لینک دانلود و خرید پایین توضیحات دسته بندی : ppt نوع فایل : powerpoint (..ppt) ( قابل ويرايش و آماده پرينت ) تعداد اسلاید : 51 اسلاید
قسمتی از متن powerpoint (..ppt) :
به نام خدا بررسی شبکه های سلولی موبایل History of wireless communication 1897: Marconi demonstrated transmission of radio waves to a ship at sea 29 km away 1915: Wireless telephony established-- Virginia and Paris 1920's: Radio broadcasting became popular 1930's: TV broadcasting began 1946: First public mobile telephone service in US 1960's: Bell Labs developed cellular concept-- brought mobile telephony to masses 1960’s: Communications satellites launched Late 1970's: IC technology advances enable affordable cellular telephony-- ushers in modern cellular era Modern cellular standards 1979: NTT (Japan), FDMA, FM, 25 kHz channels, 870-940 MHz 1983: AMPS (US), FDMA, FM, 30 kHz channels, 824-894 MHz 1985: TACS (Europe), FDMA, FM, 25 kHz channels, 900 MHz 1990: GSM (EuropeTDMA, GMSK, 200 kHz channels, 890-960 MHz 1991: USDC/IS-54 (), US), TDMA, p /4 DQPSK, 30 kHz channels, 824-894 MHz 1993: IS-95 (US), CDMA, BPSK/QPSK, 1.25 MHz channels, 824-894 MHz and 1.8-2.0 GHz 1993: CDPD (US), ) Cellular Digital Packet Data ( : FHSS, GMSK, 30 kHz channels, 824-894 Mhz 2001: UMTS/IMT-2000 (3rd generation European cellular standard), supports data and voice (up to 2 Mbps), 1885-2025 MHz and 2110-2200 Mhz Wireless data standards IEEE 802.11: wireless LAN/ad-hoc networking, 1, 2 or 11 Mbps, DSSS or FHSS with CSMA/CA RTS-CTS-ACK, 2.4 - 2.4835 GHz Bluetooth: replacement for cables, short range (10 or 100 m), low power (1 or 100 mW), low cost, 1 Mbps max data rate, local piconets with master-slave operation HomeRF: wireless home networking, 150 feet range, up to 10 devices, SWAP protocol IEEE 802.15: wireless PAN, modes for low ( 20 Mbps) data rates
لینک دانلود و خرید پایین توضیحات دسته بندی : ppt نوع فایل : powerpoint (..ppt) ( قابل ويرايش و آماده پرينت ) تعداد اسلاید : 51 اسلاید
قسمتی از متن powerpoint (..ppt) :
به نام خدا بررسی شبکه های سلولی موبایل History of wireless communication 1897: Marconi demonstrated transmission of radio waves to a ship at sea 29 km away 1915: Wireless telephony established-- Virginia and Paris 1920's: Radio broadcasting became popular 1930's: TV broadcasting began 1946: First public mobile telephone service in US 1960's: Bell Labs developed cellular concept-- brought mobile telephony to masses 1960’s: Communications satellites launched Late 1970's: IC technology advances enable affordable cellular telephony-- ushers in modern cellular era Modern cellular standards 1979: NTT (Japan), FDMA, FM, 25 kHz channels, 870-940 MHz 1983: AMPS (US), FDMA, FM, 30 kHz channels, 824-894 MHz 1985: TACS (Europe), FDMA, FM, 25 kHz channels, 900 MHz 1990: GSM (EuropeTDMA, GMSK, 200 kHz channels, 890-960 MHz 1991: USDC/IS-54 (), US), TDMA, p /4 DQPSK, 30 kHz channels, 824-894 MHz 1993: IS-95 (US), CDMA, BPSK/QPSK, 1.25 MHz channels, 824-894 MHz and 1.8-2.0 GHz 1993: CDPD (US), ) Cellular Digital Packet Data ( : FHSS, GMSK, 30 kHz channels, 824-894 Mhz 2001: UMTS/IMT-2000 (3rd generation European cellular standard), supports data and voice (up to 2 Mbps), 1885-2025 MHz and 2110-2200 Mhz Wireless data standards IEEE 802.11: wireless LAN/ad-hoc networking, 1, 2 or 11 Mbps, DSSS or FHSS with CSMA/CA RTS-CTS-ACK, 2.4 - 2.4835 GHz Bluetooth: replacement for cables, short range (10 or 100 m), low power (1 or 100 mW), low cost, 1 Mbps max data rate, local piconets with master-slave operation HomeRF: wireless home networking, 150 feet range, up to 10 devices, SWAP protocol IEEE 802.15: wireless PAN, modes for low ( 20 Mbps) data rates
لینک دانلود و خرید پایین توضیحات دسته بندی : ppt نوع فایل : powerpoint (..ppt) ( قابل ويرايش و آماده پرينت ) تعداد اسلاید : 51 اسلاید
قسمتی از متن powerpoint (..ppt) :
به نام خدا بررسی شبکه های سلولی موبایل History of wireless communication 1897: Marconi demonstrated transmission of radio waves to a ship at sea 29 km away 1915: Wireless telephony established-- Virginia and Paris 1920's: Radio broadcasting became popular 1930's: TV broadcasting began 1946: First public mobile telephone service in US 1960's: Bell Labs developed cellular concept-- brought mobile telephony to masses 1960’s: Communications satellites launched Late 1970's: IC technology advances enable affordable cellular telephony-- ushers in modern cellular era Modern cellular standards 1979: NTT (Japan), FDMA, FM, 25 kHz channels, 870-940 MHz 1983: AMPS (US), FDMA, FM, 30 kHz channels, 824-894 MHz 1985: TACS (Europe), FDMA, FM, 25 kHz channels, 900 MHz 1990: GSM (EuropeTDMA, GMSK, 200 kHz channels, 890-960 MHz 1991: USDC/IS-54 (), US), TDMA, p /4 DQPSK, 30 kHz channels, 824-894 MHz 1993: IS-95 (US), CDMA, BPSK/QPSK, 1.25 MHz channels, 824-894 MHz and 1.8-2.0 GHz 1993: CDPD (US), ) Cellular Digital Packet Data ( : FHSS, GMSK, 30 kHz channels, 824-894 Mhz 2001: UMTS/IMT-2000 (3rd generation European cellular standard), supports data and voice (up to 2 Mbps), 1885-2025 MHz and 2110-2200 Mhz Wireless data standards IEEE 802.11: wireless LAN/ad-hoc networking, 1, 2 or 11 Mbps, DSSS or FHSS with CSMA/CA RTS-CTS-ACK, 2.4 - 2.4835 GHz Bluetooth: replacement for cables, short range (10 or 100 m), low power (1 or 100 mW), low cost, 1 Mbps max data rate, local piconets with master-slave operation HomeRF: wireless home networking, 150 feet range, up to 10 devices, SWAP protocol IEEE 802.15: wireless PAN, modes for low ( 20 Mbps) data rates