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Novel SLM Scheme with LowComplexity for PAPR Reduction in OFDM System
ChuaYun HSU HsinChieh CHAO
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E91A
No.7
pp.16891696 Publication Date: 2008/07/01 Online ISSN: 17451337
DOI: 10.1093/ietfec/e91a.7.1689 Print ISSN: 09168508 Type of Manuscript: PAPER Category: Digital Signal Processing Keyword: orthogonal frequency division multiplexing (OFDM), peaktoaverage power ratio (PAPR) reduction, selected mapping (SLM),
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 Errata[Uploaded on September 1,2008]
Summary:
Orthogonal frequencydivision multiplexing (OFDM) is an attractive transmission technique for highbitrate communication systems. One major drawback of OFDM is the high peaktoaverage power ratio (PAPR) of the transmitted signal. This study introduces a lowcomplexity selected mapping (SLM) OFDM scheme based on discrete Fourier transform (DFT) constellationshaping. The DFTbased constellationshaping algorithm applied with conventional SLM scheme usually requires a bank of DFTshaping matrices to generate lowcorrelation constellation sequences and a bank of inverse fast Fourier transforms (IFFTs) to generate a set of candidate transmission signals, and this process usually results in high computational complexity. Therefore, a sparse matrix algorithm with lowcomplexity is proposed to replace the IFFT blocks and the DFTshaping blocks in the proposed DFT constellationshaping SLM scheme. By using the proposed sparse matrix, the candidate transmission signal with the lowest PAPR can be achieved with lower complexity than that of the conventional SLM scheme. The complexity analysis of the proposed algorithm shows great an improvement in the reduction of the number of multiplications. Moreover, this new lowcomplexity technique offers a PAPR that is significantly lower than that of the conventional SLM without any loss in terms of energy and spectral efficiency.

