{"paper":{"title":"Constellation-Independent Range Estimation in Payload-Based OFDM-ISAC","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A region-specific mismatched filter lets OFDM-ISAC systems estimate range accurately no matter which data constellation is used for payload.","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Christos Masouros, Dongil Yang, Kaitao Meng, Kawon Han","submitted_at":"2026-05-16T06:19:16Z","abstract_excerpt":"Orthogonal frequency division multiplexing (OFDM) is a key waveform for integrated sensing and communication (ISAC) due to its spectral efficiency and compatibility with modern wireless standards. In multi-target and clutter-rich environments, however, payload-based OFDM-ISAC can suffer from data-dependent sidelobes induced by non-constant-modulus modulation symbols. To overcome these limitations, this paper proposes a region-of-interest mismatched filter (ROI-MMF) that suppresses sidelobes within a prescribed delay region while preserving the mainlobe response. By leveraging the Woodbury iden"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Simulations across various constellations show that the proposed sensing receiver achieves a ranging MSE approaching the Cramér-Rao bound (CRB), which notably confirms that our design preserves the target ranging performance even under the non-constant-modulus constellation.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The delay region of interest can be accurately prescribed in advance so that sidelobe suppression is applied only within that region without distorting the mainlobe response for targets inside it.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"The ROI-MMF enables constellation-independent range estimation in OFDM-ISAC by suppressing sidelobes in a prescribed delay region, 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