Reciprocal mixing noise cancellation in the presence of a modulated blocker
US8862087B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2013 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | May 17, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/109
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for reciprocal-mixing noise cancellation may include receiving, from a first mixer, a first signal comprising a wanted signal at a first frequency and a modulated signal at a second frequency. The modulated signal may be a product of a reciprocal-mixing of an unwanted signal with a phase noise. One or more portions of the modulated signal may overlap the wanted signal, adding a reciprocal-mixing noise to the wanted signal. A second signal may be generated by mixing, at a second mixer, the first signal with a third signal, which is at a third frequency related to a blocker offset frequency. A gain may be applied to the second signal to generate an amplified second signal that may be subtracted from the first signal to generate a fourth signal. The fourth signal may be filtered to generate the wanted signal at the first frequency without the reciprocal-mixing noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.