{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:7EMAD6GFK2LDMF3DWJMGLNPGKK","short_pith_number":"pith:7EMAD6GF","canonical_record":{"source":{"id":"1006.4358","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2010-06-22T19:59:00Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"37492cbc90266e9fb3ce37f7e14458d5f0941067a614fe04c91f3cd894072b00","abstract_canon_sha256":"f7d59cb9260c875ff583bd88bbac6f8780e1b2657405150be53582acf407e6b8"},"schema_version":"1.0"},"canonical_sha256":"f91801f8c55696361763b25865b5e6528d1251b77e57253b411925141b592afd","source":{"kind":"arxiv","id":"1006.4358","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.4358","created_at":"2026-05-18T03:58:05Z"},{"alias_kind":"arxiv_version","alias_value":"1006.4358v2","created_at":"2026-05-18T03:58:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.4358","created_at":"2026-05-18T03:58:05Z"},{"alias_kind":"pith_short_12","alias_value":"7EMAD6GFK2LD","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"7EMAD6GFK2LDMF3D","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"7EMAD6GF","created_at":"2026-05-18T12:26:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:7EMAD6GFK2LDMF3DWJMGLNPGKK","target":"record","payload":{"canonical_record":{"source":{"id":"1006.4358","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2010-06-22T19:59:00Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"37492cbc90266e9fb3ce37f7e14458d5f0941067a614fe04c91f3cd894072b00","abstract_canon_sha256":"f7d59cb9260c875ff583bd88bbac6f8780e1b2657405150be53582acf407e6b8"},"schema_version":"1.0"},"canonical_sha256":"f91801f8c55696361763b25865b5e6528d1251b77e57253b411925141b592afd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:58:05.164269Z","signature_b64":"UG1jRV3Bzveu1hEmEMpNGpG1T/X1GjJh6cupiTBHuA/zCBB+VfZnP6+wBqpXnFgBC7U84qF7kNye1etGzGenAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f91801f8c55696361763b25865b5e6528d1251b77e57253b411925141b592afd","last_reissued_at":"2026-05-18T03:58:05.163831Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:58:05.163831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1006.4358","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:58:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"69LdXoT04t0If/sXz2xN0jSh500e4WDTLNcW6uwBhpDeL/CWqDFGuRgY/T0z326CgEz/ypmfP6yfbko/EKrcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T21:54:57.270504Z"},"content_sha256":"09cf708e6fa9bf78de373a0182cb81c290e7d723e2afd24b34814015051e3c39","schema_version":"1.0","event_id":"sha256:09cf708e6fa9bf78de373a0182cb81c290e7d723e2afd24b34814015051e3c39"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:7EMAD6GFK2LDMF3DWJMGLNPGKK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Combining Channel Output Feedback and CSI Feedback for MIMO Wireless Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"David J. Love, Mayur Agrawal, Venkataramanan Balakrishnan","submitted_at":"2010-06-22T19:59:00Z","abstract_excerpt":"The use of channel output feedback to improve the reliability of fading channels has received scant attention in the literature. In most work on feedback for fading channels, only channel state information (CSI) feedback has been exploited for coding at the transmitter. In this work, the design of a coding scheme for multiple-input multiple-output (MIMO) fading systems with channel output and channel state feedback at the transmitter is considered. Under the assumption of additive white Gaussian noise and an independent and identically distributed fading process, a simple linear coding strateg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.4358","kind":"arxiv","version":2},"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":"2026-05-18T03:58:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZF8YSg1Rzyx3bSfME/dG0BJWFlfDK5Cjh1U7YdQJkEOz4zW87lXdRbseIN0iadcQeyWrkRaAecImsxu6pcHqCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T21:54:57.270856Z"},"content_sha256":"d1d88fdeb2803ff963970aca0ab997e7ffcb0417d28a0fd1a7e99737857787aa","schema_version":"1.0","event_id":"sha256:d1d88fdeb2803ff963970aca0ab997e7ffcb0417d28a0fd1a7e99737857787aa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK/bundle.json","state_url":"https://pith.science/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK/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":"2026-05-19T21:54:57Z","links":{"resolver":"https://pith.science/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK","bundle":"https://pith.science/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK/bundle.json","state":"https://pith.science/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7EMAD6GFK2LDMF3DWJMGLNPGKK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:7EMAD6GFK2LDMF3DWJMGLNPGKK","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":"f7d59cb9260c875ff583bd88bbac6f8780e1b2657405150be53582acf407e6b8","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2010-06-22T19:59:00Z","title_canon_sha256":"37492cbc90266e9fb3ce37f7e14458d5f0941067a614fe04c91f3cd894072b00"},"schema_version":"1.0","source":{"id":"1006.4358","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.4358","created_at":"2026-05-18T03:58:05Z"},{"alias_kind":"arxiv_version","alias_value":"1006.4358v2","created_at":"2026-05-18T03:58:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.4358","created_at":"2026-05-18T03:58:05Z"},{"alias_kind":"pith_short_12","alias_value":"7EMAD6GFK2LD","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"7EMAD6GFK2LDMF3D","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"7EMAD6GF","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:d1d88fdeb2803ff963970aca0ab997e7ffcb0417d28a0fd1a7e99737857787aa","target":"graph","created_at":"2026-05-18T03:58:05Z","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 use of channel output feedback to improve the reliability of fading channels has received scant attention in the literature. In most work on feedback for fading channels, only channel state information (CSI) feedback has been exploited for coding at the transmitter. In this work, the design of a coding scheme for multiple-input multiple-output (MIMO) fading systems with channel output and channel state feedback at the transmitter is considered. Under the assumption of additive white Gaussian noise and an independent and identically distributed fading process, a simple linear coding strateg","authors_text":"David J. Love, Mayur Agrawal, Venkataramanan Balakrishnan","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2010-06-22T19:59:00Z","title":"Combining Channel Output Feedback and CSI Feedback for MIMO Wireless Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.4358","kind":"arxiv","version":2},"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":"sha256:09cf708e6fa9bf78de373a0182cb81c290e7d723e2afd24b34814015051e3c39","target":"record","created_at":"2026-05-18T03:58:05Z","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":"f7d59cb9260c875ff583bd88bbac6f8780e1b2657405150be53582acf407e6b8","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2010-06-22T19:59:00Z","title_canon_sha256":"37492cbc90266e9fb3ce37f7e14458d5f0941067a614fe04c91f3cd894072b00"},"schema_version":"1.0","source":{"id":"1006.4358","kind":"arxiv","version":2}},"canonical_sha256":"f91801f8c55696361763b25865b5e6528d1251b77e57253b411925141b592afd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f91801f8c55696361763b25865b5e6528d1251b77e57253b411925141b592afd","first_computed_at":"2026-05-18T03:58:05.163831Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:58:05.163831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UG1jRV3Bzveu1hEmEMpNGpG1T/X1GjJh6cupiTBHuA/zCBB+VfZnP6+wBqpXnFgBC7U84qF7kNye1etGzGenAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:58:05.164269Z","signed_message":"canonical_sha256_bytes"},"source_id":"1006.4358","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:09cf708e6fa9bf78de373a0182cb81c290e7d723e2afd24b34814015051e3c39","sha256:d1d88fdeb2803ff963970aca0ab997e7ffcb0417d28a0fd1a7e99737857787aa"],"state_sha256":"ce18df1c04ad7ec380c761a907a9d6639f37b44416b89bfa6ad5e2454b9273b1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IH0Q3N+NtEDVCKZnejI5xdPLn/w0vznI1WzMFSivXOQ8TLCiiolnqd/9eZ+/TwspvcaGM2myOwpnFuhCA8LPDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T21:54:57.273346Z","bundle_sha256":"c6408f3053fe9693a2106e9cf57232085bea9cb06870ca233fcbf83e1611c61a"}}