System and method for channel state related feedback in multi-user multiple-input-multiple-output systems
First Claim
1. A method for dimension reduction, the method comprising:
- sending at least one matrix related to channel sounding to a beamformer, said matrix has a dimension that is smaller than a maximum dimension, wherein the channel sounding is defined between a beamformer and beamformees, wherein said matrix is based on a channel matrix of said channel sounding, wherein said maximum dimension is the dimension of the channel matrix, and wherein the matrix is calculated effectively on a reduced dimension channel matrix,wherein the beamformer has informed the beamformee of a value of the reduced dimension channel matrix prior to the sending of the reduced dimension channel matrix by the beamformee,wherein said calculating is executed by a computer processor.
1 Assignment
0 Petitions
Accused Products
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 systems are provided herein. 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 the 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.
17 Citations
23 Claims
-
1. A method for dimension reduction, the method comprising:
-
sending at least one matrix related to channel sounding to a beamformer, said matrix has a dimension that is smaller than a maximum dimension, wherein the channel sounding is defined between a beamformer and beamformees, wherein said matrix is based on a channel matrix of said channel sounding, wherein said maximum dimension is the dimension of the channel matrix, and wherein the matrix is calculated effectively on a reduced dimension channel matrix, wherein the beamformer has informed the beamformee of a value of the reduced dimension channel matrix prior to the sending of the reduced dimension channel matrix by the beamformee, wherein said calculating is executed by a computer processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for dimension reduction, the method comprising:
-
determining a number of virtual antennas, vk, for beamformees pertaining to at least one multi user (MU) transmission groups wherein resolvable Long Training Fields (LTFs) are used, the method further comprising; sounding full channels between said beamformer and said beamformees; calculating reduced dimension effective channel matrices for said full channels; and designing a TX beamforming matrix based on the reduced dimension effective channel matrices, wherein said calculating is executed by a computer processor.
-
-
11. A method for dimension reduction, the method comprising:
-
sending a matrix related to channel sounding to a beamformer, said matrix has a dimension that is smaller than a maximum dimension by; obtaining a reduced dimension vk; obtaining channel matrix Ĥ
k;performing SVD of said channel matrix Ĥ
k;
Ĥ
k=UDV*;composing a matrix Ũ
consisting of the vk columns of U corresponding to largest singular values;choosing a first stage RX beamforming matrix, Bk(1), to be a conjugate transpose of a matrix based on Ũ
; andcalculating said 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 (12)
-
-
13. A method for dimension reduction of a channel matrix sent by a beamformee, the method comprising:
-
determining a number of virtual antennas, vk, for beamformees pertaining to at least one multi user (MU) transmission groups; conveying said number of virtual antennas, vk from a beamformer to said beamformees, wherein said number of virtual antennas, vk indicates a size of the reduced dimension channel matrix sent by the beamformee; sounding channels between a beamformer and said beamformees; calculating reduced dimension channel matrices for said channels; and designing a transmit beamforming matrix based on the reduced dimension channel matrices, wherein said calculating is executed by a computer processor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
Specification