A delay-Doppler pulse-shaping phase ramp shifts each Zak-OTFS user's signal into its own time-frequency slot, and simulations show multiuser uplink performance matching single-user performance without guard bands.
Zak-OTFS Implementation via Time and Frequency Windowing,
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Zak-OTFS based Multiuser Uplink in Doubly-Spread Channels
A delay-Doppler pulse-shaping phase ramp shifts each Zak-OTFS user's signal into its own time-frequency slot, and simulations show multiuser uplink performance matching single-user performance without guard bands.