{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:X6KOWHDG6DT7YROVCPGUGRCJPS","short_pith_number":"pith:X6KOWHDG","canonical_record":{"source":{"id":"2101.06837","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-01-18T02:04:38Z","cross_cats_sorted":[],"title_canon_sha256":"7aafd0940446efc95417a83ac76c30ef3f9415369a9c52d24d2c1ed6a2c46d9a","abstract_canon_sha256":"bea30c552590839f9c569aa55ead03038eae2d98096b35cdf33551c6a908238e"},"schema_version":"1.0"},"canonical_sha256":"bf94eb1c66f0e7fc45d513cd4344497cbe03c864ad55a5e120a4ec447e85270e","source":{"kind":"arxiv","id":"2101.06837","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.06837","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"arxiv_version","alias_value":"2101.06837v2","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.06837","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"pith_short_12","alias_value":"X6KOWHDG6DT7","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"pith_short_16","alias_value":"X6KOWHDG6DT7YROV","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"pith_short_8","alias_value":"X6KOWHDG","created_at":"2026-07-05T02:48:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:X6KOWHDG6DT7YROVCPGUGRCJPS","target":"record","payload":{"canonical_record":{"source":{"id":"2101.06837","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-01-18T02:04:38Z","cross_cats_sorted":[],"title_canon_sha256":"7aafd0940446efc95417a83ac76c30ef3f9415369a9c52d24d2c1ed6a2c46d9a","abstract_canon_sha256":"bea30c552590839f9c569aa55ead03038eae2d98096b35cdf33551c6a908238e"},"schema_version":"1.0"},"canonical_sha256":"bf94eb1c66f0e7fc45d513cd4344497cbe03c864ad55a5e120a4ec447e85270e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:48:10.177112Z","signature_b64":"LysnWbf6rV+o4gKMUJ7XWgGw4Nt2AcNIwwIDTrWQWOg3UXXKi1p18EXxRe62LOQmq3pQ8pjy78M0a9dMMNI1Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bf94eb1c66f0e7fc45d513cd4344497cbe03c864ad55a5e120a4ec447e85270e","last_reissued_at":"2026-07-05T02:48:10.176667Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:48:10.176667Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.06837","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:48:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SdmRnS/+ekFsY70aBtlVGWTix2TySoreFNTu2HBpEx6tS6boIpzmpSMh4lxJ1QAuBbLcDHiIw7lUhGkfHObNCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T06:17:02.564160Z"},"content_sha256":"7b5c9b1c9c33a4eeb64e23d5f5fe610c377d684b46a2f96e84dfe563c77fad98","schema_version":"1.0","event_id":"sha256:7b5c9b1c9c33a4eeb64e23d5f5fe610c377d684b46a2f96e84dfe563c77fad98"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:X6KOWHDG6DT7YROVCPGUGRCJPS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Learning to Select for MIMO Radar based on Hybrid Analog-Digital Beamforming","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Athina Petropulu, Christos Masouros, Fan Liu, Konstantinos Diamantaras, Zhaoyi Xu","submitted_at":"2021-01-18T02:04:38Z","abstract_excerpt":"In this paper, we propose an energy-efficient radar beampattern design framework for a Millimeter Wave (mmWave) massive multi-input multi-output (mMIMO) system, equipped with a hybrid analog-digital (HAD) beamforming structure. Aiming to reduce the power consumption and hardware cost of the mMIMO system, we employ a machine learning approach to synthesize the probing beampattern based on a small number of RF chains and antennas. By leveraging a combination of softmax neural networks, the proposed solution is able to achieve a desirable beampattern with high accuracy."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.06837","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2101.06837/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:48:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rvvExf1++c79iqoILj+ZfAwdvNzJfQxgk/YRgiE7tK6Hnvew/rRZPLTN0lPW+5fNW3vMZBJIJt8S9H05wtm0AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T06:17:02.564671Z"},"content_sha256":"fcc1f526f6cf9013168b177ce5f27b3a4970e36486cf56126df0f701048c3a33","schema_version":"1.0","event_id":"sha256:fcc1f526f6cf9013168b177ce5f27b3a4970e36486cf56126df0f701048c3a33"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X6KOWHDG6DT7YROVCPGUGRCJPS/bundle.json","state_url":"https://pith.science/pith/X6KOWHDG6DT7YROVCPGUGRCJPS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X6KOWHDG6DT7YROVCPGUGRCJPS/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":"2026-08-11T06:17:02Z","links":{"resolver":"https://pith.science/pith/X6KOWHDG6DT7YROVCPGUGRCJPS","bundle":"https://pith.science/pith/X6KOWHDG6DT7YROVCPGUGRCJPS/bundle.json","state":"https://pith.science/pith/X6KOWHDG6DT7YROVCPGUGRCJPS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X6KOWHDG6DT7YROVCPGUGRCJPS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:X6KOWHDG6DT7YROVCPGUGRCJPS","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":"bea30c552590839f9c569aa55ead03038eae2d98096b35cdf33551c6a908238e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-01-18T02:04:38Z","title_canon_sha256":"7aafd0940446efc95417a83ac76c30ef3f9415369a9c52d24d2c1ed6a2c46d9a"},"schema_version":"1.0","source":{"id":"2101.06837","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.06837","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"arxiv_version","alias_value":"2101.06837v2","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.06837","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"pith_short_12","alias_value":"X6KOWHDG6DT7","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"pith_short_16","alias_value":"X6KOWHDG6DT7YROV","created_at":"2026-07-05T02:48:10Z"},{"alias_kind":"pith_short_8","alias_value":"X6KOWHDG","created_at":"2026-07-05T02:48:10Z"}],"graph_snapshots":[{"event_id":"sha256:fcc1f526f6cf9013168b177ce5f27b3a4970e36486cf56126df0f701048c3a33","target":"graph","created_at":"2026-07-05T02:48:10Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2101.06837/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we propose an energy-efficient radar beampattern design framework for a Millimeter Wave (mmWave) massive multi-input multi-output (mMIMO) system, equipped with a hybrid analog-digital (HAD) beamforming structure. Aiming to reduce the power consumption and hardware cost of the mMIMO system, we employ a machine learning approach to synthesize the probing beampattern based on a small number of RF chains and antennas. By leveraging a combination of softmax neural networks, the proposed solution is able to achieve a desirable beampattern with high accuracy.","authors_text":"Athina Petropulu, Christos Masouros, Fan Liu, Konstantinos Diamantaras, Zhaoyi Xu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-01-18T02:04:38Z","title":"Learning to Select for MIMO Radar based on Hybrid Analog-Digital Beamforming"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.06837","kind":"arxiv","version":2},"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":"sha256:7b5c9b1c9c33a4eeb64e23d5f5fe610c377d684b46a2f96e84dfe563c77fad98","target":"record","created_at":"2026-07-05T02:48:10Z","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":"bea30c552590839f9c569aa55ead03038eae2d98096b35cdf33551c6a908238e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-01-18T02:04:38Z","title_canon_sha256":"7aafd0940446efc95417a83ac76c30ef3f9415369a9c52d24d2c1ed6a2c46d9a"},"schema_version":"1.0","source":{"id":"2101.06837","kind":"arxiv","version":2}},"canonical_sha256":"bf94eb1c66f0e7fc45d513cd4344497cbe03c864ad55a5e120a4ec447e85270e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bf94eb1c66f0e7fc45d513cd4344497cbe03c864ad55a5e120a4ec447e85270e","first_computed_at":"2026-07-05T02:48:10.176667Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:48:10.176667Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LysnWbf6rV+o4gKMUJ7XWgGw4Nt2AcNIwwIDTrWQWOg3UXXKi1p18EXxRe62LOQmq3pQ8pjy78M0a9dMMNI1Aw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:48:10.177112Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.06837","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7b5c9b1c9c33a4eeb64e23d5f5fe610c377d684b46a2f96e84dfe563c77fad98","sha256:fcc1f526f6cf9013168b177ce5f27b3a4970e36486cf56126df0f701048c3a33"],"state_sha256":"7852ff95bb8fb827c30eaca42e4ca476b98a3a32f828ae5b7276084559bf27b8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rz7pKFq/B+wzaVWKlcUBeIAsO+WsztwX/mRMBMogyZnRRIeHzU0Lij2UmuPZ4uxGi4LeSDzUP7RBwuIwSJAhBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T06:17:02.568673Z","bundle_sha256":"0561d6516352b8b5a3ee8836f22644a7407128e232a170ca9a47b17d2f8ba5bb"}}