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, in which a plurality of copies of signals to be transmitted by said transmit antenna array are produced with delays and weights (wnj) that 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, characterised in that the delays and weights (wnj) of the transmit copies for each transmit antenna element (n) are functions of the respective multi-path transmission channel characteristics
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, h n , m = M l = L ) 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, and that said receiver 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.
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0 Petitions
Accused Products
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 (wnj) 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 (wnj) 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 (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.
349 Citations
19 Claims
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1. A method of closed loop wireless communication of signals using an adaptive transmit antenna array, in which a plurality of copies of signals to be transmitted by said transmit antenna array are produced with delays and weights (wnj) that 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,
characterised in that the delays and weights (wnj) of the transmit copies for each transmit antenna element (n) are functions of the respective multi-path transmission channel characteristics -
, h n , m = M l = L ) 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, and that said receiver 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 19)
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11. A transmitter for closed loop wireless communication of signals comprising an adaptive transmit antenna array, finite impulse response filter means for producing multi-path copies of the signals to be transmitted by said transmit antenna array with delays and weights (wnj) 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,
characterised in that the delays and weights (wnj) of the transmit copies for each transmit antenna element (n) are functions of the respective multi-path transmission channel characteristics -
, h n , m = M l = L ) 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, 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 - View Dependent Claims (12, 13)
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15. 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,
characterised in that said receiver comprises 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 (H) according to functions suitable for receiving a plurality of multi-path signal components combined at the transmitter and propagated to that receiver element by said transmit antenna array with delays and weights (wnj) for each transmit antenna element (n) that are functions of the respective multi-path transmission channel characteristics -
, h n , m = M l = L ) from that transmit antenna element such that said multi-path signal components are received with distinguishable delays according to the propagation path. - View Dependent Claims (16, 17, 18)
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Specification