Triggering and transmitting sounding packets for wireless communications
US8295263B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2009 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Oct 13, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W24/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A process for determining when sounding packets are to be triggered and transmitted in a wireless beamforming system is disclosed. In one embodiment, a timer is programmably set to adapt to the operating environment. Whenever the timer elapses, a sounding packet is triggered and the timer resets. In another embodiment, the sounding packet is triggered by comparing measured correlations of channel characteristics against a programmable correlation threshold. If a measured correlation falls below the correlation threshold, this indicates that the channel has undergone a relatively large change. In response, a new sounding packet is triggered to update the beam steering matrix. Otherwise, the previous beam steering matrix is still used. Thereby, sounding packets are expeditiously triggered to keep the beam steering matrix updated with minimal impact to the over-the-air bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.