Abstract High peak-to-average power ratio (PAPR) is a concern in orthogonal frequency division multiplexing (OFDM) systems. Hadamard based selected mapping (HSLM) which uses Hadamard code as the phase sequence in selected mapping (SLM) is an attractive technique to reduce PAPR. But it requires sending side information (SI) to the receiver for each data block, and this results in a reduction in bandwidth efficiency. In this paper, we proposed a modified PAPR reduction method called semi-Hadamard based selected mapping (semi-HSLM) to decouple the phase information matrix into a phase rotation matrix for PAPR reduction and a SI matrix for side information hiding. We proposed a semi-hadamard matrix generation method to generate the phase rotation matrix, and designed a cyclic shift matrix as the SI matrix. Compared with the traditional HSLM, the semi-HSLM saves half of the phase storage and achieves good PAPR reduction performance.

About author: Ning Li, is a Professor in School of Electronics Engineering in BUPT. She takes on National High Technology Research and Development Program of China, National Science and Technology Pillar Program during the Twelfth Five-year Plan Period, Major Program of National Natural Science Foundation of China in recent five years. Her research interests include satellite mobile communication, network information security, IoT. Email: lnmmdsy@sina.com Mingjin Li, obtained the B.S. degree in School of Electronic Engineering from Beijing University of Posts and Telecommunications, China, in 2017. From 2017 to now, he has been pursuing the M.S. degree in School of Electronic Engineering, BUPT, China. His research interests include satellite mobile communication. Zhongliang Deng, received the Ph.D. degree from Tsinghua University, China, in 1994. He is a Professor in BUPT and he has been devoted himself to navigation and location services scientific research and engineering practice for a long period. He is the domestic well-known expert in the field of indoor wireless navigation. His research focuses on image transmission, signal analysis, location and navigation.

Ning Li,Mingjin Li,Zhongliang Deng. A Modified Hadamard Based SLM without Side Information for PAPR Reduction in OFDM Systems[J]. China Communications, 2019, 16(12): 124-131.

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