07-04-2012, 01:20 PM
WORLDWIDE INTEROPERABILITY FOR MICROWAVE ACCESS (WIMAX)
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1 Abstract
This paper presents the features of the
Worldwide for Microwave Interoperability
Access (WiMAX) technology and
pretends to establish some valid criterions
for future trends of possible applications of
WiMAX. A discussion is given by
comparing Wireless Fidelity (Wi-Fi) and
WiMAX. Several references have been
included at the end of the article for those
willing to know in detail about certain
specific topics.
2. Introduction
Broadband technology has rapidly become
a need for all the population. Internet
Service Providers (ISPs) have dealt with
all sorts of challenges in order to deliver
broadband solutions. In this sense, Digital
Subscriber Line (DSL) technology has
appeared as a pioneer solution. However,
coverage in wire line services is bounded
and quality is another big issue. Wireless
systems are an old solution that had been
displaced for its limits in bandwidth,
LoS and the fact of delivering a cost
effective solution.
Since a few years ago, when Wi-Fi was
standardized and also its products
regulated and certified by the Wi-Fi
Forum, different solutions have come into
the market. Despite Wi-Fi was developed
thinking in LAN solutions, it has been also
used in MAN solutions but with
a lot of limitations in its performance and
certainly with trade-offs (bandwidth,
coverage, power consumption).
WiMAX is coming to fix this need and
deliver new broadband solutions for all the
ISPs and WIPSs that was harassed by the
users’ needs of counting with more
broadband for their different applications.
WiMAX is defined as Worldwide
Interoperability for Microwave Access by
the WiMAX Forum, formed in June 2001
to promote conformance and
interoperability of the IEEE 802.16
standard, officially known as Wireless
MAN. The Forum describes WiMAX as "a
standards-based technology enabling the
delivery of last mile wireless broadband
access as an alternative to cable and DSL".
"WiMAX is not a technology, but
rather a certification mark, or
'stamp of approval' given to
equipment that meets certain
conformity and interoperability
tests for the IEEE 802.16 family of
standards. A similar confusion
surrounds the term Wi-Fi, which
like WiMAX, is a certification mark
for equipment based on a different
set of IEEE standards from the
802.11 working group for wireless
local area networks (WLAN).
Neither WiMAX, nor Wi-Fi is a
technology but their names have
been adopted in popular usage to
denote the technologies behind
them. This is likely due to the
difficulty of using terms like 'IEEE
802.16' in common speech and
writing."
3. 802.16 /HiperMAN
Technology Specs
• Based on IEEE 802.16 and ETSI
HiperMAN, WiMAX selected the
common mode of operation of
these two standards — 256FFT
OFDM.
WORLDWIDE INTEROPERABILITY
FOR MICROWAVE ACCESS (WIMAX)
Sri Vidyanikethan Engineering College
K.Rakesh lal, II ECE A 06121A0468, - k.rakeshlal[at]live.in
A.Venkata Sai Vivek,II ECE 06121A04B2B -vivek.venkatasai[at]gmail.com
• Concentrated in 2- to 11-GHz
WMAN, with the following set of
features: