Comments (1)
Hi @mhni-ES,
I understand you've changed the carrier frequency and modulation order to 4096-QAM. I can confirm your observation at 3.5GHz, likely due to the following reasons:
- CSI Errors: With high constellation orders like 4096-QAM, CSI estimation errors become more significant.
- Doppler Effect: The tutorial models mobility (10m/s), causing a dominant Doppler effect at higher frequencies, which is not fully compensated by channel estimation and interpolation at higher SNR.
- Channel Estimation: LMMSE equalization uses a channel estimation error variance that doesn't match the "true" variance due to mobility/Doppler.
- LLR Mismatch: LLRs might be computed on a mismatched model (see above points), affecting probability estimates taken in by the decoder.
You can mitigate this by either turning off mobility (speed=0.0) or choosing different subcarrier spacings.
Hope this helps!
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