OTFS Technology for the Internet of Things in the Context of High-Speed Mobility

This paper addresses the Doppler shift challenge inherent to Orthogonal Time-Frequency Space (OTFS) communication techniques in high-speed mobile scenarios of the Internet of Things (IoT). First, the performance of Quadrature Amplitude Modulation (QAM) technology is analyzed, and the Bit Error Rates (BER) of OTFS, Orthogonal Frequency Division Multiplexing (OFDM) under different QAM modulation modes are compared. It is concluded that when the OTFS transmits a large amount of data, the larger the QAM modulation order, the smaller the BER, and the better the transmission effect. Secondly, the BER trends of OTFS with OFDM at different speeds are compared. The results demonstrate that OTFS exhibits superior anti-Doppler performance compared with OFDM at high-speed moving speeds. Finally, the BER performances of the three detection methods, namely, MP, LMMSE, and MRC delay-Doppler, are investigated to analyse the performance of the BER under different QAM modulations. The results demonstrate that the MRC delay-Doppler detection method is more effective in reducing the BER for the DD domain, exhibiting a robust capacity to compensate for the Doppler frequency deviation and facilitate superior signal restoration.