Pith Number

pith:FZTTXV74

pith:2019:FZTTXV7422X6RCI5Q4JH6WDDDC

not attested not anchored not stored refs pending

Uplink-Downlink Channel Covariance Transformations and Precoding Design for FDD Massive MIMO

Giuseppe Caire, Mahdi Barzegar Khalilsarai, Saeid Haghighatshoar, Tianyu Yang, Yi Song

arxiv:1912.02455 v1 · 2019-12-05 · cs.IT · eess.SP · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FZTTXV7422X6RCI5Q4JH6WDDDC}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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	2026-07-05T00:24:28.621994Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2e673bd7fcd6afe8891d87127f586318a9a7c5d839c93b7ba414d453b16debdb

Aliases

arxiv: 1912.02455 · arxiv_version: 1912.02455v1 · doi: 10.48550/arxiv.1912.02455 · pith_short_12: FZTTXV7422X6 · pith_short_16: FZTTXV7422X6RCI5 · pith_short_8: FZTTXV74

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/FZTTXV7422X6RCI5Q4JH6WDDDC \
  | 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: 2e673bd7fcd6afe8891d87127f586318a9a7c5d839c93b7ba414d453b16debdb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "227526f4800492c31967ad55c53a82ab878223fb9fca2ae52ed9e9a7f3e95200",
    "cross_cats_sorted": [
      "eess.SP",
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2019-12-05T09:26:45Z",
    "title_canon_sha256": "0079308a9b0da15624b748d15981cb2f0d5dca0f84a0b7515917a0b04561bcdd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1912.02455",
    "kind": "arxiv",
    "version": 1
  }
}