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PAPR Reduction in OFDM System with π/4-QPSK Mapper Using Improved PTS Technique

Moftah Ali, Raveendra K. Rao, and Vijay Parsa
Innovation Centre for Information Engineering (ICIE), Faculty of Engineering, Dept. of Electrical and Computer Engineering, University of Western Ontario London, Ontario, N6A 5B9, Canada

Abstract—An Orthogonal Frequency Division Multiplexing (OFDM) system with π/4-QPSK (Quadrature Phase Shift Keying) mapper is considered. Partial Transmit Sequence (PTS) technique with an improved partitioning technique is proposed for PAPR reduction. Even though in PTS, the pseudo-random partitioning method yields the best PAPR reduction compared to adjacent and interleaved partitioning methods, there is a lack of structure in partitioning and hence increases system complexity both in the transmitter and the receiver. The proposed scheme offers a systematic and simple construction of adjacently partitioned sub-blocks using the Magic squares to pseudo-randomize them. Numerical results show that the proposed method outperforms both the adjacent and the interleaved partitioning methods and has nearly the same performance as that of pseudo-random partitioning method. 

Index Terms—Orthogonal Frequency Division Multiplexing (OFDM), Peak to Average Power Ratio (PAPR), Partial Transmit Sequence (PTS), Partitioning, Adjacent, Interleaved, Pseudo-random.

Cite: Moftah Ali, Raveendra K. Rao, and Vijay Parsa, "PAPR Reduction in OFDM System with π/4-QPSK Mapper Using Improved PTS Technique," Journal of Communications, vol. 13, no. 4, pp. 155-161, 2018. Doi: 10.12720/jcm.13.4.155-161.