Throughout preparation of this book, I have received invaluable assistance, support, and suggestions from many people for which I'm sincerely grateful. I would like to thank the staff of Prentice Hall, especially Bernard Goodwin for his support of this project. I'm also very much indebted to the following people for their contributions to different chapters of this book: Dr. Hans Schantz from Next RF, Inc.; Dr. Christian Fischer from Swisscom Innovations; Julia Fraser from OFCOM; and Mareca Hatler from ON World Inc.
I would especially like to thank Joe O'Neil, Ron Sailors, and Roger Tilley for their detailed review of the manuscript, constructive criticism, and suggestions of information to be added. Their generosity with their time and skills has made this book easy to understand for a wide range of readers.
Further, my special thanks goes to the following individuals for their assistance in using the copyrighted materials in this book: Mark Bowles from Staccato Communications; Dr. Mike Sablatash from Communications Research Center, Canada; and Dr. Salim Hanna from Industry Canada.