https://okwujun.pw/en/Hands-on Wi-Fi CSI (channel state information) on a GL-MT6000 / MT7986 router: full reproduction guide, 256-subcarrier measurements, Python tooling and engineering troubleshooting.enhttps://okwujun.pw/en/about/Router CSI Lab is an independent project maintained by Wu Jun, focused on reproducible GL-MT6000 / MT7986 Wi-Fi CSI. Covers author responsibility, hardware, public data, commercial independence, AI disclosure, privacy and contact.https://okwujun.pw/en/corrections/A public record of substantive corrections to Router CSI Lab: demo group counts, sampling-rate denominators, Home Assistant capability claims, Raspberry Pi/Nexmon requirements, ESP32 evaluation, links and 404 navigation.https://okwujun.pw/en/csi-capture-checker/Load a .bin capture produced by this project's csi_capture script and check framing, closed measurement groups, chain consistency, subcarriers, timestamp gaps and I/Q integrity in the browser. Files stay local and reports can be exported as JSON or Markdown.https://okwujun.pw/en/csi-chain-health/A reproducible Wi-Fi CSI chain selection audit across two GL-MT6000 captures: 6,714 of 7,609 ten-minute groups contain all eight chains, while all 347 sixty-second groups do. A fixed best chain does not transfer across sessions.https://okwujun.pw/en/csi-dataset-parsing/A hands-on Python walkthrough of the 10-minute router CSI dataset on Zenodo: verify eight parts, reassemble, parse the 24-byte header, build an amplitude heatmap and validate 57,293 records.https://okwujun.pw/en/csi-subcarrier-redundancy/A reproducible PCA audit of two public GL-MT6000 captures: on the 10-minute data, 6 components explain 90% of variance, 9 explain 95% and 20 explain 99%, while adjacent bins have a median correlation of 0.901. The result is limited to amplitude correlation structure, not physical frequency mapping or human-sensing performance.https://okwujun.pw/en/csi-timestamp-gaps-spectrum/Do not disguise an average group rate as a uniform clock. A reproducible audit of the public GL-MT6000 capture quantifies long gaps, interpolation error and estimator disagreement, with explicit limits on what the data cannot prove.https://okwujun.pw/en/datasets/A real GL-MT6000 / MT7986 CSI dataset: 10-second sample, 60-second browser-demo source, 10-minute Zenodo capture, data dictionary, 57,293 records, 7,609 measurement groups, SHA-256, statistics, privacy and citation.https://okwujun.pw/en/demo/No install required: replay a real GL-MT6000 CSI capture with 347 complete measurement groups, an amplitude heatmap, a rate-limited Doppler view and a motion curve. Includes the anonymised source, SHA-256, parameters and limits.https://okwujun.pw/en/esp32-csi-human-detection/Use ESP32 CSI as a motion/presence proxy: choose a transmitter, validate packet rate and CSI length, normalize per subcarrier, smooth time series, calibrate with hysteresis and evaluate real-room failures.https://okwujun.pw/en/esp32-csi/Use ESP32 CSI for Wi-Fi sensing with Espressif's esp-csi and ESP-IDF docs: single-board and two-board paths, LLTF/HT-LTF/STBC, sampling limits and MT6000 tradeoffs.https://okwujun.pw/en/gl-mt6000-csi-firmware-preflight/A reproducible pre-flash audit of the OpenWrt CSI image: board identifier, sysupgrade SHA-256, stock rollback hash, MT7986 Wi-Fi firmware MD5/SHA-256, mt7915e CSI symbols, userspace daemon and installed package versions.https://okwujun.pw/en/gl-mt6000-csi-lab-log/A reproducible GL-MT6000 lab log: image preflight and rollback, first CSI, ten-minute capture acceptance, daemon fault injection, a misdiagnosed 100 Mbps link, ATF and 40/80 MHz client traps, data de-identification and evidence limits.https://okwujun.pw/en/gl-mt6000-csi/A reproducible Wi-Fi CSI tutorial for a CSI-capable GL-MT6000 router: build OpenWrt with the mt76 patch, flash, enable CSI and validate the UDP stream.https://okwujun.pw/en/methodology/How this site binds claims to A–E evidence, checks DOI metadata and primary documents, separates source grade from applicability, publishes first-party data, discloses AI assistance and corrects errors by severity.https://okwujun.pw/en/mt76-rate-control-mcs0/A measured investigation into mt76 firmware rate adaptation: which counters matter, why last-tx-bitrate misleads, the vow_atf bug that prevents recovery, and the A/B test that proves it.https://okwujun.pw/en/nexmon-csi/A source-checked Nexmon CSI guide: supported Broadcom chips, legacy and modern Raspberry Pi installation paths, Pi 5 kernel requirements, UDP format, capture settings, failure checks and rollback.https://okwujun.pw/en/openwrt-wifi-slow-after-idle/One client slow, downlink pinned at MCS0, a WAN that only looks 100 Mbps, or a 40 MHz client inside an 80 MHz BSS? Follow direction tests, rate sampling, byte accounting and two reversible A/B experiments.https://okwujun.pw/en/privacy/Router CSI Lab's privacy policy: what we collect and what we deliberately do not, how cookies and Google AdSense advertising work here, and how to opt out of personalised ads.https://okwujun.pw/en/router-csi-capture-quality-audit/We grouped 57,293 raw GL-MT6000 CSI records by chain_info bit 15 and audited 7,608 usable measurements: timing percentiles, 4/8-chain groups, RSSI, SNR, long gaps and the limits for respiration or fall analysis.https://okwujun.pw/en/terms/Router CSI Lab terms of service: delivery and license of digital products, pricing and third-party checkout platforms, refunds and withdrawal rights, disclaimers, liability and governing law.https://okwujun.pw/en/tools/Open-source Wi-Fi sensing tools, GitHub releases, capture scripts, Python analysis, the UDP data format and the 10-minute raw I/Q dataset.https://okwujun.pw/en/what-is-wifi-csi/What CSI is, how it differs from RSSI, what it can and cannot do, five hardware routes compared, and how to get 256-subcarrier CSI from a home router.https://okwujun.pw/en/wifi-csi-2.4ghz-vs-5ghz/Band choice changes propagation, subcarriers and interference, but '2.4 GHz penetrates and 5 GHz is fast' is not enough. Here are our measurements, a reproducible A/B protocol, channel scans and why our 2.4 GHz anomaly remains unresolved.https://okwujun.pw/en/wifi-csi-80mhz-vs-40mhz/Bandwidth controls CSI frequency resolution. We explain range bins, MT7986 measurements, why 95.5 chain records/s is not a 95.5 Hz timeline, and the 40 MHz client inside an 80 MHz BSS failure.https://okwujun.pw/en/wifi-csi-esp32s3/Does the ESP32-S3 support Wi-Fi CSI? Yes, and Espressif documents the exact payload. Here is what you get (2.4 GHz, 20/40 MHz), the S3-specific gotcha, and when to move to an ESP32-C5 or a router.https://okwujun.pw/en/wifi-csi-fall-detection/Fall detection is not presence detection, and eight chains do not turn 12.64 Hz snapshots into 95 Hz micro-Doppler. This guide covers event envelopes, context, recovery, capture protocols, event-level metrics and compliance.https://okwujun.pw/en/wifi-csi-privacy-anonymization/Wi-Fi CSI has no camera, but it is not automatically anonymous. Peer-reviewed evidence, ICO/NIST guidance and this project's public capture are used to explain direct identifiers, quasi-identifiers, behavioural inference, MAC replacement and time shifting.https://okwujun.pw/en/wifi-csi-python/A verified pipeline from raw I/Q to useful features: parse 24/28-byte headers, group on chain_info bit 15, select a valid chain, resample by timestamp, clean phase, build amplitude heatmaps and a real one-second motion metric.https://okwujun.pw/en/wifi-csi-radar/A radar analogy for CSI sensing, separated into motion envelopes, presence, range, low-frequency Doppler, angle and imaging. We explain why a 12.64 Hz GL-MT6000 snapshot rate cannot claim full gait micro-Doppler or through-wall imaging.https://okwujun.pw/en/wifi-csi-raspberry-pi/A Raspberry Pi can be a Nexmon CSI capture node or the analysis host for router CSI. Compare the roles, Pi 5 requirements, real data-rate formulas, storage and network budgets, deployment checks and rollback.https://okwujun.pw/en/wifi-csi-respiration/A runnable Wi-Fi respiratory monitoring and heart-rate pipeline: phase processing, spectral estimation, sampling and window requirements, quality gates and failure conditions.https://okwujun.pw/en/wifi-sensing-home-assistant/Connect Wi-Fi CSI sensing to Home Assistant through ESPectre ESPHome entities, native MQTT Discovery, or this project's router REST service. Covers entity semantics, calibration, availability and privacy.https://okwujun.pw/en/wifi-sensing-through-walls/Through-wall Wi-Fi can detect motion, but it is not wall-penetrating imaging. Separate motion, presence, localisation, pose and identity; understand wall/multipath effects; and run a home experiment that reports misses and false alarms.https://okwujun.pw/en/wifi-sensing-vs-mmwave/Compare Wi-Fi CSI and millimetre-wave radar by physics, coverage, occlusion, privacy, cost and evaluation protocol. Learn what FMCW range/velocity/angle really means, why one radar is not a whole-home sensor, and how to fuse sensors in Home Assistant.https://okwujun.pw/en/wifi-slow-troubleshooting/A reproducible investigation: one Mac's downlink fell from about 400 Mbps to 6–10 Mbps. The evidence covers A/B tests, byte accounting, a vow_atf repair switch and a 40 MHz client inside an 80 MHz BSS.