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Wireless Broad Band Modems:
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Wireless broadband Internet access uses many frequency bands.Wireless
Broadband modems offer similar performance to cable modems operating over
Wired cable television systems(CATV),but the business is easier to enter as the
Transmitters cover an entire city or region.
A broadband wireless system can deliver up to 30-Mbps data capacity in a 6-MHz
Channel.The wireless system’s strength is that it can quickly provide high burst
speed Internet access to a 10-mile,20-mile,or 35-mile radius depending on the
frequency band used.This allows the service provider to work with or compete
with CATV to serve small-sized and medium-sized business and high-end users.
The CATV coaxial-cable plant typically services residential neighborhoods and
may not serve these premium customers.Wireless impose special requirements
on the technology and business relationships.
Engineering of a wireless system is complicated by
several factors:
The physical wireless-transmitter location may be different from the
Internet head-end location.
LOS transmission is required.
The signal power falls with distance.
Differently fixed transmission frequencies are used according to license
availability.
multipath distortion.
Source: Alcatel corporation*
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