Method and apparatus to decouple link adaptation and transmit beamforming in WiFi systems
US9078142B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2013 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Feb 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A link optimizer for optimizing a link on a wireless local area network (WLAN). The link optimizer includes: a sounding distender, a beamform matrix derivation module, and a link dimension attenuator. The sounding distender send a sounding packet exclusively at a maximum number of streams and at a maximum bandwidth supported by the link and receives a MIMO feedback beamforming matrix in response. The beamform matrix derivation module derives from the received MIMO feedback beamforming matrix a set of derived MIMO beamforming matrices having at least a column dimension less than a column dimension in the feedback beamforming matrix. The link dimension attenuator selects at least one of the derived beamforming matrices for transmission of subsequent communication packets, thereby avoiding a requirement for additional channel sounding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.