A reduced-complexity PTS-based PAPR reduction scheme for OFDM systems

Authors:
Sheng-Ju Ku;Chin-Liang Wang;Chiuan-Hsu Chen
Affiliations:
Institute of Communications Engineering, Tatung University, Taipei, Taiwan, Republic of China and Institute of Communications Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic ...;Department of Electrical Engineering and Institute of Communications Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China;Institute of Communications Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

In this paper, a reduced-complexity partial transmit sequences (PTS) scheme is proposed to resolve the intrinsic high peak-to-average power ratio (PAPR) problem of orthogonal frequency division multiplexing (OFDM) systems. In the proposed PTS scheme, a cost function Qn is generated by summing the power of the time-domain samples at time n in each subblock. Only those samples with Qn greater than or equal to a preset threshold are used for peak power calculation during the process of selecting a candidate signal with the lowest PAPR for transmission. As compared to the conventional PTS scheme, the proposed one achieves almost the same PAPR reduction performance with much lower computational complexity.