Method for making a clear channel assessment in a wireless network
US7280615B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 2003 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Oct 4, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W24/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method is provided for performing a clear channel assessment in a wireless network. The method involves first listening for channel energy on a wireless channel. Whatever channel energy is heard over the wireless channel is demodulated into non-synchronized in-phase and non-synchronized quadrature phase components. Each of the non-synchronized in-phase and non-synchronized quadrature phase components are squared, and then the non-synchronized in-phase component is multiplied by the non-synchronized quadrature phase component to produce an I−Q product. The sum of the squared non-synchronized in-phase component, the inverse of the squared non-synchronized quadrature component, and double the I−Q product is determined as a clear channel assessment input value. A carrier signal detection function is then performed on the clear channel assessment input value to produce a clear channel assessment output value, which is used to determine whether a signal is present in the wireless channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.