Closed loop feedback system for improved down link performance
First Claim
1. A method comprising steps of:
- transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array associated with a first station, the beams transmitting a signature code embedded in each respective space-time coded signal, the signature codes being orthogonal so that a second station can separate and measure a channel impulse response corresponding to each space-time coded signal;
measuring the channel impulse response for each space-time coded signal at the second station, the space-time coded signals including a selected set of least attenuated signals and a remaining set of most attenuated signals; and
sending an indicia of the selected set of least attenuated signals from the second station to the first station.
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Accused Products
Abstract
A method includes receiving at least two space-time coded signals from an antenna system associated with a first station, determining complex channel state information based on the received space-time coded signals, and sending the complex channel state information to the first station. In an alternative embodiment, a method includes transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array, measuring a channel impulse response for each space-time coded signal at a second station, and sending an indicia of a selected set of least attenuated signals from the second station to the first station. The multi-beam antenna array is associated with a first station. The beams transmit a signature code embedded in each respective space-time coded signal, and the signature codes are orthogonal so that the second station can separate and measure the channel impulse response corresponding to each space-time coded signal.
182 Citations
14 Claims
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1. A method comprising steps of:
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transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array associated with a first station, the beams transmitting a signature code embedded in each respective space-time coded signal, the signature codes being orthogonal so that a second station can separate and measure a channel impulse response corresponding to each space-time coded signal;
measuring the channel impulse response for each space-time coded signal at the second station, the space-time coded signals including a selected set of least attenuated signals and a remaining set of most attenuated signals; and
sending an indicia of the selected set of least attenuated signals from the second station to the first station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising a base station and a remote station wherein:
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the base station includes a multi-beam antenna array and a transmitter to transmit at least two space-time coded signals in respective beams of the multi-beam antenna array, the beams transmitting a signature code embedded in each respective space-time coded signal, the signature codes being substantially orthogonal so that the remote station can separate and measure a channel impulse response corresponding to each space-time coded signal;
the remote station includes a receiver and a processor to measure the channel impulse response for each space-time coded signal, the space-time coded signals including a selected set of least attenuated signals and a remaining set of most attenuated signals; and
the remote station further includes a transmitter to send an indicia of the selected set of least attenuated signals from the remote station to the base station. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification