{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:OVNYSVCWWMMBZ6TS4BSC22M6EU","short_pith_number":"pith:OVNYSVCW","canonical_record":{"source":{"id":"1211.5888","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-11-26T08:49:48Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"7a074f13c3f1f8cd58cc5e495446e46ae3d01b3ec95b1176d079425e991dfaef","abstract_canon_sha256":"e6c123334d6ea2cf6bd5702f69f15bcbb009b725483d664f8be31d34bc83712f"},"schema_version":"1.0"},"canonical_sha256":"755b895456b3181cfa72e0642d699e2516b60322f09f9ed74a7e7a2dc33c3ed2","source":{"kind":"arxiv","id":"1211.5888","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.5888","created_at":"2026-05-18T03:40:01Z"},{"alias_kind":"arxiv_version","alias_value":"1211.5888v1","created_at":"2026-05-18T03:40:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.5888","created_at":"2026-05-18T03:40:01Z"},{"alias_kind":"pith_short_12","alias_value":"OVNYSVCWWMMB","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"OVNYSVCWWMMBZ6TS","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"OVNYSVCW","created_at":"2026-05-18T12:27:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:OVNYSVCWWMMBZ6TS4BSC22M6EU","target":"record","payload":{"canonical_record":{"source":{"id":"1211.5888","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-11-26T08:49:48Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"7a074f13c3f1f8cd58cc5e495446e46ae3d01b3ec95b1176d079425e991dfaef","abstract_canon_sha256":"e6c123334d6ea2cf6bd5702f69f15bcbb009b725483d664f8be31d34bc83712f"},"schema_version":"1.0"},"canonical_sha256":"755b895456b3181cfa72e0642d699e2516b60322f09f9ed74a7e7a2dc33c3ed2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:40:01.702646Z","signature_b64":"sDUBnF/MYL5iZAnp8v+NLFgsrJXssoCRHpVLm7Y9360xoG8LnzDYsI2x3iNOH/aIi6A8gHYe/It2KM79ZKmyDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"755b895456b3181cfa72e0642d699e2516b60322f09f9ed74a7e7a2dc33c3ed2","last_reissued_at":"2026-05-18T03:40:01.702076Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:40:01.702076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1211.5888","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:40:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P05w95M4IdbiPXMPBPgqbkyCmOcPwSdOAq0VBdURo9R/EMejrHBqeADL/beaH6l12u2UYH/X8SbyfdvA2IbNAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T01:48:53.576137Z"},"content_sha256":"b4da9bbd2802cc47b28d78f6e4d80fadc9520ee8c022a650e2a8b949d00c75a3","schema_version":"1.0","event_id":"sha256:b4da9bbd2802cc47b28d78f6e4d80fadc9520ee8c022a650e2a8b949d00c75a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:OVNYSVCWWMMBZ6TS4BSC22M6EU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"User Scheduling for Coordinated Dual Satellite Systems with Linear Precoding","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Bjorn Ottersten, Dimitrios Christopoulos, Symeon Chatzinotas","submitted_at":"2012-11-26T08:49:48Z","abstract_excerpt":"The constantly increasing demand for interactive broadband satellite communications is driving current research to explore novel system architectures that reuse frequency in a more aggressive manner. To this end, the topic of dual satellite systems, in which satellites share spatial (i.e. same coverage area) and spectral (i.e. full frequency reuse) degrees of freedom is introduced. In each multibeam satellite, multiuser interferences are mitigated by employing zero forcing precoding with realistic per antenna power constraints. However, the two sets of users that the transmitters are separatel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.5888","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T03:40:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I/CZFt5fObAfavTvGqE5jnF3708Nu6Gw8sCLl9F516cfC3n211hts8pMwHALFSMhfxKlebTumi/dgHjwEDmEBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T01:48:53.576788Z"},"content_sha256":"b0f1d75aaef78cf21db3bee11f138ec647b0ab32e63d536a805949e96fe93e04","schema_version":"1.0","event_id":"sha256:b0f1d75aaef78cf21db3bee11f138ec647b0ab32e63d536a805949e96fe93e04"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU/bundle.json","state_url":"https://pith.science/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU/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":"2026-05-31T01:48:53Z","links":{"resolver":"https://pith.science/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU","bundle":"https://pith.science/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU/bundle.json","state":"https://pith.science/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OVNYSVCWWMMBZ6TS4BSC22M6EU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:OVNYSVCWWMMBZ6TS4BSC22M6EU","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":"e6c123334d6ea2cf6bd5702f69f15bcbb009b725483d664f8be31d34bc83712f","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-11-26T08:49:48Z","title_canon_sha256":"7a074f13c3f1f8cd58cc5e495446e46ae3d01b3ec95b1176d079425e991dfaef"},"schema_version":"1.0","source":{"id":"1211.5888","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.5888","created_at":"2026-05-18T03:40:01Z"},{"alias_kind":"arxiv_version","alias_value":"1211.5888v1","created_at":"2026-05-18T03:40:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.5888","created_at":"2026-05-18T03:40:01Z"},{"alias_kind":"pith_short_12","alias_value":"OVNYSVCWWMMB","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"OVNYSVCWWMMBZ6TS","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"OVNYSVCW","created_at":"2026-05-18T12:27:16Z"}],"graph_snapshots":[{"event_id":"sha256:b0f1d75aaef78cf21db3bee11f138ec647b0ab32e63d536a805949e96fe93e04","target":"graph","created_at":"2026-05-18T03:40:01Z","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":"The constantly increasing demand for interactive broadband satellite communications is driving current research to explore novel system architectures that reuse frequency in a more aggressive manner. To this end, the topic of dual satellite systems, in which satellites share spatial (i.e. same coverage area) and spectral (i.e. full frequency reuse) degrees of freedom is introduced. In each multibeam satellite, multiuser interferences are mitigated by employing zero forcing precoding with realistic per antenna power constraints. However, the two sets of users that the transmitters are separatel","authors_text":"Bjorn Ottersten, Dimitrios Christopoulos, Symeon Chatzinotas","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-11-26T08:49:48Z","title":"User Scheduling for Coordinated Dual Satellite Systems with Linear Precoding"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.5888","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:b4da9bbd2802cc47b28d78f6e4d80fadc9520ee8c022a650e2a8b949d00c75a3","target":"record","created_at":"2026-05-18T03:40:01Z","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":"e6c123334d6ea2cf6bd5702f69f15bcbb009b725483d664f8be31d34bc83712f","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-11-26T08:49:48Z","title_canon_sha256":"7a074f13c3f1f8cd58cc5e495446e46ae3d01b3ec95b1176d079425e991dfaef"},"schema_version":"1.0","source":{"id":"1211.5888","kind":"arxiv","version":1}},"canonical_sha256":"755b895456b3181cfa72e0642d699e2516b60322f09f9ed74a7e7a2dc33c3ed2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"755b895456b3181cfa72e0642d699e2516b60322f09f9ed74a7e7a2dc33c3ed2","first_computed_at":"2026-05-18T03:40:01.702076Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:40:01.702076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sDUBnF/MYL5iZAnp8v+NLFgsrJXssoCRHpVLm7Y9360xoG8LnzDYsI2x3iNOH/aIi6A8gHYe/It2KM79ZKmyDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:40:01.702646Z","signed_message":"canonical_sha256_bytes"},"source_id":"1211.5888","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b4da9bbd2802cc47b28d78f6e4d80fadc9520ee8c022a650e2a8b949d00c75a3","sha256:b0f1d75aaef78cf21db3bee11f138ec647b0ab32e63d536a805949e96fe93e04"],"state_sha256":"9cbe217cacb6943d79818d0aaa69dc29516446f7cb81cfffc2a4cf2e2ac6d583"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JDmk3IgQQW7FTwMVjj46EVfReBXibBc+rhgn38pehdw9IzcFKhPqQtI25B/BDRVzg8K0xO6VBiMW8E1VCv99DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T01:48:53.579970Z","bundle_sha256":"51a5dcaa3629b433b4b218173113853cedeb10b0eb586b0470674b3ee0b7eda0"}}