Phase modulating system
US6914472B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2003 |
| Grant date | Jul 5, 2005 |
| Priority date | — |
| Expiry date | Aug 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2057
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Phase modulating systems and methods for modulating the phase of a signal are based on a digital control signal used to select one of a plurality of carriers having different phase angles. In order to reduce the number of short delays that have to be applied to the original signal for obtaining the plurality of carriers, it is proposed that delay elements are arranged in a matrix form. Alternatively, phase shifts are realized by digital frequency dividers instead of by delay elements. Further alternatively or in addition, part of the required delay is approximated or realized by an analog phase shifter. In case the phase modulating system is to be employed for modulating signals of different frequencies, the digital control signal is scaled with a factor associated to the respective frequency in order to change the addressing range for selecting a carrier from among the plurality of carriers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.