Method and system for down-converting electromagnetic signals by sampling and integrating over apertures
US6266518A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Aug 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2672
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.