seminar on white space technology
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hi am Harika i would like to get the details of seminar on tv white space technology
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#2

In telecommunications blanks refer to frequencies assigned to a broadcasting service but are not used locally. National and international agencies assign different frequencies for specific uses and, in most cases, license transmission rights through these frequencies. This frequency assignment process creates a band plan, which for technical reasons allocates blank space between bands or radio channels used to avoid interference. In this case, while the frequencies are not used, they have been assigned specifically for a purpose, such as a guard band. More commonly, however, these blanks exist naturally among the channels used, since assigning transmissions near the immediately adjacent channels will cause destructive interference to both. In addition to the allocated blank space for technical reasons, there is also an unused radio spectrum that has never been used or is being released as a result of technical changes. In particular, switching to digital television releases large areas between approximately 50 MHz and 700 MHz. This is because digital transmissions can be packaged in adjacent channels, while analog transmissions can not. This means that the band can be "compressed" into fewer channels, while allowing more broadcasts.

In the United States, abandoned television frequencies are mainly found in the upper UHF "700 megahertz" band, which covers television channels 52 to 69 (698 to 806 MHz). American television and its blank spaces will continue to exist in UHF frequencies, as well as in VHF frequencies for which mobile users and white space devices require larger antennas. In the rest of the world, the abandoned television channels are VHF, and the resulting large VHF blank spaces are being reassigned to the worldwide digital radio standard (except US) DAB and DAB + and DMB.
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