{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:GCQ3TWS6ARDI2ZUXHTSB4I73HF","short_pith_number":"pith:GCQ3TWS6","canonical_record":{"source":{"id":"1803.07318","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2018-03-20T09:24:18Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"1d6aa8a9fae11270e09719e20cd3b62ce165c41bc24d379a0130c3d5df04ca1d","abstract_canon_sha256":"ff6823736ea5fc56835e250a1c55c5a3e1ea0d42e54cd75aeef0bc1557c3e40d"},"schema_version":"1.0"},"canonical_sha256":"30a1b9da5e04468d66973ce41e23fb396019eda67f2d62e11640852b0fe25e56","source":{"kind":"arxiv","id":"1803.07318","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07318","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07318v1","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07318","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"pith_short_12","alias_value":"GCQ3TWS6ARDI","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GCQ3TWS6ARDI2ZUX","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GCQ3TWS6","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:GCQ3TWS6ARDI2ZUXHTSB4I73HF","target":"record","payload":{"canonical_record":{"source":{"id":"1803.07318","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2018-03-20T09:24:18Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"1d6aa8a9fae11270e09719e20cd3b62ce165c41bc24d379a0130c3d5df04ca1d","abstract_canon_sha256":"ff6823736ea5fc56835e250a1c55c5a3e1ea0d42e54cd75aeef0bc1557c3e40d"},"schema_version":"1.0"},"canonical_sha256":"30a1b9da5e04468d66973ce41e23fb396019eda67f2d62e11640852b0fe25e56","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:20:29.644410Z","signature_b64":"FOYQDehwZs7RqF84ZzC83L3jelqDELBOVAJJETaok9ADAaEYpTp2mQNr4tVyBv/NaEujEv/8OOPwDcspxkuoDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"30a1b9da5e04468d66973ce41e23fb396019eda67f2d62e11640852b0fe25e56","last_reissued_at":"2026-05-18T00:20:29.643868Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:20:29.643868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.07318","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":"2026-05-18T00:20:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nwq3k2hGczBCvHrcEq31iV3DjIkuGtAueoJIKPABPI4YQ+MTPxHhNIfip/rV3h+PA9S6sx2JGhZRhkf9jYlTDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:18:57.900531Z"},"content_sha256":"8d4901d90f7052aff73dbf6f6ca6b42f55afa45a4213944afd6b5da06ffb83d5","schema_version":"1.0","event_id":"sha256:8d4901d90f7052aff73dbf6f6ca6b42f55afa45a4213944afd6b5da06ffb83d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:GCQ3TWS6ARDI2ZUXHTSB4I73HF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["cs.IT","math.IT"],"primary_cat":"eess.SP","authors_text":"Ana I. P\\'erez-Neira, Anxo Tato, Carlos Mosquera, Pol Henarejos","submitted_at":"2018-03-20T09:24:18Z","abstract_excerpt":"The use of dual polarization in mobile satellite systems is very promising as a means for increasing the transmission capacity. In this paper we study a system which uses simultaneously two orthogonal polarizations in order to communicate with the users. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable throughput gains up to 100 % when compared with the single polarization system. The gateway is allowed to vary the MIMO and Modulation and Coding Schemes for each frame. The selection is done by means of a l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07318","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":"2026-05-18T00:20:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VsOKKH1bV1jZukWd6I2GagEQxsUPmK5JFoByUxxiPBZMdakYnqKs+6FPok6O2mKMgsAcbFWbCkHMxzbzHjEMBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:18:57.901252Z"},"content_sha256":"b3d25d67bc99fc32c2316ee901ffee3cee747ea0d880a811bb47d65424fe0d59","schema_version":"1.0","event_id":"sha256:b3d25d67bc99fc32c2316ee901ffee3cee747ea0d880a811bb47d65424fe0d59"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF/bundle.json","state_url":"https://pith.science/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF/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":"2026-05-27T17:18:57Z","links":{"resolver":"https://pith.science/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF","bundle":"https://pith.science/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF/bundle.json","state":"https://pith.science/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GCQ3TWS6ARDI2ZUXHTSB4I73HF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GCQ3TWS6ARDI2ZUXHTSB4I73HF","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":"ff6823736ea5fc56835e250a1c55c5a3e1ea0d42e54cd75aeef0bc1557c3e40d","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2018-03-20T09:24:18Z","title_canon_sha256":"1d6aa8a9fae11270e09719e20cd3b62ce165c41bc24d379a0130c3d5df04ca1d"},"schema_version":"1.0","source":{"id":"1803.07318","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.07318","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"arxiv_version","alias_value":"1803.07318v1","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.07318","created_at":"2026-05-18T00:20:29Z"},{"alias_kind":"pith_short_12","alias_value":"GCQ3TWS6ARDI","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GCQ3TWS6ARDI2ZUX","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GCQ3TWS6","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:b3d25d67bc99fc32c2316ee901ffee3cee747ea0d880a811bb47d65424fe0d59","target":"graph","created_at":"2026-05-18T00:20:29Z","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 dual polarization in mobile satellite systems is very promising as a means for increasing the transmission capacity. In this paper we study a system which uses simultaneously two orthogonal polarizations in order to communicate with the users. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable throughput gains up to 100 % when compared with the single polarization system. The gateway is allowed to vary the MIMO and Modulation and Coding Schemes for each frame. The selection is done by means of a l","authors_text":"Ana I. P\\'erez-Neira, Anxo Tato, Carlos Mosquera, Pol Henarejos","cross_cats":["cs.IT","math.IT"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2018-03-20T09:24:18Z","title":"Link Adaptation Algorithms for Dual Polarization Mobile Satellite Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07318","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":"sha256:8d4901d90f7052aff73dbf6f6ca6b42f55afa45a4213944afd6b5da06ffb83d5","target":"record","created_at":"2026-05-18T00:20:29Z","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":"ff6823736ea5fc56835e250a1c55c5a3e1ea0d42e54cd75aeef0bc1557c3e40d","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"eess.SP","submitted_at":"2018-03-20T09:24:18Z","title_canon_sha256":"1d6aa8a9fae11270e09719e20cd3b62ce165c41bc24d379a0130c3d5df04ca1d"},"schema_version":"1.0","source":{"id":"1803.07318","kind":"arxiv","version":1}},"canonical_sha256":"30a1b9da5e04468d66973ce41e23fb396019eda67f2d62e11640852b0fe25e56","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"30a1b9da5e04468d66973ce41e23fb396019eda67f2d62e11640852b0fe25e56","first_computed_at":"2026-05-18T00:20:29.643868Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:20:29.643868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FOYQDehwZs7RqF84ZzC83L3jelqDELBOVAJJETaok9ADAaEYpTp2mQNr4tVyBv/NaEujEv/8OOPwDcspxkuoDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:20:29.644410Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.07318","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8d4901d90f7052aff73dbf6f6ca6b42f55afa45a4213944afd6b5da06ffb83d5","sha256:b3d25d67bc99fc32c2316ee901ffee3cee747ea0d880a811bb47d65424fe0d59"],"state_sha256":"2bad8cd7b34c04f717f324607af46b243a9b55a9f1ea48b16a9665ee94d68348"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uYSv5NcUQutxsbNABAEuyLktFbMlIK3X/WK6rK5jAabmuhxPXUmkj8ZwP7c1TK7fu0ZSd6QUiRXVg7MNK0CRDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T17:18:57.905098Z","bundle_sha256":"144b7d6a060409ab4d0a5f1f1bfdaccc18f41b35a7d756715821b8e2b90a5886"}}