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:
Mar. 31, 2015
Filed:
May. 15, 2013
Horia Vlad Balan, Los Angeles, CA (US);
Konstantinos Psounis, Pacific Palisades, CA (US);
Giuseppe Caire, South Pasadena, CA (US);
Horia Vlad Balan, Los Angeles, CA (US);
Konstantinos Psounis, Pacific Palisades, CA (US);
Giuseppe Caire, South Pasadena, CA (US);
University of Southern California, Los Angeles, CA (US);
Abstract
Time and phase synchronization may enable distributed multiuser multiple-input multiple-output (MIMO) architectures and techniques, such as supported by the IEEE 802.11n standard, where several access points are connected to a central server and operate as a large distributed multi-antenna access point. The phase of all access points can be locked using a common reference (e.g., a synchronization tone) broadcasted over the air in conjunction with a predictive filter (e.g., a Kalman filter) which closely tracks the phase drift for each subcarrier channel.