{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:5TZKMIJ222V4WYWA5RQLBP7P6H","short_pith_number":"pith:5TZKMIJ2","canonical_record":{"source":{"id":"1804.10987","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-04-29T20:31:18Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"6f4485e657d2d357fa261e7ead2bfbe5adb08cb8ee94ff509245764696b91f4f","abstract_canon_sha256":"9c8e8751682d497908e329e30adb61a8162028643b41396fca6c2eea53362bbb"},"schema_version":"1.0"},"canonical_sha256":"ecf2a6213ad6abcb62c0ec60b0bfeff1ecf2e4efb3e4ae6fe0f2af54313ecb6a","source":{"kind":"arxiv","id":"1804.10987","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.10987","created_at":"2026-05-18T00:17:14Z"},{"alias_kind":"arxiv_version","alias_value":"1804.10987v1","created_at":"2026-05-18T00:17:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.10987","created_at":"2026-05-18T00:17:14Z"},{"alias_kind":"pith_short_12","alias_value":"5TZKMIJ222V4","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5TZKMIJ222V4WYWA","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5TZKMIJ2","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:5TZKMIJ222V4WYWA5RQLBP7P6H","target":"record","payload":{"canonical_record":{"source":{"id":"1804.10987","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-04-29T20:31:18Z","cross_cats_sorted":["eess.SP","math.IT"],"title_canon_sha256":"6f4485e657d2d357fa261e7ead2bfbe5adb08cb8ee94ff509245764696b91f4f","abstract_canon_sha256":"9c8e8751682d497908e329e30adb61a8162028643b41396fca6c2eea53362bbb"},"schema_version":"1.0"},"canonical_sha256":"ecf2a6213ad6abcb62c0ec60b0bfeff1ecf2e4efb3e4ae6fe0f2af54313ecb6a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:17:14.964564Z","signature_b64":"IB7hh7jE8W5mDPxe6ILRffAyWunI9nHkeasO0iqmNt1wzDCPSy5ND8Stbm3898zwnrhE7JVdBn2WtaG0LsnqAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ecf2a6213ad6abcb62c0ec60b0bfeff1ecf2e4efb3e4ae6fe0f2af54313ecb6a","last_reissued_at":"2026-05-18T00:17:14.964079Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:17:14.964079Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.10987","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":"2026-05-18T00:17:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+p+OgDeCebERjNJFnYTUQtvvHtMZDRIXqWOGgoYVhp3oqLk5A+206X49DWlZxnosaVFBJe/oF7wKL+KP07VuDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:52:01.465193Z"},"content_sha256":"8cd8667f8f454b39e5bc246ef9eb1d25967b453f7891dbb7953b3167466f82ba","schema_version":"1.0","event_id":"sha256:8cd8667f8f454b39e5bc246ef9eb1d25967b453f7891dbb7953b3167466f82ba"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:5TZKMIJ222V4WYWA5RQLBP7P6H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Feedforward Architectures for Decentralized Precoding in Massive MU-MIMO Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.SP","math.IT"],"primary_cat":"cs.IT","authors_text":"Charles Jeon, Christoph Studer, Joseph R. Cavallaro, Kaipeng Li","submitted_at":"2018-04-29T20:31:18Z","abstract_excerpt":"Massive multi-user multiple-input multiple-output (MU-MIMO) enables significant gains in spectral efficiency and link reliability compared to conventional small-scale MIMO technology. Furthermore, linear precoders, e.g., using zero forcing or Wiener filter (WF) precoding, are sufficient to achieve excellent error-rate performance in the massive MU-MIMO downlink. However, these methods necessitate centralized processing at the base-station (BS), which causes (i) excessively high interconnect and chip input/output data rates, and (ii) high implementation complexity. We propose two feedforward ar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10987","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":"2026-05-18T00:17:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EmBjPfIIsH8hw5FFRu4XK+ROZGt33CCqqazl+UlVCjl9chENG2ZxgsSksuiGNSagyUsNJvcycr4zuFZeRUV6CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:52:01.465883Z"},"content_sha256":"d06314e2b853641f7ad46962afdcf98ca396458c2dfc0d2001e45a4d003dc8ac","schema_version":"1.0","event_id":"sha256:d06314e2b853641f7ad46962afdcf98ca396458c2dfc0d2001e45a4d003dc8ac"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5TZKMIJ222V4WYWA5RQLBP7P6H/bundle.json","state_url":"https://pith.science/pith/5TZKMIJ222V4WYWA5RQLBP7P6H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5TZKMIJ222V4WYWA5RQLBP7P6H/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":"2026-05-27T19:52:01Z","links":{"resolver":"https://pith.science/pith/5TZKMIJ222V4WYWA5RQLBP7P6H","bundle":"https://pith.science/pith/5TZKMIJ222V4WYWA5RQLBP7P6H/bundle.json","state":"https://pith.science/pith/5TZKMIJ222V4WYWA5RQLBP7P6H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5TZKMIJ222V4WYWA5RQLBP7P6H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5TZKMIJ222V4WYWA5RQLBP7P6H","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":"9c8e8751682d497908e329e30adb61a8162028643b41396fca6c2eea53362bbb","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-04-29T20:31:18Z","title_canon_sha256":"6f4485e657d2d357fa261e7ead2bfbe5adb08cb8ee94ff509245764696b91f4f"},"schema_version":"1.0","source":{"id":"1804.10987","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.10987","created_at":"2026-05-18T00:17:14Z"},{"alias_kind":"arxiv_version","alias_value":"1804.10987v1","created_at":"2026-05-18T00:17:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.10987","created_at":"2026-05-18T00:17:14Z"},{"alias_kind":"pith_short_12","alias_value":"5TZKMIJ222V4","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5TZKMIJ222V4WYWA","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5TZKMIJ2","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:d06314e2b853641f7ad46962afdcf98ca396458c2dfc0d2001e45a4d003dc8ac","target":"graph","created_at":"2026-05-18T00:17:14Z","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":"Massive multi-user multiple-input multiple-output (MU-MIMO) enables significant gains in spectral efficiency and link reliability compared to conventional small-scale MIMO technology. Furthermore, linear precoders, e.g., using zero forcing or Wiener filter (WF) precoding, are sufficient to achieve excellent error-rate performance in the massive MU-MIMO downlink. However, these methods necessitate centralized processing at the base-station (BS), which causes (i) excessively high interconnect and chip input/output data rates, and (ii) high implementation complexity. We propose two feedforward ar","authors_text":"Charles Jeon, Christoph Studer, Joseph R. Cavallaro, Kaipeng Li","cross_cats":["eess.SP","math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-04-29T20:31:18Z","title":"Feedforward Architectures for Decentralized Precoding in Massive MU-MIMO Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10987","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":"sha256:8cd8667f8f454b39e5bc246ef9eb1d25967b453f7891dbb7953b3167466f82ba","target":"record","created_at":"2026-05-18T00:17:14Z","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":"9c8e8751682d497908e329e30adb61a8162028643b41396fca6c2eea53362bbb","cross_cats_sorted":["eess.SP","math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2018-04-29T20:31:18Z","title_canon_sha256":"6f4485e657d2d357fa261e7ead2bfbe5adb08cb8ee94ff509245764696b91f4f"},"schema_version":"1.0","source":{"id":"1804.10987","kind":"arxiv","version":1}},"canonical_sha256":"ecf2a6213ad6abcb62c0ec60b0bfeff1ecf2e4efb3e4ae6fe0f2af54313ecb6a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ecf2a6213ad6abcb62c0ec60b0bfeff1ecf2e4efb3e4ae6fe0f2af54313ecb6a","first_computed_at":"2026-05-18T00:17:14.964079Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:17:14.964079Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IB7hh7jE8W5mDPxe6ILRffAyWunI9nHkeasO0iqmNt1wzDCPSy5ND8Stbm3898zwnrhE7JVdBn2WtaG0LsnqAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:17:14.964564Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.10987","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8cd8667f8f454b39e5bc246ef9eb1d25967b453f7891dbb7953b3167466f82ba","sha256:d06314e2b853641f7ad46962afdcf98ca396458c2dfc0d2001e45a4d003dc8ac"],"state_sha256":"771e9b665bc2d9f32cba0afc13eab44a097553b018c84e741082bdd3c71c1ac4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yrFKS+GgMX71eeSwZhuNOU5LSP75gt423rROeJGZBdIpvFMQV5r5nC/lAGo23c0oV++1n50l9h4a8LFqdUJIBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T19:52:01.469390Z","bundle_sha256":"0d76a5fa24ea3fa9268ac4a0c21bef601aeee82a9b1606d116a08652a8c5e86a"}}