Wireless Communication:Past, Present, and FutureEricko YuliantoEngineering 302May 7, 2002

Before the Birth of RadioJames Clerk MaxwellA brilliant mathematicianMaxwells Differential EquationTheories of relativityHeinrich Rudolf HertzA professor of physicsExperiments dealing with electric wavesFirst to broadcast and receive radio waves

ContinuedEdouard BranlyCoherer wireless detector

Oliver Joseph LodgeDesigned a standard detector in early wireless telegraph receiversAlexander PopovRadio inventor (?)

The Birth of RadioGuglielmo MarconiEducated in England and ItalyHertzs death fired Marconi with ideaExperimented in transmitting detectable Morse signal over a certain range.Granted a British patent in March 1897The Wireless Telegraph and Signal Company

Transoceanic CommunicationTo break the isolation of the seaFirst person to bridge the Atlantic by wirelessUsed in commercial and defense shipsTitanic incident saved some 1,500 peopleInvolved heavily in World War I

The Growth of Radio StationFirst 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

ContinuedEdward Howard Armstrong: Frequency Modulation (FM) in 1935First used for public safety used.Involved in World War IIMotorolas Handie-Talkie and Walkie-TalkiePost-war rival: television

Telephone-Radio EraLars Magnus EricssonPartnered with Carl Andersson L.M Ericsson and Co.1881: First Ericsson telephones were used1910: Car-telephoneEarly 1920s: Mobile radio telephone systems for police car dispatch.

Continued1928: Galvin Manufacturing Co. Motorola1934: Federal Communications Commission1946: AT&T and Southwestern Bell introduced the first American commercial mobile radio-telephoneSix channels in 150 Mhz

ContinuedCellular phoneD.H Ring and W.R. Young from Bell Laboratories (1947)A network of small geographical areas (called cells)Japanese rival: Motorola1971 Intel introduced the first microprocessor

ContinuedEurope: Groupe Speciale Mobile (GSM)Began in 1982 by a group of 26 European national phone companiesIn many respects was better designedNorth American counterpart: PCS 1900

FutureDigital technologyIF ProcessingHigh Speed DSP ProcessorsReconfigurable ArchitectureMicrocellOne to two orders of magnitude smaller than the current cellular systemCost will significantly decreaseEasy and flexible implementation