This text focuses on wireless data communications and how the third-generation (3G) systems will enhance wireless communications. It is a study into the evolution of CDMA from 2G to 3G. It seeks to help those implementing 2G to migrate to 3G.About the Author: VIJAY K. GARG had been with Lucent Technologies Bell Laboratories since 1985, where he was a Distinguished Member of Technical Staff. He is a professor in the Department of Electrical Engineering and Computer Engineering, University of Illinois at Chicago. His books include IS-95 CDMA and cdma2000, Principles and Applications of GSM, Applications of Code Division Multiple Access in Wireless Personal Communications, and Wireless and Personal Communications Systems.