Pith Number

pith:NO5MUA3L

pith:2026:NO5MUA3L42GPBAA3MJM2MYOK6G

not attested not anchored not stored refs pending

A Scalable 256-Antenna Distributed MIMO Testbed with Real-Time Fully Digital Beamforming

Anders J Johansson, Baktash Behmanesh, Dumitra Iancu, Emil Bergman, Liang Liu, Lina Tinnerberg, Mikael Henriksson, Ove Edfors, Sijia Cheng, Vilgot Snygg

A distributed MIMO testbed scales to 256 antennas using 16 RFSoC boards for real-time fully digital beamforming.

arxiv:2605.02388 v2 · 2026-05-04 · eess.SP · cs.SY · eess.SY

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\usepackage{pith}
\pithnumber{NO5MUA3L42GPBAA3MJM2MYOK6G}

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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.

Claims

C1strongest claim

The system is easily scalable, as increasing the number of antennas is done in multiples of 16 by adding more RFSoCs, which also implies addition of another processing node. The design allows up-scaling without hardware redesign, introduction of large latencies or data transfer overhead.

C2weakest assumption

That synchronization and coherence across distributed RFSoC nodes can be maintained at scale while keeping real-time performance and avoiding data-transfer bottlenecks when nodes are physically separated.

C3one line summary

The LuLIS testbed supports up to 256 antennas across 16 distributed RFSoC nodes with real-time FPGA-accelerated MIMO processing and demonstrates uplink operation from four single-antenna users at 64, 128, and 256 antennas.

Formal links

3 machine-checked theorem links

Receipt and verification

First computed	2026-05-27T01:05:56.072169Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6bbaca036be68cf0801b6259a661caf18f33f6bcae3a0a8881be756e79c47677

Aliases

arxiv: 2605.02388 · arxiv_version: 2605.02388v2 · doi: 10.48550/arxiv.2605.02388 · pith_short_12: NO5MUA3L42GP · pith_short_16: NO5MUA3L42GPBAA3 · pith_short_8: NO5MUA3L

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/NO5MUA3L42GPBAA3MJM2MYOK6G \
  | 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: 6bbaca036be68cf0801b6259a661caf18f33f6bcae3a0a8881be756e79c47677

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "74b60089d519b50a936f62cf3c89cae616834ebe2701c565d6e2d5dbb4307fc5",
    "cross_cats_sorted": [
      "cs.SY",
      "eess.SY"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "eess.SP",
    "submitted_at": "2026-05-04T09:32:16Z",
    "title_canon_sha256": "d70730b15846a47dc7291d9191852233f8628de826eac4c4a6b0b04e79228854"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.02388",
    "kind": "arxiv",
    "version": 2
  }
}