Wireless Communication: Past, Present, and Future Ericko Yulianto

Yüklə 487 b.
ölçüsü487 b.

Wireless Communication: Past, Present, and Future

  • Ericko Yulianto

  • Engineering 302

  • May 7, 2002

Before the “Birth of Radio”

  • James Clerk Maxwell

    • A brilliant mathematician
    • Maxwell’s Differential Equation
    • Theories of relativity
  • Heinrich Rudolf Hertz

    • A professor of physics
    • Experiments dealing with electric waves
    • First to broadcast and receive radio waves


  • Edouard Branly

  • 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
    • Hertz’s 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


  • Edward Howard Armstrong: Frequency Modulation (FM) in 1935

  • First used for public safety used.

  • Involved in World War II

    • Motorola’s 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.


  • 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


  • 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


  • Europe: Groupe Speciale Mobile (GSM)


  • Digital technology

    • IF Processing
    • High Speed DSP Processors
    • Reconfigurable Architecture
  • Microcell

  • Cost will significantly decrease

  • Easy and flexible implementation

Yüklə 487 b.

Dostları ilə paylaş:

Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©genderi.org 2024
rəhbərliyinə müraciət

    Ana səhifə