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recv: fix equalizer training

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Roman Zeyde
2014-09-05 12:14:38 +03:00
parent 443dbf99ab
commit 7324a913fb
1 changed files with 6 additions and 2 deletions
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8
amodem/recv.py
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@@ -127,18 +127,22 @@ class Receiver(object):
return freq_err
def _train(self, sampler, order, lookahead):
gain = config.Nfreq
train_symbols = equalizer.train_symbols(train.equalizer_length)
train_signal = equalizer.modulator(train_symbols) * gain
prefix = postfix = train.silence_length * config.Nsym
signal_length = train.equalizer_length * config.Nsym + prefix + postfix
signal = sampler.take(signal_length + lookahead)
coeffs = equalizer.equalize_symbols(
coeffs = equalizer.equalize_signal(
signal=signal[prefix:-postfix],
symbols=train_symbols,
expected=train_signal,
order=order, lookahead=lookahead
)
log.debug('Equalization filter: [%s]', ', '.join('{:.2f}'.format(c) for c in coeffs))
equalization_filter = dsp.FIR(h=coeffs)
equalized = list(equalization_filter(signal))
equalized = equalized[prefix+lookahead:-postfix+lookahead]