The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2018
Filed:
Nov. 09, 2016
Facebook, Inc., Menlo Park, CA (US);
Sungwoo Park, Austin, TX (US);
Ali Yazdan Panah, San Francisco, CA (US);
Facebook, Inc., Menlo Park, CA (US);
Abstract
Apparatuses, methods, and systems for beamforming in antenna systems are disclosed. A method includes determining an unconstrained analog precoding matrix (F), wherein the unconstrained analog precoding matrix (F) is determined based on M dominant eigenvectors of the sum of spatial channel covariance matrices of K users, and wherein K indicates a number of users communicating with a base station. The method further includes determining a constrained analog precoding matrix (F) based on the unconstrained analog precoding matrix (F), determining a compensation matrix (F), digitally multiplying K inputs with a multiple-input multiple-output (MIMO) precoding matrix (F) generating M outputs, digitally multiplying the M outputs with the compensation matrix (F) generating M compensation outputs, generating M analog frequency-up-converted signals based on the M compensation outputs, and analog multiplying the M analog frequency-up-converted signals with the analog precoding matrix (F) generating N output signals for transmission, wherein N is greater than M.