公开(公告)号：WO2020176413A1

公开(公告)日：2020-09-03

申请号：PCT/US2020/019501

申请日：2020-02-24

Applicant: QUALCOMM INCORPORATED

Inventor： MANDULA, Yashwanth ,  VEMULA, Gopala Krishna Murthy ,  CHANDRASEKARAN, Suresh ,  GORE, Ashutosh Deepak ,  VENKATESH, Swaroop ,  JALLOUL, Louay ,  MOHAMMED, Ahmad Abdulrahman ,  LEE, Yen-Feng ,  PAYSARVI HOSEINI, Pedram ,  SU, Chi-Lin ,  KIM, Youhan

IPC: H04B7/0456

Abstract: This disclosure provides methods, devices and systems for obtaining and providing channel feedback. In some implementations, a beamformee provides channel feedback to a beamformer that enables the beamformer to construct and independently precode two or more different sets of spatial streams for transmission to the beamformee. The independent precoding of the different sets of spatial streams ensures that the decodings of the different sets of spatial streams may be decoupled from one another at the beamformee. To provide the channel feedback, the beamformee partitions a channel estimate into two or more sub-estimates prior to performing a channel decomposition. In some implementations, the beamformee determines null-space-based projections of the sub-estimates before performing the channel decomposition. The determination of the null-space-based projections enables the beamformee to perform independent decompositions of the multiple channel sub-estimates to determine multiple respective feedback matrices, which are then assembled to provide the channel feedback to the beamformer. The channel feedback is then reconstructed and disassembled by the beamformer to perform the independent precoding of the different sets of spatial streams.