Cancellation of spurious responses from local oscillator cross-coupling
US9391667B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2013 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | Feb 24, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2621
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Interference cancellation techniques may be implemented in a radio transceiver configured to transmit a radio-frequency transmit signal at a transmit frequency and having two or more local oscillators operative to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies, for simultaneously down-converting two or more corresponding received radio-frequency signals. An example method begins with identifying one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency. A baseband cancellation signal is then generated by weighting and frequency-shifting a baseband representation of the transmit signal, based on the identified self-interfering frequencies. The baseband cancellation signal is then combined with a down-converted received signal, to obtain an interference-reduced baseband signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.