{"ID":2828624,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2512.14637","arxiv_id":"2512.14637","title":"Tunable Gaussian Pulse for Delay-Doppler ISAC","abstract":"Integrated sensing and communication (ISAC) for next-generation networks targets robust operation under high mobility and high Doppler spread, leading to severe inter-carrier interference (ICI) in systems based on orthogonal frequency-division multiplexing (OFDM) waveforms. Delay--Doppler (DD)-domain ISAC offers a more robust foundation under high mobility, but it requires a suitable DD-domain pulse-shaping filter. The prevailing DD pulse designs are either communication-centric or static, which limits adaptation to non-stationary channels and diverse application demands. To address this limitation, this paper introduces the tunable Gaussian pulse (TGP), a DD-native, analytically tunable pulse shape parameterized by its aspect ratio \\( γ\\), chirp rate \\( α_c \\), and phase coupling \\( β_c \\). On the sensing side, we derive closed-form Cramér--Rao lower bounds (CRLBs) that map \\( (γ,α_c,β_c) \\) to fundamental delay and Doppler precision. On the communications side, we show that \\( α_c \\) and \\( β_c \\) reshape off-diagonal covariance, and thus inter-symbol interference (ISI), without changing received power, isolating capacity effects to interference structure rather than power loss. A comprehensive trade-off analysis demonstrates that the TGP spans a flexible operational region from the high capacity of the Sinc pulse to the high precision of the root raised cosine (RRC) pulse. Notably, TGP attains near-RRC sensing precision while retaining over \\( 90\\% \\) of Sinc's maximum capacity, achieving a balanced operating region that is not attainable by conventional static pulse designs.","short_abstract":"Integrated sensing and communication (ISAC) for next-generation networks targets robust operation under high mobility and high Doppler spread, leading to severe inter-carrier interference (ICI) in systems based on orthogonal frequency-division multiplexing (OFDM) waveforms. Delay--Doppler (DD)-domain ISAC offers a more...","url_abs":"https://arxiv.org/abs/2512.14637","url_pdf":"https://arxiv.org/pdf/2512.14637v1","authors":"[\"Bruno Felipe Costa\",\"Anup Mishra\",\"Israel Leyva-Mayorga\",\"Taufik Abrão\",\"Petar Popovski\"]","published":"2025-12-16T17:54:57Z","proceeding":"eess.SP","tasks":"[\"eess.SP\"]","methods":"[]","has_code":false}