Channel Equalization

L1 Multipath Channel Equalization Skill 🎛️

Use this skill when received RF IQ signals suffer from multipath fading, delay spread, or frequency-selective channel distortion. Equalization recovers constellation clarity and reduces EVM prior to synchronization and demodulation.

Instructions

1. Execute Channel Equalization CLI Tool:

   PYTHONPATH=/usr/lib/python3/dist-packages:. .agents/skills/channel-equalization/scripts/equalize_channel.py --input /tmp/impaired_signal.sigmf-data --algo MMSE --taps "1.0, 0.4+0.2j" --output /tmp/equalized_signal.sigmf-data
   

2. Programmatic Usage:

   from gr_playground.dsp.equalization import L1Equalizer
   
   # Zero-Forcing Equalization
   clean_iq = L1Equalizer.equalize_zero_forcing(impaired_iq, channel_taps=[1.0, 0.3+0.1j])
   
   # MMSE Regularized Equalization
   clean_iq = L1Equalizer.equalize_mmse(impaired_iq, channel_taps=[1.0, 0.3+0.1j], snr_db=25.0)
   
   # Adaptive LMS Decision-Directed Equalization
   clean_iq = L1Equalizer.equalize_lms_adaptive(impaired_iq, num_taps=11, mu=0.01, mod_type="QPSK")