An \(\alpha \) -Rotated Fourier Transform Used as OTFS Enhancement

Orthogonal-time-frequency-space (OTFS) modulation has received significant attention in wireless communication research due to its exceptional ability to reliable mobile communication. Network links censure high-speed connection. OTFS represents a promising candidate for next-generation wireless communication systems. Operating in the delay-Doppler (DD) domain, it relies on channel invariance. Furthermore, the OTFS system can be implemented on top of an existing Orthogonal Frequency Division Multiplexing (OFDM) system, thereby reducing installation expenses. This advantage is especially noteworthy, given that the Fractional Fourier Transform (FrFT)-based OFDM scheme has demonstrated its superiority over traditional OFDM schemes. We utilize the FrFT-based OFDM system to enhance the performance of the OTFS system. The Weighted Fractional Fourier Transform (WFrFT), as a variant of FT, is a generalized Fourier transform this induces the discrete Fourier transform (DFT) as a special case. In this article, we have chosen to apply FrFT-based OFDM to assess the performance of the OTFS system. Specifically, we have employed the Weighted Fractional Fourier Transform (WFrFT) as a variant of FrFT. We evaluate the usage of an OTFS system that incorporates the inherent WFrFT- based OFDM processing. We obtained various optimal alpha values for SNR values ranging from 0 to 9 dB. Additionally, we have demonstrated that the OTFS system based on WFrFT maintains a lower error rate compared to the conventional OTFS system for SNR ranging from 0 to 9 dB.