Method and apparatus to provide low cost transmit beamforming for network devices
First Claim
Patent Images
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 an uplink channel to said remote wireless entity, wherein generating an approximated beamforming matrix includes processing said received signal in a linear filter and a beamforming matrix estimator, wherein the linear filter generates a matrix W that is an inverse of a combined channel matrix HV, wherein H is a channel matrix of a forward channel from the remote wireless entity and V is a first beamforming matrix; and
generating transmit signals for transmission in the uplink channel 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.
14 Citations
28 Claims
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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 an uplink channel to said remote wireless entity, wherein generating an approximated beamforming matrix includes processing said received signal in a linear filter and a beamforming matrix estimator, wherein the linear filter generates a matrix W that is an inverse of a combined channel matrix HV, wherein H is a channel matrix of a forward channel from the remote wireless entity and V is a first beamforming matrix; and
generating transmit signals for transmission in the uplink channel 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 a beamforming matrix estimator, wherein the linear filter generates a matrix W that is an inverse of a combined channel matrix HV by processing said received signal in said linear filter, wherein H is a channel matrix of a forward channel from the remote wireless entity and V is a first beamforming matrix, said response frame including data that was multiplied by the first beamforming matrix in the second wireless entity; and
using said approximated beamforming matrix to transmit a second frame in an uplink channel 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 received signal including data that was multiplied by a first beamforming matrix in a remote wireless entity, said linear filter to output a matrix W during closed loop MIMO operation, wherein the matrix W is an inverse of a combined channel matrix HV that is generated by processing said received signals in said linear filter, wherein H is a channel matrix of a forward channel from the remote wireless entity and V is the first beamforming matrix; and a beamforming matrix estimator to generate an approximated beamforming matrix for an uplink 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 received signal including data that was multiplied by a first beamforming matrix in a remote wireless entity, said linear filter to output a matrix W during closed loop MIMO operation, wherein the matrix W is an inverse of a combined channel matrix HV that is generated by processing said received signals in said linear filter, wherein H is a channel matrix of a forward channel from the remote wireless entity and V is the first beamforming matrix; and a beamforming matrix estimator to generate an approximated beamforming matrix for an uplink MIMO channel using said matrix W. - View Dependent Claims (23, 24, 25)
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26. An article comprising a non-transitory machine readable 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 an uplink 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 a beamforming matrix estimator, wherein the linear filter generates a matrix W that is an inverse of a combined channel matrix HV by processing said received signal in said linear filter, wherein H is a channel matrix of the forward channel from the remote wireless entity and V is the first beamforming matrix; and generate transmit signals for transmission in the uplink channel to said remote wireless entity from multiple antennas using said approximated beamforming matrix. - View Dependent Claims (27, 28)
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Specification