System and method for channel state related feedback in multi-user multiple-input-multiple-output systems
First Claim
1. A method for dimension reduction in Multi-User Multiple-Input-Output (MIMO) wireless communication systems, the method comprising:
- sending by a beamformer to each beamformee, a reduced dimension value of a candidate transmit beamforming matrix as part of a sounding exchange, where said reduced dimension value is smaller than a maximum Nr×
min(nk, Nr), wherein Nr is a number of antennas of said beamformer, and nk is a number of antennas of each said beamformee;
receiving by each said beamformee said reduced dimension value; and
sending by each said beamformee at least one matrix related to a channel sounding to said beamformer, said matrix has a dimension equal to said reduced dimension value,wherein the channel sounding is defined between the beamformer and each said beamformee, wherein said matrix is based on the channel matrix of said channel sounding having a maximum dimension.
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Abstract
System and method for dimension reduction and for channel and interference condition feedback in a Multi-User Multiple-Input-Multiple-Output (MU MIMO) wireless communication system. The method for dimension reduction includes determining a number of virtual antennas, vk, for beamformees pertaining to a multi user (MU) transmission group, reducing the dimension of said matrix by selecting a sub-set of antennas or by Eigen mode selection and sending a reduced dimension candidate transmit beamforming matrix or an effective channel matrix to a beamformer. The method for channel and interference condition feedback Interference condition includes sending to a beamformee metric indicative of the interference level from other streams.
12 Citations
17 Claims
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1. A method for dimension reduction in Multi-User Multiple-Input-Output (MIMO) wireless communication systems, the method comprising:
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sending by a beamformer to each beamformee, a reduced dimension value of a candidate transmit beamforming matrix as part of a sounding exchange, where said reduced dimension value is smaller than a maximum Nr×
min(nk, Nr), wherein Nr is a number of antennas of said beamformer, and nk is a number of antennas of each said beamformee;receiving by each said beamformee said reduced dimension value; and sending by each said beamformee at least one matrix related to a channel sounding to said beamformer, said matrix has a dimension equal to said reduced dimension value, wherein the channel sounding is defined between the beamformer and each said beamformee, wherein said matrix is based on the channel matrix of said channel sounding having a maximum dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for dimension reduction in Multi-User Multiple-Input-Output (MIMO) wireless communication systems, the method comprising:
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sending by a beamformer to each beamformee, a reduced dimension value of an effective channel matrix as part of a sounding exchange, where said reduced dimension value is smaller than a maximum Nr×
nk, where Nr is a number of antennas of said beamformer, and nk is a number of antennas of each said beamformee;receiving by each said beamformee said reduced dimension value; and sending by each said beamformee at least one matrix related to a channel sounding to said beamformer, said matrix has a dimension equal to said reduced dimension value, wherein the channel sounding is defined between the beamformer and each said beamformee, wherein said matrix is based on the channel matrix of said channel sounding having a maximum dimension.
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9. A method for dimension reduction in Multi-User Multiple-Input-Output (MIMO) wireless communication systems, the method comprising:
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sending a matrix related to a channel sounding by each beamformee to a beamformer, said matrix has a dimension that is smaller than a maximum dimension by; obtaining by said each beamformee a reduced dimension vk sent by said beamformer as part of a sounding exchange; obtaining by said each beamformee channel matrix Ĥ
k;performing by said each beamformee, Singular Value Decomposition (SVD) of said channel matrix Ĥ
k;
Ĥ
k=UDV*;composing by said each beamformee, a matrix Ũ
consisting of the vk columns of U corresponding to largest singular values;choosing by said each beamformee, a first stage receive (RX) beamforming matrix, Bk(1), to be a conjugate transpose of a matrix based on Ũ
; andcalculating by said each beamformee, an effective channel matrix by multiplying said channel matrix by said first stage RX beamforming matrix, wherein said calculating is executed by a computer processor. - View Dependent Claims (10)
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11. A method for dimension reduction of a channel matrix sent by each beamformee in Multi-User Multiple-Input-Output (MIMO) wireless communication systems, the method comprising:
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determining a number of virtual antennas, vk, for each said beamformee pertaining to at least one multi user (MU) transmission groups; conveying said number of virtual antennas, vk, from a beamformer to each said beamformee, wherein said number of virtual antennas vk<
nk such that Nr×
vk indicates a size of the reduced dimension channel matrix sent by each said beamformee, where Nr is a number of antennas of said beamformer, and nk is a number of antennas of said beamformee;sounding channels between the beamformer and each said beamformee; calculating reduced dimension channel matrices for said channels; and designing a transmit matrix based on the reduced dimension channel matrices, wherein said calculating is executed by a computer processor. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification