{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:VRGWWXCGQMAEYEBBXM26YY2KZJ","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":"0d4462a99f9dedee0fd4fb5753ae885b0cb1ab3112c0b97af6bdff9981b9692b","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-18T18:55:29Z","title_canon_sha256":"31e9ae7b9a056f301b45ebc2767eaed35d94eba0c8af8d81acec811e5ca90a99"},"schema_version":"1.0","source":{"id":"1712.06583","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.06583","created_at":"2026-05-18T00:27:47Z"},{"alias_kind":"arxiv_version","alias_value":"1712.06583v1","created_at":"2026-05-18T00:27:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.06583","created_at":"2026-05-18T00:27:47Z"},{"alias_kind":"pith_short_12","alias_value":"VRGWWXCGQMAE","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"VRGWWXCGQMAEYEBB","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"VRGWWXCG","created_at":"2026-05-18T12:31:49Z"}],"graph_snapshots":[{"event_id":"sha256:fdd9e65dd94685bce4b883cd7af1df10bcb792e9f564a7138603e594b74389fa","target":"graph","created_at":"2026-05-18T00:27:47Z","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":"High altitude platform (HAP) drones can provide broadband wireless connectivity to ground users in rural areas by establishing line-of-sight (LoS) links and exploiting effective beamforming techniques. However, at high altitudes, acquiring the channel state information (CSI) for HAPs, which is a key component to perform beamforming, is challenging. In this paper, by exploiting an interference alignment (IA) technique, a novel method for achieving the maximum sum-rate in HAP-based communications without CSI is proposed. In particular, to realize IA, a multiple-antenna tethered balloon is used a","authors_text":"Maurizio Magarini, Mohammad Mozaffari, P. G. Sudheesh, P. Muthuchidambaranathan, Walid Saad","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-18T18:55:29Z","title":"Sum-Rate Analysis for High Altitude Platform (HAP) Drones with Tethered Balloon Relay"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.06583","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":"sha256:6849c4edba0267e04e5246c8172ace217e7f631d366ac1f4e1467dbfcfb666c6","target":"record","created_at":"2026-05-18T00:27:47Z","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":"0d4462a99f9dedee0fd4fb5753ae885b0cb1ab3112c0b97af6bdff9981b9692b","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-12-18T18:55:29Z","title_canon_sha256":"31e9ae7b9a056f301b45ebc2767eaed35d94eba0c8af8d81acec811e5ca90a99"},"schema_version":"1.0","source":{"id":"1712.06583","kind":"arxiv","version":1}},"canonical_sha256":"ac4d6b5c4683004c1021bb35ec634aca7baf61172aa5a42183bf58caaec71283","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac4d6b5c4683004c1021bb35ec634aca7baf61172aa5a42183bf58caaec71283","first_computed_at":"2026-05-18T00:27:47.539347Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:27:47.539347Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fe0Ff4CCwnLmlL8q1ECN7sV54C7L9E+R93Gznxc5ngZhe/HHOn4g231QDlmT8gdc0wI0TushCmHTdf6QZts2BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:27:47.539835Z","signed_message":"canonical_sha256_bytes"},"source_id":"1712.06583","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6849c4edba0267e04e5246c8172ace217e7f631d366ac1f4e1467dbfcfb666c6","sha256:fdd9e65dd94685bce4b883cd7af1df10bcb792e9f564a7138603e594b74389fa"],"state_sha256":"a4acab6c00f8352ee4704d5437a5f912b5db0144a81249f7958cbdde18ff2229"}