{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:IPTIZCWKP2DY7H3KKUZOV3GSDC","short_pith_number":"pith:IPTIZCWK","schema_version":"1.0","canonical_sha256":"43e68c8aca7e878f9f6a5532eaecd218a13129f28ab0874d0563429e8aa1db8b","source":{"kind":"arxiv","id":"1903.05464","version":1},"attestation_state":"computed","paper":{"title":"Channel Protection using Random Modulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Ali Ahmed, Humera Hameed","submitted_at":"2019-03-12T10:10:02Z","abstract_excerpt":"This paper shows that modulation protects a bandlimited signal against convolutive interference. A signal $s(t)$, bandlimited to $B$Hz, is modulated (pointwise multiplied) with a known random sign sequence $r(t)$, alternating at a rate $Q$, and the resultant \\textit{spread spectrum} signal $s(t) \\odot r(t)$ is convolved against an $M$-tap channel impulse response $h(t)$ to yield the observed signal $y(t)= (s(t)\\odot r(t))\\circledast h(t),$ where $\\odot$ and $\\circledast$ denote pointwise multiplication, and circular convolution, respectively.\n  We show that both $s(t)$, and $h(t)$ can be prova"},"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":"1903.05464","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-03-12T10:10:02Z","cross_cats_sorted":[],"title_canon_sha256":"45542a4d98896ab7efe75444acae4a965cc087464fe9b70fc649f31fed2b2d00","abstract_canon_sha256":"30b8c6977d1fc9e578d80cb168529c64db1c480437f8f190b7f4cbef2ef9c464"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:20.879816Z","signature_b64":"s6iN/hFb3pOQr0cwcIz1d0zLSfC9oBAmY2M5Vvp9HAGqAR0t8zkzho69Lg73X8gERAC6GMwn9t3UcDL8/VLQBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"43e68c8aca7e878f9f6a5532eaecd218a13129f28ab0874d0563429e8aa1db8b","last_reissued_at":"2026-05-17T23:51:20.879265Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:20.879265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Channel Protection using Random Modulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Ali Ahmed, Humera Hameed","submitted_at":"2019-03-12T10:10:02Z","abstract_excerpt":"This paper shows that modulation protects a bandlimited signal against convolutive interference. A signal $s(t)$, bandlimited to $B$Hz, is modulated (pointwise multiplied) with a known random sign sequence $r(t)$, alternating at a rate $Q$, and the resultant \\textit{spread spectrum} signal $s(t) \\odot r(t)$ is convolved against an $M$-tap channel impulse response $h(t)$ to yield the observed signal $y(t)= (s(t)\\odot r(t))\\circledast h(t),$ where $\\odot$ and $\\circledast$ denote pointwise multiplication, and circular convolution, respectively.\n  We show that both $s(t)$, and $h(t)$ can be prova"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.05464","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":"1903.05464","created_at":"2026-05-17T23:51:20.879363+00:00"},{"alias_kind":"arxiv_version","alias_value":"1903.05464v1","created_at":"2026-05-17T23:51:20.879363+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.05464","created_at":"2026-05-17T23:51:20.879363+00:00"},{"alias_kind":"pith_short_12","alias_value":"IPTIZCWKP2DY","created_at":"2026-05-18T12:33:18.533446+00:00"},{"alias_kind":"pith_short_16","alias_value":"IPTIZCWKP2DY7H3K","created_at":"2026-05-18T12:33:18.533446+00:00"},{"alias_kind":"pith_short_8","alias_value":"IPTIZCWK","created_at":"2026-05-18T12:33:18.533446+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/IPTIZCWKP2DY7H3KKUZOV3GSDC","json":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC.json","graph_json":"https://pith.science/api/pith-number/IPTIZCWKP2DY7H3KKUZOV3GSDC/graph.json","events_json":"https://pith.science/api/pith-number/IPTIZCWKP2DY7H3KKUZOV3GSDC/events.json","paper":"https://pith.science/paper/IPTIZCWK"},"agent_actions":{"view_html":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC","download_json":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC.json","view_paper":"https://pith.science/paper/IPTIZCWK","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1903.05464&json=true","fetch_graph":"https://pith.science/api/pith-number/IPTIZCWKP2DY7H3KKUZOV3GSDC/graph.json","fetch_events":"https://pith.science/api/pith-number/IPTIZCWKP2DY7H3KKUZOV3GSDC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC/action/storage_attestation","attest_author":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC/action/author_attestation","sign_citation":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC/action/citation_signature","submit_replication":"https://pith.science/pith/IPTIZCWKP2DY7H3KKUZOV3GSDC/action/replication_record"}},"created_at":"2026-05-17T23:51:20.879363+00:00","updated_at":"2026-05-17T23:51:20.879363+00:00"}