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recv: quantize phase on {1,i,-1,-i}

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Roman Zeyde
2014-08-14 21:19:46 +03:00
parent ed6022ccd8
commit 65200d1038
1 changed files with 2 additions and 1 deletions
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3
amodem/recv.py
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@@ -115,7 +115,8 @@ def receive_prefix(symbols):
last_phase = a * indices[-1] + b last_phase = a * indices[-1] + b
log.debug('Current phase on carrier: %.3f', last_phase) log.debug('Current phase on carrier: %.3f', last_phase)
expected_phase, = set(np.angle(sliced[nonzeros]) / (2 * np.pi)) angle = np.mean(np.angle(S[nonzeros]))
expected_phase = round(angle / (0.5*np.pi)) * 0.25
log.debug('Excepted phase on carrier: %.3f', expected_phase) log.debug('Excepted phase on carrier: %.3f', expected_phase)
sampling_err = (last_phase - expected_phase) * config.Nsym sampling_err = (last_phase - expected_phase) * config.Nsym