PAPR Reduction in OTSM Systems: A Comparative Analysis of SLM Techniques with Novel Phase Matrix Designs

Liang, Hsin-Ying and Lin, Chuan-Bi (2025) PAPR Reduction in OTSM Systems: A Comparative Analysis of SLM Techniques with Novel Phase Matrix Designs. INFOCOMMUNICATIONS JOURNAL, 17 (4). pp. 12-19. ISSN 2061-2079

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Abstract

Orthogonal Time Sequency Multiplexing (OTSM) represents a pivotal advancement in wireless communication technology. Nevertheless, its high Peak-to-Average Power Ratio (PAPR) imposes significant constraints on its practical applications and future development. The definition of PAPR refers to the ratio of the maximum instantaneous power to the average power of a signal, and it is commonly used to assess the performance of high-power amplifiers. When PAPR values are excessively high, they reduce the efficiency of high-power amplifiers and increase the complexity of the transmission system. To mitigate this challenge, this paper explores and evaluates the efficacy of the Selective Mapping (SLM) technique for enhancing PAPR performance in OTSM systems. Leveraging the unique two-dimensional data structure inherent to OTSM, a specialized SLM approach is introduced in this paper. The proposed SLM method incorporates a Phase Generation Mechanism (PGM) that utilizes a pre-constructed perturbation phase matrix. This matrix undergoes cyclic shifts to produce multiple perturbation phase matrices. To assess the effectiveness of the proposed SLM technique, this paper investigates three distinct perturbation phase matrix generation mechanisms: Zadoff-Chu Transform (ZCT) matrices, Discrete Cosine Transform (DCT) matrices, and Randomly Generated Phase (RGP) matrices. Additionally, for evaluating PAPR performance improvement, the Complementary Cumulative Distribution Function (CCDF) is used, a statistical method that estimates the probability of high PAPR occurrences. Simulation results indicate that the RGP-based phase generation mechanism consistently outperforms the other methods in achieving significant PAPR reduction.

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