Accelerated method of detection by spheres

Details Accelerated method of detection by spheres Accelerated method of detection by spheres

2006-04-04

2006-04-04

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S148000, C375S262000, C375S341000

Reexamination Certificate

active

07023898

ABSTRACT:
A method of detecting a plurality of symbols (dk(i)) transmitted by or for a plurality K of users, each symbol belonging to a modulation constellation and being the subject of a spectral spreading by means of a spreading sequence, the method including a filtering step adapted for supplying a real vector (z) characteristic of the received signal, at least the closest neighbor of the vector being sought within a lattice of points (Ξ) generated by the modulation constellations, the search being limited to candidate vectors (x), each of whose components (bi) has a value lying within a search interval defined by a lower bound (Bi−)and an upper bound (Bi+), the bounds being chosen so that each of the intervals comprises only component values of points situated within a sphere with a predetermined radius (√{square root over (C)}) and belonging to a modulation constellation.

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