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working prel. version of 110C mode decoder

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This commit is contained in:
cmayer 2019-05-20 15:02:28 +02:00
parent 21f8d9e228
commit 1034b6045e
1 changed files with 9 additions and 7 deletions
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16
python/physical_layer/MIL_STD_188_110C.py
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@ -73,7 +73,7 @@ class ScrambleData(object):
return r
def _advance(self):
self._state = np.concatenate(([np.sum(self._state&self._taps)&1],
self._state = np.concatenate(([self._state.dot(self._taps)&1],
self._state[0:-1]))
## ---- preamble definitions ---------------------------------------------------
@ -97,7 +97,8 @@ REINSERTED_PREAMBLE=common.n_psk(8, np.array(
0,4,0,4,0,0,4,4,0,0,0,0,0, # + D2
6,
4,4,4,4,4,6,0,2,4,0,4,0,4,2,0,6,4,4,4,4,4,6,0,2,4,0,4,0,4,2,0])) ## MP-
## length 31
## length 31 mini-probes
MINI_PROBE=[common.n_psk(8, np.array([0,0,0,0,0,2,4,6,0,4,0,4,0,6,4,2,0,0,0,0,0,2,4,6,0,4,0,4,0,6,4])), ## sign = + (0)
common.n_psk(8, np.array([4,4,4,4,4,6,0,2,4,0,4,0,4,2,0,6,4,4,4,4,4,6,0,2,4,0,4,0,4,2,0]))] ## sign = - (1)
@ -155,8 +156,8 @@ class DeIntl_DePunct(object):
def __init__(self, size, incr):
self._size = size
self._i = 0
self._array = np.zeros(size, dtype=np.float32)
self._idx = np.mod(incr*np.arange(size, dtype=np.uint32), size)
self._array = np.zeros(size, dtype=np.float64)
self._idx = np.mod(incr*np.arange(size, dtype=np.int32), size)
print('deinterleaver: ', size, incr, self._idx[0:100])
def fetch(self, a):
@ -173,6 +174,7 @@ class DeIntl_DePunct(object):
self._i += n
result = np.zeros(0, dtype=np.float64)
if self._i == self._size:
print('deinterleaver: ', self._idx[0:100])
print('==== TEST ====', self._array)
#tmp = np.zeros(self._size, dtype=np.float32)
tmp = self._array[self._idx]
@ -237,7 +239,7 @@ class PhysicalLayer(object):
success = self.decode_reinserted_preamble(symbols)
else:
success = self.get_data_frame_quality(symbols)
return [self.make_data_frame(success),self._constellation_index,success,not got_reinserted_preamble]
return [self.make_data_frame(success),self._constellation_index,success,True]
def get_doppler(self, iq_samples):
"""quality check and doppler estimation for preamble"""
@ -278,7 +280,7 @@ class PhysicalLayer(object):
return np.abs(np.mean(symbols[-32:])) > 0.5
def get_data_frame_quality(self, symbols):
print('get_data_frame_quality', symbols[-31:])
print('get_data_frame_quality', np.mean(symbols[-31:]))
return np.abs(np.mean(symbols[-31:])) > 0.5
def decode_reinserted_preamble(self, symbols):
@ -364,7 +366,7 @@ class PhysicalLayer(object):
if r.shape[0] == 0:
return []
self._viterbi_decoder.reset()
decoded_bits = self._viterbi_decoder.udpate(r)
decoded_bits = np.roll(self._viterbi_decoder.udpate(r), 7)
print('bits=', decoded_bits[:100])
print('quality={}% ({},{})'.format(120.0*self._viterbi_decoder.quality()/(2*len(decoded_bits)),
self._viterbi_decoder.quality(),