An Efficient Selection Method of a Transmitted OFDM Signal Sequence for Various SLM Schemes

Kee-Hoon KIM
Hyun-Seung JOO
Jong-Seon NO
Dong-Joon SHIN

IEICE TRANSACTIONS on Communications   Vol.E99-B    No.3    pp.703-713
Publication Date: 2016/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015EBP3275
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
inverse fast Fourier transform (IFFT),  low complexity,  orthogonal frequency division multiplexing (OFDM),  peak-to-average power ratio (PAPR),  selected mapping (SLM),  

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Many selected mapping (SLM) schemes have been proposed to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal sequences. In this paper, an efficient selection (ES) method of the OFDM signal sequence with minimum PAPR among many alternative OFDM signal sequences is proposed; it supports various SLM schemes. Utilizing the fact that OFDM signal components can be sequentially generated in many SLM schemes, the generation and PAPR observation of the OFDM signal sequence are processed concurrently. While the u-th alternative OFDM signal components are being generated, by applying the proposed ES method, the generation of that alternative OFDM signal components can be interrupted (or stopped) according to the selection criteria of the best OFDM signal sequence in the considered SLM scheme. Such interruption substantially reduces the average computational complexity of SLM schemes without degradation of PAPR reduction performance, which is confirmed by analytical and numerical results. Note that the proposed method is not an isolated SLM scheme but a subsidiary method which can be easily adopted in many SLM schemes in order to further reduce the computational complexity of considered SLM schemes.