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bluetooth technology

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rahila

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the distance to which any wave can propagate is directly proportional to the frequency of the wave(in the sense that the distance increases with frequency) then why the the distance to which we can transfer data using bluetooth technology is limited?
 
Refer to the Friis Equation ( Friis transmission equation - Wikipedia, the free encyclopedia ) for the relationship between distance and wavelength. Note that distance is proportional to wavelength, not frequency. The distance that any radio wave can carry information is fundamentally limited by the losses due to propagation and by the noise floor power in the receiver. All receivers have a bottom limit of input power below which they cannot decode the incoming data. This bottom limit can be referred to as the receiver sensitivity and it exists because the receiver has a fixed thermal noise power.
 
Those equations are based on ideal circumstances that don't occur in the real world. Between multipath problems, and the fact that with increasing frequency physical objects even those that aren't good conductors blocking the signal, it's amazing wi-fi works as well as it does.
 
Quite true. Not only does WiFi work surprisingly well, all things considered, but it is even more amazing to see how much of an improvement you get when upgrading to 802.11n from the previous standards like a,b, and g. Ironically, one of the major reasons that it does is thanks to multipath.
 
Yeah, I know the n standard really redid the front end of the receiver which is where most of the improvements came from. I'm still using G, but that's only cause it was free equipment and it's just my step sons internet connection two rooms away. Encoding for digital radio signals has come a long LONG way in the last 5-10 years, we're just about at the limit of being able to squeeze after last theoretically possible bit out of the airwaves we have, which is good cause we need every bit we can get!
 
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