Lect-41_07 - Lecture 41 Mobile Communication 24-04-2007 1...

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1 Lecture –41 Mobile Communication 24-04-2007
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2 Cellular Telephone Systems
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3 History & Evolution 1921 – Radio Dispatch Service was introduced for Police cars in Detroit. 1934 – AM mobile communication system used by hundreds of state & municipal forces. The major problem was with ignition noise for early mobile users. 1935 – Edwin Armstrong demonstrated FM and in the late 1930s FM became the primary modulation technique for mobile communication systems. 1946 – Radio-telephone connections made to the PSTN. 1968 – Development of Cellular telephony concept at Bell Telephone Laboratories. The development of highly reliable solid-state RF hardware in 1970s marked the beginning of wireless communication era.
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4 First Mobile Radio Telephone 1924 Courtesy of Rich Howard
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5 World Telecom Statistics 0 200 400 600 800 1000 1200 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Landline Subs Mobile Subs (millions) Crossover has happened May 2002 !
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6 1 2 3 4 5 6 7 1 2 3 4 5 6 7 5 7 2 2 1 1 2 3 4 5 6 7 3 Cellular Mobile Telephony Frequency modulation Antenna diversity Cellular concept Bell Labs (1957 & 1960) Frequency reuse Typically every 7 cells Handoff as caller moves Modified CO switch HLR, paging, handoffs Sectors improve reuse Every 3 cells possible
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This note was uploaded on 09/24/2010 for the course MATHEMATIC AAOC C222 taught by Professor Prof.dilipkumarsatpathi during the Fall '07 term at Birla Institute of Technology & Science, Pilani - Hyderabad.

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Lect-41_07 - Lecture 41 Mobile Communication 24-04-2007 1...

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