Selection of user-specific transmission parameters for optimization of transmit performance in wireless communications using a common pilot channel
First Claim
1. A method comprising:
- receiving signals from a remote radio;
deriving estimates of receive channels corresponding to the received signals using the received signals;
deriving a model of an expected transmit channel to the remote radio based on the receive channel estimates;
deriving a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel; and
transmitting to the remote radio by applying the derived set of transmit parameters to the transmit antenna array,wherein the estimated transmit signal quality comprises an expected difference in phase at the remote radio between a signal transmitted using candidate transmit weights and a pilot signal transmitted from the antenna array using other transmit weights.
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Accused Products
Abstract
A method and apparatus are provided that optimizes a transmitted user-specific signal. In one embodiment, the invention includes receiving signals from a remote radio, deriving estimates of receive channels corresponding to the received signals using the received signals, deriving a model of an expected transmit channel to the remote radio based on the receive channel estimates, deriving a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel, and transmitting to the remote radio by applying the derived set of transmit parameters to the transmit antenna array.
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Citations
37 Claims
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1. A method comprising:
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receiving signals from a remote radio; deriving estimates of receive channels corresponding to the received signals using the received signals; deriving a model of an expected transmit channel to the remote radio based on the receive channel estimates; deriving a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel; and transmitting to the remote radio by applying the derived set of transmit parameters to the transmit antenna array, wherein the estimated transmit signal quality comprises an expected difference in phase at the remote radio between a signal transmitted using candidate transmit weights and a pilot signal transmitted from the antenna array using other transmit weights. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A computer readable medium having stored thereon data representing instructions which, when executed by a machine, cause the machine to perform operations comprising:
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receiving signals from a remote radio; deriving estimates of receive channels corresponding to received signals using the received signals, the received signal having been received from a remote radio; deriving a model of an expected transmit channel to the remote radio based on the receive channel estimates; and deriving a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel, wherein the estimated transmit signal quality comprises an expected difference in phase at the remote radio between a signal transmitted using candidate transmit weights and a pilot signal transmitted from the antenna array using other transmit weights. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus comprising;
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a receiver to receive signals from a remote radio; a processor to derive estimates of receive channels corresponding to the received signals using the received signals, to derive a model of an expected transmit channel to the remote radio based on the receive channel estimates, derive a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel; and a transmitter to transmit to the remote radio by applying the derived set of transmit parameters to the transmit antenna array, wherein the estimated transmit signal quality comprises an expected difference in phase at the remote radio between a signal transmitted using candidate transmit weights and a pilot signal transmitted from the antenna array using other transmit weights. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification