PAPR reduction using clipping function depending on the peak value and the peak width
US9031157B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 12, 2011 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Oct 15, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2623
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
For clipping a signal with respect to a clipping threshold (Amax), a signal portion above the clipping threshold and a peak (Pk) in the signal portion are detected, a clipping function depending on end times (ts, te) of the signal portion, the amplitude of the detected peak and the clipping threshold is derived, and the signal portion is clipped by multiplying it by the clipping function. The first portion can be enlarged up to the lowest boundary points (t1+1, t2−1) on the first ascending portion and the last descending portion of the detected peak. Spectral leakage in the sidebands out to the frequency band of the clipped signal is eliminated by a filtering device. The filtered dipped signal to the input of the amplifier has peaks as close to the saturation threshold of a power amplifier as possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.