Description
802.11n (Wi-Fi 4, ratified 2009) is the standard most early CSI papers use because the canonical intel-5300 and Atheros tools (see atheros-csi-tool) target it. It introduced MIMO (up to 4x4 spatial streams) and 40 MHz channels, and its OFDM frame structure (LTF / HT-LTF training fields) is what every commodity CSI extractor parses. Despite being two generations behind the deployed state of the art, 802.11n remains the lingua franca of CSI research — most published datasets and most baselines are 802.11n.
Specs / capabilities
- 2.4 GHz and 5 GHz bands
- 20 MHz (56 OFDM subcarriers, 52 data) or 40 MHz (114 / 108) channels
- Up to 4x4 MIMO (most CSI tools cap at 3x3 for the IWL5300)
- HT-LTF training symbols allow per-subcarrier per-(Tx, Rx) channel estimation
- PHY rate up to 600 Mbps
Tooling
- intel-5300 + Linux 802.11n CSI Tool (decimated to 30 subcarriers)
- atheros-csi-tool (full 56 / 114 subcarriers)
- esp32 (single-stream 64 subcarriers)
Used by (papers)
- The default standard in pre-2019 CSI literature