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Region. TAXI. City. 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.

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Taxi region campus city in building

Region

TAXI

City

Campus

In-Building

Figure 1


Taxi region campus city in building

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


Taxi region campus city in building

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



Taxi region campus city in building

Received

Signal

Power

(dB)

10

0

dB With Respect

-10

to Average Value

-20

-30

0.5l

0

0.5

1

1.5

t, in seconds

0

10

20

30

x, in wavelength

Figure 5


Taxi region campus city in building

Received

Signal

Power

(dB)

With path loss and

shadow fading

With path loss, shadow

fading, and Rayleigh fading

With path loss

log (distance)

Figure 6


Taxi region campus city in building

Hierarchical

Star

Peer-to-Peer

Figure 7


Taxi region campus city in building

BASE

STATION

Figure 8