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phase lut

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This commit is contained in:
Jinghao Shi
2017-04-07 11:37:11 -04:00
parent 779b3651a4
commit df46bc5309
2 changed files with 47 additions and 13 deletions
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9
scripts/decode.py
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@ -225,6 +225,7 @@ class ChannelEstimator(object):
prod_sum += prod
beta = cmath.phase(prod_sum)
print "[PILOT OFFSET] %f (%d)" % (beta, int(beta*PHASE_SCALE))
# beta = 0
carriers = []
for c in self.subcarriers:
if c in PILOT_SUBCARRIES:
@ -269,8 +270,8 @@ class ChannelEstimator(object):
coarse_offset = cmath.phase(sum([sts[i]*sts[i+16].conjugate()
for i in range(len(sts)-16)]))/16
coarse_offset = int(coarse_offset*256)/256.0
print '[COARSE OFFSET] %f (%d)' % (coarse_offset, int(coarse_offset*PHASE_SCALE))
# coarse_offset = 0
# coarse correction
lts = [c*cmath.exp(complex(0, n*coarse_offset))
@ -279,7 +280,7 @@ class ChannelEstimator(object):
fine_offset = cmath.phase(sum([lts[i]*lts[i+64].conjugate()
for i in range(len(lts)-64)]))/64
print '[FINE OFFSET] %f (%d)' % (fine_offset, int(fine_offset*PHASE_SCALE))
fine_offset = 0
# fine_offset = 0
self.lts_samples = [c*cmath.exp(complex(0, n*fine_offset))
for n, c in enumerate(lts)]
@ -430,6 +431,7 @@ class Decoder(object):
def decode_next(self, *args, **kwargs):
trigger = False
samples = []
glbl_index = 0
while True:
chunk = array.array('h', self.fh.read(self.window))
chunk = [complex(i, q) for i, q in zip(chunk[::2], chunk[1::2])]
@ -437,6 +439,7 @@ class Decoder(object):
trigger = True
samples = []
print "Power trigger at %d" % (self.count)
glbl_index = self.count
self.count += self.window
@ -448,6 +451,8 @@ class Decoder(object):
if start is None:
trigger = False
else:
print "Decoding packet starting from sample %d" %\
(glbl_index + start)
return self.decode(samples[start:], *args, **kwargs)
def find_pkt(self, samples):