Apparatus and method for reducing peak to average power ratio in an orthogonal frequency division multiplexing system
US8300714B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2008 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Aug 31, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0048
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for reducing a Peak to Average Power Ratio (PAPR) using reserved tones in a transmission apparatus of an Orthogonal Frequency Division Multiplexing (OFDM) communication system is provided. The method includes detecting a subcarrier spacing interval and the number of spaced symbols based on a predetermined pilot pattern upon signal reception, and determining positions of shifted reserved tones obtained by shifting positions of reserved tones allocated to a predetermined symbol during the number of the spaced symbols at intervals of the spacing interval; determining an impulse waveform obtained by rotating a phase of a complex value of an impulse stored in a memory, using the determined positions of frequency-domain reserved tones of each symbol; calculating a subtrahend for a PAPR of an output signal using the phase-rotated impulse waveform; and reducing a PAPR of an input signal by performing a gradient algorithm using the phase-rotated impulse waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.