Patent ID: 7023898

Claim:
Method of detecting a plurality of symbols (d k (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 comprising a filtering step adapted for supplying a real vector (z) characteristic of a received signal, wherein at least the closest neighbour of the vector is sought within a lattice of points (Ξ) generated by said modulation constellations, the search being limited to candidate vectors (x), each of whose components (b i ) has a value lying within a search interval defined by a lower bound (B i − ) and an upper bound (B i + ), 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.