公开(公告)号：US20190115959A1

公开(公告)日：2019-04-18

申请号：US16211014

申请日：2018-12-05

Applicant: Facebook, Inc.

Inventor： Ahmed Alkhateeb ,  Sam Padinjaremannil Alex ,  Ali YAZDAN ,  Qi Qu

IPC: H04B7/0452 ,  H04W52/42 ,  H04W52/24 ,  H04B7/0456 ,  H04W52/28 ,  H04W52/34

CPC classification number: H04B7/0452 ,  H04B7/0456 ,  H04B7/0465 ,  H04W52/243 ,  H04W52/283 ,  H04W52/346 ,  H04W52/42

Abstract: Apparatuses, methods, and systems zone precoding are disclosed. One method includes determining a transmission zone for each of the plurality of users, wherein the transmission zone includes an angle of direction of a directional beam to each user, and a deviation of the angle of direction. Determining a precoding of transmission signals to each of the plurality of users from the base station, including determining an initial precoding for each of the users based on the transmission zone associated with the user, and constructing the precoding for each user by adjusting the initial precoding for each user based on the transmission zone determined for each of the other users.

公开(公告)号：US20190296806A1

公开(公告)日：2019-09-26

申请号：US16435511

申请日：2019-06-09

Applicant: Facebook, Inc.

Inventor： Ahmed Alkhateeb ,  Sam Padinjaremannil Alex ,  Ali YAZDAN ,  Qi Qu

IPC: H04B7/0452 ,  H04W52/42 ,  H04W52/24 ,  H04B7/0456 ,  H04W52/28 ,  H04W52/34

Abstract: Apparatuses, methods, and systems zone precoding are disclosed. One method includes determining a transmission zone for each of the plurality of users, wherein the transmission zone includes an angle of direction of a directional beam to each user, and a deviation of the angle of direction. Determining a precoding of transmission signals to each of the plurality of users from the base station based on the transmission zone associated with the user, and constructing the precoding for each user by adjusting the initial precoding for each user based on the transmission zone determined for each of the other users.

公开(公告)号：US20190013845A1

公开(公告)日：2019-01-10

申请号：US16110397

申请日：2018-08-23

Applicant: Facebook, Inc.

Inventor： Qi Qu ,  Sam Padinjaremannil Alex ,  Ali YAZDAN ,  Abhishek Tiwari ,  Yan Yan ,  Hongyu Zhou ,  Pratheep Bondalapati

IPC: H04B7/0456 ,  H01Q1/28 ,  H04B7/06 ,  H04B7/08

Abstract: Apparatuses, methods, and systems for MIMO inter-stream interference cancellation are disclosed. One method includes determining a channel matrix between a plurality of transmitting antennas of a transmitter and a plurality of receiving antennas of a receiver, determining a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas, determining differences in the plurality of channel propagation delays, preprocessing, by the transmitter, streams of symbols for each transmitting antenna for transmission based on the differences in the plurality of channel propagation delays and based on the channel matrix, and transmitting, by the transmitter, the preprocessed symbol streams through the plurality of transmitting antennas.