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Region TAXI City laptops, PDAs Campus In-Building Figure 1 100 USA market 90 80 70 cellular + PCS subs Internet users 60 millions 50 paging subs 40 30 dedicated wireless laptop users data subs 20 10 annual laptop sales 0 1995 2000 Figure 2 LOCAL AREA PACKET SWITCHING

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Presentation Transcript
slide1
Region

TAXI

City

laptops, PDAs

Campus

In-Building

Figure 1

slide2
100

USA market

90

80

70

cellular + PCS subs

Internet users

60

millions

50

paging subs

40

30

dedicated wireless

laptop users

data subs

20

10

annual laptop sales

0

1995

2000

Figure 2

slide3
LOCAL AREA PACKET SWITCHING

WIDE AREA CIRCUIT SWITCHING

ATM

ATM

100 M

100,000

100,000

Ethernet

10,000

10,000

FDDI

wired- wireless

bit-rate "gap"

Ethernet

wired- wireless

User

User

1000

1000

bit-rate "gap"

ISDN

Bit-Rate

Bit-Rate

2nd gen

WLAN

(kbps)

(kbps)

100

100

28.8 modem

1st gen

WLAN

32 kbps

Polling

9.6 modem

PCS

14.4

digital

cellular

10

10

9.6 cellular

2.4 modem

Packet

2.4 cellular

1

1

Radio

.1

.1

.01

.01

1970

1980

1990

2000

1970

1980

1990

2000

YEAR

YEAR

Figure 3

slide5
10

0

dB With Respect

-10

to RMS Value

-20

-30

0.5l

0

0.5

1

1.5

t, in seconds

0

10

20

30

x, in wavelength

Figure 5

slide6
Received

Signal

Power

(dB)

path loss

shadow fading

Rayleigh fading

log (distance)

Figure 6

slide7
Hierarchical

Star

Peer-to-Peer

Figure 7

slide8
BASE

STATION

Figure 8

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