Pith Number

pith:SMH45P5Q

pith:2019:SMH45P5Q2HOFA2V32657JMA5Y3

not attested not anchored not stored refs pending

Downlink Pilot Precoding and Compressed Channel Feedback for FDD-Based Cell-Free Systems

Byonghyo Shim, Jun Won Choi, Seungnyun Kim

arxiv:1909.07117 v1 · 2019-09-16 · cs.IT · 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{SMH45P5Q2HOFA2V32657JMA5Y3}

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	2026-07-05T00:04:53.217555Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

930fcebfb0d1dc506abbd7bbf4b01dc6ca43dc101ce87ea7419eb3f55a32d64b

Aliases

arxiv: 1909.07117 · arxiv_version: 1909.07117v1 · doi: 10.48550/arxiv.1909.07117 · pith_short_12: SMH45P5Q2HOF · pith_short_16: SMH45P5Q2HOFA2V3 · pith_short_8: SMH45P5Q

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/SMH45P5Q2HOFA2V32657JMA5Y3 \
  | 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: 930fcebfb0d1dc506abbd7bbf4b01dc6ca43dc101ce87ea7419eb3f55a32d64b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7e68927dbc694f80237f70678ecb97316b06005a315cb7e908d90bc4d31ac04d",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2019-09-16T10:57:59Z",
    "title_canon_sha256": "146fff4eb78ca2f9ae336e0baade72b9b00a052a9509d0b57c3d0ec180dd7f34"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.07117",
    "kind": "arxiv",
    "version": 1
  }
}