Mobile Communications I - IHP Microelectronics

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Wireless networks in comparison to fixed networksHigher loss-rates due to interference emissions of, e.g., engines, lightningRestrictive regulations of frequencies frequencies have to be coordinated, useful frequencies are almost alloccupiedLow transmission rates local some Mbit/s, regional currently, e.g., 53kbit/s with GSM/GPRSHigher delays, higher jitter connection setup time with GSM in the second range, several hundredmilliseconds for other wireless systemsLower security, simpler active attacking radio interface accessible for everyone, base station can be simulated,thus attracting calls from mobile phonesAlways shared medium secure access mechanisms importantDr.-Ing. Jean-Pierre Ebert MC-I SS07 1.14
Early history of wireless communicationMany people in history used light for communication heliographs, flags („semaphore“), ...150 BC smoke signals for communication;(Polybius, Greece)1794, optical telegraph, Claude ChappeHere electromagnetic waves areof special importance: 1831 Faraday demonstrates electromagnetic induction J. Maxwell (1831-79): theory of electromagnetic Fields, wave equations(1864) H. Hertz (1857-94): demonstrateswith an experiment the wave characterof electrical transmission through space(1888, in Karlsruhe, Germany, at thelocation of today’s University of Karlsruhe)Dr.-Ing. Jean-Pierre Ebert MC-I SS07 1.15
Page 3 and 4: Administrative Issues Lecture dates
Page 5 and 6: Chapter 1:Introduction A case for m
Page 7 and 8: Mobile communicationTwo aspects of
Page 9 and 10: Mobile and wireless services - Alwa
Page 11 and 12: Location dependent servicesLocation
Page 13: Effects of device portabilityPower
Page 17 and 18: History of wireless communication I
Page 19 and 20: History of wireless communication I
Page 21 and 22: Wireless systems: Overview of the d
Page 23 and 24: Worldwide wireless subscribers (old
Page 25 and 26: Worldwide cellular subscriber growt
Page 27 and 28: Mobile statistics snapshot (09/2002
Page 29 and 30: Wireless Internet ChallengesAttribu
Page 31 and 32: Influence of mobile communication t

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