Wireless Communications:

The cellular revolution is apparent in the growth of the mobile phone market. Mobile communication includes cellular personal communication systems, personal communication networks, land mobile and mobile satellite radio systems. In 1930s all mobile radio used were using amplitude modulation. In 1935, frequency modulation was used. The first generation of wireless communication is angular cellular system. The second generation of wireless communication is digital cellular system. The third generation of wireless communication is based on CDMA as the multiple access technology. Wireless network topology is the configuration in which mobile terminals communicate with another. Mobile radio transmission system may be classified as simplex, half duplex and full duplex. The important terms in wireless communication are base station, control channel, forward channel, half hand mobile station, mobile switching center, page, reverse channel, frequency division multiplexing and time division multiplexing. The examples of wireless communication are paging system, cordless telephone systems and cellular telephone systems. Some of the common wireless communication systems are TV remote control, garage door opener, paging system, cordless phone and cellular phone. A device which is capable of simultaneously transmitting and receiving operation is known as transceiver. Later on global system for mobile, digital European cordless telephone, CDMA digital cellular standard, advance mobile phone service, 3G wireless networks, Bluetooth, etc are introduced in wireless communication.