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why 3.5GHz band is popular for wimax?
1 Reply

Would someone let me know, why 3.5GHZ band is popular for wimax? I mean, how does it provide interference free propagation of signal,better quality of service? How does this band reduce/eliminate…Continue

Started this discussion. Last reply by Rizwan Abbas Jan 18, 2011.

why 3.5ghz band is popular for wimax?

Would someone let me know, why 3.5GHZ band is popular for wimax? I mean, how does it provide interference free propagation of signal,better quality of service? How does this band reduce/eliminate…Continue

Started Jan 12, 2011

why 3.5ghz is popular for wimax?

Would someone let me know, why 3.5GHZ band is popular for wimax? I mean, how does it provide interference free propagation of signal,better quality of service? How does this band reduce/eliminate…Continue

Started Jan 12, 2011

why 3.5ghz is popular for wimax?

Would someone let me know, why 3.5GHZ band is popular for wimax? I mean, how does it provide interference free propagation of signal,better quality of service? How does this band reduce/eliminate…Continue

Started Jan 12, 2011

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Eligible propagation model-which one?

Can anybody name me the propagation models for wimax which will be suitable to predict path loss at 2.5GHz and 3.5GHz? And please mention the parameters that should be taken into account while simulation.

Posted on February 4, 2011 at 12:29pm — 1 Comment

Why 3.5GHz band is popular for wimax around the world?

Would someone let me know, why 3.5GHZ band is popular for wimax? I mean, how does it provide interference free propagation of signal,better quality of service? How does this band reduce/eliminate interference? Please explain. At which frequency do the interference begin and at which frequency do the interference starts to mitigate or vanish for wimax? What about the frequencies higher than 3.5GHZ regarding interference? Please reply soon. Thanks to all.

Posted on January 12, 2011 at 12:50am

Comment Wall (3 comments)

At 6:59am on January 12, 2011, Yahya Khaled said…

Well... 1st of all, the spectrum is a very scarce and expensive resource and its far more than just interference as a factor to contribute to the decision-making process when deciding what portion or what band to allocate to a specific technology.

There are all sort of economics and sometimes politics when deciding on a frequency band. I'll give you some technical overview on how to decide a suitable band, and thats my opinion and understanding off-course!!

High frequency band = major propagation losses; free space and absorption

Usually used in line-of-sight environments, microwave links is a good example. Although high frequency means multiple paths for me in a urban environments; but its not practical due to the expensive propagation losses.

Low frequency band = Big antennas, sometimes very bid antennas !!, fewer propagation losses but not practical for handheld devices, radio and analog TV are good examples.

 

Now in between these categories there are good frequencies that have reasonable propagation losses, suitable multi-path characteristics (No line of sight required), integrated antenna design and low complexity..

Now, you need to understand that spectrum managers and regulators like ITU cant just ground one band and use another one!! there is already a massive investment in previous technologies and they can just chose the best band!!! they have to compromise and find a compromise solution. Otherwise, No one would consider investment in this technology (economical). 

From this, they start looking at neighboring technologies that co-exist on the same spectrum (sometimes) or that are adjacent with potential out-of-band emissions.

 

You cant just think of interference because, in my opinion, could be managed with stringent technical specifications and proper planning.

 

At 7:06am on January 12, 2011, Yahya Khaled said…
I will have a look at the band allocation chart to identify the surrounding technologies. Probably  some satellite broadcast services in some countries, not quite sure.
At 5:15pm on January 15, 2011, Saad Ullah Soomrani said…

3.5GHZ band is popular for wimax because in order to avoid interference in the network and to achieve better RAN KPI values, we could move to a 4‐frequency plan from a 3‐Frequency plan. After the execution of 4‐Frequancy plan, we could be able to enhance our Effective Isotropic Radiated Power (EIRP) to the maximum level (384 dBm); in this way it could provide interference free propagation of signal, provide better quality of service and this band reduce/eliminate interference due this execution of 4-Frequency plan.

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