{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:RZVSSPLXAR4JTAZFULIM2G3S3N","short_pith_number":"pith:RZVSSPLX","canonical_record":{"source":{"id":"1907.04427","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-09T21:47:09Z","cross_cats_sorted":[],"title_canon_sha256":"8949faedf0925687ce48d50762898d628bb1f8c35e2ce910b90f892231b43ebc","abstract_canon_sha256":"8557ef236988c0dfb419a07c81b693050a690becc3d3e072fb25a842b626a4ff"},"schema_version":"1.0"},"canonical_sha256":"8e6b293d770478998325a2d0cd1b72db48c12d5fc914a4533bc0a7bbe25bb768","source":{"kind":"arxiv","id":"1907.04427","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.04427","created_at":"2026-05-17T23:41:01Z"},{"alias_kind":"arxiv_version","alias_value":"1907.04427v1","created_at":"2026-05-17T23:41:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.04427","created_at":"2026-05-17T23:41:01Z"},{"alias_kind":"pith_short_12","alias_value":"RZVSSPLXAR4J","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"RZVSSPLXAR4JTAZF","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"RZVSSPLX","created_at":"2026-05-18T12:33:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:RZVSSPLXAR4JTAZFULIM2G3S3N","target":"record","payload":{"canonical_record":{"source":{"id":"1907.04427","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-09T21:47:09Z","cross_cats_sorted":[],"title_canon_sha256":"8949faedf0925687ce48d50762898d628bb1f8c35e2ce910b90f892231b43ebc","abstract_canon_sha256":"8557ef236988c0dfb419a07c81b693050a690becc3d3e072fb25a842b626a4ff"},"schema_version":"1.0"},"canonical_sha256":"8e6b293d770478998325a2d0cd1b72db48c12d5fc914a4533bc0a7bbe25bb768","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:01.756176Z","signature_b64":"xvRO6dyey7+1kdMeaXJd6Lxolh+my2lXuod3Y7dVgVcV/ITBjaGtc7Tlo0PRmnVhO7dbNau14eTDWtTgD3TTAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8e6b293d770478998325a2d0cd1b72db48c12d5fc914a4533bc0a7bbe25bb768","last_reissued_at":"2026-05-17T23:41:01.755492Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:01.755492Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.04427","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":"2026-05-17T23:41:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+lpmUna1jlq0kxmIzZd9iYlTb0TearNjqXI5DXXO+QAzoomBUlUnyr5z2kx0okK4gbXNX/h/x0FDg5RQt3rtBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T12:04:10.805914Z"},"content_sha256":"7f79256d50f2dd64ee5da25eaa417e141fd7fbb32bc43ee82804c124b6b30c8e","schema_version":"1.0","event_id":"sha256:7f79256d50f2dd64ee5da25eaa417e141fd7fbb32bc43ee82804c124b6b30c8e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:RZVSSPLXAR4JTAZFULIM2G3S3N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Channel Estimation in mmWave Hybrid MIMO System via Off-Grid Dirichlet Kernels","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Chethan Kumar Anjinappa, Dror Baron, Ismail Guvenc, Yavuz Yapici, You Zhou","submitted_at":"2019-07-09T21:47:09Z","abstract_excerpt":"In this paper, we tackle channel estimation in millimeter-wave hybrid multiple-input multiple-output systems by considering off-grid effects. In particular, we assume that spatial parameters can take any value in the angular domain, and need not fall on predefined discretized angles. Instead of increasing the number of discretized points to combat off-grid effects, we use implicit Dirichlet kernel structure in the Fourier domain, which conventional compressed sensing methods do not use. We propose greedy low-complexity algorithms based on orthogonal matching pursuit (OMP); our core idea is to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.04427","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":"2026-05-17T23:41:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CXNACePdPIEI52/SnPcYIswUULFZsF9Cr7mozyeHKHB6YCDshq4YNS6IPmR4VriYULAQKQO9lBJ3BJqfIGEOBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T12:04:10.806340Z"},"content_sha256":"f898102193e477b6391de090f02bcd07daaac22e2228ca27f97195c21e690f0c","schema_version":"1.0","event_id":"sha256:f898102193e477b6391de090f02bcd07daaac22e2228ca27f97195c21e690f0c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RZVSSPLXAR4JTAZFULIM2G3S3N/bundle.json","state_url":"https://pith.science/pith/RZVSSPLXAR4JTAZFULIM2G3S3N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RZVSSPLXAR4JTAZFULIM2G3S3N/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":"2026-05-25T12:04:10Z","links":{"resolver":"https://pith.science/pith/RZVSSPLXAR4JTAZFULIM2G3S3N","bundle":"https://pith.science/pith/RZVSSPLXAR4JTAZFULIM2G3S3N/bundle.json","state":"https://pith.science/pith/RZVSSPLXAR4JTAZFULIM2G3S3N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RZVSSPLXAR4JTAZFULIM2G3S3N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:RZVSSPLXAR4JTAZFULIM2G3S3N","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":"8557ef236988c0dfb419a07c81b693050a690becc3d3e072fb25a842b626a4ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-09T21:47:09Z","title_canon_sha256":"8949faedf0925687ce48d50762898d628bb1f8c35e2ce910b90f892231b43ebc"},"schema_version":"1.0","source":{"id":"1907.04427","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.04427","created_at":"2026-05-17T23:41:01Z"},{"alias_kind":"arxiv_version","alias_value":"1907.04427v1","created_at":"2026-05-17T23:41:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.04427","created_at":"2026-05-17T23:41:01Z"},{"alias_kind":"pith_short_12","alias_value":"RZVSSPLXAR4J","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"RZVSSPLXAR4JTAZF","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"RZVSSPLX","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:f898102193e477b6391de090f02bcd07daaac22e2228ca27f97195c21e690f0c","target":"graph","created_at":"2026-05-17T23:41:01Z","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":"In this paper, we tackle channel estimation in millimeter-wave hybrid multiple-input multiple-output systems by considering off-grid effects. In particular, we assume that spatial parameters can take any value in the angular domain, and need not fall on predefined discretized angles. Instead of increasing the number of discretized points to combat off-grid effects, we use implicit Dirichlet kernel structure in the Fourier domain, which conventional compressed sensing methods do not use. We propose greedy low-complexity algorithms based on orthogonal matching pursuit (OMP); our core idea is to ","authors_text":"Chethan Kumar Anjinappa, Dror Baron, Ismail Guvenc, Yavuz Yapici, You Zhou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-09T21:47:09Z","title":"Channel Estimation in mmWave Hybrid MIMO System via Off-Grid Dirichlet Kernels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.04427","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":"sha256:7f79256d50f2dd64ee5da25eaa417e141fd7fbb32bc43ee82804c124b6b30c8e","target":"record","created_at":"2026-05-17T23:41:01Z","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":"8557ef236988c0dfb419a07c81b693050a690becc3d3e072fb25a842b626a4ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-07-09T21:47:09Z","title_canon_sha256":"8949faedf0925687ce48d50762898d628bb1f8c35e2ce910b90f892231b43ebc"},"schema_version":"1.0","source":{"id":"1907.04427","kind":"arxiv","version":1}},"canonical_sha256":"8e6b293d770478998325a2d0cd1b72db48c12d5fc914a4533bc0a7bbe25bb768","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8e6b293d770478998325a2d0cd1b72db48c12d5fc914a4533bc0a7bbe25bb768","first_computed_at":"2026-05-17T23:41:01.755492Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:01.755492Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xvRO6dyey7+1kdMeaXJd6Lxolh+my2lXuod3Y7dVgVcV/ITBjaGtc7Tlo0PRmnVhO7dbNau14eTDWtTgD3TTAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:01.756176Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.04427","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7f79256d50f2dd64ee5da25eaa417e141fd7fbb32bc43ee82804c124b6b30c8e","sha256:f898102193e477b6391de090f02bcd07daaac22e2228ca27f97195c21e690f0c"],"state_sha256":"3bd0fe0136562a9c024700deae1370c5122bad886d3e292fd8eaf3897b35a9e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fr/Tj+UUXS7v89M3wmOZmALPX056bIwhgL5u9kZFeEIh5tg3OgG+pxkuvGMcpMV1Tn2jFgv/M7LpXFtTLsojDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T12:04:10.808618Z","bundle_sha256":"fe8ed039a69254ba27d45d436688cfd0e246b1d0b8f2856ef996faa2e7b4430b"}}