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The Wireless Revolution:The Wireless Revolution:Perspectives and ChallengesPerspectives and Challenges
Lang TongLang TongCor Wit Professor, TU DelftCor Wit Professor, TU DelftCornell UniversityCornell UniversityIthaca, NY 14850Ithaca, NY [email protected]@ece.cornell.edu
View of DelftJan Vermeer
1632-1675
The Voice of the Air
Rene Magritte1898-1967
The Surprise Answer
Rene Magritte
AnxietyEdvard Munch(1863-1944)
FCC on AuctionFCC on Auction
“The upcoming auction is for prime beachfront property”
William E. KannardThe New York Times
December 8, 2000
The ScreamEdvard Munch
(1863-1944)
James G. HarbordJames G. Harbord
Words of James HarbordWords of James Harbord
““The ultimate achievement of communication The ultimate achievement of communication will come when we, at last, can see the will come when we, at last, can see the man who is talking to us even though he is man who is talking to us even though he is in a distant city, when we can watch every in a distant city, when we can watch every change of his expression, catch every tone change of his expression, catch every tone of his voice.”of his voice.”
James G HarbordNovember, 1935Brackett Lecture
Princeton University
A 19 Century DreamA 19 Century Dream
The 1970’s ExperimentThe 1970’s Experiment
La condition humaineRene Magritte
1898-1967
Video Phones in 2000Video Phones in 2000
Tandberg 7000.Max 3Mbps. $48,800
Internet Video Phone
Accordionist
Pablo Picasso1881-1973
A Failed PredictionA Failed Prediction
Is it the Cost?Is it the Cost?
?? 10 cents/min voice gives10 cents/min voice gives–– $4.70 per min (3Mbps)$4.70 per min (3Mbps)–– $2.35 per min (1.5Mbps)$2.35 per min (1.5Mbps)–– 5 cents/min voice 5 cents/min voice --> $1.20 per min> $1.20 per min
?? First transFirst trans--Atlantic voice: £5 per minAtlantic voice: £5 per min–– $130 per min. in today’s money.$130 per min. in today’s money.
Is it the Technology?Is it the Technology?
?? Circuit SwitchingCircuit Switching–– Take the data from video phoneTake the data from video phone
??WirelessWireless–– Wireless LAN, DSL, Cable.Wireless LAN, DSL, Cable.
The Shannon’s LawThe Shannon’s Law
Not Enough Capacity?Not Enough Capacity?
A single strand has the capacity of A single strand has the capacity of 100 Tbps=100,000,000,000 bits/sec100 Tbps=100,000,000,000 bits/sec
?? 50,000 simultaneous broadcast quality videos50,000 simultaneous broadcast quality videos?? 100 times more than “all the traffic loads of the 100 times more than “all the traffic loads of the
world’s communications networks put together in world’s communications networks put together in 1996.”1996.”
The Shannon’s LawThe Shannon’s Law
C=B log (1+SNR) bits/sec
B: BandwidthSNR: Signal-to-Noise Ratio
The Moore’s “Law”The Moore’s “Law”
The number of transistors per IC doubles every 18 months
All Those GsAll Those Gs
?? 1G1G: Analog Cellular (80’s): Analog Cellular (80’s)–– NMT450, NMT900, AMPS, Radio2000NMT450, NMT900, AMPS, Radio2000
?? 2G2G: 2: 2ndnd Generation Wireless (90’s)Generation Wireless (90’s)–– GSM, IS95 (CDMA), IS56 (TDMA), JPDGSM, IS95 (CDMA), IS56 (TDMA), JPD
?? 2.5G2.5G: GPRS, EDGE: GPRS, EDGE–– 144Kbps ~ 384K bps144Kbps ~ 384K bps
?? 3G3G: WCDMA, CDMA2000 : WCDMA, CDMA2000 –– 144Kbps ~ 384K bps < 2Mbps. Data144Kbps ~ 384K bps < 2Mbps. Data
?? 4G4G??
Cellular NetworkCellular Network
All Those GsAll Those Gs
?? 1G1G: Analog Cellular (80’s): Analog Cellular (80’s)–– NMT450, NMT900, AMPS, Radio2000NMT450, NMT900, AMPS, Radio2000
?? 2G2G: 2: 2ndnd Generation Wireless (90’s)Generation Wireless (90’s)–– GSM, IS95 (CDMA), IS56 (TDMA), JPDGSM, IS95 (CDMA), IS56 (TDMA), JPD
?? 2.5G2.5G: GPRS, EDGE: GPRS, EDGE–– 144Kbps ~ 384K bps144Kbps ~ 384K bps
?? 3G3G: WCDMA, CDMA2000 : WCDMA, CDMA2000 –– 144Kbps ~ 384K bps < 2Mbps. Data144Kbps ~ 384K bps < 2Mbps. Data
?? 4G4G??
Wireless LANWireless LAN
GSM-1800 Mobile
2360 2380 2400 2420 2460 2480 2500 2520 2560 2580MHz
The Industrial, Scientific and Medical (ISM) Band
Rate: 2-11 MbpsCost: $100~200
Ad Hoc NetworkingAd Hoc Networking
Sunday afternoon on the island of La Grande Jetta.
George Seurat
InfrastructureInfrastructure
Empire of LightsRene Magritte
Autumn RhythmJackson Pollock
1912-1956
Cocktail PartyAcrylic on Canvas
Mary Dodd
Archimedes’s Phase ArrayArchimedes’s Phase Array
The Engineer’s Place in WirelessThe Engineer’s Place in Wireless
Sun FlowersVincent van Gogh
1869-1890