Pith Number

pith:R27ULDVG

pith:2017:R27ULDVG56SGQ7QUE42RTYEXBN

not attested not anchored not stored refs pending

Efficient Downlink Channel Probing and Uplink Feedback in FDD Massive MIMO Systems

Giuseppe Caire, Mahdi Barzegar Khalilsarai, Saeid Haghighatshoar

arxiv:1708.04444 v1 · 2017-08-15 · cs.IT · math.IT

Open paper page JSON Open Graph Bundle Merged state What is a Pith Number?

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T00:37:59.312913Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8ebf458ea6efa4687e14273519e0970b4f49525639ca8e2840546ab13c44d275

Aliases

arxiv: 1708.04444 · arxiv_version: 1708.04444v1 · doi: 10.48550/arxiv.1708.04444 · pith_short_12: R27ULDVG56SG · pith_short_16: R27ULDVG56SGQ7QU · pith_short_8: R27ULDVG

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/R27ULDVG56SGQ7QUE42RTYEXBN \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 8ebf458ea6efa4687e14273519e0970b4f49525639ca8e2840546ab13c44d275

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7e9a1adaf6d2cb24d3437b2bf7c21ef18bfc5093aaf8efe41033fcbb0809d828",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2017-08-15T09:23:05Z",
    "title_canon_sha256": "49aa404c02adfd3b9d4e9c095568cd8f16e1df32e828ec9ca01b33bf3cc91a00"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.04444",
    "kind": "arxiv",
    "version": 1
  }
}