preparations for XOR scrambling

work on 110C mode (intermediate)

examples/test_s4285.grc

@@ -164,7 +164,7 @@
     </param>
     <param>
       <key>value</key>
-      <value>'600/L'</value>
+      <value>'1200/L'</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -240,7 +240,7 @@
     </param>
     <param>
       <key>options</key>
-      <value>['2400/L', '1200/L', '600/L', '300/L', '150/L', '75/L']</value>
+      <value>['2400/L', '1200/L', '600/L', '300/L', '150/L', '75/L', '2400/S', '1200/S', '600/S', '300/S', '150/S', '75/S']</value>
     </param>
     <param>
       <key>orient</key>
@@ -877,11 +877,11 @@
     </param>
     <param>
       <key>file</key>
-      <value>/Users/chm/Software/gr-digitalhf/examples/on5kq.ddns.net_2019-03-20T12_49_38Z_2381.40_iq.wav</value>
+      <value>/Users/chm/Downloads/sdr.loginto.me_2019-05-14T13_46_37Z_7938.80_iq.wav</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(10, 154)</value>
+      <value>(21, 154)</value>
     </param>
     <param>
       <key>_rotation</key>

lib/adaptive_dfe_impl.cc

@@ -83,6 +83,7 @@ adaptive_dfe_impl::adaptive_dfe_impl(int sps, // samples per symbol
   , _constellation_index()
   , _symbols()
   , _scramble()
+  , _scramble_xor()
   , _descrambled_symbols()
   , _symbol_counter(0)
   , _save_soft_decisions(false)
@@ -280,7 +281,12 @@ gr_complex adaptive_dfe_impl::filter(gr_complex const* start, gr_complex const*
       float const err = std::abs(descrambled_filter_output - descrambled_symbol);
       std::vector<float> const soft_dec = constell->calc_soft_dec
         (descrambled_filter_output, _npwr[_constellation_index].filter(err));
-      std::copy(soft_dec.begin(), soft_dec.end(), std::back_inserter<std::vector<float> >(_vec_soft_decisions));
+      // std::cout << "SD: " << descrambled_filter_output << " : ";
+      for (int j=0, m=soft_dec.size(); j<m; ++j) {
+        _vec_soft_decisions.push_back(soft_dec[j] * _scramble_xor[_symbol_counter][j]);
+        // std::cout << " " << _vec_soft_decisions.back();
+      }
+      // std::cout << std::endl;
     }
     known_symbol = _scramble[_symbol_counter] * descrambled_symbol;
   }
@@ -289,6 +295,8 @@ gr_complex adaptive_dfe_impl::filter(gr_complex const* start, gr_complex const*
   if (is_known || update_taps) {
     // (3a) update of adaptive filter taps
     gr_complex const err =  filter_output - known_symbol;
+    if (std::abs(err)>0.5)
+      std::cout << "err= " << std::abs(err) << std::endl;
     //       taps_samples
     for (int j=0; j<_nB+_nF+1; ++j) {
       _last_taps_samples[j] = _taps_samples[j];
@@ -311,7 +319,7 @@ gr_complex adaptive_dfe_impl::filter(gr_complex const* start, gr_complex const*
     for (int j=_nB+1-2*_sps; j<_nB+1+2*_sps+1; ++j)
       acc += std::conj(_last_taps_samples[j]) * _taps_samples[j];
     float const frequency_err = gr::fast_atan2f(acc)/(1+0*_num_samples_since_filter_update); // frequency error (rad/sample)
-    std::cout << "frequency_err " << frequency_err << " " << _num_samples_since_filter_update << std::endl;
+    GR_LOG_DEBUG(d_logger, str(boost::format("frequency_err= %f %d") % frequency_err % _num_samples_since_filter_update));
     _control_loop.advance_loop(frequency_err);
     _control_loop.phase_wrap();
     _control_loop.frequency_limit();
@@ -390,8 +398,7 @@ void adaptive_dfe_impl::update_constellations(pmt::pmt_t data) {
   int const n = pmt::length(data);
   _constellations.resize(n);
   _npwr.resize(n);
-  std::cout << "adaptive_dfe_impl::update_constellations " << data << std::endl;
+  GR_LOG_DEBUG(d_logger, str(boost::format("update_constellations %s n=%d") % data % n));
-  std::cout << "adaptive_dfe_impl::update_constellations n=" << n << std::endl;
   unsigned int const rotational_symmetry = 0;
   unsigned int const dimensionality = 1;
 
@@ -415,6 +422,18 @@ void adaptive_dfe_impl::update_frame_info(pmt::pmt_t data)
   _constellation_index   = pmt::to_long(pmt::dict_ref(data, pmt::intern("constellation_idx"), pmt::PMT_NIL));
   _save_soft_decisions   = pmt::to_bool(pmt::dict_ref(data, pmt::intern("save_soft_dec"),     pmt::PMT_F));
   bool const do_continue = pmt::to_bool(pmt::dict_ref(data, pmt::intern("do_continue"),       pmt::PMT_F));
+
+  // make table +-1
+  std::vector<std::uint8_t> const scr_xor = pmt::u8vector_elements(pmt::dict_ref(data, pmt::intern("scramble_xor"), pmt::PMT_NIL));
+  _scramble_xor.resize(scr_xor.size());
+  gr::digital::constellation_sptr constell = _constellations[_constellation_index];
+  for (int i=0, n=scr_xor.size(); i<n; ++i) {
+    for (int j=0, m=constell->bits_per_symbol(); j<m; ++j) {
+      _scramble_xor[i][m-j-1] = 1 - 2*bool(scr_xor[i] & (1<<j));
+      // GR_LOG_DEBUG(d_logger, str(boost::format("XOR %3d %3d %d") % i % j % _scramble_xor[i][j]));
+    }
+  }
+
   assert(_symbols.size() == _scramble.size());
   _descrambled_symbols.resize(_symbols.size());
   _vec_soft_decisions.clear();

lib/adaptive_dfe_impl.h

@@ -81,7 +81,8 @@ private:
   int _npwr_max_time_constant;
   int _constellation_index;
   std::vector<gr_complex>   _symbols;
-  std::vector<gr_complex> _scramble;
+  std::vector<gr_complex>   _scramble; // PSK-8 scramble symbols
+  std::vector<std::array<int,8> > _scramble_xor; // signs for XOR scrambling
   std::vector<gr_complex>   _descrambled_symbols;
   int _symbol_counter;
 

python/msg_proxy.py

@@ -74,6 +74,7 @@ class msg_proxy(gr.basic_block):
         msg_out = pmt.make_dict()
         msg_out = pmt.dict_add(msg_out, pmt.intern('symb'), pmt.to_pmt(symb['symb']))
         msg_out = pmt.dict_add(msg_out, pmt.intern('scramble'), pmt.to_pmt(symb['scramble']))
+        msg_out = pmt.dict_add(msg_out, pmt.intern('scramble_xor'), pmt.to_pmt(symb['scramble_xor']))
         msg_out = pmt.dict_add(msg_out, pmt.intern('constellation_idx'), pmt.to_pmt(constellation_idx))
         msg_out = pmt.dict_add(msg_out, pmt.intern('do_continue'), pmt.to_pmt(np.bool(do_continue)))
         msg_out = pmt.dict_add(msg_out, pmt.intern('save_soft_dec'), pmt.to_pmt(np.bool(save_soft_dec)))

python/physical_layer/MIL_STD_188_110A.py

@@ -199,9 +199,7 @@ class PhysicalLayer(object):
             self._frame_counter = 0
         scramble_for_frame = common.n_psk(8, np.array([self._scr_data.next()
                                                        for _ in range(self._frame_len)]))
-        a = np.array(zip(scramble_for_frame,
+        a = common.make_scr(scramble_for_frame, scramble_for_frame)
-                         scramble_for_frame),
-                     common.SYMB_SCRAMBLE_DTYPE)
         n_unknown = self._mode['unknown']
         a['symb'][0:n_unknown] = 0
         if self._mode['known'] != 0 and self._frame_counter >= self._num_frames_per_block-2:
@@ -296,10 +294,8 @@ class PhysicalLayer(object):
     @staticmethod
     def get_preamble():
         """preamble symbols + scrambler"""
-        return np.array(zip(PRE_SCRAMBLE*PRE_SYMBOLS,
+        return common.make_scr(PRE_SCRAMBLE*PRE_SYMBOLS,
-                            PRE_SCRAMBLE),
+                               PRE_SCRAMBLE)
-                     common.SYMB_SCRAMBLE_DTYPE)
-
     def get_preamble_z(self):
         """preamble symbols for preamble correlation"""
         a = PhysicalLayer.get_preamble()

python/physical_layer/MIL_STD_188_110C.py

@@ -3,11 +3,12 @@
 from __future__ import print_function
 import numpy as np
 import common
+from digitalhf.digitalhf_swig import viterbi27
 
 ## ---- constellations -----------------------------------------------------------
 BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
 QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,7,6,4,5]), common.CONST_DTYPE)
+PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [1,0,2,3,7,6,4,5]), common.CONST_DTYPE)
 QAM16=np.array(
     zip([+0.866025+0.500000j,  0.500000+0.866025j,  1.000000+0.000000j,  0.258819+0.258819j,
          -0.500000+0.866025j,  0.000000+1.000000j, -0.866025+0.500000j, -0.258819+0.258819j,
@@ -104,29 +105,93 @@ 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,
 TO_DIBIT=[(0,0),(0,1),(1,1),(1,0)]
 
 ## ---- rate -------------------------------------------------------------------
-TO_RATE={(0,0,0): {'baud':    0, 'bits_per_symbol': 0},  ## reserved
+TO_RATE={(0,0,0): {'baud': '--------', 'bits_per_symbol': 0},  ## reserved
-         (0,0,1): {'baud': 3200, 'bits_per_symbol': 2, 'ci': MODE_QPSK},
+         (0,0,1): {'baud': '3200 bps', 'bits_per_symbol': 2, 'ci': MODE_QPSK},
-         (0,1,0): {'baud': 4800, 'bits_per_symbol': 3, 'ci': MODE_8PSK},
+         (0,1,0): {'baud': '4800 bps', 'bits_per_symbol': 3, 'ci': MODE_8PSK},
-         (0,1,1): {'baud': 6400, 'bits_per_symbol': 4, 'ci': MODE_16QAM},
+         (0,1,1): {'baud': '6400 bps', 'bits_per_symbol': 4, 'ci': MODE_16QAM},
-         (1,0,0): {'baud': 8000, 'bits_per_symbol': 5, 'ci': MODE_32QAM},
+         (1,0,0): {'baud': '8000 bps', 'bits_per_symbol': 5, 'ci': MODE_32QAM},
-         (1,0,1): {'baud': 9600, 'bits_per_symbol': 6, 'ci': MODE_64QAM},
+         (1,0,1): {'baud': '9600 bps', 'bits_per_symbol': 6, 'ci': MODE_64QAM},
-         (1,1,0): {'baud':12800, 'bits_per_symbol': 6, 'ci': MODE_64QAM},
+         (1,1,0): {'baud':'12800 bps', 'bits_per_symbol': 6, 'ci': MODE_64QAM},
-         (1,1,1): {'baud':    0, 'bits_per_symbol': 0}}  ## reserved
+         (1,1,1): {'baud': '--------', 'bits_per_symbol': 0}}  ## reserved
 
 ## ---- interleaver ------------------------------------------------------------
-TO_INTERLEAVER={(0,0,0): {'frames': -1, 'name': 'illegal'},
+TO_INTERLEAVER={(0,0,0): {'frames': -1, 'id': '--', 'name': 'illegal'},
-                (0,0,1): {'frames':  1, 'name': 'Ultra Short (US)'},
+                (0,0,1): {'frames':  1, 'id': 'US', 'name': 'Ultra Short'},
-                (0,1,0): {'frames':  3, 'name': 'Very Short (VS)'},
+                (0,1,0): {'frames':  3, 'id': 'VS', 'name': 'Very Short'},
-                (0,1,1): {'frames':  9, 'name': 'Short (S)'},
+                (0,1,1): {'frames':  9, 'id':  'S', 'name': 'Short'},
-                (1,0,0): {'frames': 18, 'name': 'Medium (M)'},
+                (1,0,0): {'frames': 18, 'id':  'M', 'name': 'Medium'},
-                (1,0,1): {'frames': 36, 'name': 'Long (L)'},
+                (1,0,1): {'frames': 36, 'id':  'L', 'name': 'Long'},
-                (1,1,0): {'frames': 72, 'name': 'very Long (VL)'},
+                (1,1,0): {'frames': 72, 'id': 'VL', 'name': 'Very Long'},
-                (1,1,1): {'frames': -1, 'name': 'illegal'}}
+                (1,1,1): {'frames': -1, 'id': '--', 'name': 'illegal'}}
+
+MP_COUNTER=[(0,0,1), ## 1st
+            (0,1,0), ## 2nd
+            (0,1,1), ## 3rd
+            (1,0,0)] ## 4th
+
+## ---- interleaver size
+INTL_SIZE = { ## 1 3 9 18 36 72
+    '--------': {'US':    0, 'VS':    0, 'S':     0, 'M':     0, 'L':     0, 'VL':      0},
+    '3200 bps': {'US':  512, 'VS': 1536, 'S':  4608, 'M':  9216, 'L': 18432, 'VL':  36864},
+    '4800 bps': {'US':  768, 'VS': 2304, 'S':  6912, 'M': 13824, 'L': 27648, 'VL':  55296},
+    '6400 bps': {'US': 1024, 'VS': 3072, 'S':  9216, 'M': 18432, 'L': 36864, 'VL':  73728},
+    '8000 bps': {'US': 1280, 'VS': 3840, 'S': 11520, 'M': 23040, 'L': 46080, 'VL':  92160},
+    '9600 bps': {'US': 1536, 'VS': 4608, 'S': 13824, 'M': 27648, 'L': 55296, 'VL': 110592}
+}
+
+## ---- interleaver increment
+INTL_INCR = { ## 1 3 9 18 36 72
+    '--------': {'US':   0, 'VS':   0, 'S':    0, 'M':    0, 'L':     0, 'VL':     0},
+    '3200 bps': {'US':  97, 'VS': 229, 'S':  805, 'M': 1393, 'L':  3281, 'VL':  6985},
+    '4800 bps': {'US': 145, 'VS': 361, 'S': 1045, 'M': 2089, 'L':  5137, 'VL': 10273},
+    '6400 bps': {'US': 189, 'VS': 481, 'S': 1393, 'M': 3281, 'L':  6985, 'VL': 11141},
+    '8000 bps': {'US': 201, 'VS': 601, 'S': 1741, 'M': 3481, 'L':  8561, 'VL': 14441},
+    '9600 bps': {'US': 229, 'VS': 805, 'S': 2089, 'M': 5137, 'L': 10273, 'VL': 17329}
+}
+
+## ---- deinterleaver+depuncturer
+class DeIntl_DePunct(object):
+    """deinterleave"""
+    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)
+        print('deinterleaver: ', size, incr, self._idx[0:100])
+
+    def fetch(self, a):
+        pass
+
+    def load(self, a):
+        n = len(a)
+        i = self._i
+        if i==0:
+            self._array[:] = 0
+        print('deinterleaver load buffer:', i,len(self._array),n)
+        assert(i+n <= self._size)
+        self._array[i:i+n] = a
+        self._i += n
+        result = np.zeros(0, dtype=np.float64)
+        if self._i == self._size:
+            print('==== TEST ====', self._array)
+            #tmp = np.zeros(self._size, dtype=np.float32)
+            tmp = self._array[self._idx]
+            result = np.zeros(self._size*6//4, dtype=np.float64)
+            assert(len(result[0::6]) == len(tmp[0::4]))
+            assert(len(result[1::6]) == len(tmp[1::4]))
+            assert(len(result[2::6]) == len(tmp[2::4]))
+            assert(len(result[5::6]) == len(tmp[3::4]))
+            result[0::6] = tmp[0::4]
+            result[1::6] = tmp[1::4]
+            result[2::6] = tmp[2::4]
+            result[3::6] = 0
+            result[4::6] = 0
+            result[5::6] = tmp[3::4]
+            print('==================== interleaver is full! ====================',
+                  len(result[0::6]), len(tmp[0::4]), np.sum(result==0))
+            self._i = 0
+        return result
 
-MP_COUNTER=[(0,0,1),
-            (0,1,0),
-            (0,1,1),
-            (1,0,0)]
 
 ## ---- physcal layer class -----------------------------------------------------
 class PhysicalLayer(object):
@@ -138,7 +203,8 @@ class PhysicalLayer(object):
         self._frame_counter = -2
         self._constellations = [BPSK, QPSK, PSK8, QAM16, QAM32, QAM64]
         self._preamble = self.get_preamble()
-        self._interleaver_length = 72 ## set in decode_reinserted preamble to the actual value
+        self._scramble = ScrambleData()
+        self._viterbi_decoder = viterbi27(0x6d, 0x4f)
 
     def get_constellations(self):
         return self._constellations
@@ -153,6 +219,8 @@ class PhysicalLayer(object):
         print('-------------------- get_frame --------------------', self._frame_counter)
         success = True
         if self._frame_counter == -2: ## ---- preamble
+            self._deintl_depunct = None
+            self._mode = {}
             self._preamble_offset = 0
             self._frame_counter += 1
             return [self._preamble,MODE_BPSK,success,False]
@@ -215,46 +283,67 @@ class PhysicalLayer(object):
 
     def decode_reinserted_preamble(self, symbols):
         ## decode D0,D1,D2
+        success = True
         z = np.array([np.mean(symbols[-71+i*13:-71+(i+1)*13]) for i in range(3)])
-        print('decode_reinserted_preamble', symbols[0:-71], symbols[-71:-71+3*13], symbols[-71+4*13:], z)
+        if np.mean(np.abs(z)) < 0.4:
+            return False
+        print('decode_reinserted_preamble',
+              '\nHH', symbols[0:-71],
+              '\nD0', symbols[-71   :-71+13],
+              '\nD1', symbols[-71+13:-71+26],
+              '\nD2', symbols[-71+26:-71+39],
+              '\nTT', symbols[-71+4*13:], z)
         d0d1d2 = map(np.uint8, np.mod(np.round(np.angle(z)/np.pi*2),4))
         dibits = [TO_DIBIT[idx] for idx in d0d1d2]
-        self._mode = {'rate':        tuple([x[0] for x in dibits]),
+        mode = {'rate':        tuple([x[0] for x in dibits]),
                 'interleaver': tuple([x[1] for x in dibits])}
-        print('======== rate,interleaver:',
+        if self._mode != {}:
-              TO_RATE[self._mode['rate']],
+            success = (mode == self._mode)
-              TO_INTERLEAVER[self._mode['interleaver']])
+        if not success:
-        self._interleaver_length = TO_INTERLEAVER[self._mode['interleaver']]['frames']
+            return success
-        rate_info = TO_RATE[self._mode['rate']]
+        self._mode = mode
-        print('rate_info', rate_info)
+        self._rate_info = rate_info = TO_RATE[self._mode['rate']]
+        self._intl_info = intl_info = TO_INTERLEAVER[self._mode['interleaver']]
+
+        print('======== rate,interleaver:', rate_info, intl_info)
+        self._interleaver_frames = intl_info['frames']
+        baud      = rate_info['baud']
+        intl_id   = intl_info['id']
+        intl_size = INTL_SIZE[baud][intl_id]
+        intl_incr = INTL_INCR[baud][intl_id]
+        if self._deintl_depunct == None:
+            self._deintl_depunct = DeIntl_DePunct(size=intl_size,
+                                                  incr=intl_incr)
         self._constellation_index = rate_info['ci']
         print('constellation index', self._constellation_index)
-        scr = ScrambleData()
+        self._scramble.reset()
-        iscr = [scr.next(rate_info['bits_per_symbol']) for _ in range(256)]
+        num_bits = max(3, rate_info['bits_per_symbol'])
-        if rate_info['ci'] > MODE_8PSK:
+        iscr = np.array([self._scramble.next(num_bits) for _ in range(256)],
+                        dtype=np.uint8)
+        print('iscr=', iscr)
         self._data_scramble     = np.ones (256, dtype=np.complex64)
+        self._data_scramble_xor = np.zeros(256, dtype=np.uint8)
+        if rate_info['ci'] > MODE_8PSK:
+            self._data_scramble_xor = iscr
         else:
-            constell = self._constellations[rate_info['ci']]
+            self._data_scramble = common.n_psk(8, iscr)
-            self._data_scramble = constell[iscr]['points']
-        success = True ## TODO
         return success
 
     def make_reinserted_preamble(self, offset, success):
-        """ offset=  0 -> 1st reinserted preamble
+        """ offset=  0 -> 1st reinsesrted preamble
             offset=-72 -> all following reinserted preambles"""
-        a=np.array(zip(REINSERTED_PREAMBLE[offset:],
+        a = common.make_scr(REINSERTED_PREAMBLE[offset:], REINSERTED_PREAMBLE[offset:])
-                       REINSERTED_PREAMBLE[offset:]),
-                     common.SYMB_SCRAMBLE_DTYPE)
         a['symb'][-71:-71+3*13] = 0 ## D0,D1,D2
-        print('make_reinserted_preamble', offset, success, len(a['symb']), a['symb'], a['scramble'])
+        print('make_reinserted_preamble', offset, success, len(a['symb']))
         if not success:
-            self._frame_counter = -1
+            self._frame_counter = -2
         return a
 
     def make_data_frame(self, success):
         self._preamble_offset = -72 ## all following reinserted preambles start at index -72
         a = np.zeros(256+31, common.SYMB_SCRAMBLE_DTYPE)
         a['scramble'][:256]     = self._data_scramble
+        a['scramble_xor'][:256] = self._data_scramble_xor
         n = (self._frame_counter-1)%72
         if self._frame_counter == 72:
             self._frame_counter = -1
@@ -267,18 +356,25 @@ class PhysicalLayer(object):
         a['symb'][256:]     = MINI_PROBE[self._mp[m]]
         a['scramble'][256:] = MINI_PROBE[self._mp[m]]
         if not success:
-            self._frame_counter = -1
+            self._frame_counter = -2
         return a
 
     def decode_soft_dec(self, soft_dec):
-        return soft_dec
+        r = self._deintl_depunct.load(soft_dec)
+        if r.shape[0] == 0:
+            return []
+        self._viterbi_decoder.reset()
+        decoded_bits = self._viterbi_decoder.udpate(r)
+        print('bits=', decoded_bits[:100])
+        print('quality={}% ({},{})'.format(120.0*self._viterbi_decoder.quality()/(2*len(decoded_bits)),
+                                           self._viterbi_decoder.quality(),
+                                           len(decoded_bits)))
+        return decoded_bits
 
     @staticmethod
     def get_preamble():
         """preamble symbols + scrambler"""
-        return np.array(zip(PREAMBLE,
+        return common.make_scr(PREAMBLE, PREAMBLE)
-                            PREAMBLE),
-                     common.SYMB_SCRAMBLE_DTYPE)
 
     def get_preamble_z(self):
         """preamble symbols for preamble correlation"""

python/physical_layer/MIL_STD_188_110D.py

@@ -772,9 +772,14 @@ class PhysicalLayer(object):
         else:
             self._state = 'MP'
             a = np.zeros(self._unknown, common.SYMB_SCRAMBLE_DTYPE)
+            a['scramble'][:] = 1
             self._scr_data.reset()
-            for i in range(self._unknown): ## TODO: handle QAM modes
+            if self._wid_mode <= MODE_8PSK: ## not QAM
+                for i in range(self._unknown):
                     a['scramble'][i] = np.exp(2j*np.pi*self._scr_data.next()/8)
+            else: ## QAM modes
+                for i in range(self._unknown):
+                    a['scramble_xor'][i] = self._scr_data.next()
             return self._data_mode,a
 
     def get_doppler(self, iq_samples):
@@ -869,16 +874,12 @@ class PhysicalLayer(object):
         CNT_SCR   = common.n_psk(8, np.concatenate([CNT_PN   for _ in range(4)]))[:len(CNT_SYMB)]
         WID_SCR   = common.n_psk(8, np.concatenate([WID_PN   for _ in range(5)]))[:len(WID_SYMB)]
 
-        self._fixed_s = np.array(zip(SYNC_SCR*SYNC_SYMB,
+        self._fixed_s = common.make_scr(SYNC_SCR*SYNC_SYMB,
-                                     SYNC_SCR),
+                                        SYNC_SCR)
-                                 common.SYMB_SCRAMBLE_DTYPE)
+        self._cnt_s   = common.make_scr(CNT_SCR*CNT_SYMB,
-        self._cnt_s   = np.array(zip(CNT_SCR*CNT_SYMB,
+                                        CNT_SCR)
-                                     CNT_SCR),
+        self._wid_s   = common.make_scr(WID_SCR*WID_SYMB,
-                               common.SYMB_SCRAMBLE_DTYPE)
+                                        WID_SCR)
-        self._wid_s   = np.array(zip(WID_SCR*WID_SYMB,
-                                     WID_SCR),
-                                 common.SYMB_SCRAMBLE_DTYPE)
-
 
     def decode_soft_dec(self, soft_dec):
         print('decode_soft_dec', len(soft_dec), soft_dec.dtype)

python/physical_layer/common.py

@@ -6,7 +6,19 @@ CONST_DTYPE=np.dtype([('points',  np.complex64),
                       ('symbols', np.int32)])
 
 SYMB_SCRAMBLE_DTYPE=np.dtype([('symb',     np.complex64),
-                              ('scramble', np.complex64)])
+                              ('scramble', np.complex64),
+                              ('scramble_xor', np.uint8)])
+
+def make_scr(s1, s2=None, s3=None):
+    a = np.zeros(len(s1), SYMB_SCRAMBLE_DTYPE)
+    a['symb'][:] = s1
+    if s2 is not None:
+        assert(len(s2) == len(s1))
+        a['scramble'][:] = s2
+    if s3 is not None:
+        assert(len(s3) == len(s1))
+        a['scramble_xor'][:] = s3
+    return a
 
 def n_psk(n,x):
     """n-ary PSK constellation"""

python/physical_layer_driver.py

@@ -60,7 +60,7 @@ class physical_layer_driver(gr.hier_block2):
         self._corr_est           = digital.corr_est_cc(symbols    = (preamble_samples.tolist()),
                                                        sps        = sps,
                                                        mark_delay = preamble_offset,
-                                                       threshold  = 0.5,
+                                                       threshold  = 0.3,
                                                        threshold_method = 1)
         self._doppler_correction = digitalhf.doppler_correction_cc(preamble_length, len(preamble_samples))
         self._adaptive_filter    = digitalhf.adaptive_dfe(sps, nB, nF, nW, mu, alpha)