Multi-user detection method with accelerated sphere decoding

Details Multi-user detection method with accelerated sphere decoding Multi-user detection method with accelerated sphere decoding

2007-06-12

2007-06-12

Payne, David C. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000

Reexamination Certificate

active

10421912

ABSTRACT:
A method is provided for detecting a plurality of symbols (dk(i)) transmitted by or for a plurality K of users, each symbol belonging to a modulation constellation. Filtering of a received signal is performed for supplying a vector (z) each component of which being related to a user. The closest neighbor of the vector is searched among candidates belonging to a lattice of points generated by the modulation constellations. The search is limited to a volume centered around the vector and is carried out by sequentially selecting a coordinate (bk) of a candidate for each dimension of the vector. The components of the vector are recorded according to an ordering rule prior to the search, the ordering rule being chosen so as to eliminate a higher rate of candidates for a first dimension than for a subsequent dimension to be searched.

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