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In Orthogonal Time Frequency Space (OTFS) modulation, information symbols areembedded in the delay-Doppler (DD) domain instead of the time-frequency (TF)domain. n order to ensure compatibility with existing OFDM systems (e.g. 4GLTE), most prior work on OTFS receivers consider a two-step conversion, wherethe received time-domain (TD) signal is firstly converted to a time-frequency(TF) signal (using an OFDM demodulator) followed by post-processing of this TFsignal into a DD domain signal. In this paper, we show that the spectralefficiency (SE) performance of a two-step conversion based receiver degrades invery high mobility scenarios where the Doppler shift is a significant fractionof the communication bandwidth (e.g., control and non-payload communication(CNPC) in Unmanned Aircraft Systems (UAS)). We therefore consider an alternateconversion, where the received TD signal is directly converted to the DDdomain. The resulting received DD domain signal is shown to be not the same asthat obtained in the two-step conversion considered in prior works. Thealternate conversion does not require an OFDM demodulator and is shown to havelower complexity than the two-step conversion. Analysis and simulations revealthat even in very high mobility scenarios, the SE achieved with the alternateconversion is invariant of Doppler shift and is significantly higher than theSE achieved with two-step conversion (which degrades with increasing Dopplershift).

Time-Domain to Delay-Doppler Domain Conversion of OTFS Signals in Very High Mobility Scenarios