Polar modulation with IQ zeroing
US8131229B1 · kind B1 · utility
5Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2008 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | Nov 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/364
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for adjustment of spectral signal characteristics in polar modulators are described. A composite signal detection circuit is configured to detect when a signal trajectory of a composite signal provided to the polar modulator passes near the origin of a complex plane associated with the composite signal, and then adjusts the composite signal to pass through the origin. A spectral adjustment circuit is described to adjust AM and FM or PM components of the composite signal to reduce the deviation of an FM component of the composite signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.