High-frequency receiver and adjacent interference wave reducing method
US7848726B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 2006 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Dec 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/22
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A high-frequency receiver alleviates an influence of adjacent interference waves in a location where an identical set of broadcast channels can be received with different broadcast waves which are broadcast or relayed in frequency bands different from one another by satellites and ground repeater(s). The I and Q signals are passed to a pair of variable LPFs. A demodulation unit is provided for each of said different broadcast waves to demodulate the I and Q signals derived from the broadcast wave into a demodulated signal. One of the demodulated signals which has a better reception quality is selected for output. Based on a reception level and a noise evaluation information (e.g., the bit error rate) for a selected demodulated signal, a controller controls the bandwidths of the variable LPFs so as to optimize the reception level and the noise evaluation information for the selected demodulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.