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2 edits | reply to BF69
Re: FUBAR Agree. The database will lag the real world. How do you access a database, without activating the modem to update the database? Unlicensed TVWS devices will be causing interference. They will be mobile, which means no way to triangulate on interference causing devices. No point of contact. No accountability. This is just going to be the 2.4GHz spectrum, with all its problems, on a 10 times larger slice of spectrum. | |
| Uh... keeping/creating a database whitespaces that exist within the TV band isn't impossible. The FCC knows all: transmitter locations, transmission powers, and approximate terrain. From there, just run some simulations to get a good idea of coverage areas (as other have done, which I assume the FCC has already done). Now you have a database of whitespace availability.
Accessing the database could be done by telling some stations to transmit a data stream on one of the ATSC multiplexes. Instant access to the database, in theory.
Getting a location fix is tougher. GPS may be expensive. Cell phone grid maybe better as sub-mile accuracy shouldn't be needed, just where is the nearest cell phone tower and that should be good enough. Autonomous detection of inuse TV station, microphones, and what not could be done (and probably will have to be done to some extent for wireless microphones), but riskier in terms of interference potential. | |
| said by cornelius785:Uh... keeping/creating a database whitespaces that exist within the TV band isn't impossible. The FCC knows all: transmitter locations, transmission powers, and approximate terrain. From there, just run some simulations to get a good idea of coverage areas (as other have done, which I assume the FCC has already done). Now you have a database of whitespace availability. Accessing the database could be done by telling some stations to transmit a data stream on one of the ATSC multiplexes. Instant access to the database, in theory. Getting a location fix is tougher. GPS may be expensive. Cell phone grid maybe better as sub-mile accuracy shouldn't be needed, just where is the nearest cell phone tower and that should be good enough. Autonomous detection of inuse TV station, microphones, and what not could be done (and probably will have to be done to some extent for wireless microphones), but riskier in terms of interference potential. Try again. The FCC's best simulations can never reflect the real world.
Longley-Rice maps are an approximation at best. | |
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