Advances in OTFS Waveform for Integrated Sensing and Communications
A. Correas Serrano (TU Delft - Microwave Sensing, Signals & Systems)
Alexander Yarovoy – Promotor (TU Delft - Microwave Sensing, Signals & Systems)
Nikita Petrov – Copromotor (TU Delft - Microwave Sensing, Signals & Systems)
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Abstract
This dissertation pushes orthogonal time‑frequency space (OTFS) from a communications-centric innovation to a radar‑ready waveform family suitable for future 6G integrated sensing and communications (ISAC). It is driven by the need to retain OTFS’s Doppler resilience while overcoming three main drawbacks: a lack of a fair comparison study with orthogonal frequency‑division multiplexing (OFDM) for radar tasks, (ii) its rigid, fully populated time‑frequency (TF) structure that hinders multiple‑access flexibility, and (iii) its high peak‑to‑average‑power ratio (PAPR), which obstructs high‑power operation, crucial for many sensing applications. The dissertation delivers a coherent toolkit that clarifies the true origin of OTFS sensing gains, provides the waveform with OFDM‑like scheduling freedom via the novel and well-researched NU‑OTFS, and offers an alternative to remove the PAPR bottleneck through CM‑OTFS. Collectively, these contributions support OTFS in becoming a practically deployable candidate for next‑generation ISAC networks that demand dense MIMO operation, fragmented spectral access, and high‑power front‑ends.