{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:KKTM2252SQEFBQCGK7J4XTRGQI","short_pith_number":"pith:KKTM2252","canonical_record":{"source":{"id":"0908.3815","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.AO","submitted_at":"2009-08-26T13:53:39Z","cross_cats_sorted":[],"title_canon_sha256":"98518778a53178846720a65cbb555ed81d89f6b7a6fdadbf2aba434910a84a93","abstract_canon_sha256":"d6262b63da08004fac549ac3353c2d2d13aff3badbe2cb376f27a49eb0071a8e"},"schema_version":"1.0"},"canonical_sha256":"52a6cd6bba940850c04657d3cbce26821a3a59b62164aab04deb744e07dbaaa5","source":{"kind":"arxiv","id":"0908.3815","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.3815","created_at":"2026-05-18T00:59:11Z"},{"alias_kind":"arxiv_version","alias_value":"0908.3815v1","created_at":"2026-05-18T00:59:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.3815","created_at":"2026-05-18T00:59:11Z"},{"alias_kind":"pith_short_12","alias_value":"KKTM2252SQEF","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"KKTM2252SQEFBQCG","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"KKTM2252","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:KKTM2252SQEFBQCGK7J4XTRGQI","target":"record","payload":{"canonical_record":{"source":{"id":"0908.3815","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.AO","submitted_at":"2009-08-26T13:53:39Z","cross_cats_sorted":[],"title_canon_sha256":"98518778a53178846720a65cbb555ed81d89f6b7a6fdadbf2aba434910a84a93","abstract_canon_sha256":"d6262b63da08004fac549ac3353c2d2d13aff3badbe2cb376f27a49eb0071a8e"},"schema_version":"1.0"},"canonical_sha256":"52a6cd6bba940850c04657d3cbce26821a3a59b62164aab04deb744e07dbaaa5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:59:11.266227Z","signature_b64":"YQKE4RkvaRPF2KSZDrrDMvrGZMMWEhX8lyWQ+6FuiNYJJmngrM5mryB0rDu5IQkMOe7C889HGhF8IaztyM5vAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"52a6cd6bba940850c04657d3cbce26821a3a59b62164aab04deb744e07dbaaa5","last_reissued_at":"2026-05-18T00:59:11.265556Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:59:11.265556Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.3815","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":"2026-05-18T00:59:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"51HmSO5K873rLaAM3Jg0PSbFLUNrVvkAEqAWnCBlBG1Y1rhX5A5m+3wiPOInvVbi3Y5G9Z2XVNWIdu3o6guTAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T16:01:48.518924Z"},"content_sha256":"333e9429bf7d381b369a5e7beb436eee9269e5a7dce6fc608d5675f1dd2430e6","schema_version":"1.0","event_id":"sha256:333e9429bf7d381b369a5e7beb436eee9269e5a7dce6fc608d5675f1dd2430e6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:KKTM2252SQEFBQCGK7J4XTRGQI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Filter-And-Forward Distributed Beamforming in Relay Networks with Frequency Selective Fading","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nlin.AO","authors_text":"Alex B. Gershman, Haihua Chen, Shahram Shahbazpanahi","submitted_at":"2009-08-26T13:53:39Z","abstract_excerpt":"A new approach to distributed cooperative beamforming in relay networks with frequency selective fading is proposed. It is assumed that all the relay nodes are equipped with finite impulse response (FIR) filters and use a filter-and-forward (FF) strategy to compensate for the transmitter-to-relay and relay-to-destination channels.\n  Three relevant half-duplex distributed beamforming problems are considered. The first problem amounts to minimizing the total relay transmitted power subject to the destination quality-of-service (QoS) constraint. In the second and third problems, the destination Q"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.3815","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":"2026-05-18T00:59:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6P0f84faAXmotbqH3dmzZuemZbuw6zYjKys4fxSqo0MOnLf7yhe7kFZK4HteEswdUUCuK9vYTEeoE3OInKSgBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T16:01:48.519270Z"},"content_sha256":"c2fd87959036ac30dae723cce0e3772d269523e2ec402d68f4e8189c4f483408","schema_version":"1.0","event_id":"sha256:c2fd87959036ac30dae723cce0e3772d269523e2ec402d68f4e8189c4f483408"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KKTM2252SQEFBQCGK7J4XTRGQI/bundle.json","state_url":"https://pith.science/pith/KKTM2252SQEFBQCGK7J4XTRGQI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KKTM2252SQEFBQCGK7J4XTRGQI/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":"2026-06-04T16:01:48Z","links":{"resolver":"https://pith.science/pith/KKTM2252SQEFBQCGK7J4XTRGQI","bundle":"https://pith.science/pith/KKTM2252SQEFBQCGK7J4XTRGQI/bundle.json","state":"https://pith.science/pith/KKTM2252SQEFBQCGK7J4XTRGQI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KKTM2252SQEFBQCGK7J4XTRGQI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:KKTM2252SQEFBQCGK7J4XTRGQI","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":"d6262b63da08004fac549ac3353c2d2d13aff3badbe2cb376f27a49eb0071a8e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.AO","submitted_at":"2009-08-26T13:53:39Z","title_canon_sha256":"98518778a53178846720a65cbb555ed81d89f6b7a6fdadbf2aba434910a84a93"},"schema_version":"1.0","source":{"id":"0908.3815","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.3815","created_at":"2026-05-18T00:59:11Z"},{"alias_kind":"arxiv_version","alias_value":"0908.3815v1","created_at":"2026-05-18T00:59:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.3815","created_at":"2026-05-18T00:59:11Z"},{"alias_kind":"pith_short_12","alias_value":"KKTM2252SQEF","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"KKTM2252SQEFBQCG","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"KKTM2252","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:c2fd87959036ac30dae723cce0e3772d269523e2ec402d68f4e8189c4f483408","target":"graph","created_at":"2026-05-18T00:59:11Z","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":"A new approach to distributed cooperative beamforming in relay networks with frequency selective fading is proposed. It is assumed that all the relay nodes are equipped with finite impulse response (FIR) filters and use a filter-and-forward (FF) strategy to compensate for the transmitter-to-relay and relay-to-destination channels.\n  Three relevant half-duplex distributed beamforming problems are considered. The first problem amounts to minimizing the total relay transmitted power subject to the destination quality-of-service (QoS) constraint. In the second and third problems, the destination Q","authors_text":"Alex B. Gershman, Haihua Chen, Shahram Shahbazpanahi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.AO","submitted_at":"2009-08-26T13:53:39Z","title":"Filter-And-Forward Distributed Beamforming in Relay Networks with Frequency Selective Fading"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.3815","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":"sha256:333e9429bf7d381b369a5e7beb436eee9269e5a7dce6fc608d5675f1dd2430e6","target":"record","created_at":"2026-05-18T00:59:11Z","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":"d6262b63da08004fac549ac3353c2d2d13aff3badbe2cb376f27a49eb0071a8e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.AO","submitted_at":"2009-08-26T13:53:39Z","title_canon_sha256":"98518778a53178846720a65cbb555ed81d89f6b7a6fdadbf2aba434910a84a93"},"schema_version":"1.0","source":{"id":"0908.3815","kind":"arxiv","version":1}},"canonical_sha256":"52a6cd6bba940850c04657d3cbce26821a3a59b62164aab04deb744e07dbaaa5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"52a6cd6bba940850c04657d3cbce26821a3a59b62164aab04deb744e07dbaaa5","first_computed_at":"2026-05-18T00:59:11.265556Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:59:11.265556Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YQKE4RkvaRPF2KSZDrrDMvrGZMMWEhX8lyWQ+6FuiNYJJmngrM5mryB0rDu5IQkMOe7C889HGhF8IaztyM5vAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:59:11.266227Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.3815","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:333e9429bf7d381b369a5e7beb436eee9269e5a7dce6fc608d5675f1dd2430e6","sha256:c2fd87959036ac30dae723cce0e3772d269523e2ec402d68f4e8189c4f483408"],"state_sha256":"cb671d424906416c434f7e41e2112b5e93896136bd4040ed3ad750fa50d7feaf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v9SuAMoG3aOZbmEan+YhzJqdes6SFKpYuHaw1T5DbAaw4q77naX8LZZKBPF+GxIUhzbS4TCMAPAMT+s7hNQOAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T16:01:48.521632Z","bundle_sha256":"189ed8a557a30925e0d53b0a907aecff049a1874b733f195acab9e6dd273aa1b"}}