Method and apparatus for facilitating multi-user joint transmit-receive beamforming
First Claim
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1. A method of wireless communication comprising:
- receiving channel direction information (CDI) from a plurality of access terminals;
selecting a set of access terminals from the plurality of access terminals based on the received CDI, wherein selecting the set comprises, while a number of access terminals in the set is fewer than a number of transmit antennas;
identifying an access terminal that has a highest channel norm of a subset of unselected access terminals, wherein the CDI of each of the access terminals in the subset has a low correlation with respect to the CDI of access terminals in the set; and
including the identified access terminal in the set;
creating a beamforming vector for each access terminal in the set of access terminals; and
transmitting a signal to each access terminal in the set using the created beamforming vectors.
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Abstract
A method of wireless communication is disclosed that includes receiving detected channel information from a plurality of access terminals; selecting a set of access terminals from the plurality of access terminals based on the received channel information; creating a beamforming vector for each access terminal in the set of selected access terminals; and transmitting a signal using at least one of the created beamforming vectors. An apparatus for performing the method is also disclosed herein.
17 Citations
17 Claims
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1. A method of wireless communication comprising:
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receiving channel direction information (CDI) from a plurality of access terminals; selecting a set of access terminals from the plurality of access terminals based on the received CDI, wherein selecting the set comprises, while a number of access terminals in the set is fewer than a number of transmit antennas; identifying an access terminal that has a highest channel norm of a subset of unselected access terminals, wherein the CDI of each of the access terminals in the subset has a low correlation with respect to the CDI of access terminals in the set; and including the identified access terminal in the set; creating a beamforming vector for each access terminal in the set of access terminals; and transmitting a signal to each access terminal in the set using the created beamforming vectors. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for wireless communication comprising:
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means for receiving channel direction information (CDI) from a plurality of access terminals; means for selecting a set of access terminals from the plurality of access terminals based on the received CDI, wherein the means for selecting is configured, while a number of access terminals in the set is fewer than a number of transmit antennas, to identify an access terminal that has a highest channel norm of a subset of unselected access terminals and to include the identified access terminal in the set, wherein the CDI of each of the access terminals in the subset has a low correlation with respect to the CDI of access terminals in the set; means for creating a beamforming vector for each access terminal in the set of access terminals; and means for transmitting a signal to each access terminal in the set using the created beamforming vectors. - View Dependent Claims (7, 8, 9, 10)
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11. An apparatus for wireless communication, comprising:
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a receiver configured to receive channel direction information (CDI) from a plurality of access terminals; and
,a processing system configured to; select a set of access terminals from the plurality of access terminals based on the received CDI, wherein selecting the set comprises, while a number of access terminals in the set is fewer than a number of transmit antennas; identifying an access terminal that has a highest channel norm of a subset of unselected access terminals, wherein the CDI of each of the access terminals in the subset has a low correlation with respect to the CDI of access terminals in the set; and including the identified access terminal in the set; create a beamforming vector for each access terminal in the set of access terminals; and transmit a signal to each access terminal in the set using the created beamforming vectors. - View Dependent Claims (12, 13, 14, 15)
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16. A computer-program product, comprising:
a machine-readable medium encoded with instructions executable by a processor to cause the processor to; receive channel direction information (CDI) from a plurality of access terminals; select a set of access terminals from the plurality of access terminals based on the received CDI, wherein selecting the set comprises, while a number of access terminals in the set is fewer than a number of transmit antennas; identifying an access terminal that has a highest channel norm of a subset of unselected access terminals, wherein the CDI of each of the access terminals in the subset has a low correlation with respect to the CDI of access terminals in the set; and including the identified access terminal in the set; create a beamforming vector for each access terminal in the set of access terminals; and transmit a signal to each access terminal in the set using the created beamforming vectors.
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17. A base station, comprising:
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a wireless network adapter configured to receive channel direction information (CDI) from a plurality of access terminals; and a processing system configured to; select a set of access terminals from the plurality of access terminals based on the received CDI, wherein selecting the set comprises, while a number of access terminals in the set is fewer than a number of transmit antennas; identifying an access terminal that has a highest channel norm of a subset of unselected access terminals, wherein the CDI of each of the access terminals in the subset has a low correlation with respect to the CDI of access terminals in the set; and including the identified access terminal in the set; create a beamforming vector for each access terminal in the set of selected access terminals; and transmit a signal to each access terminal in the set using the created beamforming vectors.
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Specification