Method and apparatus for implementing clear channel assessment function in multi-band OFDM system
US8111661B2 · kind B2 · utility
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1References
20Claims
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Key dates
| Filing date | Feb 5, 2007 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Dec 23, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/0808
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A clear channel assessment CCA method implemented in a multi-band orthogonal frequency division multiplexing (OFDM) system, the method including: estimating an energy of a received signal in each window at predetermined intervals of two moving-average windows; detecting a peak value according to a difference of energies estimated in relation to the two moving-average windows, and accumulating a number of detected peak values; and reporting a channel status to a medium access control (MAC) according to the number of the accumulated peak values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.