United States Patent 9,979,446
Xia , et al. May 22, 2018
Method for WiFi beamforming, feedback, and sounding (WiBEAM)
Abstract
Methods for WiFi beamforming, feedback, and sounding (WiBEAM) are described. Codebook based beamforming feedback signaling and sounding mechanisms for use in wireless communications are disclosed. The methods described herein improve the feedback efficiency by using Givens rotation based decompositions and quantizing the resulting angles of the Givens rotation based decompositions using a range from a subset of [0, 2.pi.]. Feedback may also be divided into multiple components to improve feedback efficiency/accuracy. Time domain beamforming reports for taking advantage of channel reciprocity while still taking into account practical radio frequency (RF) channel impairments are also described. Beamforming feedback that prioritized the feedback bits in accordance with the significance of the bits is also disclosed. A preamble structure to enable the use of smoothing methods for improved channel estimation, codebook designs that may be used for codebook based beamforming feedback, and multi-resolution explicit feedback are disclosed as well.
Inventors:
Xia; Pengfei (San Diego, CA), Ghosh; Monisha (Chicago, IL), Lou; Hanqing (Syosset, NY), Olesen; Robert L. (Huntingdon, NY), Oteri; Oghenekome (San Diego, CA)
Applicant:
Name
City
State
Country
Type
InterDigital Patent Holdings, Inc.
Wilmington
DE
US
Assignee:
InterDigital Patent Holdings, Inc. (Wilmington, DE)
Family ID:
1000003307691
Appl. No.:
15/599,651
Filed:
May 19, 2017
Prior Publication Data
Document Identifier
Publication Date
US 20170257153 A1 Sep 7, 2017
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
14040249 Sep 27, 2013 9680538
61707452 Sep 28, 2012
61770879 Feb 28, 2013
61783918 Mar 14, 2013
Current U.S. Class: 1/1
Current CPC Class: H04B 7/0421 (20130101); H04B 7/066 (20130101); H04B 7/0617 (20130101); H04B 7/0628 (20130101); H04L 1/0073 (20130101); H04B 7/0639 (20130101); H04B 7/0641 (20130101); H04L 1/007 (20130101); H04B 7/0634 (20130101)
Current International Class: H04B 7/04 (20170101); H04B 7/06 (20060101); H04L 1/00 (20060101)
PPP
"Intellectuals solve problems; geniuses prevent them." - Albert Einstein
