The Internet Encyclopedia (Volume 3)

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WIRELESSATM 827

Table 3Wireless LAN Standards

Standard Operating frequency Data rate Modulation Functionality

IEEE 802.11 Infrared Operating at a

wavelength

between 850 and

950 mm

Omni-directional;

range is up to

20 m; 1 Mbps, and

2-Mbps data rate

16-PPM (pulse

position

modulation)

Distribution service:

association,

disassociation,

reassociation,

distribution,

integration

FHSS Operating in the

2.4-GHz ISM band

Make use of a

multiple channels,

with single hopping

from one channel

to another based

on a pseudonoise

sequence. Data

rate is 1 Mbps and

allows for optional

2Mbps

2-level gaussian

frequency shift

keying (GFSK)

modulation for 1

Mbps; 4-level

GFSK for 2 Mbps

Station service:

authentication,

deauthentication,

privacy, data

delivery

DSSS Operating in the

2.4-GHz ISM band

Use up to 7 channels,

each with 1- and

2-Mbps data rates

Data rate of 1 Mbps

for DBPSK and 2

Mbps for DQPSK

Designed to be

mobile Ethernet

IEEE 802.11b DSSS schema 5–11 Mbps CCK

IEEE 802.11a Operating in 5-GHz

band, support

OFDM.

6, 9, 12, 18, 34, 36,

48, 54 Mbps

BPSK, QPSK,

16-QAM, 64-QAM

IEEE 802.16 Operating at 10–66

GHz frequency

range

QAM-64, QAM-16,

QPSK

Designed to be

wireless, but

stationary. Supports

heavy-duty

multimedia usage.

IEEE 802.16a Supports OFDM in

the frequency

range 2–11 GHz

IEEE 802.16b Operates in 5-GHz

ISM band

HiperLan 1 Provides up to

20-Mbps data rate

in the 5-GHz range

of the

radiofrequency (RF)

spectrum.

Can only use one

channel,

High-transmission

rate: 24 Mbps,

GMSK.

Low-transmission

rate: 1.47 Mbps,

FSK

For ad hoc

networking of

portable device.

Does not control or

guarantee QoS on

wireless link

HiperLan 2 Supports OFDM Up to 54 Mbps data

rate for short-range

(up to 150 m)

communication

BPSK, QPSK,

QAM-16, QAM-64

Support

asynchronous data

and time critical

services, efficient

QoS, ATM cells.

Typical application

include offices,

homes, exhibition

halls, airports, train

stations, and so on

provisioning of broadband services over wireless and

wireline networks, and ease of interfacing with the wired

networks systems that will form the telecommunications

backbone (Wasi, n.d.).

Adoption of an ATM compatible fixed-length cell-relay

format for PCN will result in a relatively transparent

interface to an ATM backbone. By using ATM switching

for intercell traffic, the crucial problem of developing a

new backbone network with sufficient throughput to sup-

port intercommunication among large numbers of small

cells is avoided. It is noted that for PCN micro- and pico-

cells with relatively low traffic volumes, rather than direct