Full spatial dimension extraction for implicit beamforming
US9059750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2011 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Oct 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/068
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Techniques are provided to compute downlink beamforming weights for beamforming multiple spatial streams to a wireless device when that wireless device does not transmit with a maximum number of spatial streams, and thus when the full dimensional knowledge of the wireless channel to that wireless device needs to be implicitly derived. Uplink signals are received at a plurality of antennas of a first wireless device that are transmitted via a plurality of antennas of a second wireless device. The first wireless device derives values at a plurality of subcarriers of the received signals across the plurality of antennas of the first wireless device. Downlink beamforming weights are computed from values of consecutive subcarriers across the plurality of antennas of the first wireless device. The first wireless device applies the downlink beamforming weights at respective subcarriers to a number of spatial streams to be transmitted to the second wireless device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.