Channel adaptation using variable sounding signal rates
US7280804B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2004 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Aug 24, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0226
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Systems, devices and methods for updating link adaptations in multi-carrier modulated signals between an access point (AP) and a wireless local area network (WLAN) station (STA) include (are configured for) periodically transmitting a channel sounding signal from the AP. The STA receives each unsolicited channel sounding signal and evaluates the current channel conditions between the AP and STA. The AP adjusts a rate of transmission of the channel sounding signals in accordance with the channel coherence time so that the channel estimates performed by the STA will be valid within the time varying characteristics of the channel. Depending on the length of the coherence time for network environment, the channel sounding signals may be AP beacons, low overhead signal fragments with no payload, or a combination of both.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.