Method and apparatus to provide low cost transmit beamforming for network devices
First Claim
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1. A method comprising:
- receiving a signal from a remote wireless entity via a MIMO channel, said signal including data that was multiplied by a first beamforming matrix in said remote wireless entity;
generating an approximated beamforming matrix for use in a return channel to said remote wireless entity, wherein generating an approximated beamforming matrix includes processing said received signal in a linear filter; and
generating transmit signals for transmission to said remote wireless entity from multiple antennas using said approximated beamforming matrix.
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Abstract
Techniques and structures for use in generating an approximated beamforming matrix in a MIMO based system are disclosed. The techniques and structures may be used to allow closed loop MIMO beamforming to be performed within a device that does not include singular value decomposition (SVD) circuitry.
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Citations
29 Claims
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1. A method comprising:
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receiving a signal from a remote wireless entity via a MIMO channel, said signal including data that was multiplied by a first beamforming matrix in said remote wireless entity;
generating an approximated beamforming matrix for use in a return channel to said remote wireless entity, wherein generating an approximated beamforming matrix includes processing said received signal in a linear filter; and
generating transmit signals for transmission to said remote wireless entity from multiple antennas using said approximated beamforming matrix. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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acquiring an exact beamforming matrix at a first wireless entity for a MIMO channel between said first wireless entity and a second wireless entity;
using said exact beamforming matrix to transmit a first frame from said first wireless entity to said second wireless entity through said MIMO channel;
receiving a response frame at said first wireless entity from the second wireless entity;
generating an approximated beamforming matrix for said MIMO channel using said response frame, wherein generating includes processing said response frame in a linear filter; and
using said approximated beamforming matrix to transmit a second frame from said first wireless entity to said second wireless entity. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a linear filter to process signals received from a wireless MIMO channel, said linear filter to output a matrix W during closed loop MIMO operation; and
a beamforming matrix estimator to generate an approximated beamforming matrix for a return MIMO channel using said matrix W. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A system comprising:
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a plurality of dipole antennas;
a linear filter to process signals received from a wireless MIMO channel by said plurality of dipole antennas, said linear filter to output a matrix W during closed loop MIMO operation; and
a beamforming matrix estimator to generate an approximated beamforming matrix for a return MIMO channel using said matrix W. - View Dependent Claims (23, 24, 25)
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26. An article comprising a storage medium having instructions stored thereon that, when executed by a computing platform, operate to:
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receive a signal from a remote wireless entity via a MIMO channel, said signal including data that was multiplied by a first beamforming matrix in said remote wireless entity;
generate an approximated beamforming matrix for use in a return channel to said remote wireless entity, wherein operation to generate an approximated beamforming matrix includes operation to cause said received signal to be processed in a linear filter; and
generate transmit signals for transmission to said remote wireless entity from multiple antennas using said approximated beamforming matrix. - View Dependent Claims (27, 28, 29)
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Specification