{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:6RSKS5MQJN3PF2TNFTZ6T4KUSB","short_pith_number":"pith:6RSKS5MQ","canonical_record":{"source":{"id":"0905.0838","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2009-05-06T14:19:11Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"f7d8f4721950a7b319080b6803d40e637fdd04f56b8e1d9d2cf6c2d04c28d652","abstract_canon_sha256":"ca9a2c3876a5479f37f6dd4c9d8e7a229ede9c991d0e71bf4aeb966fbc57b627"},"schema_version":"1.0"},"canonical_sha256":"f464a975904b76f2ea6d2cf3e9f1549053541a1a437b0e52d3d10deb65d75a49","source":{"kind":"arxiv","id":"0905.0838","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.0838","created_at":"2026-05-18T00:57:58Z"},{"alias_kind":"arxiv_version","alias_value":"0905.0838v1","created_at":"2026-05-18T00:57:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.0838","created_at":"2026-05-18T00:57:58Z"},{"alias_kind":"pith_short_12","alias_value":"6RSKS5MQJN3P","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"6RSKS5MQJN3PF2TN","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"6RSKS5MQ","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:6RSKS5MQJN3PF2TNFTZ6T4KUSB","target":"record","payload":{"canonical_record":{"source":{"id":"0905.0838","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2009-05-06T14:19:11Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"f7d8f4721950a7b319080b6803d40e637fdd04f56b8e1d9d2cf6c2d04c28d652","abstract_canon_sha256":"ca9a2c3876a5479f37f6dd4c9d8e7a229ede9c991d0e71bf4aeb966fbc57b627"},"schema_version":"1.0"},"canonical_sha256":"f464a975904b76f2ea6d2cf3e9f1549053541a1a437b0e52d3d10deb65d75a49","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:57:58.209163Z","signature_b64":"/g1SwmL3rHsQMKyPtbtmsh80fOFAwvYX8t8rHVJarfCQe7BG35e00LSsBz6t6XBJM2AWMGxBVpSf2oZNaYfiDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f464a975904b76f2ea6d2cf3e9f1549053541a1a437b0e52d3d10deb65d75a49","last_reissued_at":"2026-05-18T00:57:58.208738Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:57:58.208738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0905.0838","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":"2026-05-18T00:57:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TLL5r2IRQpr2C8UprwE/HoihMssJzFXlv11S0Mw60MtgwJkc5M708Scy9juxfk2QNNtbEdpVK+pcXGCDP8jvBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T09:58:22.243818Z"},"content_sha256":"bdba06ea8c28bf034025ba62fd288546d8d316610a01957ebc8d23b125484752","schema_version":"1.0","event_id":"sha256:bdba06ea8c28bf034025ba62fd288546d8d316610a01957ebc8d23b125484752"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:6RSKS5MQJN3PF2TNFTZ6T4KUSB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"What is the Value of Joint Processing of Pilots and Data in Block-Fading Channels?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Angel Lozano, Nihar Jindal, Thomas L. Marzetta","submitted_at":"2009-05-06T14:19:11Z","abstract_excerpt":"The spectral efficiency achievable with joint processing of pilot and data symbol observations is compared with that achievable through the conventional (separate) approach of first estimating the channel on the basis of the pilot symbols alone, and subsequently detecting the data symbols. Studied on the basis of a mutual information lower bound, joint processing is found to provide a non-negligible advantage relative to separate processing, particularly for fast fading. It is shown that, regardless of the fading rate, only a very small number of pilot symbols (at most one per transmit antenna"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.0838","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":"2026-05-18T00:57:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5B8ltIOC1pENw/8MBJGwwv8kgoJni69I9iCqSv9UEKUcVPe69EU8HZqMqf8fmO0L29aCQq4v8ggAbLDZi5OuDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T09:58:22.244573Z"},"content_sha256":"aeca6bfb16c110ab1d3c587c3eb3aa9d4a6c41999dbff0af83d6ed938b58a610","schema_version":"1.0","event_id":"sha256:aeca6bfb16c110ab1d3c587c3eb3aa9d4a6c41999dbff0af83d6ed938b58a610"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB/bundle.json","state_url":"https://pith.science/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB/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":"2026-05-23T09:58:22Z","links":{"resolver":"https://pith.science/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB","bundle":"https://pith.science/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB/bundle.json","state":"https://pith.science/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6RSKS5MQJN3PF2TNFTZ6T4KUSB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:6RSKS5MQJN3PF2TNFTZ6T4KUSB","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":"ca9a2c3876a5479f37f6dd4c9d8e7a229ede9c991d0e71bf4aeb966fbc57b627","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2009-05-06T14:19:11Z","title_canon_sha256":"f7d8f4721950a7b319080b6803d40e637fdd04f56b8e1d9d2cf6c2d04c28d652"},"schema_version":"1.0","source":{"id":"0905.0838","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.0838","created_at":"2026-05-18T00:57:58Z"},{"alias_kind":"arxiv_version","alias_value":"0905.0838v1","created_at":"2026-05-18T00:57:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.0838","created_at":"2026-05-18T00:57:58Z"},{"alias_kind":"pith_short_12","alias_value":"6RSKS5MQJN3P","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"6RSKS5MQJN3PF2TN","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"6RSKS5MQ","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:aeca6bfb16c110ab1d3c587c3eb3aa9d4a6c41999dbff0af83d6ed938b58a610","target":"graph","created_at":"2026-05-18T00:57:58Z","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 spectral efficiency achievable with joint processing of pilot and data symbol observations is compared with that achievable through the conventional (separate) approach of first estimating the channel on the basis of the pilot symbols alone, and subsequently detecting the data symbols. Studied on the basis of a mutual information lower bound, joint processing is found to provide a non-negligible advantage relative to separate processing, particularly for fast fading. It is shown that, regardless of the fading rate, only a very small number of pilot symbols (at most one per transmit antenna","authors_text":"Angel Lozano, Nihar Jindal, Thomas L. Marzetta","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2009-05-06T14:19:11Z","title":"What is the Value of Joint Processing of Pilots and Data in Block-Fading Channels?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.0838","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:bdba06ea8c28bf034025ba62fd288546d8d316610a01957ebc8d23b125484752","target":"record","created_at":"2026-05-18T00:57:58Z","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":"ca9a2c3876a5479f37f6dd4c9d8e7a229ede9c991d0e71bf4aeb966fbc57b627","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2009-05-06T14:19:11Z","title_canon_sha256":"f7d8f4721950a7b319080b6803d40e637fdd04f56b8e1d9d2cf6c2d04c28d652"},"schema_version":"1.0","source":{"id":"0905.0838","kind":"arxiv","version":1}},"canonical_sha256":"f464a975904b76f2ea6d2cf3e9f1549053541a1a437b0e52d3d10deb65d75a49","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f464a975904b76f2ea6d2cf3e9f1549053541a1a437b0e52d3d10deb65d75a49","first_computed_at":"2026-05-18T00:57:58.208738Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:57:58.208738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/g1SwmL3rHsQMKyPtbtmsh80fOFAwvYX8t8rHVJarfCQe7BG35e00LSsBz6t6XBJM2AWMGxBVpSf2oZNaYfiDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:57:58.209163Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.0838","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bdba06ea8c28bf034025ba62fd288546d8d316610a01957ebc8d23b125484752","sha256:aeca6bfb16c110ab1d3c587c3eb3aa9d4a6c41999dbff0af83d6ed938b58a610"],"state_sha256":"338582e0e34a9232ea6b4c2e45bde689c3ce478390a045dd0e4d08075157c418"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1j4PMHN9GFX62yrVKHmwp5sQYOqwtjIcMkHOTR8heQgeclqZxBe4nt/9H1Fwl1+S1uWDGUeFo7lLn4Sgy4LJBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T09:58:22.248479Z","bundle_sha256":"2117bc12d70f539ca400804de46b723c4476e257bc8018f9a4eea6b48c835b4b"}}