Wireless communication refers to the replacement of data without the use of wires over a distance. The length can be as short as a few meters or as long as hundreds of kilometers. Mobile phones, Pdas, wireless networks and satellite Tv are only few of the wide collection of fixed, Mobile or transported devices and systems that hire wireless communication technology.
The cellular idea was introduced in the 1960s and 1970s, since then the communication business has witnessed gigantic growth. Wireless communication networks have come to be omnipresent and the worldwide cellular subscriber base is staggering to cross 5.5 billion users in 2013, with a increase rate of 40% or more a year!
The sharp increase in cellular subscribers over recent years shows that wireless communications are a robust and sustainable voice and data converyance system. Newer wireless systems and technology contain voice and data in addition to voice phone calls.
The first generation wireless communication systems were launched in 1980s (1G) which used analog signals for communication and relied on Tdma technology alone. These were replaced by the second generation (2G) systems in 1990s which used digital signals and could transmit data in addition to voice. Gsm is an prominent 2G standard. 2G was upgraded to 2.5G to give best data speeds. Services like Gprs, Edge and Wap were introduced with it for Mobile browsing. Introduced in 2001, the 3G systems made simultaneous transmission of voice and data possible. In addition to high speed internet access, facilities such as video calling and Mobile Tv are now possible. Meanwhile, 3G is evolving into 3.5G with features like WiMax, 4G is staggering to provide Ip based services. That means in the hereafter every expedient will have a unique Ip Address.
At the same time as cellular networks organize new standards to facilitate high speed data communication, new technologies are being implemented to allow wireless networks to replace traditional copper wires and fiber optic links between fixed points, several kilometers apart (fixed wireless access). Similarly wireless networks have been increasingly used as substitute to wired ones within offices, homes and buildings by creating wireless local area networks (Wlans). WiFi is the most widely used Wlan technology. The evolution of Bluetooth technology has helped to generate personal area networks (Pans), replacing the troublesome appliance communication cords with invisible wireless connections within a personal workspace. Infrared is also other short range, point to point wireless data transmission system.
movable and Wireless communication Systems - Past, present and future