Polar modulation with extended AM
US7764139B1 · kind B1 · utility
2Cited by
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22Claims
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Key dates
| Filing date | Nov 28, 2008 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Jan 20, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C5/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for adjusting spectral characteristics of a polar modulation signal in a polar modulator are described. A detection circuit is configured to determine when an FM signal component of the modulation signal exceeds a threshold value. The output of the detection circuit is coupled with FM and AM mapping circuits to selectively map the FM signal component and an AM signal component of the modulation signal to mapped signals, thereby reducing FM deviation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.