Method for WiFi beamforming, feedback, and sounding (WiBEAM)
US9680538B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2013 |
| Grant date | Jun 13, 2017 |
| Priority date | — |
| Expiry date | Sep 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0073
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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, 2π]. 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 prioritizes 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.