Detection of unoccupied frequency band
US8045923B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2007 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Nov 9, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/56
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An unoccupied frequency band (W) is detected in a telecommunications network by obtaining first values relating to a signal received (r(n)) for respective corresponding times, in this frequency band. Next, a compound signal is obtained in the form of vectors (Yn) respectively associated with these first values, each vector having M components resulting respectively from the products of the first value associated with said vector and M second values relating to the signal received respectively for M offset times (ti) shifted with respect to the time corresponding to said first value, M being a greater integer. Next, at least one first and one second energy vector (EL, EH) are determined, each containing M components corresponding respectively to energy values of the compound signal for the M offset times, respectively on a first frequency band and on a second frequency band, which are situated either side of a reference frequency. Finally, a decision is made as to whether said frequency band is unoccupied on the basis of a comparison of a distribution of the energy values of the compound signal over the first frequency band and of a distribution of the energy values of the compound …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.