PAPR Reduction Precoding for Orthogonal Time Frequency Space Modulation

Orthogonal time frequency space (OTFS) modulation is a promising technique for efficient data transmission in wireless communication systems, particularly in high-mobility scenarios. However, as in other multicarrier schemes, OTFS has one major drawback, high peak-to-average power ratio (PAPR), which can lead to signal distortion and performance degradation. There are various techniques to reduce the PAPR for multicarrier systems. One of these techniques is precoding. In multicarrier systems, precoders such as the Zadoff-Chu transform (ZCT), Walsh-Hadamard transform (WHT), and discrete cosine transform (DCT) were used for PAPR reduction. However, the effect of these precoders on OTFS has not been investigated yet for PAPR reduction. In this work, we propose these precoders to reduce the high PAPR of OTFS modulation. Computer simulation results show that using these transforms as precoder in OTFS leads to significant PAPR reduction with a small error performance compromise.