{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:PWUTQSYV2QAPQNMHI6QHMKGEVO","short_pith_number":"pith:PWUTQSYV","canonical_record":{"source":{"id":"1308.1876","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-08T15:33:47Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"99b37dc00c307390bb1fed96c14811ebf36b88305a9cdb4c8bdccf972a045428","abstract_canon_sha256":"361cf372ca6d63866074d83032af8cdb0897e9e5abfcd8802df5abbc8c8009cd"},"schema_version":"1.0"},"canonical_sha256":"7da9384b15d400f8358747a07628c4aba0af730a79afffaf2500a450138cfdaa","source":{"kind":"arxiv","id":"1308.1876","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.1876","created_at":"2026-05-18T03:16:27Z"},{"alias_kind":"arxiv_version","alias_value":"1308.1876v1","created_at":"2026-05-18T03:16:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.1876","created_at":"2026-05-18T03:16:27Z"},{"alias_kind":"pith_short_12","alias_value":"PWUTQSYV2QAP","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"PWUTQSYV2QAPQNMH","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"PWUTQSYV","created_at":"2026-05-18T12:27:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:PWUTQSYV2QAPQNMHI6QHMKGEVO","target":"record","payload":{"canonical_record":{"source":{"id":"1308.1876","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-08T15:33:47Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"99b37dc00c307390bb1fed96c14811ebf36b88305a9cdb4c8bdccf972a045428","abstract_canon_sha256":"361cf372ca6d63866074d83032af8cdb0897e9e5abfcd8802df5abbc8c8009cd"},"schema_version":"1.0"},"canonical_sha256":"7da9384b15d400f8358747a07628c4aba0af730a79afffaf2500a450138cfdaa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:16:27.493009Z","signature_b64":"KzpxEBYH0uy0yFGt7XsftZPDiFwhzkfm4KDxEQuc26puOdPQ0lKuigwcMv1rhmc4nENB8HlxUumMRQ7zP18uAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7da9384b15d400f8358747a07628c4aba0af730a79afffaf2500a450138cfdaa","last_reissued_at":"2026-05-18T03:16:27.492356Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:16:27.492356Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.1876","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":"2026-05-18T03:16:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"urYZ2cn0qBNOsBaTMONNJQ2N2TZyvdJJYDTtl6+lysNXIDeBCMCI7gr4152FdgKnMy/R6yBYXdMkgx45RKIXDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T08:11:10.966858Z"},"content_sha256":"344d3e8b06d651ac3449425617e51dbe44bb4c09dbf616233d0f64961b933dfd","schema_version":"1.0","event_id":"sha256:344d3e8b06d651ac3449425617e51dbe44bb4c09dbf616233d0f64961b933dfd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:PWUTQSYV2QAPQNMHI6QHMKGEVO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Non-Alternating Algorithm for Joint BS-RS Precoding Design in Two-Way Relay Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Ehsan Zandi, Gerd Ascheid, Guido Dartmann, Rudolf Mathar","submitted_at":"2013-08-08T15:33:47Z","abstract_excerpt":"Cooperative relay systems have become an active area of research during recent years since they help cellular networks to enhance data rate and coverage. In this paper we develop a method to jointly optimize precoding matrices for amplify-and-forward relay station and base station. Our objective is to increase max-min SINR fairness within co-channel users in a cell. The main achievement of this work is avoiding any tedious alternating optimization for joint design of RS/BS precoders, in order to save complexity. Moreover, no convex solver is required in this method. RS precoding is done by tra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1876","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":"2026-05-18T03:16:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"caVejzsNBr5D+jN5KMtriJUyP3Gd1Gptwfc1ozjTY1OCnul1lRPnIMdUEDiz9drbax7CxalpiSMFiuVxe7vFBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T08:11:10.967182Z"},"content_sha256":"cf73e6072623451e62668f9227b6f8ad8abb0de56ff24e5a1b0b932c35401fd8","schema_version":"1.0","event_id":"sha256:cf73e6072623451e62668f9227b6f8ad8abb0de56ff24e5a1b0b932c35401fd8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO/bundle.json","state_url":"https://pith.science/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO/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":"2026-06-27T08:11:10Z","links":{"resolver":"https://pith.science/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO","bundle":"https://pith.science/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO/bundle.json","state":"https://pith.science/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PWUTQSYV2QAPQNMHI6QHMKGEVO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:PWUTQSYV2QAPQNMHI6QHMKGEVO","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":"361cf372ca6d63866074d83032af8cdb0897e9e5abfcd8802df5abbc8c8009cd","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-08T15:33:47Z","title_canon_sha256":"99b37dc00c307390bb1fed96c14811ebf36b88305a9cdb4c8bdccf972a045428"},"schema_version":"1.0","source":{"id":"1308.1876","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.1876","created_at":"2026-05-18T03:16:27Z"},{"alias_kind":"arxiv_version","alias_value":"1308.1876v1","created_at":"2026-05-18T03:16:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.1876","created_at":"2026-05-18T03:16:27Z"},{"alias_kind":"pith_short_12","alias_value":"PWUTQSYV2QAP","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"PWUTQSYV2QAPQNMH","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"PWUTQSYV","created_at":"2026-05-18T12:27:57Z"}],"graph_snapshots":[{"event_id":"sha256:cf73e6072623451e62668f9227b6f8ad8abb0de56ff24e5a1b0b932c35401fd8","target":"graph","created_at":"2026-05-18T03:16:27Z","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":"Cooperative relay systems have become an active area of research during recent years since they help cellular networks to enhance data rate and coverage. In this paper we develop a method to jointly optimize precoding matrices for amplify-and-forward relay station and base station. Our objective is to increase max-min SINR fairness within co-channel users in a cell. The main achievement of this work is avoiding any tedious alternating optimization for joint design of RS/BS precoders, in order to save complexity. Moreover, no convex solver is required in this method. RS precoding is done by tra","authors_text":"Ehsan Zandi, Gerd Ascheid, Guido Dartmann, Rudolf Mathar","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-08T15:33:47Z","title":"A Non-Alternating Algorithm for Joint BS-RS Precoding Design in Two-Way Relay Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1876","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":"sha256:344d3e8b06d651ac3449425617e51dbe44bb4c09dbf616233d0f64961b933dfd","target":"record","created_at":"2026-05-18T03:16:27Z","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":"361cf372ca6d63866074d83032af8cdb0897e9e5abfcd8802df5abbc8c8009cd","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2013-08-08T15:33:47Z","title_canon_sha256":"99b37dc00c307390bb1fed96c14811ebf36b88305a9cdb4c8bdccf972a045428"},"schema_version":"1.0","source":{"id":"1308.1876","kind":"arxiv","version":1}},"canonical_sha256":"7da9384b15d400f8358747a07628c4aba0af730a79afffaf2500a450138cfdaa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7da9384b15d400f8358747a07628c4aba0af730a79afffaf2500a450138cfdaa","first_computed_at":"2026-05-18T03:16:27.492356Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:16:27.492356Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KzpxEBYH0uy0yFGt7XsftZPDiFwhzkfm4KDxEQuc26puOdPQ0lKuigwcMv1rhmc4nENB8HlxUumMRQ7zP18uAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:16:27.493009Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.1876","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:344d3e8b06d651ac3449425617e51dbe44bb4c09dbf616233d0f64961b933dfd","sha256:cf73e6072623451e62668f9227b6f8ad8abb0de56ff24e5a1b0b932c35401fd8"],"state_sha256":"8d53f9efc8c8ce61ec872a4a29607deae67a450682b7cf98b6187b5c600be61c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4ni4kCDhyjmRUYzb3GsjT305N4e36TrXDsjLEicKaV7mX4iEJZ4UPbN+HNhAAGzlU3w79e0JvubHeNuysvr7Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T08:11:10.968975Z","bundle_sha256":"9ce1163553bbf098a568276b07a01034524f892370e14c66be61bc79d32ef7f4"}}