Combined open and closed loop beam forming in a multiple array radio communication system
First Claim
1. A method comprising:
- sampling a signal received from a remote radio at elements of an antenna array;
deriving spatial parameters for transmitting a signal to the remote radio from a first transmit antenna array using the samples;
sampling the signal received from the remote radio at elements of at least one additional antenna array;
deriving spatial parameters for transmitting a signal to the remote radio from a second transmit antenna array using the samples of the received signal at the additional antenna array;
receiving feedback signals from the remote radio;
generating diversity parameters for transmitting a signal to the remote radio using the first and second transmit antenna arrays as diversity antennas based on the received feedback; and
transmitting a signal to the remote radio from the first and second transmit antenna arrays using the spatial parameters and the diversity parameters.
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Accused Products
Abstract
A method and apparatus are provided that can combine the benefits of beamforming with transmit diversity. In one embodiment, the invention includes sampling a signal received from a remote radio at elements of an antenna array, deriving spatial parameters for transmitting a signal to the remote radio from an antenna array, sampling the signal received from the remote radio at elements of at least one additional antenna array, and deriving spatial parameters for transmitting a signal to the remote radio from the at least one additional antenna array. The invention further includes generating diversity parameters for transmitting a signal to the remote radio using each antenna array as an element of a diversity array, and transmitting a signal to the remote radio using the spatial parameters and the diversity parameters.
57 Citations
18 Claims
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1. A method comprising:
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sampling a signal received from a remote radio at elements of an antenna array;
deriving spatial parameters for transmitting a signal to the remote radio from a first transmit antenna array using the samples;
sampling the signal received from the remote radio at elements of at least one additional antenna array;
deriving spatial parameters for transmitting a signal to the remote radio from a second transmit antenna array using the samples of the received signal at the additional antenna array;
receiving feedback signals from the remote radio;
generating diversity parameters for transmitting a signal to the remote radio using the first and second transmit antenna arrays as diversity antennas based on the received feedback; and
transmitting a signal to the remote radio from the first and second transmit antenna arrays using the spatial parameters and the diversity parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A machine-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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sampling a signal received from a remote radio at elements of an antenna array;
deriving spatial parameters for transmitting a signal to the remote radio from a first transmit antenna array using the samples;
sampling the signal received from the remote radio at elements of at least one additional antenna array;
deriving spatial parameters for transmitting a signal to the remote radio from a second transmit antenna array using the samples of the received signal at the additional antenna array;
receiving feedback signals from the remote radio;
generating diversity parameters for transmitting a signal to the remote radio using the first and second transmit antenna arrays as diversity antennas based on the received feedback; and
transmitting a signal to the remote radio from the first and second transmit antenna arrays using the spatial parameters and the diversity parameters. - View Dependent Claims (11, 12, 13)
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14. An apparatus comprising:
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a receiver to sample a signal received from a remote radio at elements of an antenna array and at elements of at least one additional antenna array;
a signal processor to derive spatial parameters for transmitting a signal to the remote radio from a first transmit antenna array and from a second transmit antenna array based on the samples and to generate diversity parameters for transmitting the signal to the remote radio using the first and second transmit antenna arrays as diversity antennas by receiving feedback signals from the remote radio and determining diversity parameters based on the received feedback; and
a transmitter to transmit a signal to the remote radio from the first and second transmit antenna arrays using the spatial parameters and the diversity parameters. - View Dependent Claims (15, 16, 17, 18)
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Specification