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• Wireless Communications: Principles & Practice. Rappaport, Prentice Hall, 1996.
• Wireless and Personal Communications Systems. Garg and Wilkes, Prentice Hall, 1996.
• Wireless Personal Communications Systems. Goodman, Addison-Wesley, 1997.
• Bluetooth Revealed. Miller and Bisidikian, Prentice Hall, 2001.
• Use of light as communication– heliographs, flags (semaphore), ...– 150 BC smoke signals for communication;
(Greece)– 1794, optical telegraph, Claude Chappe
• Electromagnetic Wave:– 1831-79 Faraday and Maxwell demonstrates
electromagnetic induction and theory of electromagnetic fields
– H. Hertz (1857-94): demonstrates the wave character of electrical transmission through space
Attributes of Telecommunication
• Speed
- Ability to transmit in real-time• Coverage
- Regional, National and International• Reliability• Cost
- 1860’s: 20 word telegram $5-$100• Security
High Tech of 19th Century
• 1850 – First submarine line
• 1858 – First transatlantic cable
- breaks after 3 month
• 1866 – Higher quality cable
- London to Bombay in 4 ½ mins.
1924 – Telegram around the world in 80 secs.
• 1896 Guglielmo Marconi– first demonstration of wireless
telegraphy – long wave transmission, high
transmission power necessary ( +200kw)
• 1907 Commercial transatlantic connections– huge ground stations (30 by100m antennas)
• 1915 Wireless voice transmission NY - SF• 1920 Discovery of short waves (< 100m) by Marconi
– reflection at the ionosphere– (cheaper) smaller sender and receiver, possible due to the invention
of the vacuum tube (1906, Lee DeForest and Robert von Lieben)
• 1920 First commercial radio broadcast in Pgh.• 1928 many TV broadcast trials• 1933 Frequency modulation (E. H. Armstrong)• 1935 First telephone call around the world• 1958, then 1972 A-Netz and B-Netz in Germany
– analog, 160MHz, connection setup from the fixed network too (but location of the mobile station has to be known)
• 1974 FCC allocates 40Mhz for Cellular telephony• 1982 Start of GSM-specification in Europe (Global
System for Mobile communication)• 1983 Start of the American AMPS (Advanced Mobile
Phone System, analog) • 1984 CT-1 standard (Europe) for cordless telephones
• 1986 C-Netz in Germany– analog voice, 450MHz, hand-over possible, digital signaling,
automatic location of mobile device– still in use today (as T-C-Tel), services: FAX, modem, X.25, e-
mail, 98% coverage
• 1991 Specification of DECT– Digital European Cordless Telephone (today: Digital Enhanced
Cordless Telecommunications) - ~100-500m range, 120 duplex channels, 1.2Mbit/s data
transmission, voice encryption, authentication
• 1992 Start of GSM – fully digital, 900MHz, 124 channels– automatic location, hand-over, cellular– roaming in Europe - now worldwide in more than 100 countries– services: data with 9.6kbit/s, FAX, voice, ...
• 1994 E-Netz in Germany– GSM with 1800MHz, smaller cells, supported by 11 countries
• 1996 HiperLAN (High Performance Radio Local Area Network)– standardization of type 1: 5.15 - 5.30GHz, 23.5Mbit/s– recommendations for type 2 and 3 (both 5GHz) and 4 (17GHz) as
wireless ATM-networks (up to 155Mbit/s)
• 1997 Wireless LAN - IEEE802.11– IEEE-Standard, 2.4 - 2.5GHz and infrared, 2Mbit/s– already many products (with proprietary extensions)
• 1998 Specification of GSM successors– for UMTS (Universal Mobile Telecommunication System) as European
proposals for IMT-2000
cellular phones satellites wireless LAN
cordlessphones
1992:GSM
1994:DCS 1800
2005?:UMTS/IMT-2000
1987:CT1+
1982:Inmarsat-A
1992:Inmarsat-BInmarsat-M
1998:Iridium
1989:CT 2
1991:DECT
199x:proprietary
1995/96/97:IEEE 802.11,HIPERLAN
2005?:MBS, WATM
1988:Inmarsat-C
analog
digital
1991:D-AMPS
1991:CDMA
1981:NMT 450
1986:NMT 900
1980:CT0
1984:CT11983:
AMPS
1993:PDC