Method of conjoint detection of a set of CDMA codes
AssigneeFrance Telecom
InventorYvan Pigeonnat
Life of this patent
Estimating the term…
Abstract
A method of conjoint detection of a set of CDMA codes received at a plurality of antennas of a receiver like a mobile telephone receiver. The codes are transmitted via a transmission channel with transfer matrix A satisfying the equation e=A.d+n, where d is the set of symbols of the codes transmitted, n is an additional noise vector and e is the set of received samples. For a transfer sub-matrix AS corresponding to a number S of rows of blocks of the transfer matrix A, a set of equalising filters are determined for successively estimating all the symbols transmitted by the CDMA codes on the basis of a particular number of received samples
Claims5
A method of conjoint detection of a set of K simultaneously active CDMA codes received at Ka antennas of a mobile transceiver, said codes being transmitted via a multipath stationary linear transmission channel with Gaussian additional white noise and satisfying the equation e=A.d+n where A is the transfer matrix of said multipath stationary linear channel, d is the set of symbols of the codes to be transmitted, n is the additional noise vector and e is the set of received samples, in which method an estimate δ of the set d of symbols of the codes is obtained by pseudo-inversion of said transfer matrix of the form δ=(A+.A)−1.A+.e where the symbol+denotes the transposition and complex conjugation operator, in which, for a set of transfer sub-matrices AS corresponding to a number S of rows of blocks of said transfer matrix A, said method determines a set of equalising filters for successively estimating all the symbols transmitted by the CDMA codes from a particular number of received samples eS.
Dependencies are inferred from the claim text.