OTFS vs OFDM Waveforms Switching Use based on Mobile Speed Estimation: OTFS vs OFDM Waveforms Switching Use

The upcoming communication systems most provide high data transmission rates. At the same time, they have to guarantee an ultra-low power consumption and low latency. Besides, Orthogonal frequency division multiplexing (OFDM), widely used in 4G and 5G systems, faces significant challenges in high mobility scenarios. Such illness come from channel’s spreads named delay and Doppler. Consequently, those cons affect various applications such as vehicular communications and railway networks. To overcome such cons, it was suggested a noval processing modulation named orthogonal time frequency space (OTFS). This solution goes perfectly with high mobility situation. Nevertheless, while OTFS offers similar performance to OFDM in low mobility scenarios, it introduces considerable complexity in equipment design for high mobility scenarios. Given these factors, a promising approach could be the coexistence of OFDM and OTFS technologies, leveraging their respective strengths in 4G and planned 6G systems. This paper proposes an implementation of an hybrid system. This offers to adopt an alternative strategy, offering to choose an available waveform as function of user speed’s estimation. This strategy will permit to any base station to effectively retain the waveform having a few complexity. This is done with respect to a threshold fixed speed. This hybrid system offers a promising solution to elevate the capabilities of wireless communication systems in high mobility scenarios. The obtained results confirm the viability of this proposed technique.