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egaebel / lgtm

The code for my thesis project, Looks Good to Me (LGTM), Authentication for Augmented Reality. This is a full implementation of LGTM that localizes a wireless transmitter, and searches for a specific face at that location to authenticate two users trying to establish secure point to point communication.
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how to assign values for tau? #6

Open siningsun opened 7 years ago

siningsun commented 7 years ago

Hey guys, I just found out that if I choose different sets of values for tau in the function"aoa_of_music",I get different results. Should tau be determined with regard to the physical distance between transmitter and receiver?

lax7 commented 7 years ago

Hi siningsun, did you find how to assign the value of tau?

egaebel commented 7 years ago

You shouldn't assign a value for tau. You should iterate over a range of realistic values (overestimating is better than underestimating) and then SpotFi will peak at the correct value of tau (lets call it T) and all values of tau equal to T * 2pi

I'd suggest spending some more time with the math from the SpotFi paper

https://web.stanford.edu/~skatti/pubs/sigcomm15-spotfi.pdf

whubaichuan commented 6 years ago

@siningsun @laxima Has anybody get over the problem?