Method and apparatus for calibration and channel state feedback to support transmit beamforming in a MIMO system
US7920533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2007 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Jan 3, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03802
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for calibration and channel state feedback to support transmit beamforming in a multiple-input multiple-output (MIMO) system are disclosed. For radio frequency (RF) calibration, a first station (STA) sends a calibration request to a second STA, and the second STA sends a sounding packet to the first STA. The first STA receives the sounding packet, performs at least one channel measurement and performs calibration based on the channel measurement. For channel state feedback, the first STA sends a channel state feedback request to the second STA. The second STA sends a sounding packet to the first STA. The first STA receives the sounding packet and performs at least one channel measurement with the sounding packet. The first STA then calculates a steering matrix for transmit beamforming based on the channel measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.