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Fix detect.

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Roman Zeyde
2014-07-04 17:34:21 +03:00
parent 818ca9e8e4
commit cabf215d1f
1 changed files with 6 additions and 6 deletions
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12
recv.py
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@@ -27,7 +27,7 @@ def coherence(x, freq):
Hc = exp_iwt(-freq, n) / np.sqrt(0.5*n) Hc = exp_iwt(-freq, n) / np.sqrt(0.5*n)
return np.dot(Hc, x) / norm(x) return np.dot(Hc, x) / norm(x)
def detect(freq): def detect(x, freq):
counter = 0 counter = 0
for offset, coeff in iterate(x, Nsym, advance=Nsym, func=lambda x: coherence(x, Fc)): for offset, coeff in iterate(x, Nsym, advance=Nsym, func=lambda x: coherence(x, Fc)):
if abs(coeff) > COHERENCE_THRESHOLD: if abs(coeff) > COHERENCE_THRESHOLD:
@@ -126,10 +126,11 @@ def constellation(y):
pylab.plot(np.arange(len(y)) * Tsym, y.real, '.') pylab.plot(np.arange(len(y)) * Tsym, y.real, '.')
pylab.grid('on') pylab.grid('on')
def main(t, x): def main(fname):
x = (x - np.mean(x)) _, x = load(fname)
result = detect(Fc) x = x - np.mean(x)
result = detect(x, Fc)
if result is None: if result is None:
log.info('No carrier detected') log.info('No carrier detected')
return return
@@ -161,6 +162,5 @@ def main(t, x):
f.write(data) f.write(data)
if __name__ == '__main__': if __name__ == '__main__':
t, x = load('rx.int16') main('rx.int16')
main(t, x)
pylab.show() pylab.show()