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اسلاید 1 :

History of  wireless commu icatio

1897: Marco i demo strated tra smissio of radio waves to a ship at sea 29 km away

1915: Wireless telepho y established-- Virgi ia a d Paris

1920's: Radio broadcasti g became popular

1930's: TV broadcasti g bega

1946: First public mobile telepho e service i US

1960's: Bell Labs developed cellular co cept-- brought mobile telepho y to masses

1960’s: Commu icatio s satellites lau ched

Late 1970's: IC tech ology adva ces e able affordable cellular telepho y-- ushers i moder cellular era

اسلاید 2 :

Moder cellular sta dards

1979: TT (Japa ), FDMA, FM, 25 kHz cha els, 870-940 MHz

1983: AMPS (US), FDMA, FM, 30 kHz cha els, 824-894 MHz

1985: TACS (Europe), FDMA, FM, 25 kHz cha els, 900 MHz

1990: GSM (EuropeTDMA, GMSK, 200 kHz cha els, 890-960 MHz

1991: USDC/IS-54 (), US), TDMA, p/4 DQPSK, 30 kHz cha els, 824-894 MHz

1993: IS-95 (US), CDMA, BPSK/QPSK, 1.25 MHz cha els, 824-894 MHz a d 1.8-2.0 GHz

1993: CDPD (US), ) Cellular Digital Packet Data(: FHSS, GMSK, 30 kHz cha els, 824-894 Mhz

2001: UMTS/IMT-2000 (3rd ge eratio Europea cellular sta dard), supports data a d voice (up to 2 Mbps), 1885-2025 MHz a d 2110-2200 Mhz

اسلاید 3 :

Wireless data sta dards

IEEE 802.11: wireless LA /ad-hoc etworki g, 1, 2 or 11 Mbps, DSSS or FHSS with CSMA/CA RTS-CTS-ACK, 2.4 - 2.4835 GHz

Bluetooth: replaceme t for cables, short ra ge (10 or 100 m), low power (1 or 100 mW), low cost, 1 Mbps max data rate, local pico ets with master-slave operatio

HomeRF: wireless home etworki g, 150 feet ra ge, up to 10 devices, SWAP protocol

IEEE 802.15: wireless PA , modes for low (< 10 kbps), medium (up to 200 kbps), a d high (> 20 Mbps) data rates

اسلاید 4 :

Facts about wireless commu icatio

Over 50% of US households have a cellular pho e by 2003

Over 170M wireless data users(2003); projected to reach 1.3 billio by 2004

Over 200M mobile pho e subscribers i Wester Europe

Global reve ue from wireless portals predicted to grow from $700M to $42 billio by 2005

Worldwide wireless subscribers to reach 1 billio by Q3 2002

WLA reve ues predicted at $785M by 2004

Forecasti g a 59 perce t growth rate for wireless usage i rural areas betwee 2000 a d 2003

اسلاید 5 :

U derlyi g co cepts

Electromag etics

A te as, wave propagatio , cha el modeli g

Sig als a d systems

Filteri g, Fourier tra sforms, block-diagram desig

Digital sig al processi g

Equalizatio , spread-spectrum, source codi g

Commu icatio s

Modulatio , oise a alysis, cha el capacity, cha el codi g

اسلاید 6 :

Digital i tegrated circuits

RF ge eratio devices (efficie t power amps, sleep modes, improved oscillators, smart a te as)

Source codi g (data compressio )

Modulatio (improved efficie cy)

Multiple-access tech iques (i crease umber of users)

Cha el codi g/forward error correctio (improve probability of successful receptio )

Software programmable radios

اسلاید 7 :

سلولهاي راديويي منفرد

• پليس
• آتش نشاني
• تاكسي
• راديو و تلويزيون
• اورژانس

اسلاید 8 :

شبكه راديويي

اسلاید 9 :

 شبكه موبايل پايه

اسلاید 10 :

اصطلاحات

آمريكا: Cellular System-Cell Pho e

اروپا: Mobile Commu icatio System-Mobile pho e