Satellite interference canceling
US8121550B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2007 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Dec 28, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18517
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A satellite interference canceling system cancels the interference between two or more signals received by a satellite receiver. The signals can be two signals experiencing cross polarization interference or signals that experience interference from other satellite signals. Gain and phase are applied to the received signals and then combined with the other signals to result in cancellation by subtraction. The gain and phase values needed to cancel the interference are derived from measurements of carrier-to-noise ratio (C/N) as an indication of the interference level. The C/N can be measured in the set-top box indoor unit. Coherency restoration is performed in receivers that downconvert the signals before performing interference cancellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.