{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:HEWSM4X2KGFT7PP3QVI4EZLGLN","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":"4b3e6c216fc7915775be0073296ca6efba358de777901eb0b606e6bcb191c0da","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-03T06:45:32Z","title_canon_sha256":"1b5dc48b072ea475640990604a8cc0eec91e46682c01a62d6098fc762b361f11"},"schema_version":"1.0","source":{"id":"1802.00929","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.00929","created_at":"2026-05-18T00:24:27Z"},{"alias_kind":"arxiv_version","alias_value":"1802.00929v1","created_at":"2026-05-18T00:24:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.00929","created_at":"2026-05-18T00:24:27Z"},{"alias_kind":"pith_short_12","alias_value":"HEWSM4X2KGFT","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HEWSM4X2KGFT7PP3","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HEWSM4X2","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:72060ff54b8fca0e7a706c20e60a4c24c871f4931b5dfac8b17335f83bd7cf77","target":"graph","created_at":"2026-05-18T00:24:27Z","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"},"paper":{"abstract_excerpt":"Orthogonal time frequency space (OTFS) modulation is a 2-dimensional (2D) modulation scheme designed in the delay-Doppler domain, unlike traditional modulation schemes which are designed in the time-frequency domain. Through a series of 2D transformations, OTFS converts a doubly-dispersive channel into an almost non-fading channel in the delay-Doppler domain. In this domain, each symbol in a frame experiences an almost constant fade, thus achieving significant performance gains over existing modulation schemes such as OFDM. The sparse delay-Doppler impulse response which reflects the actual ph","authors_text":"A. Chockalingam, K. R. Murali","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-03T06:45:32Z","title":"On OTFS Modulation for High-Doppler Fading Channels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.00929","kind":"arxiv","version":1},"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":"sha256:5b17dfea5b4ece0a98b499b03696e169365f84591c1c0ed3eca944a90dc28baf","target":"record","created_at":"2026-05-18T00:24:27Z","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":"4b3e6c216fc7915775be0073296ca6efba358de777901eb0b606e6bcb191c0da","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-02-03T06:45:32Z","title_canon_sha256":"1b5dc48b072ea475640990604a8cc0eec91e46682c01a62d6098fc762b361f11"},"schema_version":"1.0","source":{"id":"1802.00929","kind":"arxiv","version":1}},"canonical_sha256":"392d2672fa518b3fbdfb8551c265665b68173c94c4f7658ce8495042c4c8c500","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"392d2672fa518b3fbdfb8551c265665b68173c94c4f7658ce8495042c4c8c500","first_computed_at":"2026-05-18T00:24:27.845670Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:24:27.845670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0QrK30RJ5ygbBZsef9V3/zvCRpp5CB+7OBHHfzGcvoVcwar6XkWPrx62du56FVebHJZPWg4gIPiw2Wiyzc2XBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:24:27.846260Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.00929","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b17dfea5b4ece0a98b499b03696e169365f84591c1c0ed3eca944a90dc28baf","sha256:72060ff54b8fca0e7a706c20e60a4c24c871f4931b5dfac8b17335f83bd7cf77"],"state_sha256":"47d120717e97009c845ce14240fe2d136ffd38863d1d9c57ce91536684cf01bb"}