Date Added: Jan 2012
Over the past twenty years, a number of wireless technologies were developed. The first generation systems are based on analog radio transmission. The Second Generation systems 2G brought a number of significant advancements over 1G wireless networks. The second generation systems like TDMA or CDMA systems are completely digital in nature. The Third generation systems like Universal Mobile Telecommunication System (UMTS), CDMA 2000 based on Wireless CDMA technologies is to provide high speed wireless communication to support multimedia, video, data and voice.