Methods and apparatus for reducing the average-to-minimum power ratio of communications signals in communications transmitters
US8306486B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2009 |
| Grant date | Nov 6, 2012 |
| Priority date | — |
| Expiry date | Feb 12, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3411
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for reducing the average-to-minimum power ratio (AMPR) of communications signals in communications transmitters. An AMPR-reducing method includes detecting a sample of a baseband signal having a magnitude less than a predetermined low-magnitude threshold. The magnitude and/or angle of the baseband signal is modified in the temporal vicinity of the detected low-magnitude sample, to form a modified baseband signal having a reduced AMPR. The baseband signal is modified by scaling an insertion pulse by a complex pulse insertion vector and combining the resulting scaled complex insertion pulse with the baseband signal in the temporal vicinity of the detected low-magnitude sample. The pulse insertion angle may be set to any angle within a pulse insertion vector range determined by a vector defining the detected low-magnitude sample and a vector that is orthogonal to the trajectory of the baseband signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.