Patent · US Active

Channel covariance feedback for enhanced FD-MIMO

US11632208B2 · kind B2 · utility

1Cited by

2References

25Claims

0Family size

Assignee

QUALCOMM Incorporated · US

Inventors

Bo Chen · Beijing, CN
Chao WEI · Beijing, CN
Liangming WU · Beijing, CN
Neng Wang · Beijing, CN

Key dates

Filing date	Feb 17, 2017
Grant date	Apr 18, 2023
Priority date	—
Expiry date	Dec 10, 2037

Classification

Technology area (CPC H)Electricity
CPC primaryH04B7/0645
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

Channel covariance feedback is disclosed for enhanced full-dimension multiple input, multiple output (eFD-MIMO) systems. Channel state information (CSI) reference signal (CSI-RS) feedback operations are implemented using spatial covariance feedback of a covariance estimate. After obtaining a set of orthogonal basis vectors, a user equipment (UE) measures the CSI-RS from a base station and determines the spatial covariance matrix from the signal. The UE may then compress the spatial covariance matrix into a lower-dimension covariance estimate matrix using the orthogonal basis vectors. The lower-dimension matrix along with element-wise quantization allows for feedback of spatial covariance for eFD-MIMO systems without excessive feedback overhead.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.