Methods and arrangements for peak to average power ratio reduction
US8699609B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 2008 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Mar 11, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2621
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a transmitter and to a receiver and methods thereof wherein the PAPR is reduced by applying a set of different phase rotations to the output of each DFT of the transmitter. A corresponding set of inverse phase rotations are applied to the input of the IDFT of the receiver. The set of phase rotations applied to the subcarriers at the output of the DFT precoder of the transmitter results in a circular time shift of the corresponding time domain at the output of the IDFT modulator. If the phase rotations are properly selected for each DFT precoder, the probability that signal peaks sum in a constructive way at the output of the IDFT modulators is reduced, with a consequent reduction of the PAPR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.