{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:AUFW5EGXCSGC7KC3DVBYMOPKMI","short_pith_number":"pith:AUFW5EGX","canonical_record":{"source":{"id":"1111.1191","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-11-04T17:20:15Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"62821bd4a043c9d9e8b311bff318b733471d00af0314f60dc5b609f8d9b7339e","abstract_canon_sha256":"44b520baadcae01139061e1a831b8a998d7f6a0effdcffcd3651a4b346565113"},"schema_version":"1.0"},"canonical_sha256":"050b6e90d7148c2fa85b1d438639ea6229b572a80d936e5bdc3cdf0e851b4949","source":{"kind":"arxiv","id":"1111.1191","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1191","created_at":"2026-05-18T04:09:35Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1191v1","created_at":"2026-05-18T04:09:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1191","created_at":"2026-05-18T04:09:35Z"},{"alias_kind":"pith_short_12","alias_value":"AUFW5EGXCSGC","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"AUFW5EGXCSGC7KC3","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"AUFW5EGX","created_at":"2026-05-18T12:26:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:AUFW5EGXCSGC7KC3DVBYMOPKMI","target":"record","payload":{"canonical_record":{"source":{"id":"1111.1191","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-11-04T17:20:15Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"62821bd4a043c9d9e8b311bff318b733471d00af0314f60dc5b609f8d9b7339e","abstract_canon_sha256":"44b520baadcae01139061e1a831b8a998d7f6a0effdcffcd3651a4b346565113"},"schema_version":"1.0"},"canonical_sha256":"050b6e90d7148c2fa85b1d438639ea6229b572a80d936e5bdc3cdf0e851b4949","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:09:35.553248Z","signature_b64":"G8W/HyTuYK+grw/XZ0sai5ZywgwPrHSwbu9WQzDjzTuiMRLZLQP707UNISOOF6/JBl7OPYnhuWNeZQvOaC/NDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"050b6e90d7148c2fa85b1d438639ea6229b572a80d936e5bdc3cdf0e851b4949","last_reissued_at":"2026-05-18T04:09:35.552721Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:09:35.552721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1111.1191","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":"2026-05-18T04:09:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2YWBlLQI7dfmGV8PFGVmG5Xtf1nt/ft+2QCtoasKNBspV+SYC1dk7xx1P6V0WcHtakt4dl0mItOX3/sPqZjAAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T23:13:50.412551Z"},"content_sha256":"ec34b984fb2a8cccd429a0ad5d8fbc2ddc578279806aafbb0c4594f18d4137c0","schema_version":"1.0","event_id":"sha256:ec34b984fb2a8cccd429a0ad5d8fbc2ddc578279806aafbb0c4594f18d4137c0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:AUFW5EGXCSGC7KC3DVBYMOPKMI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constant Envelope Precoding for Power-Efficient Downlink Wireless Communication in Multi-User MIMO Systems Using Large Antenna Arrays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Erik G. Larsson, Saif Khan Mohammed","submitted_at":"2011-11-04T17:20:15Z","abstract_excerpt":"We consider downlink cellular multi-user communication between a base station (BS) having N antennas and M single-antenna users, i.e., an N X M Gaussian Broadcast Channel (GBC). Under an average only total transmit power constraint (APC), large antenna arrays at the BS (having tens to a few hundred antennas) have been recently shown to achieve remarkable multi-user interference (MUI) suppression with simple precoding techniques. However, building large arrays in practice, would require cheap/power-efficient Radio-Frequency(RF) electronic components. The type of transmitted signal that facilita"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1191","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":"2026-05-18T04:09:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P54s6LiyM42c9hNateV0exE5Ofqr+pMBaxK96fr2hNIDKwKhezMViVfoaRtzqV1cJIo6//L+Y9VNgUlc70/tBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T23:13:50.412888Z"},"content_sha256":"5e1a4074726b1fe4f9110afbb6219ad86831bb951218bc13854fa774f537eeec","schema_version":"1.0","event_id":"sha256:5e1a4074726b1fe4f9110afbb6219ad86831bb951218bc13854fa774f537eeec"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI/bundle.json","state_url":"https://pith.science/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI/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":"2026-06-28T23:13:50Z","links":{"resolver":"https://pith.science/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI","bundle":"https://pith.science/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI/bundle.json","state":"https://pith.science/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AUFW5EGXCSGC7KC3DVBYMOPKMI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:AUFW5EGXCSGC7KC3DVBYMOPKMI","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":"44b520baadcae01139061e1a831b8a998d7f6a0effdcffcd3651a4b346565113","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-11-04T17:20:15Z","title_canon_sha256":"62821bd4a043c9d9e8b311bff318b733471d00af0314f60dc5b609f8d9b7339e"},"schema_version":"1.0","source":{"id":"1111.1191","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1191","created_at":"2026-05-18T04:09:35Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1191v1","created_at":"2026-05-18T04:09:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1191","created_at":"2026-05-18T04:09:35Z"},{"alias_kind":"pith_short_12","alias_value":"AUFW5EGXCSGC","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"AUFW5EGXCSGC7KC3","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"AUFW5EGX","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:5e1a4074726b1fe4f9110afbb6219ad86831bb951218bc13854fa774f537eeec","target":"graph","created_at":"2026-05-18T04:09:35Z","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":"We consider downlink cellular multi-user communication between a base station (BS) having N antennas and M single-antenna users, i.e., an N X M Gaussian Broadcast Channel (GBC). Under an average only total transmit power constraint (APC), large antenna arrays at the BS (having tens to a few hundred antennas) have been recently shown to achieve remarkable multi-user interference (MUI) suppression with simple precoding techniques. However, building large arrays in practice, would require cheap/power-efficient Radio-Frequency(RF) electronic components. The type of transmitted signal that facilita","authors_text":"Erik G. Larsson, Saif Khan Mohammed","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-11-04T17:20:15Z","title":"Constant Envelope Precoding for Power-Efficient Downlink Wireless Communication in Multi-User MIMO Systems Using Large Antenna Arrays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1191","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:ec34b984fb2a8cccd429a0ad5d8fbc2ddc578279806aafbb0c4594f18d4137c0","target":"record","created_at":"2026-05-18T04:09:35Z","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":"44b520baadcae01139061e1a831b8a998d7f6a0effdcffcd3651a4b346565113","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-11-04T17:20:15Z","title_canon_sha256":"62821bd4a043c9d9e8b311bff318b733471d00af0314f60dc5b609f8d9b7339e"},"schema_version":"1.0","source":{"id":"1111.1191","kind":"arxiv","version":1}},"canonical_sha256":"050b6e90d7148c2fa85b1d438639ea6229b572a80d936e5bdc3cdf0e851b4949","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"050b6e90d7148c2fa85b1d438639ea6229b572a80d936e5bdc3cdf0e851b4949","first_computed_at":"2026-05-18T04:09:35.552721Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:09:35.552721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G8W/HyTuYK+grw/XZ0sai5ZywgwPrHSwbu9WQzDjzTuiMRLZLQP707UNISOOF6/JBl7OPYnhuWNeZQvOaC/NDw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:09:35.553248Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.1191","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ec34b984fb2a8cccd429a0ad5d8fbc2ddc578279806aafbb0c4594f18d4137c0","sha256:5e1a4074726b1fe4f9110afbb6219ad86831bb951218bc13854fa774f537eeec"],"state_sha256":"32c81b18cb2143142e14e83b30d701a58946228762d7f71b6537312e3dacf048"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zLAoWngpaMauC/oAasNFNDYXjPIChinD7BuihBIh4M1uloeyVuIqWGPg5WG8a/xkiZR6eIFbju7C/WhovDi6BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T23:13:50.414686Z","bundle_sha256":"4980c9b5b9e9b9d6b7df6c395c33cf4d53258d6d8bf1a13969d4649599842464"}}