{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:BAK6RCBS7IGACI7RU2EYDDX3RL","short_pith_number":"pith:BAK6RCBS","canonical_record":{"source":{"id":"1610.03514","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2016-10-11T20:19:41Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"3b8d08950b480058e7519ff1294dbf8cd418511135078b37751d3553838cb820","abstract_canon_sha256":"3975295d10b1f6ccc700d0eadb4bbcab78c7829c35e8b122b123bb8101d167e5"},"schema_version":"1.0"},"canonical_sha256":"0815e88832fa0c0123f1a689818efb8af564ef7f35c0fa3cc6e15df6eef2fda3","source":{"kind":"arxiv","id":"1610.03514","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.03514","created_at":"2026-05-18T01:02:30Z"},{"alias_kind":"arxiv_version","alias_value":"1610.03514v1","created_at":"2026-05-18T01:02:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.03514","created_at":"2026-05-18T01:02:30Z"},{"alias_kind":"pith_short_12","alias_value":"BAK6RCBS7IGA","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"BAK6RCBS7IGACI7R","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"BAK6RCBS","created_at":"2026-05-18T12:30:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:BAK6RCBS7IGACI7RU2EYDDX3RL","target":"record","payload":{"canonical_record":{"source":{"id":"1610.03514","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2016-10-11T20:19:41Z","cross_cats_sorted":["cs.IT","math.IT"],"title_canon_sha256":"3b8d08950b480058e7519ff1294dbf8cd418511135078b37751d3553838cb820","abstract_canon_sha256":"3975295d10b1f6ccc700d0eadb4bbcab78c7829c35e8b122b123bb8101d167e5"},"schema_version":"1.0"},"canonical_sha256":"0815e88832fa0c0123f1a689818efb8af564ef7f35c0fa3cc6e15df6eef2fda3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:02:30.123697Z","signature_b64":"bzk6zl4+ZimMFWEL5+S6g4belTBUxSIk1neS9Ab4JU2SmZ+J4QGlmpLTJ6WwCGFisJvbm0ect8IAi+cTu1DpCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0815e88832fa0c0123f1a689818efb8af564ef7f35c0fa3cc6e15df6eef2fda3","last_reissued_at":"2026-05-18T01:02:30.123078Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:02:30.123078Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.03514","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":"2026-05-18T01:02:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8Q9I+cAEdxElJL2kFvtqmKp5ge7qBt1fKKbEYZb1i0UQK+18PT/r6tKuh34X9A8pC1S5wfjnEQz+FptKSzCkBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:25:08.950142Z"},"content_sha256":"b50a865f0fa3b6d45c40d52dcecd30babfd43e91d48bcb78847067cbf8464e9f","schema_version":"1.0","event_id":"sha256:b50a865f0fa3b6d45c40d52dcecd30babfd43e91d48bcb78847067cbf8464e9f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:BAK6RCBS7IGACI7RU2EYDDX3RL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sparse Channel Estimation for Massive MIMO with 1-bit Feedback per Dimension","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.IT","math.IT"],"primary_cat":"cs.NI","authors_text":"Dongning Guo, Michael L. Honig, Xu Chen, Zhiyi Zhou","submitted_at":"2016-10-11T20:19:41Z","abstract_excerpt":"In massive multiple-input multiple-output (MIMO) systems, acquisition of the channel state information at the transmitter side (CSIT) is crucial. In this paper, a practical CSIT estimation scheme is proposed for frequency division duplexing (FDD) massive MIMO systems. Specifically, each received pilot symbol is first quantized to one bit per dimension at the receiver side and then the quantized bits are fed back to the transmitter. A joint one-bit compressed sensing algorithm is implemented at the transmitter to recover the channel matrices. The algorithm leverages the hidden joint sparsity st"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.03514","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":"2026-05-18T01:02:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DHqwikSSkKZ1w4SJLzyQni49NEvBrmwNPrJX28O1vTdtcmh8HyfYBMsrKGbhiM2/qZd33UmVacjr+Lwyf8JhAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:25:08.950536Z"},"content_sha256":"07a2de4b1d3337a4d7599983a62db1fe8bfffec0bf0236ce9e5c120c91152fd3","schema_version":"1.0","event_id":"sha256:07a2de4b1d3337a4d7599983a62db1fe8bfffec0bf0236ce9e5c120c91152fd3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BAK6RCBS7IGACI7RU2EYDDX3RL/bundle.json","state_url":"https://pith.science/pith/BAK6RCBS7IGACI7RU2EYDDX3RL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BAK6RCBS7IGACI7RU2EYDDX3RL/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":"2026-05-27T06:25:08Z","links":{"resolver":"https://pith.science/pith/BAK6RCBS7IGACI7RU2EYDDX3RL","bundle":"https://pith.science/pith/BAK6RCBS7IGACI7RU2EYDDX3RL/bundle.json","state":"https://pith.science/pith/BAK6RCBS7IGACI7RU2EYDDX3RL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BAK6RCBS7IGACI7RU2EYDDX3RL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:BAK6RCBS7IGACI7RU2EYDDX3RL","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":"3975295d10b1f6ccc700d0eadb4bbcab78c7829c35e8b122b123bb8101d167e5","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2016-10-11T20:19:41Z","title_canon_sha256":"3b8d08950b480058e7519ff1294dbf8cd418511135078b37751d3553838cb820"},"schema_version":"1.0","source":{"id":"1610.03514","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.03514","created_at":"2026-05-18T01:02:30Z"},{"alias_kind":"arxiv_version","alias_value":"1610.03514v1","created_at":"2026-05-18T01:02:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.03514","created_at":"2026-05-18T01:02:30Z"},{"alias_kind":"pith_short_12","alias_value":"BAK6RCBS7IGA","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"BAK6RCBS7IGACI7R","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"BAK6RCBS","created_at":"2026-05-18T12:30:07Z"}],"graph_snapshots":[{"event_id":"sha256:07a2de4b1d3337a4d7599983a62db1fe8bfffec0bf0236ce9e5c120c91152fd3","target":"graph","created_at":"2026-05-18T01:02:30Z","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 massive multiple-input multiple-output (MIMO) systems, acquisition of the channel state information at the transmitter side (CSIT) is crucial. In this paper, a practical CSIT estimation scheme is proposed for frequency division duplexing (FDD) massive MIMO systems. Specifically, each received pilot symbol is first quantized to one bit per dimension at the receiver side and then the quantized bits are fed back to the transmitter. A joint one-bit compressed sensing algorithm is implemented at the transmitter to recover the channel matrices. The algorithm leverages the hidden joint sparsity st","authors_text":"Dongning Guo, Michael L. Honig, Xu Chen, Zhiyi Zhou","cross_cats":["cs.IT","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2016-10-11T20:19:41Z","title":"Sparse Channel Estimation for Massive MIMO with 1-bit Feedback per Dimension"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.03514","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:b50a865f0fa3b6d45c40d52dcecd30babfd43e91d48bcb78847067cbf8464e9f","target":"record","created_at":"2026-05-18T01:02:30Z","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":"3975295d10b1f6ccc700d0eadb4bbcab78c7829c35e8b122b123bb8101d167e5","cross_cats_sorted":["cs.IT","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2016-10-11T20:19:41Z","title_canon_sha256":"3b8d08950b480058e7519ff1294dbf8cd418511135078b37751d3553838cb820"},"schema_version":"1.0","source":{"id":"1610.03514","kind":"arxiv","version":1}},"canonical_sha256":"0815e88832fa0c0123f1a689818efb8af564ef7f35c0fa3cc6e15df6eef2fda3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0815e88832fa0c0123f1a689818efb8af564ef7f35c0fa3cc6e15df6eef2fda3","first_computed_at":"2026-05-18T01:02:30.123078Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:02:30.123078Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bzk6zl4+ZimMFWEL5+S6g4belTBUxSIk1neS9Ab4JU2SmZ+J4QGlmpLTJ6WwCGFisJvbm0ect8IAi+cTu1DpCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:02:30.123697Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.03514","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b50a865f0fa3b6d45c40d52dcecd30babfd43e91d48bcb78847067cbf8464e9f","sha256:07a2de4b1d3337a4d7599983a62db1fe8bfffec0bf0236ce9e5c120c91152fd3"],"state_sha256":"31636796dc8002ee15390c9775ad0e112a7b855740c71edfffde934aa345f65f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IP3umffRvfbc/+st/O4QgDhFnJsMBOwHx/lmK9Ic/dc9LsP0LYk8i/NBcpa41n9Pb/q5FqyUJDPvy7dk/d5iBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T06:25:08.953749Z","bundle_sha256":"7197905676de3a25a754ff7182d12b2a9de0dc4d6b09af030d79661faef506e4"}}