A New PAPR Reduction Methods in OFDM by Combining SLM and PTS

SLM과 PTS 방식의 혼합에 의한 OFDM 신호에서의 PAPR 새로운 감소 기법

  • 기종해 (충북대학교 전기전자컴퓨터공학부) ;
  • 김명제 (충북대학교 전기전자컴퓨터공학부) ;
  • 유정웅 (충북대학교 전기전자컴퓨터공학부) ;
  • 김성수 (충북대학교 전기전자컴퓨터공학부)
  • Published : 2006.01.01

Abstract

This paper proposes a new method that reduces the complexity of the combined system, which consists of the selective mapping(SLM) and the partial transmit sequence(PTS) in the Orthogonal Frequency Division Multiplexing(OFDM). In order to reduce the Peak-to-Average Power Ratio(PAPR), many techniques have been developed such as SLM and PTS. and their combined systems. However the method that simply combines PTS and SLM to improve the effectiveness of a system increases the complexity of calculation. The scheme employed in this research suggests a system that combines PTS and SLM reducing the complexity via the N($N=2^n$)-point inverse fast Fourier transforms(IFFT), which uses the decimation in time domain not only to improve PAPR but also to reduce the amount of calculation. The proposed method reduces the complexity by multiplying a phase sequence and a subblock index to the data sequences in the middle of IFFT, which yields an optimal sequence with minimal PAPR. The superiority of the proposed method is demonstrated by simulation results and analysis.

Keywords

OFDM;SLM;PTS;PAPR