پاورپوینت بررسی شبکه های سلولی موبایل

پاورپوینت بررسی شبکه های سلولی موبایل

پاورپوینت بررسی شبکه های سلولی موبایل

پاورپوینت بررسی شبکه های سلولی موبایل

تعداد اسلاید: ۵۱
 
History of wireless communication
n1897: Marconi demonstrated transmission of radio waves to a ship at sea 29 km away
n1915: Wireless telephony established– Virginia and Paris
n1920s: Radio broadcasting became popular
n1930s: TV broadcasting began
n1946: First public mobile telephone service in US
n1960s: Bell Labs developed cellular concept– brought mobile telephony to masses
n1960’s: Communications satellites launched
nLate 1970s: IC technology advances enable affordable cellular telephony– ushers in modern cellular era
 
 

Modern cellular standards

n1979: NTT (Japan), FDMA, FM, 25 kHz channels, 870-940 MHz
n1983: AMPS (US), FDMA, FM, 30 kHz channels, 824-894 MHz
n1985: TACS (Europe), FDMA, FM, 25 kHz channels,…