Wireless transmission using an adaptive transmit antenna array
First Claim
1. A method of closed loop wireless communication of signals using an adaptive transmit antenna array of size N, in which a plurality M of copies of signals to be transmitted by said transmit antenna array are produced with delays and weights where the weights are functions of the multi-path transmission channel characteristics (H) from said transmit antenna array to a receive antenna array of a receiver and are combined before transmission by said transmit antenna array, the method comprising:
- setting said weights substantially equal to a vector w, which is a concatenation of vectors w1, w2, . . . wN, where wi=(wi,1, wi,2, . . . wi,M)t represents the coefficients of the FIR filter applied on transmit antenna #i and M is the number of elementary time intervals in the FIR filter delay scheme,calculating w to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix HHH, where H is the matrix of the equivalent channel seen by the symbol data and HH is the Hermitian transform of the matrix H,receiving the multi-path signal components propagated to each receiver element with distinguishable delays according to the propagation path, andcombining by said receiver the received signal components from each receive antenna element with delays and weights (u) that are respective functions of the multi-path transmission channels, wherein said delays and weights applied by said receiver are substantially equal to
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Accused Products
Abstract
Closed loop wireless communication of signals using an adaptive transmit antenna array, in which multiple copies of signals to be transmitted by the transmit antenna array are produced with delays and weights that are functions of the multi-path transmission channel characteristics from the transmit antenna array to a receive antenna array of a receiver and are combined before transmission by the transmit antenna array. The delays and weights of the transmit copies for each transmit antenna element are functions of the respective multi-path transmission channel characteristics from that transmit antenna element to the receive antenna array such that the multi-path signal components propagated to each receiver element are received with distinguishable delays according to the propagation path. The receiver combines the received signal components from each receive antenna element with delays and weights that are respective functions of the multi-path transmission channels.
119 Citations
15 Claims
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1. A method of closed loop wireless communication of signals using an adaptive transmit antenna array of size N, in which a plurality M of copies of signals to be transmitted by said transmit antenna array are produced with delays and weights where the weights are functions of the multi-path transmission channel characteristics (H) from said transmit antenna array to a receive antenna array of a receiver and are combined before transmission by said transmit antenna array, the method comprising:
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setting said weights substantially equal to a vector w, which is a concatenation of vectors w1, w2, . . . wN, where wi=(wi,1, wi,2, . . . wi,M)t represents the coefficients of the FIR filter applied on transmit antenna #i and M is the number of elementary time intervals in the FIR filter delay scheme, calculating w to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix HHH, where H is the matrix of the equivalent channel seen by the symbol data and HH is the Hermitian transform of the matrix H, receiving the multi-path signal components propagated to each receiver element with distinguishable delays according to the propagation path, and combining by said receiver the received signal components from each receive antenna element with delays and weights (u) that are respective functions of the multi-path transmission channels, wherein said delays and weights applied by said receiver are substantially equal to - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmitter for closed loop wireless communication of signals comprising an adaptive transmit antenna array of size N, finite impulse response filter means for producing a plurality M of multi-path copies of the signals to be transmitted by said transmit antenna array with delays and weights that are functions of the multi-path transmission channel characteristics (H) from said transmit antenna array to a receive antenna array and for combining the copied signals before transmission by the transmit antenna array, the transmitter comprising:
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means for setting said weights substantially equal to a vector w, which is a concatenation of vectors w1, w2, . . . wN, where wi=(wi,1, wi,2, . . . , wi,M)t represents the coefficients of the FIR filter applied on transmit antenna #i and M is the number of elementary time intervals in the FIR filter delay scheme, means for calculating w to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix HHH, where H is the matrix of the equivalent channel seen by the symbol data and HH is the Hermitian transform of the matrix H, and means for propagating the multi-path signal components to each receiver element which are received with distinguishable delays according to the propagation path, and that the transmitted signals are suitable for reception by a receiver that 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, wherein said delays and weights applied by said receiver are substantially equal to - View Dependent Claims (10, 11)
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12. A receiver comprising a receive antenna array having at least one receive antenna for reception by closed loop wireless communication of signals from a transmitter comprising an adaptive transmit antenna array of size N, in which a plurality M of copies of signals to be transmitted by said transmit antenna array are produced with delays and weights where the weights are functions of the multi-path transmission channel characteristics (H) from said transmit antenna array to a receive antenna array of a receiver and are combined before transmission by said transmit antenna array, said receiver comprises:
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receiving means for receiving the multi-path signal components having weights substantially equal to a vector w, which is a concatenation of vectors w1, w2, . . . wN, where wi=(wi,1, wi,2, . . . , wi,M)t represents the coefficients of the FIR filter applied on transmit antenna #i and M is the number of elementary time intervals in the FIR filter delay scheme, and with w calculated to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix HHH, where H is the matrix of the equivalent channel seen by the symbol data and HH is the Hermitian transform of the matrix H, said multi-path signal components propagated to each receiver element are received with distinguishable delays according to the propagation path, and combining means for combining the received signal components from each receive antenna element with delays and weights (u) that are respective functions of the multi-path transmission channels, wherein said delays and weights applied by said receiver are substantially equal to - View Dependent Claims (13, 14, 15)
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Specification