{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:UTDWZB5Q2B5GOZDFS6UY73WXVW","short_pith_number":"pith:UTDWZB5Q","canonical_record":{"source":{"id":"1407.0901","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-03T12:58:16Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"19b165b7cff370de5e71e4e39792dc1c77d4ccabfbae5a3d3e829c2ce29f3c5e","abstract_canon_sha256":"721b8766d072fcab67c76ace77991824858246c843f961c900afaf40009fa406"},"schema_version":"1.0"},"canonical_sha256":"a4c76c87b0d07a67646597a98feed7adafe13741b43ef8ceb9d2eff1c31ca004","source":{"kind":"arxiv","id":"1407.0901","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.0901","created_at":"2026-05-18T02:42:39Z"},{"alias_kind":"arxiv_version","alias_value":"1407.0901v2","created_at":"2026-05-18T02:42:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.0901","created_at":"2026-05-18T02:42:39Z"},{"alias_kind":"pith_short_12","alias_value":"UTDWZB5Q2B5G","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"UTDWZB5Q2B5GOZDF","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"UTDWZB5Q","created_at":"2026-05-18T12:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:UTDWZB5Q2B5GOZDFS6UY73WXVW","target":"record","payload":{"canonical_record":{"source":{"id":"1407.0901","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-03T12:58:16Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"19b165b7cff370de5e71e4e39792dc1c77d4ccabfbae5a3d3e829c2ce29f3c5e","abstract_canon_sha256":"721b8766d072fcab67c76ace77991824858246c843f961c900afaf40009fa406"},"schema_version":"1.0"},"canonical_sha256":"a4c76c87b0d07a67646597a98feed7adafe13741b43ef8ceb9d2eff1c31ca004","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:42:39.040303Z","signature_b64":"w6XLqMqbuoqSZN9y0SJh/rI/MuDhAE99na+RaTCsm5BD47OQvRcsCJRk1B7NGD07QwOHPtI4JnfJ7wXJErKWCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a4c76c87b0d07a67646597a98feed7adafe13741b43ef8ceb9d2eff1c31ca004","last_reissued_at":"2026-05-18T02:42:39.039754Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:42:39.039754Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.0901","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":"2026-05-18T02:42:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x1CVJTK1vO+iOjQN/negt7Rta7HrzO5kpxp5pteCyWrJmtI0ca+opyBwPLxJBLXOwEhVN71eQIaSeNXQpAZ0Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T00:24:53.679546Z"},"content_sha256":"a8c2aa392475e53d591363940636da7ac301ee206494624449b468f710dd346d","schema_version":"1.0","event_id":"sha256:a8c2aa392475e53d591363940636da7ac301ee206494624449b468f710dd346d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:UTDWZB5Q2B5GOZDFS6UY73WXVW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enhanced Trellis Coded Multiple Access (ETCMA)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Alberto G. Perotti, Branislav M. Popovic","submitted_at":"2014-07-03T12:58:16Z","abstract_excerpt":"We propose an enhanced version of trellis coded multiple access (TCMA), an overloaded multiple access scheme that outperforms the original TCMA in terms of achieved spectral efficiency. Enhanced TCMA (ETCMA) performs simultaneous transmission of multiple data streams intended for users experiencing similar signal-to-noise ratios and can be employed both in the uplink and in the downlink of wireless systems, thus overcoming one of the main limitations of TCMA. Thanks to a new receiver algorithm, ETCMA is capable of delivering a significantly higher spectral efficiency. We show that ETCMA approa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.0901","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":"2026-05-18T02:42:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rixOjpKbrqjEIOZkZMmsOI3roNuM/ZJSbJ30Ch0/UQFCSg5jsxhtyyFdmAGVJgaFMqbJWOaYvr4d1Npcp/RlCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T00:24:53.680193Z"},"content_sha256":"b7ec0975f857081cb49e46241d70f2b608628f372ac4a483d713ca770db2eaaf","schema_version":"1.0","event_id":"sha256:b7ec0975f857081cb49e46241d70f2b608628f372ac4a483d713ca770db2eaaf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW/bundle.json","state_url":"https://pith.science/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW/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":"2026-06-08T00:24:53Z","links":{"resolver":"https://pith.science/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW","bundle":"https://pith.science/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW/bundle.json","state":"https://pith.science/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UTDWZB5Q2B5GOZDFS6UY73WXVW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:UTDWZB5Q2B5GOZDFS6UY73WXVW","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":"721b8766d072fcab67c76ace77991824858246c843f961c900afaf40009fa406","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-03T12:58:16Z","title_canon_sha256":"19b165b7cff370de5e71e4e39792dc1c77d4ccabfbae5a3d3e829c2ce29f3c5e"},"schema_version":"1.0","source":{"id":"1407.0901","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.0901","created_at":"2026-05-18T02:42:39Z"},{"alias_kind":"arxiv_version","alias_value":"1407.0901v2","created_at":"2026-05-18T02:42:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.0901","created_at":"2026-05-18T02:42:39Z"},{"alias_kind":"pith_short_12","alias_value":"UTDWZB5Q2B5G","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"UTDWZB5Q2B5GOZDF","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"UTDWZB5Q","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:b7ec0975f857081cb49e46241d70f2b608628f372ac4a483d713ca770db2eaaf","target":"graph","created_at":"2026-05-18T02:42:39Z","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":"We propose an enhanced version of trellis coded multiple access (TCMA), an overloaded multiple access scheme that outperforms the original TCMA in terms of achieved spectral efficiency. Enhanced TCMA (ETCMA) performs simultaneous transmission of multiple data streams intended for users experiencing similar signal-to-noise ratios and can be employed both in the uplink and in the downlink of wireless systems, thus overcoming one of the main limitations of TCMA. Thanks to a new receiver algorithm, ETCMA is capable of delivering a significantly higher spectral efficiency. We show that ETCMA approa","authors_text":"Alberto G. Perotti, Branislav M. Popovic","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-03T12:58:16Z","title":"Enhanced Trellis Coded Multiple Access (ETCMA)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.0901","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:a8c2aa392475e53d591363940636da7ac301ee206494624449b468f710dd346d","target":"record","created_at":"2026-05-18T02:42:39Z","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":"721b8766d072fcab67c76ace77991824858246c843f961c900afaf40009fa406","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2014-07-03T12:58:16Z","title_canon_sha256":"19b165b7cff370de5e71e4e39792dc1c77d4ccabfbae5a3d3e829c2ce29f3c5e"},"schema_version":"1.0","source":{"id":"1407.0901","kind":"arxiv","version":2}},"canonical_sha256":"a4c76c87b0d07a67646597a98feed7adafe13741b43ef8ceb9d2eff1c31ca004","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a4c76c87b0d07a67646597a98feed7adafe13741b43ef8ceb9d2eff1c31ca004","first_computed_at":"2026-05-18T02:42:39.039754Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:42:39.039754Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"w6XLqMqbuoqSZN9y0SJh/rI/MuDhAE99na+RaTCsm5BD47OQvRcsCJRk1B7NGD07QwOHPtI4JnfJ7wXJErKWCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:42:39.040303Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.0901","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a8c2aa392475e53d591363940636da7ac301ee206494624449b468f710dd346d","sha256:b7ec0975f857081cb49e46241d70f2b608628f372ac4a483d713ca770db2eaaf"],"state_sha256":"e37685d2c980a7a0c75244ece8c37420069f6cad9a36dc13c7b6aabf7e444220"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dPkR7vulDBWlxr49pFWqDrOVRqzrhPSKUmiyAHZH9TdF0OOMweoAAzIOh15EIQN39eg+jD3RViI2zMLc7E1iBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T00:24:53.684099Z","bundle_sha256":"8064df8a5d72b37d57f6a48647a8f44fc015b342b0ebd36549f9939463f1d64c"}}