A Novel PAPR in OTFS Systems Through ISSA-PTS and ISPR Techniques

In modern communication systems, managing the Peak-to-Average Power Ratio (PAPR) remains a critical challenge, particularly in Orthogonal Time-Frequency Space (OTFS) systems. PAPR significantly influences the efficiency and performance of these systems, with high PAPR leading to signal distortion and reduced system reliability. This is especially problematic in high-speed mobility environments, such as high-speed railway systems, where OTFS modulation is favored for its robustness in dispersive channels. However, the high PAPR in OTFS systems can compromise the performance of power amplifiers, increasing signal distortion and Bit Error Rate (BER). This study introduces two novel PAPR reduction techniques: a hybrid approach combining the Improved Salp Swarm Algorithm (ISSA) with Partial Transmit Sequence (PTS) and an innovative Iterative Sub-block Phase Rotation (ISPR) method. The hybrid ISSA-PTS approach optimizes phase rotations to reduce PAPR, while the ISPR technique further enhances PAPR reduction by iteratively rotating sub-block phases without compromising BER. Simulation results demonstrate that both proposed techniques significantly reduce PAPR and improve BER performance, making them promising solutions for enhancing the reliability and efficiency of OTFS systems in high-mobility communication environments.