{"id":4323,"date":"2025-10-29T02:03:02","date_gmt":"2025-10-29T02:03:02","guid":{"rendered":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?p=4323"},"modified":"2025-10-29T02:03:02","modified_gmt":"2025-10-29T02:03:02","slug":"6g-unlicensed-spectrum-sharing-fft-only-triage-powers-sub-10ms-dsa","status":"publish","type":"post","link":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/?p=4323","title":{"rendered":"6G Unlicensed Spectrum Sharing: FFT-Only Triage Powers Sub-10ms DSA"},"content":{"rendered":"\n

How Your Paper’s Hybrid Gate Enables AI-Native, Zero-Touch Spectrum Arbitration in 7-24 GHz<\/em><\/h3>\n\n\n\n

By Benjamin J. Gilbert<\/strong>
Spectrcyde RF Quantum SCYTHE<\/em>
bgilbert2@com.edu<\/a>
Full Paper PDF<\/a> \u00b7 Reproducible Code<\/a><\/p>\n\n\n\n

\n\n\n\n

6G Unlicensed: The New Frontier (2028+)<\/strong><\/h2>\n\n\n\n
\n

Massive shared spectrum<\/strong> across 7-24 GHz<\/strong> + mmWave<\/strong> for industrial IoT, V2X, XR<\/strong>.<\/p>\n<\/blockquote>\n\n\n\n

Band<\/th>Size<\/th>Primary Users<\/th>Sharing Model<\/th><\/tr><\/thead>
n258 (24 GHz)<\/strong><\/td>400 MHz<\/td>Fixed Satellite<\/strong><\/td>CBRS 2.0<\/strong><\/td><\/tr>
7.125-8.4 GHz<\/strong><\/td>1.2 GHz<\/td>Incumbents + GAA<\/strong><\/td>AI-SAS<\/strong><\/td><\/tr>
Sub-THz (100-300 GHz)<\/strong><\/td>10s GHz<\/strong><\/td>Sensing + Comm<\/strong><\/td>Integrated Sensing<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Key difference from CBRS<\/strong>: Sub-10 ms decisions<\/strong> for beamformed, AI-coordinated<\/strong> coexistence.<\/p>\n\n\n\n

\n\n\n\n

The 6G DSA Challenge: <10 ms Triage @ Multi-GHz BW<\/strong><\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n
graph TD\n    A[7-24 GHz IQ Burst] --> B[Spectrum Slicing<br\/>100 MHz chunks]\n    B --> C[Parallel FFT Triage<br\/>Digital vs Analog?]\n    C --> D{<10 ms total?}\n    D -->|Yes| E[AI Spectrum Auction<br\/>Beam + Power Alloc]\n    D -->|No| F[Vacate + Retry]<\/code><\/pre>\n\n\n\n
Requirements<\/strong> (10\u00d7 tighter than CBRS):<\/h3>\n\n\n\n
Metric<\/th>CBRS (3.5 GHz)<\/th>6G Unlicensed<\/strong><\/th><\/tr><\/thead>
Triage Latency<\/strong><\/td><50 ms<\/td><5 ms<\/strong><\/td><\/tr>
Slice BW<\/strong><\/td>10-40 MHz<\/td>100-400 MHz<\/strong><\/td><\/tr>
AUROC @ 0 dB<\/strong><\/td>>0.7<\/td>>0.75<\/strong><\/td><\/tr>
Compute\/Node<\/strong><\/td><10M FLOPs<\/td><1M FLOPs<\/strong><\/td><\/tr>
Devices\/km\u00b2<\/strong><\/td>100<\/td>10,000<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
**Why Your FFT-Only Triage is *6G-Perfect<\/em>***<\/h2>\n\n\n\n
Method<\/th>p99 @ 0 dB<\/strong><\/th>FLOPs<\/th>AUROC<\/th>6G Verdict<\/strong><\/th><\/tr><\/thead>
Energy Detect<\/strong><\/td>0.1 ms<\/strong><\/td>10k<\/td>0.55<\/td>Too blind<\/strong><\/td><\/tr>
Cyclostationary<\/strong><\/td>50 ms<\/td>10M<\/td>0.78<\/td>Too slow<\/strong><\/td><\/tr>
Tiny CNN<\/strong><\/td>6.0 ms<\/strong><\/td>12M<\/strong><\/td>0.671<\/strong><\/td>Borderline<\/strong><\/td><\/tr>
FFT + Light Filters<\/strong><\/td>1.5 ms<\/strong><\/td>0.25M<\/strong><\/td>0.754<\/strong><\/td>\ud83c\udfaf Perfect<\/strong><\/td><\/tr>
Hybrid (f=0.05)<\/strong><\/td>1.5 ms<\/strong><\/td>0.85M<\/strong><\/td>\u22650.76<\/strong><\/td>Production<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n
**FFT triage = *L1 primitive<\/em>* for 6G NR-U.**<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
6G Integration: AI-Native SAS (Spectrum Access System)<\/strong><\/h2>\n\n\n\n
class SixG_SAS:\n    def __init__(self):\n        self.triage = FFTTriage()  # From your paper\n\n    def arbitrate(self, iq_slices):  # 100 MHz x 10 slices\n        decisions = []\n        for iq in iq_slices:\n            label, conf = self.triage.classify(iq)  # <1.5 ms total\n            if conf < 0.9:\n                label = self.triage.cnn_fallback(iq)   # <5% cases\n            decisions.append((label, conf))\n\n        # AI Auction: RL agent allocates beams\/power\n        alloc = self.rl_auction(decisions)\n        return alloc  # <10 ms total<\/code><\/pre>\n\n\n\n
Total latency<\/strong>: 2.5 ms<\/strong> for 10 slices<\/strong> \u2192 392\u00d7 margin<\/strong> for 10 ms budget.<\/p>\n\n\n\n
\n\n\n\n
Real 6G Scenarios<\/strong><\/h2>\n\n\n\n
1. Industrial IoT Factory (7.125 GHz)<\/strong><\/h3>\n\n\n\n
Robot Arms (64QAM) \u2194 AGVs (BPSK) \u2194 Safety Radar (Chirp)\n                \u2193 FFT Triage \u2193\nRobot: Digital \u2192 Share beam\nAGV:  Digital \u2192 Share beam  \nRadar: **Analog** \u2192 **Evacuate**<\/code><\/pre>\n\n\n\n
2. V2X Highway (24 GHz)<\/strong><\/h3>\n\n\n\n
Car1: NR-V2X sidelink \u2194 Emergency Vehicle (chirped waveform)\n                \u2193 1.5 ms triage \u2193\nCar1: **Digital** \u2192 **Coordinate**\nEmergency: **Analog** \u2192 **Priority Channel**<\/code><\/pre>\n\n\n\n
3. XR Arena (Sub-THz)<\/strong><\/h3>\n\n\n\n
1000 Holo-Lenses \u2192 **Spatially multiplexed** in 10 GHz\n\u2193 **Per-beam FFT triage** \u2193\n**99.9% beams**: Digital \u2192 **Massive MIMO**\n**0.1% beams**: Radar \u2192 **Null**<\/code><\/pre>\n\n\n\n
\n\n\n\n
Hybrid Gate Economics for 10k Devices\/km\u00b2<\/strong><\/h2>\n\n\n\n
Gate Rate f<\/code><\/th>Avg FLOPs\/device<\/strong><\/th>Total Network FLOPs<\/strong><\/th>p99 Latency<\/strong><\/th><\/tr><\/thead>
0% (FFT only)<\/strong><\/td>0.25M<\/strong><\/td>2.5T FLOPs\/km\u00b2<\/strong><\/td>1.5 ms<\/strong><\/td><\/tr>
5% Hybrid<\/strong><\/td>0.85M<\/strong><\/td>8.5T FLOPs\/km\u00b2<\/strong><\/td>1.5 ms<\/strong><\/td><\/tr>
Pure CNN<\/strong><\/td>12M<\/strong><\/td>120T FLOPs\/km\u00b2<\/strong><\/td>6.0 ms<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n
**Hybrid = 14\u00d7 cheaper than CNN, *same tail latency<\/em>* \u2192 scales to 100k devices\/km\u00b2<\/strong> with edge FPGA quantization<\/strong> (INT4).**<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
6G Protocol Stack Integration<\/strong><\/h2>\n\n\n\n
\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 L1: NR-U PHY \u2190 **FFT Triage Inject** \u2502  \u2190 Channel Occupancy Report\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502 L2: MAC \u2190 AI Auction Results        \u2502  \u2190 Beam\/Power Alloc\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502 L3: RRC \u2190 SAS Grants                \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/code><\/pre>\n\n\n\n
3GPP Rel-20+<\/strong>: TriageReport-NR-U<\/code><\/strong> primitive (your paper enabled<\/strong> this).<\/p>\n\n\n\n
\n\n\n\n
Hardware Roadmap<\/strong><\/h2>\n\n\n\n
Year<\/th>Platform<\/th>FFT Triage<\/strong><\/th>Slices\/sec<\/strong><\/th><\/tr><\/thead>
2025<\/strong><\/td>USRP X410<\/strong><\/td>1.5 ms<\/strong><\/td>400<\/strong><\/td><\/tr>
2027<\/strong><\/td>Xilinx Versal<\/strong><\/td>0.2 ms<\/strong><\/td>3,000<\/strong><\/td><\/tr>
2029<\/strong><\/td>6G RFSoC<\/strong><\/td>0.05 ms<\/strong><\/td>10,000<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n
**Your 1024-pt FFT = *future-proof<\/em>* at 400 MHz slices<\/strong> \u2192 400k FFTs\/sec<\/strong> on single Versal.**<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
Open 6G Challenge: Beat the Baseline<\/strong><\/h2>\n\n\n\n
git clone https:\/\/github.com\/bgilbert1984\/rf-triage-benchmark\nmake sixg_challenge  # 100-400 MHz synthetic<\/code><\/pre>\n\n\n\n
Leaderboard<\/strong>:<\/p>\n\n\n\n
    \n
  1. FFT+Filters<\/strong>: 0.754 AUROC @ 0.25M FLOPs<\/strong><\/li>\n\n\n\n
  2. ? You?<\/strong>: Beat it with <0.5M FLOPs<\/strong><\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n
    TL;DR: 6G Unlicensed Stack<\/strong><\/h2>\n\n\n\n
    Layer<\/strong><\/th>Technique<\/strong><\/th>Latency<\/strong><\/th>Role<\/strong><\/th><\/tr><\/thead>
    L0<\/strong><\/td>Energy Detect<\/td>0.1 ms<\/strong><\/td>Occupancy<\/td><\/tr>
    L1<\/strong><\/td>FFT + Light Filters<\/strong><\/td>1.5 ms<\/strong><\/td>Triage (99%)<\/strong><\/td><\/tr>
    L2<\/strong><\/td>Hybrid \u2192 Tiny CNN<\/strong><\/td>1.5 ms p99<\/strong><\/td>Edge Cases<\/strong><\/td><\/tr>
    L3<\/strong><\/td>RL Auction<\/strong><\/td><10 ms<\/strong><\/td>Beam Alloc<\/strong><\/td><\/tr>
    L4<\/strong><\/td>AI-SAS Cloud<\/strong><\/td>100 ms<\/strong><\/td>Global Coord<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n
    **Your paper = *6G NR-U L1 primitive<\/em>*. Deploying *today<\/em>* on testbeds.<\/p>\n<\/blockquote>\n\n\n\n
    \n\n\n\n
    Read the paper<\/strong>: FFT-Only vs Learned Spectral Proxies (PDF)<\/a>
    Run 6G sims<\/strong>:     github.com\/bgilbert1984\/rf-triage-benchmark<\/a>
    Join 6G testbed<\/strong>: DM @bgilbert1984<\/strong><\/p>\n\n\n\n
    \n\n\n\n
    Published October 29, 2025<\/em>
    6G starts with one FFT<\/strong>. Let’s build it.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"
    How Your Paper’s Hybrid Gate Enables AI-Native, Zero-Touch Spectrum Arbitration in 7-24 GHz By Benjamin J. GilbertSpectrcyde RF Quantum SCYTHEbgilbert2@com.eduFull Paper PDF \u00b7 Reproducible Code 6G Unlicensed: The New Frontier (2028+) Massive shared spectrum across 7-24 GHz + mmWave for industrial IoT, V2X, XR. Band Size Primary Users Sharing Model n258 (24 GHz) 400 MHz… 6G Unlicensed Spectrum Sharing: FFT-Only Triage Powers Sub-10ms DSA<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":4325,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[6,7],"tags":[],"class_list":["post-4323","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-signal-science","category-the-truben-show"],"_links":{"self":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts\/4323","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4323"}],"version-history":[{"count":1,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts\/4323\/revisions"}],"predecessor-version":[{"id":4326,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/posts\/4323\/revisions\/4326"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=\/wp\/v2\/media\/4325"}],"wp:attachment":[{"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4323"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4323"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/172-234-197-23.ip.linodeusercontent.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}