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Patent Agency Ranking
公开(公告)号：DE60214340D1
公开(公告)日：2006-10-12
申请号：DE60214340
申请日：2002-04-30
Applicant: MOTOROLA INC
Inventor： BULJORE SOODESH , VIALLE SANDRINE , WHINNETT NICHOLAS WILLIAM
Abstract: A method of closed-loop multi-stream wireless communication between a transmitter (1) comprising a transmit antenna array of N transmit antenna elements and a receiver (3) comprising a receive antenna array (4) of M receive antenna elements, wherein a plurality of distinct data streams (x1, x2) are transmitted from the transmit antenna array to the receive antenna array and the data streams are weighted by respective complex weighting matrices before being applied to the transmit antenna array. The distinct data streams are separated and estimated at the receiver. The distinct data streams (x1, x2) are applied to respective sub-groups (6, 7) of the transmit antenna elements at least one of which comprises a plurality of the transmit antenna elements, each of the sub-groups comprising at least Nd transmit antenna elements, where M is greater than or equal to (N/Nd). The complex weighting matrices (v1 to vn) are functions of the respective transmission channels (hij) of the data streams (x1, to xG) including the respective sub-groups of transmit antenna elements. Nd is preferably greater than or equal to two. Each of the complex weighting matrices is calculated to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix H H, where H is the matrix of the equivalent channel including the respective sub-groups of transmit antenna elements (6, 7) seen by the corresponding data stream and H is the Hermitian transform of the matrix H. The number of the transmit antenna elements in each of the sub-groups is preferably re-configurable during operation as a function of channel conditions.
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公开(公告)号：DE60214340T2
公开(公告)日：2007-05-16
申请号：DE60214340
申请日：2002-04-30
Applicant: MOTOROLA INC
Inventor： BULJORE SOODESH , VIALLE SANDRINE , WHINNETT NICHOLAS WILLIAM
Abstract: A method of closed-loop multi-stream wireless communication between a transmitter (1) comprising a transmit antenna array of N transmit antenna elements and a receiver (3) comprising a receive antenna array (4) of M receive antenna elements, wherein a plurality of distinct data streams (x1, x2) are transmitted from the transmit antenna array to the receive antenna array and the data streams are weighted by respective complex weighting matrices before being applied to the transmit antenna array. The distinct data streams are separated and estimated at the receiver. The distinct data streams (x1, x2) are applied to respective sub-groups (6, 7) of the transmit antenna elements at least one of which comprises a plurality of the transmit antenna elements, each of the sub-groups comprising at least Nd transmit antenna elements, where M is greater than or equal to (N/Nd). The complex weighting matrices (v1 to vn) are functions of the respective transmission channels (hij) of the data streams (x1, to xG) including the respective sub-groups of transmit antenna elements. Nd is preferably greater than or equal to two. Each of the complex weighting matrices is calculated to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix H H, where H is the matrix of the equivalent channel including the respective sub-groups of transmit antenna elements (6, 7) seen by the corresponding data stream and H is the Hermitian transform of the matrix H. The number of the transmit antenna elements in each of the sub-groups is preferably re-configurable during operation as a function of channel conditions.
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公开(公告)号：AT338388T
公开(公告)日：2006-09-15
申请号：AT02291092
申请日：2002-04-30
Applicant: MOTOROLA INC
Inventor： BULJORE SOODESH , VIALLE SANDRINE , WHINNETT NICHOLAS WILLIAM
Abstract: A method of closed-loop multi-stream wireless communication between a transmitter (1) comprising a transmit antenna array of N transmit antenna elements and a receiver (3) comprising a receive antenna array (4) of M receive antenna elements, wherein a plurality of distinct data streams (x1, x2) are transmitted from the transmit antenna array to the receive antenna array and the data streams are weighted by respective complex weighting matrices before being applied to the transmit antenna array. The distinct data streams are separated and estimated at the receiver. The distinct data streams (x1, x2) are applied to respective sub-groups (6, 7) of the transmit antenna elements at least one of which comprises a plurality of the transmit antenna elements, each of the sub-groups comprising at least Nd transmit antenna elements, where M is greater than or equal to (N/Nd). The complex weighting matrices (v1 to vn) are functions of the respective transmission channels (hij) of the data streams (x1, to xG) including the respective sub-groups of transmit antenna elements. Nd is preferably greater than or equal to two. Each of the complex weighting matrices is calculated to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix H H, where H is the matrix of the equivalent channel including the respective sub-groups of transmit antenna elements (6, 7) seen by the corresponding data stream and H is the Hermitian transform of the matrix H. The number of the transmit antenna elements in each of the sub-groups is preferably re-configurable during operation as a function of channel conditions.
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公开(公告)号：AU2003229711A1
公开(公告)日：2003-11-17
申请号：AU2003229711
申请日：2003-04-18
Applicant: MOTOROLA INC
Inventor： BULJORE SOODESH , VIALLE SANDRINE , WHINNETT NICHOLAS
Abstract: A method of closed-loop multi-stream wireless communication between a transmitter (1) comprising a transmit antenna array of N transmit antenna elements and a receiver (3) comprising a receive antenna array (4) of M receive antenna elements, wherein a plurality of distinct data streams (x1, x2) are transmitted from the transmit antenna array to the receive antenna array and the data streams are weighted by respective complex weighting matrices before being applied to the transmit antenna array. The distinct data streams are separated and estimated at the receiver. The distinct data streams (x1, x2) are applied to respective sub-groups (6, 7) of the transmit antenna elements at least one of which comprises a plurality of the transmit antenna elements, each of the sub-groups comprising at least Nd transmit antenna elements, where M is greater than or equal to (N/Nd). The complex weighting matrices (v1 to vn) are functions of the respective transmission channels (hij) of the data streams (x1, to xG) including the respective sub-groups of transmit antenna elements. Nd is preferably greater than or equal to two. Each of the complex weighting matrices is calculated to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix H H, where H is the matrix of the equivalent channel including the respective sub-groups of transmit antenna elements (6, 7) seen by the corresponding data stream and H is the Hermitian transform of the matrix H. The number of the transmit antenna elements in each of the sub-groups is preferably re-configurable during operation as a function of channel conditions.
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公开(公告)号：AU2003227664A1
公开(公告)日：2003-11-17
申请号：AU2003227664
申请日：2003-04-18
Applicant: MOTOROLA INC
Inventor： BULJORE SOODESH , VIALLE SANDRINE , WHINNETT NICHOLAS
Abstract: Closed loop wireless communication of signals using an adaptive transmit antenna array (3), in which a plurality of copies of signals to be transmitted by the transmit antenna array (3) are produced with delays and weights (wj_n) that are functions of the multi-path transmission channel characteristics (H) from the transmit antenna array (3) to a receive antenna array (4) of a receiver (2) and are combined before transmission by the transmit antenna array. The delays and weights (w _n) of the transmit copies for each transmit antenna element are functions of the respective multi-path transmission channel characteristics (hl=1_n,m=1,...,hl=L_n,m=M) from that transmit antenna element to the receive antenna array (4) ssuch that the multi-path signal components propagated to each receiver element are received with distinguishable delays according to the propagation path. The receiver (2) combines the received signal components from each receive antenna element with delays and weights (u) that are respective functions of the multi-path transmission channels. Preferably, the receiver comprises a multi-finger RAKE receiver (6) that copies the received signals from the receive antenna array with delays and weights (u) that are respective functions of the multi-path transmission channels and combines the copied received signals.
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