Spreadtrum · 10.8.3

Spreadtrum/UNISOC proposes CP-OFDM as the DL sensing waveform basis and both CP-OFDM and DFT-s-OFDM as UL sensing waveform bases, consistent with 5G NR communication waveform agreements. They propose studying OFDM-based waveform enhancements specifically targeting sensing coverage performance, including extended CP length, extended OFDM symbol duration, and larger/smaller SCS configurations, explicitly noting the inherent trade-off between SCS, range resolution, and velocity resolution. They propose studying the necessity and feasibility of pulse waveforms as an alternative for coverage enhancement, recommending OFDM-compatible generation methods to minimize specification impact, while arguing pulse waveforms are more naturally suited to monostatic sensing due to relaxed self-interference cancellation requirements. They recommend a structured waveform characterization template for comparative analysis and specify ambiguity function, PAPR, and OOBE/ACLR as key sensing performance metrics for evaluation, with contributions of waveform structure and sequence design to be separately analyzed.