{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:QWS6IDK2O3SQSSQD6ENACFTZGC","short_pith_number":"pith:QWS6IDK2","canonical_record":{"source":{"id":"2309.12861","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-09-22T13:35:14Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"38784725e0e78a4f1ec0356bdc8657533a1f73aebfe6a7dd683cd28594ea3568","abstract_canon_sha256":"e905a5d6d6f4eff5a80b54344bcaf782ce29713b08b6dbee24c6e37d9830d0cd"},"schema_version":"1.0"},"canonical_sha256":"85a5e40d5a76e5094a03f11a01167930b4fa7ee98e0516b045dd73a4fd07b3c9","source":{"kind":"arxiv","id":"2309.12861","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.12861","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"arxiv_version","alias_value":"2309.12861v2","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.12861","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"pith_short_12","alias_value":"QWS6IDK2O3SQ","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"pith_short_16","alias_value":"QWS6IDK2O3SQSSQD","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"pith_short_8","alias_value":"QWS6IDK2","created_at":"2026-07-05T07:14:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:QWS6IDK2O3SQSSQD6ENACFTZGC","target":"record","payload":{"canonical_record":{"source":{"id":"2309.12861","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-09-22T13:35:14Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"38784725e0e78a4f1ec0356bdc8657533a1f73aebfe6a7dd683cd28594ea3568","abstract_canon_sha256":"e905a5d6d6f4eff5a80b54344bcaf782ce29713b08b6dbee24c6e37d9830d0cd"},"schema_version":"1.0"},"canonical_sha256":"85a5e40d5a76e5094a03f11a01167930b4fa7ee98e0516b045dd73a4fd07b3c9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:14:17.719385Z","signature_b64":"ORhCj41Oe5v34x9Gt79HNFxn8cpW40yJa9hOOqaehJiuHlViNdBXYxRvfDwd+Ju1Q04M0kb0uy1Kmw3Y2MZWDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"85a5e40d5a76e5094a03f11a01167930b4fa7ee98e0516b045dd73a4fd07b3c9","last_reissued_at":"2026-07-05T07:14:17.718855Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:14:17.718855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2309.12861","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:14:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N6h4e7693CvNa7/SN2ublzHLN4SSPzVK6PWFMDYWooAWZlZhpB5+Qg19KKmEOgbTa+Rbc6BJhd+KvCtlELSlDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T03:36:12.711499Z"},"content_sha256":"1273d151b7874daf155943a877c2b628529401edaec47e1845a0079bfa307cac","schema_version":"1.0","event_id":"sha256:1273d151b7874daf155943a877c2b628529401edaec47e1845a0079bfa307cac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:QWS6IDK2O3SQSSQD6ENACFTZGC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Proof of Concept for OTFS Resilience in Doubly-Selective Channels by GPU-Enabled Real-Time SDR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Ata Sattarzadeh, David Redgate, Neil Bhushan, Onur Dizdar, Stephen Wang, Venkateswara Battula, Yi Xien Yap","submitted_at":"2023-09-22T13:35:14Z","abstract_excerpt":"Orthogonal time frequency space (OTFS) is a modulation technique which is robust against the disruptive effects of doubly-selective channels. In this paper, we perform an experimental study of OTFS by a real-time software defined radio (SDR) setup. Our SDR consists of a Graphical Processing Unit (GPU) for signal processing programmed using Sionna and TensorFlow, and Universal Software Radio Peripheral (USRP) devices for air interface. We implement a low-latency transceiver structure for OTFS and investigate its performance under various Doppler values. By comparing the performance of OTFS with"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.12861","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2309.12861/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:14:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t5Y6jNuYqTz+NhPC1mpeayanx7dGrKMt30VAaND5ESyPKunkEno4SGRhz0bFgSKzDWVsZ9XXyl+LTTJwfa8NCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T03:36:12.711870Z"},"content_sha256":"7db66f9309c4e6838b1daf7c009d2d9d736d89f3186b985bb37fd02d6d97fe7f","schema_version":"1.0","event_id":"sha256:7db66f9309c4e6838b1daf7c009d2d9d736d89f3186b985bb37fd02d6d97fe7f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QWS6IDK2O3SQSSQD6ENACFTZGC/bundle.json","state_url":"https://pith.science/pith/QWS6IDK2O3SQSSQD6ENACFTZGC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QWS6IDK2O3SQSSQD6ENACFTZGC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-09T03:36:12Z","links":{"resolver":"https://pith.science/pith/QWS6IDK2O3SQSSQD6ENACFTZGC","bundle":"https://pith.science/pith/QWS6IDK2O3SQSSQD6ENACFTZGC/bundle.json","state":"https://pith.science/pith/QWS6IDK2O3SQSSQD6ENACFTZGC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QWS6IDK2O3SQSSQD6ENACFTZGC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:QWS6IDK2O3SQSSQD6ENACFTZGC","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"e905a5d6d6f4eff5a80b54344bcaf782ce29713b08b6dbee24c6e37d9830d0cd","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-09-22T13:35:14Z","title_canon_sha256":"38784725e0e78a4f1ec0356bdc8657533a1f73aebfe6a7dd683cd28594ea3568"},"schema_version":"1.0","source":{"id":"2309.12861","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.12861","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"arxiv_version","alias_value":"2309.12861v2","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.12861","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"pith_short_12","alias_value":"QWS6IDK2O3SQ","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"pith_short_16","alias_value":"QWS6IDK2O3SQSSQD","created_at":"2026-07-05T07:14:17Z"},{"alias_kind":"pith_short_8","alias_value":"QWS6IDK2","created_at":"2026-07-05T07:14:17Z"}],"graph_snapshots":[{"event_id":"sha256:7db66f9309c4e6838b1daf7c009d2d9d736d89f3186b985bb37fd02d6d97fe7f","target":"graph","created_at":"2026-07-05T07:14:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2309.12861/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Orthogonal time frequency space (OTFS) is a modulation technique which is robust against the disruptive effects of doubly-selective channels. In this paper, we perform an experimental study of OTFS by a real-time software defined radio (SDR) setup. Our SDR consists of a Graphical Processing Unit (GPU) for signal processing programmed using Sionna and TensorFlow, and Universal Software Radio Peripheral (USRP) devices for air interface. We implement a low-latency transceiver structure for OTFS and investigate its performance under various Doppler values. By comparing the performance of OTFS with","authors_text":"Ata Sattarzadeh, David Redgate, Neil Bhushan, Onur Dizdar, Stephen Wang, Venkateswara Battula, Yi Xien Yap","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-09-22T13:35:14Z","title":"A Proof of Concept for OTFS Resilience in Doubly-Selective Channels by GPU-Enabled Real-Time SDR"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.12861","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1273d151b7874daf155943a877c2b628529401edaec47e1845a0079bfa307cac","target":"record","created_at":"2026-07-05T07:14:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"e905a5d6d6f4eff5a80b54344bcaf782ce29713b08b6dbee24c6e37d9830d0cd","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2023-09-22T13:35:14Z","title_canon_sha256":"38784725e0e78a4f1ec0356bdc8657533a1f73aebfe6a7dd683cd28594ea3568"},"schema_version":"1.0","source":{"id":"2309.12861","kind":"arxiv","version":2}},"canonical_sha256":"85a5e40d5a76e5094a03f11a01167930b4fa7ee98e0516b045dd73a4fd07b3c9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"85a5e40d5a76e5094a03f11a01167930b4fa7ee98e0516b045dd73a4fd07b3c9","first_computed_at":"2026-07-05T07:14:17.718855Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:14:17.718855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ORhCj41Oe5v34x9Gt79HNFxn8cpW40yJa9hOOqaehJiuHlViNdBXYxRvfDwd+Ju1Q04M0kb0uy1Kmw3Y2MZWDw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:14:17.719385Z","signed_message":"canonical_sha256_bytes"},"source_id":"2309.12861","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1273d151b7874daf155943a877c2b628529401edaec47e1845a0079bfa307cac","sha256:7db66f9309c4e6838b1daf7c009d2d9d736d89f3186b985bb37fd02d6d97fe7f"],"state_sha256":"6e75c40999c0cc1a0ed26826d80fd37bfc7ab31b73f1a902fa696356c9bba9b9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qVP5MnZiKGZOdjdb3ZesVonGUASa9qfI9aYlXXDExVqDlZ6PjPAE5wna90OLRBQKpxPnjrAlJDG5DOzonir4BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T03:36:12.713855Z","bundle_sha256":"76d603ca035c649e5cbc890c9da176018c28c6a7498d1dd70a683b7b8d2183a3"}}