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History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
History of wireless communication
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History of wireless communication

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HISTORY OF WIRELESS COMMUNICATION

HISTORY OF WIRELESS COMMUNICATION

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  • 1. HISTORY OF WIRELESS COMMUNICATION AJAL.A.J Assistant Professor –Dept of ECE, Federal Institute of Science And Technology (FISAT) TM   MAIL: ec2reach@gmail.com
  • 2. @ 150 BC• The use of smoke signals for communication ( mentionedd by polybius – Greece)
  • 3. @ 206 BC – 24 AD• Han Dynasty in Ancient China . ( light was used for signalling messages along a  line of signal towers towards the capitol  Chang’an –  { Xi’an}   )
  • 4. Note • Using light and flags for wireless communication remained important for the navy until radio transmission was introduced.ImportanceEven today a sailor has to know some codes represented by flags if all other means of wireless communication fail
  • 5. @ 1974Claude chappe• It was not until the end of the 18 th centuary, when Claude chappe invented – Optical Telegraph• that long- distance wireless communication was possible with technical means.• Optical Telegraph lines were built almost until the end of the following centuary.
  • 6. @1843 • Wired communication started with the first commercial telegraph line between Washington Baltimore•Alexander Graham Bells invention & marketing of telephone in  1876 •Others tried before but didn’t succeed Example – Philips Reis ,  (1834- 1874) – who discovered the telephone principle
  • 7. @1881• In Berlin, a public telephone service was available in 1881
  • 8. @ 1936• The first regular public voice & multimedia video service Was available in 1936  between Leipzig Berlin
  • 9. Note• At that time , it was not possible to focus light as efficiently as can be done today by means of a laser, wireless communication did not really take off until the discovery of EM waves &The development of the equipment to modulate them
  • 10. @ 1831• It all started with michael Faraday ( and about the same time Joseph Henry )• Demonstrating EM induction in 1831 &• James C Maxwell ( 1831- 1879) laying the theoretical foundation for EM fields with his famous equations @ 1864
  • 11. @ 1857- 1894• Heinrich Hertz was the first to demonstrate the wave character of electrical transmission through space (1886) thus providing Maxwells equations.NoteToday the unit Hz reminds us of this discovery.
  • 12. @ 1856 - 1943• Nikola Tesla (1856 - 1943 ) soon increased the distance of EM transmission
  • 13. @ 1874 - 1937• The name , which is most closely connected with the success of wireless communication , is certainly that of Guglielmo Marconi (1874 – 1937)• He gave the 1 st demonstration of wireless telegraphy in 1895 using long wave transmission with , very high transmission power ( > 200 K w )
  • 14. @ 1901• The first transatlantic transmission followed in 1901
  • 15. @ 1906• WARC – World Administration Radio Conference took place , cordinating world wide use of radio frequencies• The 1 st radio broadcast tookplace in 1906 when Reginald A Fessenden  transmitted voice and music for christmas
  • 16. @ 1906   contd …..• The invention of electronic vaccum tube in 1906 byLee De Forest ( 1873- 1961) &Robert Von Lieben ( 1878 – 1913 )Helped to reduce the size of sender and receiver
  • 17. @1907• Only 6 years later in 1907 , 1 st commercial transatlantic connections were setup .• Huge Base Stations using upto thirty 100 m high antennas where needed on both sides of the atlantic ocean
  • 18. @ 1911• One of the 1 st mobile transmitter was on board at Zeppelin in 1911
  • 19. @ 1915• In 1915 , the first wireless voice transmission was set up between New York San Francisco
  • 20. @ 1920• The 1 st commercial radio station started in 1920 [ KDKA – from pittsburgh ]NoteSender & Receiver still needed huge antennas&High transmission power.
  • 21.  @ 1920      contd…• This changed fundamentally with the discovery of – short waves again by Marconi in 1920( in connection with wireless communication , short waves have the advantage of being reflected at the ionosphere)
  • 22. @ 1926• As early as 1926, the first telephone in a train was available on the Berlin – Hamburg line Note Wireless parallel to the railroad track worked as antenna
  • 23. @ 1927• The first car radio was commercially available in 1927 ( philco Transitone )• NOTE George Frost an 18 year old from Chicago had integrated a radio into a Ford Mode T as early as 1922
  • 24. @ 1928• 1928 was the year of many field trials for TV broadcasting.• John L Baird ( 1888 – 1946 ) transmitted TV across Atlantic and demonstrated colour TV
  • 25. @ 1932• The first tele teaching started in 1932 from the CBS station .• Uptil then , all wireless communication used AM which offered relatively poor quality due to interference
  • 26. @ 1933• One big step forward in this respect was the invention of FM in 1933 by• Edwin H Armstrong [ 1890 - 1954 ] both the fundamental modulation schemes are still used for todays radio broadcasting with FM having much better quality
  • 27. @ 1958• After II nd world war , the first network in Germany was the analog A- Netz from 1958, using a carrier frequency of 160 Mhz.• Connection setup was only possible from the mobile station and no handover ie: changing the base station was possible
  • 28. @ 1982• In acordance with the general idea of European Union , European countries decided to develop a pan – European mobile phone standard in 1982 ant their aim was :-1. Use a new spectrum at 900 MHz2. Allow roaming throughout Europe3. Be fully digital4. Offer voice & data service It was GSM
  • 29. @ 1986• The northern European countries of Denmark Finland Cradle of modern mobile communication Norway SwedenAgreed upon the NMT { Nordic Mobile Telephone } system .•The analog NMT uses 450 Mhz carrier
  • 30. GSMGroupe Speciale Mobile
  • 31. @  1983• In 1983 the US system AMPS [ Advanced Mobile Phone System ] Started .• AMPS is analog & working at 850Mhz
  • 32. @1990• The early 1990s marked the beginning of fully digital systems.• In 1991, ETSI adopted the standard –DECT [ Digital European Cordless Telephone ]• DECT works at a spectrum of (1880-1900) Mhz.
  • 33. Roaming• Roaming means a seamless handover oa a telephone call From  one N/W provider To  anotherWhile crossing national boundaries

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