# closed_grid_n5db_ofdm_v2

**Description:** OFDM+LDPC OTA, fc=2.45 GHz, tx_gain=-5 dB, step10 RX, back-to-back with OTFS-n5db_v2; channel past LDPC cliff

**Key result:** 0/92 attempts = 0%, raw BER median 0.47

**Source:** `/tmp/ofdm_ldpc_n5_v2/run_20260531_162432`

**Stats:** 205 files, 446.1 MB

**Common columns in each `cap_*.npz`:**
- `rxw` (complex64) — raw RX samples (one capture window)
- `meta_json` (str) — per-capture metadata: cfo_hz, pilot_rx, snr_post, etc.
- (OFDM step10 only) `Yeq_data` (complex64, shape `(num_syms, 48)`) — equalised data subcarrier symbols ready for LDPC post-decode

**Filename suffix convention:** `_ok` = packet decoded, `_fail`/`_bg` = decode failed / pure background.

**Reproducibility:** see `../README.md` (top-level dataset card) and the paper, [`globecom2026_otfs_doppler.pdf`](https://github.com/lkk688/RF-Stream-PHY/tree/main/OTFS/paper).