Patent ID: 11923975
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 5:
6. A restoring device for restoring channel state information (CSI) from compressed channel state information (CCSI), the CSI representing a channel transfer function H having a spatial dimension (n) and a frequency dimension (f), the restoring device comprising:
a processor configured to:
de-compress the CCSI to obtain a restored transformed channel transfer function (HTR), including one of (1) re-arranging values included in the CCSI in a two-dimensional matrix according to position information τ, k included in the CCSI, (2) performing a de-quantization of an amplitude and/or a phase of the values, and (3) re-normalizing the amplitude of the values,
wherein k represents a spatial component position and τ represents a time tap position of the CCSI; and

re-transform the HTR by performing a time-to-frequency transformation and an inverse spatial transformation on the HTR to obtain a restored channel transfer function (HR),
wherein the HR is a function of one or more rows of N antennas and one or more polarization directions of the antennas,
wherein the inverse spatial transformation is performed as a one-dimensional inverse spatial transformation, and
wherein, for each row and each polarization direction having a number of antennas, the following operations are performed for each time tap position τ:
re-shaping a first linear array comprising all the elements hτ,k of the HTR related to the respective time tap τ into a multi-dimensional array according to a number of rows and polarization directions,
performing the inverse spatial transformation as a multi-dimensional inverse spatial transformation, and
re-arranging the results of the inverse spatial transformation into a second linear array.