{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:7XFPUVSAJIZI5WH6L6ACR4HIO5","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":"81151a177b7a0d9fe64f38860abea142add6a398e9e95003ed3c55747f273376","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-07-17T12:09:06Z","title_canon_sha256":"b2b7cf68e56796b0bf9635aede755048bbb863d85e5234a6414387a3d5d4cb3f"},"schema_version":"1.0","source":{"id":"2507.13037","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.13037","created_at":"2026-07-05T11:38:53Z"},{"alias_kind":"arxiv_version","alias_value":"2507.13037v1","created_at":"2026-07-05T11:38:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.13037","created_at":"2026-07-05T11:38:53Z"},{"alias_kind":"pith_short_12","alias_value":"7XFPUVSAJIZI","created_at":"2026-07-05T11:38:53Z"},{"alias_kind":"pith_short_16","alias_value":"7XFPUVSAJIZI5WH6","created_at":"2026-07-05T11:38:53Z"},{"alias_kind":"pith_short_8","alias_value":"7XFPUVSA","created_at":"2026-07-05T11:38:53Z"}],"graph_snapshots":[{"event_id":"sha256:9804f94e42c38d04691988930a1ae44f37e2c06a1ead4dd8f665feddb81859a2","target":"graph","created_at":"2026-07-05T11:38:53Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2507.13037/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Affine frequency division multiplexing (AFDM), a promising multicarrier technique utilizing chirp signals, has been envisioned as an effective solution for high-mobility communication scenarios. In this paper, we develop a multiple-mode index modulation scheme tailored for AFDM, termed as MM-AFDM-IM, which aims to further improve the spectral and energy efficiencies of AFDM. Specifically, multiple constellation alphabets are selected for different chirp-based subcarriers (chirps). Aside from classical amplitude/phase modulation, additional information bits can be conveyed by the dynamic patter","authors_text":"Guangyao Liu, Jingjing Zhao, Tianqi Mao, Yanqun Tang, Zhenyu Xiao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-07-17T12:09:06Z","title":"Multiple-Mode Affine Frequency Division Multiplexing with Index Modulation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.13037","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:cc315a317808b08f26251e3314332bbf515ff3d7b717f96a0c85f79f704e7157","target":"record","created_at":"2026-07-05T11:38:53Z","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":"81151a177b7a0d9fe64f38860abea142add6a398e9e95003ed3c55747f273376","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-07-17T12:09:06Z","title_canon_sha256":"b2b7cf68e56796b0bf9635aede755048bbb863d85e5234a6414387a3d5d4cb3f"},"schema_version":"1.0","source":{"id":"2507.13037","kind":"arxiv","version":1}},"canonical_sha256":"fdcafa56404a328ed8fe5f8028f0e87754e85d2e2ca83bf1935f5005db328d1b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fdcafa56404a328ed8fe5f8028f0e87754e85d2e2ca83bf1935f5005db328d1b","first_computed_at":"2026-07-05T11:38:53.536551Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:38:53.536551Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fgMknJqgYZccvd60xDrLX8Cpf+3xu37eJYPjgiEIswGYbmQDSEIQeXmu2T1aguS8uqAmQm5uu5AwbsU8SKiVAw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:38:53.537042Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.13037","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc315a317808b08f26251e3314332bbf515ff3d7b717f96a0c85f79f704e7157","sha256:9804f94e42c38d04691988930a1ae44f37e2c06a1ead4dd8f665feddb81859a2"],"state_sha256":"b3dbb6a56ccf942b9fea45bafe4db9e1459695c7476b590ba6f26e6ae25845b9"}