公开(公告)号：US20200274592A1

公开(公告)日：2020-08-27

申请号：US16782709

申请日：2020-02-05

Applicant: QUALCOMM Incorporated

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

IPC: H04B7/06 ,  H04B7/0417 ,  H04B7/0456 ,  H04L25/02 ,  H04W80/04 ,  H04L25/03

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.

公开(公告)号：US20180351620A1

公开(公告)日：2018-12-06

申请号：US15629356

申请日：2017-06-21

Applicant: QUALCOMM Incorporated

Inventor： Chi-Lin SU ,  Youhan KIM ,  Ning ZHANG

IPC: H04B7/06 ,  H04B7/0417

CPC classification number: H04B7/0626 ,  H04B7/0695

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for combining channel feedback obtained for multiple soundings and transmitting beamformed communications based on the combined channel feedback. In one aspect, a method includes transmitting, by a first wireless device, a first channel sounding using a first subset of antennas, receiving first channel feedback from a second wireless device based on the first channel sounding, transmitting a second channel sounding using a second subset of the antennas that partially overlaps with the first subset, receiving second channel feedback based on the second channel sounding, and transmitting a beamformed communication to the second wireless device based on the first and the second channel feedback.