Multi-user detection method
First Claim
1. 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
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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 (xl,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 (bl,i,k,ci,k) in order to form an estimation (zk) of the signal transmitted by the user;
(b) a step of estimating the contribution ((xl,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 (ui,k,wl,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.
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Abstract
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 (θi,k), the method comprising at least one sequence of steps for each user (k), each sequence comprising:
- (a) a reception step (600k,700k,800k,800,900) decomposing each antenna signal into filtered signals (xl,i,k) issuing from the different paths (i) of the said user (k) and combining the said filtered signals by means of a first plurality of coefficients (bl,i,k, ci,k) in order to form an estimation (zk) of the signal transmitted by the user;
- (b) a step of estimating (670k,770k,870k,870,970) the contribution ((xl,k)l=1 . . . L) of the user to the signals received by the different antennae from the said estimation of the signal transmitted and a second plurality of coefficients (ui,k, wl,i,k ) obtained from the said first plurality of coefficients;
- (c) a step of eliminating interference (680k′,780k,880k,880,980) 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.
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Citations
24 Claims
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1. 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
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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 (xl,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 (bl,i,k,ci,k) in order to form an estimation (zk) of the signal transmitted by the user; (b) a step of estimating the contribution ((xl,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 (ui,k,wl,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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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i,k), the method comprising at least one sequence of steps for each transmission channel (k), wherein each sequence comprises;
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24. A multi-user detection system for 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
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i,k), the system comprising;
a receptor configured to decompose each antenna signal into filtered signals (xl,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 coefficients (bl,i,k,ci,k) in order to form an estimation (zk) of the signal transmitted by the user; an estimator configured to estimate the contribution ((xl,k)l=1 . . . L), where L is an integer, of the user to the signals received by the different antennae from the estimation of the signal transmitted and a second plurality of coefficients (ui,k,wl,i,k) obtained from the first plurality of coefficients; said receptor configured to eliminate interference by subtracting from the antenna signals the contribution estimated the estimator in order to obtain cleaned antenna signals; the cleaned antenna signals configured to be supplied by at least one first sequence being used as antenna signals by at least one second sequence.
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i,k), the system comprising;
Specification