{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:T2HFM2DWZ6SZS7R3H5E2SGF6NN","short_pith_number":"pith:T2HFM2DW","canonical_record":{"source":{"id":"1711.03477","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-11-09T17:18:50Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"632d10966659d7a2e136d738b0c29eb7729c05cc75b9b4078964b7ac2a760f73","abstract_canon_sha256":"f8f9147d9223a89476d577c55c1d1f2aeab30d4ebedb933a4a83a4539898808b"},"schema_version":"1.0"},"canonical_sha256":"9e8e566876cfa5997e3b3f49a918be6b650ad2c44551a5da71ddbb3c7b651d70","source":{"kind":"arxiv","id":"1711.03477","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.03477","created_at":"2026-05-18T00:22:49Z"},{"alias_kind":"arxiv_version","alias_value":"1711.03477v2","created_at":"2026-05-18T00:22:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.03477","created_at":"2026-05-18T00:22:49Z"},{"alias_kind":"pith_short_12","alias_value":"T2HFM2DWZ6SZ","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_16","alias_value":"T2HFM2DWZ6SZS7R3","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_8","alias_value":"T2HFM2DW","created_at":"2026-05-18T12:31:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:T2HFM2DWZ6SZS7R3H5E2SGF6NN","target":"record","payload":{"canonical_record":{"source":{"id":"1711.03477","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-11-09T17:18:50Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"632d10966659d7a2e136d738b0c29eb7729c05cc75b9b4078964b7ac2a760f73","abstract_canon_sha256":"f8f9147d9223a89476d577c55c1d1f2aeab30d4ebedb933a4a83a4539898808b"},"schema_version":"1.0"},"canonical_sha256":"9e8e566876cfa5997e3b3f49a918be6b650ad2c44551a5da71ddbb3c7b651d70","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:49.149249Z","signature_b64":"KZVOJjZAIxloBiCu7lOdvIQt5Qf0dkjoVsIpjn54fiaLaVuDMrNJjiHnH8xMWaZy+BZWj0/c4/sOvr/eUnOyCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9e8e566876cfa5997e3b3f49a918be6b650ad2c44551a5da71ddbb3c7b651d70","last_reissued_at":"2026-05-18T00:22:49.148563Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:49.148563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1711.03477","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":"2026-05-18T00:22:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xJI65z7IwxpR0FnL83LuMyFIaHz1BSWcU+M0ScbZEp+TF8vc16DECXKI8A6EtyRV/cuySzbRbusxyDfgxpRrDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:05:03.561493Z"},"content_sha256":"7be5de81012427a49c6dac2a700eb7493485b2369dda19175fe460fd98a2c7f4","schema_version":"1.0","event_id":"sha256:7be5de81012427a49c6dac2a700eb7493485b2369dda19175fe460fd98a2c7f4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:T2HFM2DWZ6SZS7R3H5E2SGF6NN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Achievable Rates and Training Overheads for a Measured LOS Massive MIMO Channel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Fredrik Tufvesson, Liang Liu, Mark Beach, Ove Edfors, Paul Harris, Simon Armour, Steffen Malkowsky, Wael Boukley Hasan","submitted_at":"2017-11-09T17:18:50Z","abstract_excerpt":"This paper presents achievable uplink (UL) sumrate predictions for a measured line-of-sight (LOS) massive multiple-input, multiple-output (MIMO) (MMIMO) scenario and illustrates the trade-off between spatial multiplexing performance and channel de-coherence rate for an increasing number of base station (BS) antennas. In addition, an orthogonal frequency division multiplexing (OFDM) case study is formed which considers the 90% coherence time to evaluate the impact of MMIMO channel training overheads in high-speed LOS scenarios. It is shown that whilst 25% of the achievable zero-forcing (ZF) sum"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.03477","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":""},"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":"2026-05-18T00:22:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bn6ypQ/PldCS2Z5QW5SSzNJ8huROlZAX0hSZBORFVQFRLWDYbExhJXnVwpdLkbSvh6p7i31jpjIoVdAF0SV4Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:05:03.562161Z"},"content_sha256":"0e5a7b1a89a0408a0b22cd5be43abeae90966bff2bad47dd373d9a92ec37873c","schema_version":"1.0","event_id":"sha256:0e5a7b1a89a0408a0b22cd5be43abeae90966bff2bad47dd373d9a92ec37873c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN/bundle.json","state_url":"https://pith.science/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN/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":"2026-05-30T09:05:03Z","links":{"resolver":"https://pith.science/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN","bundle":"https://pith.science/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN/bundle.json","state":"https://pith.science/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T2HFM2DWZ6SZS7R3H5E2SGF6NN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:T2HFM2DWZ6SZS7R3H5E2SGF6NN","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":"f8f9147d9223a89476d577c55c1d1f2aeab30d4ebedb933a4a83a4539898808b","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-11-09T17:18:50Z","title_canon_sha256":"632d10966659d7a2e136d738b0c29eb7729c05cc75b9b4078964b7ac2a760f73"},"schema_version":"1.0","source":{"id":"1711.03477","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.03477","created_at":"2026-05-18T00:22:49Z"},{"alias_kind":"arxiv_version","alias_value":"1711.03477v2","created_at":"2026-05-18T00:22:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.03477","created_at":"2026-05-18T00:22:49Z"},{"alias_kind":"pith_short_12","alias_value":"T2HFM2DWZ6SZ","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_16","alias_value":"T2HFM2DWZ6SZS7R3","created_at":"2026-05-18T12:31:43Z"},{"alias_kind":"pith_short_8","alias_value":"T2HFM2DW","created_at":"2026-05-18T12:31:43Z"}],"graph_snapshots":[{"event_id":"sha256:0e5a7b1a89a0408a0b22cd5be43abeae90966bff2bad47dd373d9a92ec37873c","target":"graph","created_at":"2026-05-18T00:22:49Z","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":"This paper presents achievable uplink (UL) sumrate predictions for a measured line-of-sight (LOS) massive multiple-input, multiple-output (MIMO) (MMIMO) scenario and illustrates the trade-off between spatial multiplexing performance and channel de-coherence rate for an increasing number of base station (BS) antennas. In addition, an orthogonal frequency division multiplexing (OFDM) case study is formed which considers the 90% coherence time to evaluate the impact of MMIMO channel training overheads in high-speed LOS scenarios. It is shown that whilst 25% of the achievable zero-forcing (ZF) sum","authors_text":"Fredrik Tufvesson, Liang Liu, Mark Beach, Ove Edfors, Paul Harris, Simon Armour, Steffen Malkowsky, Wael Boukley Hasan","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-11-09T17:18:50Z","title":"Achievable Rates and Training Overheads for a Measured LOS Massive MIMO Channel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.03477","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":"sha256:7be5de81012427a49c6dac2a700eb7493485b2369dda19175fe460fd98a2c7f4","target":"record","created_at":"2026-05-18T00:22:49Z","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":"f8f9147d9223a89476d577c55c1d1f2aeab30d4ebedb933a4a83a4539898808b","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-11-09T17:18:50Z","title_canon_sha256":"632d10966659d7a2e136d738b0c29eb7729c05cc75b9b4078964b7ac2a760f73"},"schema_version":"1.0","source":{"id":"1711.03477","kind":"arxiv","version":2}},"canonical_sha256":"9e8e566876cfa5997e3b3f49a918be6b650ad2c44551a5da71ddbb3c7b651d70","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9e8e566876cfa5997e3b3f49a918be6b650ad2c44551a5da71ddbb3c7b651d70","first_computed_at":"2026-05-18T00:22:49.148563Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:49.148563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KZVOJjZAIxloBiCu7lOdvIQt5Qf0dkjoVsIpjn54fiaLaVuDMrNJjiHnH8xMWaZy+BZWj0/c4/sOvr/eUnOyCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:49.149249Z","signed_message":"canonical_sha256_bytes"},"source_id":"1711.03477","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7be5de81012427a49c6dac2a700eb7493485b2369dda19175fe460fd98a2c7f4","sha256:0e5a7b1a89a0408a0b22cd5be43abeae90966bff2bad47dd373d9a92ec37873c"],"state_sha256":"a6c45245029f44e23c573701a8ac8ed49624bd0bbe2f80240d1877ef3962ca2a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CiLBywuSBRiHLApxqYa3vzgBZooyFAfZTB8sa12RjB7CNiW6laFWF6QOQOF1aY4Sh52qxVUbn7JdUR8eJWelBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T09:05:03.565506Z","bundle_sha256":"b6849b1f719e699ba798f86003ab1a4d44c33a27abd237e853f73f795b4023a9"}}