{"paper":{"title":"NL-COMM-Sat: Breaking the Direct Device-to-Satellite Communication Barrier via \"Aggressive\" Non-Orthogonal Transmissions and Non-Linear Processing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Aggressive non-orthogonal transmissions from multiple users combined with non-linear processing can double spectral efficiency in direct device-to-satellite links even with a single-antenna receiver.","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Chathura Jayawardena, Konstantinos Nikitopoulos","submitted_at":"2026-04-27T13:22:17Z","abstract_excerpt":"Direct Device-to-Satellite (D2S) communications, which enable direct satellite connectivity with unmodified user equipment (UE), not only expand global coverage but also reshape the evolution of future access networks. However, D2S links face fundamental challenges due to inherently low signal-to-noise ratios (SNRs) and limited spatial multiplexing gains arising from near line-of-sight propagation, both of which severely constrain achievable spectral efficiency. Despite the lack of spatial multiplexing, this work shows that aggressive non-orthogonal transmissions, where multiple users (e.g., f"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Our evaluation shows that NL-COMM-Sat achieves up to a 2x increase in spectral efficiency compared to orthogonal multiple access and NOMA baselines across all considered SNR and Doppler regimes, even with a single-antenna receiver and user speeds of up to 500 km/h.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the proposed computationally efficient non-linear processing schemes can be realized in real-time satellite hardware while maintaining the claimed gains under realistic channel estimation errors and high-mobility Doppler conditions.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"NL-COMM-Sat enables up to 2x higher spectral efficiency in direct device-to-satellite communications by supporting four or more concurrent non-orthogonal users per single-antenna receiver through aggressive transmissions and efficient non-linear processing, even at high Doppler and with channel-est.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Aggressive non-orthogonal transmissions from multiple users combined with non-linear processing can double spectral efficiency in direct device-to-satellite links even with a single-antenna receiver.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"e9e2c45776ec5cbbf0566816aef0afd63ab0602c1391c85d9ae2ee6bddb9fe6e"},"source":{"id":"2604.24453","kind":"arxiv","version":3},"verdict":{"id":"e2a521b6-7564-464a-bba5-94d352fd581d","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-08T01:55:30.194977Z","strongest_claim":"Our evaluation shows that NL-COMM-Sat achieves up to a 2x increase in spectral efficiency compared to orthogonal multiple access and NOMA baselines across all considered SNR and Doppler regimes, even with a single-antenna receiver and user speeds of up to 500 km/h.","one_line_summary":"NL-COMM-Sat enables up to 2x higher spectral efficiency in direct device-to-satellite communications by supporting four or more concurrent non-orthogonal users per single-antenna receiver through aggressive transmissions and efficient non-linear processing, even at high Doppler and with channel-est.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the proposed computationally efficient non-linear processing schemes can be realized in real-time satellite hardware while maintaining the claimed gains under realistic channel estimation errors and high-mobility Doppler conditions.","pith_extraction_headline":"Aggressive non-orthogonal transmissions from multiple users combined with non-linear processing can double spectral efficiency in direct device-to-satellite links even with a single-antenna receiver."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.24453/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-21T06:40:08.787577Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T22:05:04.088049Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"840ccb0d1b62260da2439a456794548375900ef1e745dc101e0f983df960cef7"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}