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Posted by on Sep 11, 2012 in Technology |

Researchers propose a model of Wi-Fi in the UHF band

Researchers propose a model of Wi-Fi in the UHF band

If you often have a common point in most events held is that the usually fail (especially at the beginning, just as the flood lands of attendees). Wi-Fi networks have given us a lot of flexibility in both homes and offices and, in fact, thanks to some establishments offering hotspots, we have coffee and work as if we were in the office and are so widespread in use, to sometimes cause interference that may cause us other neighboring networks occasional headache. In fact, in the ISM band (2.4 GHz) addition signals can be found Wi-Fi and Bluetooth signals although the 5 GHz band may also be used for Wi-Fi communications, the higher the frequency the greater the attenuation suffered by the signal to pass obstacles (eg a wall).

With the aim of optimizing the use of the spectrum and, incidentally, work on a new wireless communication standard with which to increase the transmission rate and coverage, a team of the Department of Electrical and Computer Engineering from the University of Wisconsin-Madison is proposing a model that aims to reuse unused frequency bands UHF , specifically in the 180 MHz band

The band, which is used for digital radio and television, has some slots reserved spectrum separation between channels to avoid signal interference and other emissions not overlap or, for example, with devices that operate at this frequency as some wireless microphones. This “white space” is precisely the reuse posed from the team of Professor Parmesh Ramanathan.

And how can they improve data communications in the 180 MHz band? For starters, the bandwidth is 5 times higher than in conventional Wi-Fi channels, so that the rate of sending information could increase significantly but, most importantly, is that the UHF band would greatly expand the coverage of this Such networks because the signal attenuation is lower than in the GHz band:

TV signals propagate well through the walls [...] The higher the frequency the smaller the signal propagation

However, this type of theoretical approaches is not easy to implement since it requires new regulations for releasing these guard channels that are currently unused and precisely such movements are not something fast (usually go through bodies such as the ITU , ETSI , the involvement of manufacturers, etc.). Still, the research team is looking to technology that could be used to bring this new communication standard practice and even raise the frequency reuse or demand allocation of frequency bands:

This is a preview of how it will change the way we manage the spectrum [...] The mobile operators could use frequency bands temporarily, for example, for a specific event and, once it is complete, the same channels could be reused by emergency crews or security forces

Perhaps this kind of ideas do not reach and are implemented as a theoretical research but certainly a number of frequency assignments that were made 20 or 30 years perhaps could be revised to optimize the use of the and lead to new services (although, sometimes, these movements involve having to make adjustments to the receiving systems users ).

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