{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:6O6HJQDJMZEN44A4XN2LLVRXEN","short_pith_number":"pith:6O6HJQDJ","schema_version":"1.0","canonical_sha256":"f3bc74c0696648de701cbb74b5d637236abd96f6fcce05e15cb7677478f3da5f","source":{"kind":"arxiv","id":"1801.07356","version":1},"attestation_state":"computed","paper":{"title":"Code-Frequency Block Group Coding for Anti-Spoofing Pilot Authentication in Multi-Antenna OFDM Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CR","eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Dongyang Xu, James A. Ritcey, Pinyi Ren, Yichen Wang","submitted_at":"2018-01-23T00:14:46Z","abstract_excerpt":"A pilot spoofer can paralyze the channel estimation in multi-user orthogonal frequency-division multiplexing (OFD- M) systems by using the same publicly-known pilot tones as legitimate nodes. This causes the problem of pilot authentication (PA). To solve this, we propose, for a two-user multi-antenna OFDM system, a code-frequency block group (CFBG) coding based PA mechanism. Here multi-user pilot information, after being randomized independently to avoid being spoofed, are converted into activation patterns of subcarrier-block groups on code-frequency domain. Those patterns, though overlapped "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1801.07356","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-01-23T00:14:46Z","cross_cats_sorted":["cs.CR","eess.SP","math.IT"],"title_canon_sha256":"efaa0ac232d80459df39ade652117c8dc3514380e86f03d196646673bc797eb9","abstract_canon_sha256":"d4aae497e0cba369fa9b67e39d172306921b1b917c2063d852316a9682fc9aee"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:25:13.038229Z","signature_b64":"8NrYjg1KEHjm0rf+1tMtZDPCrnh4YbYKT2v7JRe0Z+kedG7v34ijGTrMZ0B8Wrpc4ESLt+vsyvURYrJWX+VcAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f3bc74c0696648de701cbb74b5d637236abd96f6fcce05e15cb7677478f3da5f","last_reissued_at":"2026-05-18T00:25:13.037762Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:25:13.037762Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Code-Frequency Block Group Coding for Anti-Spoofing Pilot Authentication in Multi-Antenna OFDM Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CR","eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Dongyang Xu, James A. Ritcey, Pinyi Ren, Yichen Wang","submitted_at":"2018-01-23T00:14:46Z","abstract_excerpt":"A pilot spoofer can paralyze the channel estimation in multi-user orthogonal frequency-division multiplexing (OFD- M) systems by using the same publicly-known pilot tones as legitimate nodes. This causes the problem of pilot authentication (PA). To solve this, we propose, for a two-user multi-antenna OFDM system, a code-frequency block group (CFBG) coding based PA mechanism. Here multi-user pilot information, after being randomized independently to avoid being spoofed, are converted into activation patterns of subcarrier-block groups on code-frequency domain. Those patterns, though overlapped "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.07356","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1801.07356","created_at":"2026-05-18T00:25:13.037845+00:00"},{"alias_kind":"arxiv_version","alias_value":"1801.07356v1","created_at":"2026-05-18T00:25:13.037845+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.07356","created_at":"2026-05-18T00:25:13.037845+00:00"},{"alias_kind":"pith_short_12","alias_value":"6O6HJQDJMZEN","created_at":"2026-05-18T12:32:11.075285+00:00"},{"alias_kind":"pith_short_16","alias_value":"6O6HJQDJMZEN44A4","created_at":"2026-05-18T12:32:11.075285+00:00"},{"alias_kind":"pith_short_8","alias_value":"6O6HJQDJ","created_at":"2026-05-18T12:32:11.075285+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN","json":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN.json","graph_json":"https://pith.science/api/pith-number/6O6HJQDJMZEN44A4XN2LLVRXEN/graph.json","events_json":"https://pith.science/api/pith-number/6O6HJQDJMZEN44A4XN2LLVRXEN/events.json","paper":"https://pith.science/paper/6O6HJQDJ"},"agent_actions":{"view_html":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN","download_json":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN.json","view_paper":"https://pith.science/paper/6O6HJQDJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1801.07356&json=true","fetch_graph":"https://pith.science/api/pith-number/6O6HJQDJMZEN44A4XN2LLVRXEN/graph.json","fetch_events":"https://pith.science/api/pith-number/6O6HJQDJMZEN44A4XN2LLVRXEN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN/action/storage_attestation","attest_author":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN/action/author_attestation","sign_citation":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN/action/citation_signature","submit_replication":"https://pith.science/pith/6O6HJQDJMZEN44A4XN2LLVRXEN/action/replication_record"}},"created_at":"2026-05-18T00:25:13.037845+00:00","updated_at":"2026-05-18T00:25:13.037845+00:00"}