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Peak-to-Average-Power-Ratio (PAPR) reduction in WiMAX and OFDM/A systems

Seyran Khademi (Institutionen för signaler och system) ; T. Svantesson ; Mats Viberg (Institutionen för signaler och system, Signalbehandling) ; Thomas Eriksson (Institutionen för signaler och system, Kommunikationssystem)
EURASIP Journal on Advances in Signal Processing (1687-6180). p. Article Number: 38. (2011)
[Artikel, refereegranskad vetenskaplig]

A peak to average power ratio (PAPR) reduction method is proposed that exploits the precoding or beamforming mode in WiMAX. The method is applicable to any OFDM/A systems that implements beamforming using dedicated pilots which use the same beamforming antenna weights for both pilots and data. Beamforming performance depends on the relative phase shift between antennas, but is unaffected by a phase shift common to all antennas. PAPR, on the other hand, changes with a common phase shift and this paper exploits that property. An effective optimization technique based on sequential quadratic programming is proposed to compute the common phase shift. The proposed technique has several advantages compared with traditional PAPR reduction techniques in that it does not require any side-information and has no effect on power and bit-error-rate while providing better PAPR reduction performance than most other methods.

Nyckelord: WiMAX, OFDM, PTS, PAPR reduction, phase optimization, sequential, quadratic programing

Denna post skapades 2012-04-10. Senast ändrad 2016-02-01.
CPL Pubid: 156516


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