WO WO2026122553A1
Systems and methods are disclosed for supporting uplink communications in wireless networks operating under mobility and delay spread. A base station receives time-domain signals comprising preambles transmitted by multiple user equipments (UEs) within a random-access channel (RACH) slot and transforms the signals into a composite delay–Doppler (DD)-domain representation. The base station detects the preambles by correlating the DD-domain representation with reference pilot waveforms that are mutually unbiased with respect to corresponding UE waveforms, enabling discrimination of overlapping preambles under Doppler and multipath conditions. Uplink resource allocations, such as physical uplink shared-channel (PUSCH) occasions, are determined based on the detected preambles. In some embodiments, a UE generates mutually unbiased pilot and carrier waveforms in the DD domain, transforms them into time-domain signals, and transmits a pilot within a RACH slot to obtain uplink resources. The techniques support robust multi-user access and scheduling in high-mobility environments.
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