Wireless Communication: Past, Present, and Future Ericko Yulianto Engineering 302 May 7, 2002

Before the Birth of Radio James Clerk Maxwell –A brilliant mathematician –Maxwells Differential Equation –Theories of relativity Heinrich Rudolf Hertz –A professor of physics –Experiments dealing with electric waves –First to broadcast and receive radio waves

Continued Edouard Branly –Coherer wireless detector Oliver Joseph Lodge –Designed a standard detector in early wireless telegraph receivers Alexander Popov –Radio inventor (?)

The Birth of Radio Guglielmo Marconi –Educated in England and Italy –Hertzs death fired Marconi with idea –Experimented in transmitting detectable Morse signal over a certain range. –Granted a British patent in March 1897 –The Wireless Telegraph and Signal Company

Transoceanic Communication To break the isolation of the sea First person to bridge the Atlantic by wireless Used in commercial and defense ships Titanic incident – saved some 1,500 people Involved heavily in World War I

The Growth of Radio Station First broadcaster: KDKA in Pittsburgh (November 2, 1920) In less than 6 months, over 250 new station licenses are granted. The U.S government restricts broadcasting to specific wavelength. Advertising on radio: American Telephone and Telegraph Company

Continued Edward Howard Armstrong: Frequency Modulation (FM) in 1935 First used for public safety used. Involved in World War II –Motorolas Handie-Talkie and Walkie- Talkie Post-war rival: television

Telephone-Radio Era Lars Magnus Ericsson –Partnered with Carl Andersson L.M Ericsson and Co. 1881: First Ericsson telephones were used 1910: Car-telephone Early 1920s: Mobile radio telephone systems for police car dispatch.

Continued 1928: Galvin Manufacturing Co. Motorola 1934: Federal Communications Commission 1946: AT&T and Southwestern Bell introduced the first American commercial mobile radio-telephone –Six channels in 150 Mhz

Continued Cellular phone –D.H Ring and W.R. Young from Bell Laboratories (1947) –A network of small geographical areas (called cells) –Japanese rival: Motorola –1971 Intel introduced the first microprocessor

Continued Europe: Groupe Speciale Mobile (GSM) –Began in 1982 by a group of 26 European national phone companies –In many respects was better designed –North American counterpart: PCS 1900

Future Digital technology –IF Processing –High Speed DSP Processors –Reconfigurable Architecture Microcell –One to two orders of magnitude smaller than the current cellular system Cost will significantly decrease Easy and flexible implementation