{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:3XBPK6CIR7ISCN2ZDZ7MFLX6SC","short_pith_number":"pith:3XBPK6CI","canonical_record":{"source":{"id":"1605.00760","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-05-03T06:50:10Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"edfb620890554778d982a00fdbb46d7668817ce2c23040bdcb646843d728c522","abstract_canon_sha256":"1c1faf710f96cd4cdeea8a01e0d8f06411ebcab94dfe3b30dc52b6dd91cccfee"},"schema_version":"1.0"},"canonical_sha256":"ddc2f578488fd12137591e7ec2aefe9099674b13ad5ac15582ba8f03c41a0509","source":{"kind":"arxiv","id":"1605.00760","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.00760","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"arxiv_version","alias_value":"1605.00760v1","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.00760","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"pith_short_12","alias_value":"3XBPK6CIR7IS","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"3XBPK6CIR7ISCN2Z","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"3XBPK6CI","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:3XBPK6CIR7ISCN2ZDZ7MFLX6SC","target":"record","payload":{"canonical_record":{"source":{"id":"1605.00760","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-05-03T06:50:10Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"edfb620890554778d982a00fdbb46d7668817ce2c23040bdcb646843d728c522","abstract_canon_sha256":"1c1faf710f96cd4cdeea8a01e0d8f06411ebcab94dfe3b30dc52b6dd91cccfee"},"schema_version":"1.0"},"canonical_sha256":"ddc2f578488fd12137591e7ec2aefe9099674b13ad5ac15582ba8f03c41a0509","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:58:56.896193Z","signature_b64":"hmuaZsOCTr1KRQrrcXuVVoki0QRBEJ1gsnitwFXGb/3yzn8QW9IIOBnwY2WLB1V1SJrGQkY98xQ5odGgwgoXBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ddc2f578488fd12137591e7ec2aefe9099674b13ad5ac15582ba8f03c41a0509","last_reissued_at":"2026-05-18T00:58:56.895647Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:58:56.895647Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.00760","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":"2026-05-18T00:58:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6ak/RTQS1rAy9DXJxEDM5Ji4nm4L/VtdRwuVDA6nUIpQHCHweQH7jwVnNe30f1HMMFpJUfcnnMXbY3A/vVgbBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:21:57.151144Z"},"content_sha256":"3cd2b73228a437c9e7ffeeecf90cd2d6be69c43b77d57054701c6e6d68296ca9","schema_version":"1.0","event_id":"sha256:3cd2b73228a437c9e7ffeeecf90cd2d6be69c43b77d57054701c6e6d68296ca9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:3XBPK6CIR7ISCN2ZDZ7MFLX6SC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fast Detection of Orthogonal Space-Time Block Codes with Unknown Channel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Guangyu Ti, Ming Li, Wenfei Liu, Xiaowen Tian","submitted_at":"2016-05-03T06:50:10Z","abstract_excerpt":"This letter investigates the problem of blind detection of orthogonal space-time block codes (OSTBC) over a quasi-static flat multiple-input multiple-output (MIMO) Rayleigh fading channel. We first introduce a core iterative least-squares (ILS) algorithm to blindly detect OSTBC signals without the knowledge of channel state information (SCI) at the receiver. This ILS algorithm has low computational complexity but may converge to local optimum which offers unreliable detection result. Then, in order to improve the detection performance, we propose an enhanced ILS (E-ILS) approach which is based"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.00760","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":"2026-05-18T00:58:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZNKRbD8qeL17Tj67oGSii9f1Ug7SkXegZ6dGHV7uisl9UZi/uZuWj8p6xH7yyu3//yScRMSK4XJ7gYLgyO2jBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:21:57.151815Z"},"content_sha256":"eb2c37b84f2768323d93e6e7939700c1f7b8c9451d224700c74f273dcafe0a2e","schema_version":"1.0","event_id":"sha256:eb2c37b84f2768323d93e6e7939700c1f7b8c9451d224700c74f273dcafe0a2e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC/bundle.json","state_url":"https://pith.science/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC/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":"2026-05-30T08:21:57Z","links":{"resolver":"https://pith.science/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC","bundle":"https://pith.science/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC/bundle.json","state":"https://pith.science/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3XBPK6CIR7ISCN2ZDZ7MFLX6SC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:3XBPK6CIR7ISCN2ZDZ7MFLX6SC","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":"1c1faf710f96cd4cdeea8a01e0d8f06411ebcab94dfe3b30dc52b6dd91cccfee","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-05-03T06:50:10Z","title_canon_sha256":"edfb620890554778d982a00fdbb46d7668817ce2c23040bdcb646843d728c522"},"schema_version":"1.0","source":{"id":"1605.00760","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.00760","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"arxiv_version","alias_value":"1605.00760v1","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.00760","created_at":"2026-05-18T00:58:56Z"},{"alias_kind":"pith_short_12","alias_value":"3XBPK6CIR7IS","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"3XBPK6CIR7ISCN2Z","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"3XBPK6CI","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:eb2c37b84f2768323d93e6e7939700c1f7b8c9451d224700c74f273dcafe0a2e","target":"graph","created_at":"2026-05-18T00:58:56Z","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":"This letter investigates the problem of blind detection of orthogonal space-time block codes (OSTBC) over a quasi-static flat multiple-input multiple-output (MIMO) Rayleigh fading channel. We first introduce a core iterative least-squares (ILS) algorithm to blindly detect OSTBC signals without the knowledge of channel state information (SCI) at the receiver. This ILS algorithm has low computational complexity but may converge to local optimum which offers unreliable detection result. Then, in order to improve the detection performance, we propose an enhanced ILS (E-ILS) approach which is based","authors_text":"Guangyu Ti, Ming Li, Wenfei Liu, Xiaowen Tian","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-05-03T06:50:10Z","title":"Fast Detection of Orthogonal Space-Time Block Codes with Unknown Channel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.00760","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":"sha256:3cd2b73228a437c9e7ffeeecf90cd2d6be69c43b77d57054701c6e6d68296ca9","target":"record","created_at":"2026-05-18T00:58:56Z","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":"1c1faf710f96cd4cdeea8a01e0d8f06411ebcab94dfe3b30dc52b6dd91cccfee","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2016-05-03T06:50:10Z","title_canon_sha256":"edfb620890554778d982a00fdbb46d7668817ce2c23040bdcb646843d728c522"},"schema_version":"1.0","source":{"id":"1605.00760","kind":"arxiv","version":1}},"canonical_sha256":"ddc2f578488fd12137591e7ec2aefe9099674b13ad5ac15582ba8f03c41a0509","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ddc2f578488fd12137591e7ec2aefe9099674b13ad5ac15582ba8f03c41a0509","first_computed_at":"2026-05-18T00:58:56.895647Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:56.895647Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hmuaZsOCTr1KRQrrcXuVVoki0QRBEJ1gsnitwFXGb/3yzn8QW9IIOBnwY2WLB1V1SJrGQkY98xQ5odGgwgoXBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:56.896193Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.00760","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3cd2b73228a437c9e7ffeeecf90cd2d6be69c43b77d57054701c6e6d68296ca9","sha256:eb2c37b84f2768323d93e6e7939700c1f7b8c9451d224700c74f273dcafe0a2e"],"state_sha256":"814cdbd9035d5c3958c1bfcbb6743995fd8db418650809098f76e0061cafa2a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ie0j3y1I4DY+XyGNbO1GacB9ttP0N5ilv+M5B6rGvnjQkT8wn4potlA3Yti5y0PsPmMkngy5YMBb6jXSSaKrDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:21:57.154912Z","bundle_sha256":"93427c6c5041b4f6674c6fc774b82cca2282db8e7b791119bcc97b14c0c0a3d4"}}