Chapter 1 - Introduction Definition of Information Source Entropy Fundamental Data Capacity Signal to Noise ratio - Eb/No Block Diagram of the Communication System Review / Definition of Some Key Concepts Eye Pattern Signal Constellation Diagram Chapter 1 - References
2 3 4 5 7 9 11
12 14
Chapter 2 -Additive White Gaussian Noise (AWGN) Definition of AWGN Noise Gaussian Distribution Calculating the BER given AWGN Generating a BER Curve Relation of Power Spectrum and AWGN Computing Noise and Signal Magnitudes Chapter 2 - References
15
15 17 19 22 23 25 26
Chapter 3 - Antipodal, Orthogonal, and Non-orthogonal Signaling Antipodal Signaling Orthogonal Signaling Non-orthogonal Signaling Analysis of FSK signaling Orthogonal Waveforms Orthogonal FSK Demodulators Chapter 3 - References
27
27 29 31 32 36 37 40 41
Chapter 4 - Carrier Transmission FSK - Frequency Shift Keying FFSK - Fast Frequency Shift Keying mFSK - m-ary FSK PSK - Phase Shift Keying mPSK - m-ary Phase Shift Keying OQPSK - Offset QPSK Received Phase Ambiguity Performance of PSK modulation in the presence of AWGN ASK - Amplitude Shift Keying MSK - Minimum Shift Keying OFDM - Orthogonal Frequency Division Multiplexing OFDM based on m-ary FSK
41 46 47 49 50 51 53 54 58 60 63 63
OFDM based on ASK AFSK - Audio Frequency Shift Keying Summary Chapter 4 - Reference
65 67 68 70
71
Chapter 5 - Frequency and Impulse Response of Optimum Modem Filters Optimum filter criteria Raised-Cosine Filter Responses Filter Response Partitioning Filter Impulse Response Filter Response to an Isolated Data Bit Eye Pattern Generation Equivalent Noise Bandwidth Some Frequency Response Defects Impulse-Response Length Truncation Detailed Step-by-Step Procedure Dolph-Chebychev Transmit Pulses Chapter 5 - Reference
73 74 77
83 86 92 96 97 99 106 109 112 113
Chapter 6 - Matched Filters Matched filter for Rectangular Pulses Matched filter for Square-Root Raised-Cosine Transmit Pulses Use of the Matched Filter Symmetry to Equalize a Channel Chapter 6 - Reference
115 117 118 120
121
Chapter 7 - Data Codes Baseband Data Codes DC-Balance (One's Density) of the Code Scrambling Forward Error Correcting (FEC) Codes Linear Block Codes AWGN Performance of Linear Blo