公开(公告)号：US11005581B1

公开(公告)日：2021-05-11

申请号：US16784340

申请日：2020-02-07

Applicant: Facebook, Inc.

Inventor： Krishna Srikanth Gomadam ,  Walid Ali-Ahmad ,  Djordje Tujkovic ,  Alireza Tarighat Mehrabani

IPC: H04B17/12 ,  H01Q3/26 ,  H04B7/06 ,  H04B17/10 ,  H04B7/0408

Abstract: Apparatuses, methods, and systems for calibrating of an antenna array that uses low-resolution phase shifters, are disclosed. On method includes generating a codebook of phase-shifter setting selections for each of a plurality of antenna elements of an antenna array including communicating a wireless signal between an external calibration antenna and the antenna array through a beam formed by a reference antenna element of the antenna array and an antenna element of the antenna array being calibrated, measuring a signal power of the communicated wireless signal for each of N settings of a digitally selected phase shifter associated with the antenna element of the antenna array being calibrated, and estimating a virtual signal power of each of M settings of the digitally selected phase shifter based on the signal power measurements of the N settings of the digitally selected phase shifter, wherein M is greater than N.

公开(公告)号：US10715242B1

公开(公告)日：2020-07-14

申请号：US16582858

申请日：2019-09-25

Applicant: Facebook, Inc.

Inventor： Ahmed Gamal Helmy Mohamed ,  Krishna Srikanth Gomadam ,  Sam Padinjaremannil Alex ,  Walid Ali-Ahmad

IPC: H04B17/12 ,  H04B7/0456 ,  H04B7/06 ,  H01Q1/52 ,  H01Q3/38

Abstract: Apparatuses, methods, and systems for grouping antenna elements to enhance an antenna array response resolution, are disclosed. One method includes selecting a plurality of groups of antenna elements from an antenna array, wherein each group includes a plurality of antenna elements of the antenna array, determining an optimal phase setting for a beam directed from each group to a target device, and characterizing each of the groups including adjusting a phase of an electronic signal passing through each of the antenna elements of the group based on the optimal phase setting of the group, adjusting an amplitude ai of the electronic signal the passing through each of the antenna elements of the group to compensate for a loss of antenna array gain of the antenna array due to grouping of the antenna elements, and storing the adjusted phase and adjusted amplitude for each of the antenna element.