Patent ID: 11876589
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The communication device of claim 1, wherein
the communication device is configured to receive from the transmitter an explicit CSI report configuration comprising a CSI channel-type information, CSI-Ind, indicator for the CSI report, wherein the CSI-Ind indicator is associated with a channel-type configuration,
the channel tensor is a three-dimensional, 3D, channel tensor, or is represented by a 3D channel covariance tensor, a 3D beamformed-channel tensor, or a 3D beamformed channel covariance tensor, as indicated by the CSI-Ind indicator, and
wherein the plurality of dominant principal components of the compressed 3D channel tensor of dimension Nr×Nt×S comprise:
a first set of r1 basis vectors comprised by a matrix ŪR=[uR,1, . . . , uR,r1]∈Nr×r1;
a second set of r2 basis vectors comprised by a matrix ŪT=[uT,1, . . . , uT,r2]∈Nt×r2;
a third set of r3 basis vectors comprised by a matrix ŪS=[uS,1, . . . , uS,r3]∈S×r3; and
r1r2r3associated high-order singular values sijk, sorted such that Σj,k|si,j,k|2≥Σj,k|si+1,j,k|2, Σi,k|si,j,k|2≥Σi,k|si,j+1,k|2, and Σi,j|si,j,k|2≥Σi,j|si,j,k+1|2 for all i, j, k.