{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:PAYNG3HYA4VIDRNCNSXUGTSGFV","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":"59b8b8b27273d25ed2b61bcdf724e8fd68afe51c65120b945bf153919fcd2904","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-04-07T14:22:43Z","title_canon_sha256":"187fd1c40c30e89fea957b154a3e715c3666191627cf8c80878e18b4202b2020"},"schema_version":"1.0","source":{"id":"1704.02245","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1704.02245","created_at":"2026-05-18T00:46:46Z"},{"alias_kind":"arxiv_version","alias_value":"1704.02245v2","created_at":"2026-05-18T00:46:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.02245","created_at":"2026-05-18T00:46:46Z"},{"alias_kind":"pith_short_12","alias_value":"PAYNG3HYA4VI","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_16","alias_value":"PAYNG3HYA4VIDRNC","created_at":"2026-05-18T12:31:37Z"},{"alias_kind":"pith_short_8","alias_value":"PAYNG3HY","created_at":"2026-05-18T12:31:37Z"}],"graph_snapshots":[{"event_id":"sha256:ecc8a7a8c88f79a3364aa6c307d9f70ce4f764b04f5430942e4acfb35d5cf025","target":"graph","created_at":"2026-05-18T00:46:46Z","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":"Ambient backscatter communication (AmBC) enables radio-frequency (RF) powered backscatter devices (BDs) (e.g., sensors, tags) to modulate their information bits over ambient RF carriers in an over-the-air manner. This technology also called \"modulation in the air\", thus has emerged as a promising solution to achieve green communications for future Internet-of-Things. This paper studies an AmBC system by leveraging the ambient orthogonal frequency division multiplexing (OFDM) modulated signals in the air. We first model such AmBC system from a spread-spectrum communication perspective, upon whi","authors_text":"Gang Yang, Rui Zhang, Ying-Chang Liang, Yiyang Pei","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-04-07T14:22:43Z","title":"Modulation in the Air: Backscatter Communication over Ambient OFDM Carrier"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.02245","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":"sha256:043cd7dd8139f42690b27b63911d9d17396617bf00a3cc7297f262e4bbd6902e","target":"record","created_at":"2026-05-18T00:46:46Z","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":"59b8b8b27273d25ed2b61bcdf724e8fd68afe51c65120b945bf153919fcd2904","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-04-07T14:22:43Z","title_canon_sha256":"187fd1c40c30e89fea957b154a3e715c3666191627cf8c80878e18b4202b2020"},"schema_version":"1.0","source":{"id":"1704.02245","kind":"arxiv","version":2}},"canonical_sha256":"7830d36cf8072a81c5a26caf434e462d7eac5547d0f7904e20640967707d9943","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7830d36cf8072a81c5a26caf434e462d7eac5547d0f7904e20640967707d9943","first_computed_at":"2026-05-18T00:46:46.011658Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:46:46.011658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2raP4BTznRtCWo5JnWZ7WozPLqE+qppvco8UKpCZD9miVMQ5hia7Z4jnId+ONUG49wC3a4LW/ySwr/OMgUNqDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:46:46.012387Z","signed_message":"canonical_sha256_bytes"},"source_id":"1704.02245","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:043cd7dd8139f42690b27b63911d9d17396617bf00a3cc7297f262e4bbd6902e","sha256:ecc8a7a8c88f79a3364aa6c307d9f70ce4f764b04f5430942e4acfb35d5cf025"],"state_sha256":"67fc6b3948b76ddaeb7ee5ef817576839f63f4f60c66de0f8fd0087db3c33ea8"}