Pith Number

pith:BAM3DFHU

pith:2018:BAM3DFHUGEKOAULKX6CVUUGD34

not attested not anchored not stored refs pending

FDD Massive MIMO via UL/DL Channel Covariance Extrapolation and Active Channel Sparsification

Giuseppe Caire, Mahdi Barzegar Khalilsarai, Saeid Haghighatshoar, Xinping Yi

arxiv:1803.05754 v2 · 2018-03-15 · 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	2026-05-18T00:07:21.871833Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0819b194f43114e0516abf855a50c3df2b6ad9b500d340eb40aff563cc88944b

Aliases

arxiv: 1803.05754 · arxiv_version: 1803.05754v2 · doi: 10.48550/arxiv.1803.05754 · pith_short_12: BAM3DFHUGEKO · pith_short_16: BAM3DFHUGEKOAULK · pith_short_8: BAM3DFHU

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/BAM3DFHUGEKOAULKX6CVUUGD34 \
  | 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: 0819b194f43114e0516abf855a50c3df2b6ad9b500d340eb40aff563cc88944b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a98f3d52ffa9ba8396e4402596bd18fffe5f030e98a1044301b84f6100445167",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2018-03-15T14:08:35Z",
    "title_canon_sha256": "dd1bfe83318be15145097586e3ed85f9ea607b433ad6a7ce3e76dc1d54042423"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.05754",
    "kind": "arxiv",
    "version": 2
  }
}