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:
Jul. 06, 2021
Filed:
Apr. 10, 2020
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Jayesh H. Kotecha, Austin, TX (US);
Kaibin Huang, Seoul, KR;
Assignee:
Apple Inc., Cupertino, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H04B 7/06 (2006.01); H04B 7/0456 (2017.01); H04B 7/0426 (2017.01); H04L 1/06 (2006.01); H04B 7/0417 (2017.01); H04W 52/08 (2009.01); H04L 1/00 (2006.01);
U.S. Cl.
CPC ...
H04B 7/0478 (2013.01); H04B 7/043 (2013.01); H04B 7/0417 (2013.01); H04B 7/0447 (2013.01); H04B 7/0632 (2013.01); H04B 7/0634 (2013.01); H04B 7/0639 (2013.01); H04L 1/0693 (2013.01); H04W 52/08 (2013.01); H04L 1/0003 (2013.01); H04L 1/0009 (2013.01);
Abstract
In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.