Patent ID: 7031671

Claim:
Multi-user detection method with elimination of interference between users, each user transmitting modulated data in the form of symbols on a transmission channel, each transmission channel (k) comprising at least one propagation path (i) and each propagation path arriving at an array of reception antennae (l) according to a direction of arrival (θ i,k ), the method comprising at least one sequence of steps for each transmission channel (k), wherein each sequence comprises: (a) a reception step decomposing each antenna signal into filtered signals (x l,i,k ) issuing from the different paths (i) of the transmission channel (k) and combining the filtered signals by scaling the filtered signals with a first plurality of complex coefficients (b l,i,k, c i,k ) in order to form an estimation (z k ) of the signal transmitted by the user; (b) a step of estimating the contribution ((x l,k )l=1 . . . L), where L is an integer, of the user to the signals received by the array of reception antennae from the estimation of the signal transmitted and a second plurality of complex coefficients (u i,k ,w l,i,k ) obtained from the first plurality of complex coefficients; (c) a step of eliminating interference by subtracting from the antenna signals the contribution estimated at step (b) in order to obtain cleaned antenna signals; the cleaned antenna signals supplied by at least one first sequence being used as antenna signals by at least one second sequence.