公开(公告)号：US20220247465A1

公开(公告)日：2022-08-04

申请号：US17165368

申请日：2021-02-02

Applicant: Cisco Technology, Inc.

Inventor： John Martin GRAYBEAL ,  Paul Anthony POLAKOS ,  Robert Edward LISTON ,  Wai-Tian TAN ,  Xiaoqing ZHU

IPC: H04B7/06 ,  H04B7/0456 ,  H04L25/02 ,  H04B7/0452

Abstract: Multi-User Multiple Input, Multiple Output (MU-MIMO) data transmissions are provided with a forward-predictive precoding matrix to mitigate the effects of a change in a state of a communication channel. First and second soundings are performed, at first and second times, to a receive antenna over a channel and, responsive to each of the soundings, first and second Channel State Information (CSI) are received. Based on the first and second CSI, a change in a state of the channel over a time period between the first and second time is determined. Based on the change in the state of the channel, a forward-predictive channel state matrix and/or a forward-predictive precoding matrix are determined that reflect a state of the channel at a future time and that are consistent with the determined change in the state over the time period. The forward-predictive precoding matrix is applied to a data transmission.