Lab 8.5 - OFDM mini link¶

Lab 8.5 - OFDM mini link (CP, pilots, sync, equalization)¶

Goal¶

Build a compact OFDM chain that includes:

cyclic prefix handling;
pilot carriers;
coarse frame synchronization;
CFO estimation/correction;
simple channel estimation and equalization;
BER/EVM reporting.

Executable file¶

File	Purpose
`blocks/block_08_modulation_and_synchronization/python/lab_8_5_ofdm_mini_link.py`	OFDM TX/RX mini link with metrics

Run from the repository root:

python blocks/block_08_modulation_and_synchronization/python/lab_8_5_ofdm_mini_link.py

Generated artifacts¶

docs/assets/lab85_ofdm_sync_metric.png
docs/assets/lab85_ofdm_equalized_constellation.png
docs/assets/lab85_ofdm_channel_estimate.png
docs/assets/lab85_ofdm_metrics.json

Processing chain¶

flowchart LR
    BITS[bits] --> MAP[QPSK mapper]
    MAP --> OFDM[OFDM symbol + CP]
    OFDM --> CH[multipath + CFO + noise]
    CH --> SYNC[coarse sync + CFO correction]
    SYNC --> FFT[FFT + pilot phase correction]
    FFT --> EQ[channel equalization]
    EQ --> DEC[hard decisions]
    DEC --> METRICS[BER and EVM]

Report checklist¶

[ ] Include sync metric plot and estimated start sample.
[ ] Include CFO estimate and residual error.
[ ] Include channel estimate and equalized constellation.
[ ] Report BER and EVM.
[ ] Explain simplifications compared to full OFDM modem.