SpotFi, ArrayTrack and LTEye are proposed solutions which employ this kind of technique.

Typical computation of the AoA is done with the MUSIC algorithm. Assuming an antenna array of antennas equally spaced by a distance of and a signal arriving at the antenna array through propagation paths, an additional distance of is traveled by the signal to reach the second antenna of the array.

Considering that the -th propagation path arrives with angle with respect to the normal of the

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