WIMAXWIMAX

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INTRODUCTIONINTRODUCTION WIMAX-The worldwide Interoperability WIMAX-The worldwide Interoperability

for microwave access. for microwave access.

It is based on the IEEE 802.16 standard , It is based on the IEEE 802.16 standard , which is also called wireless MAN.which is also called wireless MAN.

The name WIMAX was created by the The name WIMAX was created by the WIMAX-forum, which was formed in June WIMAX-forum, which was formed in June 2001 to promote conformance and 2001 to promote conformance and interoperability of the standard.interoperability of the standard.

DEFINATION:-DEFINATION:-

802.16802.16it is not the actual standard .The is it is not the actual standard .The is correctly called 802.16.2004 correctly called 802.16.2004

802.16e802.16eIt is amendment to 802.16-2004.It is It is amendment to 802.16-2004.It is properly referred to as 802-16e-2005properly referred to as 802-16e-2005

FIXED WIMAXFIXED WIMAX Systems built using 802.16-2004 Systems built using 802.16-2004 as air interface technology.as air interface technology.

Mobile WIMAXMobile WIMAX System built using 802-16-2005 System built using 802-16-2005 as air technology.as air technology.

USES:USES:

Connecting wi-fi hot spots with each other Connecting wi-fi hot spots with each other and to other parts of the internet.and to other parts of the internet.

Providing a wireless alternative to cable Providing a wireless alternative to cable and DSL for last mile (last km) broadband and DSL for last mile (last km) broadband access.access.

Providing high speed data and Providing high speed data and telecommunication series.telecommunication series.

Providing normadic connectivity. Providing normadic connectivity.

BRAOD BAND ACCESS:-BRAOD BAND ACCESS:- Many companies are closely examining WIMAX for Many companies are closely examining WIMAX for

“last mile” connectivity at high data rates. “last mile” connectivity at high data rates. It could result in lower pricing for both home and It could result in lower pricing for both home and

business customers as competition lower prices.business customers as competition lower prices. SUBSCRIBERS UNITSSUBSCRIBERS UNITS:-:- Indoor version.Indoor version. Outdoor version. Outdoor version. MOBILEMOBILE APPLICATIONAPPLICATION:-:- Cellular companies are evaluating WIMAX as a Cellular companies are evaluating WIMAX as a

means of increasing band width for a variety of means of increasing band width for a variety of data intensive applications.data intensive applications.

WIMAX can enhance wireless infrastructure in an WIMAX can enhance wireless infrastructure in an inexpensive way. inexpensive way.

TECHNICAL INFORMATIONTECHNICAL INFORMATION WIMAX is very different from WI-FI in the way WIMAX is very different from WI-FI in the way

it works.it works. MAC (media access controller)-It provides MAC (media access controller)-It provides

addressing and channel access control addressing and channel access control mechanisms.mechanisms.

PHYSICAL LAYERPHYSICAL LAYER 80.2.16-2004 was80.2.16-2004 was updated to 802-16-2005 updated to 802-16-2005

and uses scalable orthogonal frequency and uses scalable orthogonal frequency division multiple access (SOFDMA) as opposed division multiple access (SOFDMA) as opposed to the OFDM version (256 sub carriers).to the OFDM version (256 sub carriers).

It also uses multiple antenna support through It also uses multiple antenna support through MIMO (multiple input multiple output MIMO (multiple input multiple output communications).communications).

SPECTRUM ALLOCATION ISSUESSPECTRUM ALLOCATION ISSUES The 802.16 specification applies across The 802.16 specification applies across

a wide swath of the RF spectrum.a wide swath of the RF spectrum. There is no uniform global licensed There is no uniform global licensed

spectrum for WIMAX.spectrum for WIMAX. US will 2.5 GHz and Asian countries like US will 2.5 GHz and Asian countries like

India ,Vietnam and Indonesia will use India ,Vietnam and Indonesia will use 3.3 3.3

GHz.GHz. Manufactures are compelled to provide Manufactures are compelled to provide

multi-spectrum devices.multi-spectrum devices. WIMAX has advantage of spectral WIMAX has advantage of spectral

efficiency. (WIMAX—spectral efficiency efficiency. (WIMAX—spectral efficiency is 3.7 bits/s/Hz). (WI-FI—spectral is 3.7 bits/s/Hz). (WI-FI—spectral efficiency is less than 1 bit/s/Hz).efficiency is less than 1 bit/s/Hz).

SILICON IMPLEMENTATIONSILICON IMPLEMENTATION Requirement of low cost chipsets .Requirement of low cost chipsets . Intel is a leader in promoting WIMAX and Intel is a leader in promoting WIMAX and

developed its own chipsets.developed its own chipsets. Some of the other semiconductor Some of the other semiconductor

companies which work on WIMAX are-companies which work on WIMAX are-[Alter, Beceen, GCI, Runcom, picochip [Alter, Beceen, GCI, Runcom, picochip (chipsets for base station)].(chipsets for base station)].

Comparison with wi-fiComparison with wi-fi WIMAX is a long range system that uses WIMAX is a long range system that uses

licensed or unlicensedlicensed or unlicensed spectrum. spectrum. Wi-fi is a short range system that Wi-fi is a short range system that

uses unlicensed spectrum uses unlicensed spectrum . .

LIMITATIONLIMITATION A commonly held misconception is that WIMAX will

deliver 70 bits/sec over 30 miles. WIMAX devices typically have an antenna which is

of lower gain by nature due to their inherent omni directional design.

COMPETING TECHNOLOGIES WIMAX main competition comes from existing

deployed wireless system such as1. UMTS2. CDMA 20003. HIPERMAN4. WIBRO(S.KOREAN)

REFERENCESREFERENCES

www.wikipedia.org www.wikipedia.org www.wimaxforum.orgwww.wimaxforum.org

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