Methods and apparatus for sensing the presence of a transmission signal in a wireless channel
US8027690B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 2008 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Dec 30, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K2203/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for sensing the presence of a transmission signal type within a wireless channel in a wireless communication system, such as those including the use of wireless microphones, are described. Sensing the transmission signal type includes calculating a spectral density estimate of a signal on the wireless channel. A first test value, derived from the calculated spectral density estimate, is compared to a first threshold. A preliminary determination of the presence of the transmission signal type is made if the first test value exceeds the first threshold. Sensing the presence of the signal type after preliminary determination of the presence of the signal type is made by determining that an observed spectral density of a prescribed signal added to the signal on the wireless channel matches a model estimate of the spectral density of the prescribed signal to a sufficient degree.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.