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   1 #
   2 # Copyright 2008 Free Software Foundation, Inc.
   3 #
   4 # This file is part of GNU Radio
   5 #
   6 # GNU Radio is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3, or (at your option)
   9 # any later version.
  10 #
  11 # GNU Radio is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with GNU Radio; see the file COPYING.  If not, write to
  18 # the Free Software Foundation, Inc., 51 Franklin Street,
  19 # Boston, MA 02110-1301, USA.
  20 #
  21
  22 ##################################################
  23 # Imports
  24 ##################################################
  25 import const_window
  26 import common
  27 from gnuradio import gr, blks2
  28 from pubsub import pubsub
  29 from constants import *
  30
  31 ##################################################
  32 # Constellation sink block (wrapper for old wxgui)
  33 ##################################################
  34 class const_sink_c(gr.hier_block2):
  35         """
  36         A constellation block with a gui window.
  37         """
  38
  39         def __init__(
  40                 self,
  41                 parent,
  42                 title='',
  43                 sample_rate=1,
  44                 size=const_window.DEFAULT_WIN_SIZE,
  45                 frame_rate=const_window.DEFAULT_FRAME_RATE,
  46                 const_size=const_window.DEFAULT_CONST_SIZE,
  47                 #mpsk recv params
  48                 M=4,
  49                 theta=0,
  50                 alpha=0.005,
  51                 fmax=0.06,
  52                 mu=0.5,
  53                 gain_mu=0.005,
  54                 symbol_rate=1,
  55                 omega_limit=0.005,
  56         ):
  57                 #init
  58                 gr.hier_block2.__init__(
  59                         self,
  60                         "const_sink",
  61                         gr.io_signature(1, 1, gr.sizeof_gr_complex),
  62                         gr.io_signature(0, 0, 0),
  63                 )
  64                 #blocks
  65                 sd = blks2.stream_to_vector_decimator(
  66                         item_size=gr.sizeof_gr_complex,
  67                         sample_rate=sample_rate,
  68                         vec_rate=frame_rate,
  69                         vec_len=const_size,
  70                 )
  71                 beta = .25*alpha**2 #redundant, will be updated
  72                 fmin = -fmax
  73                 gain_omega = .25*gain_mu**2 #redundant, will be updated
  74                 omega = 1 #set_sample_rate will update this
  75                 # Costas frequency/phase recovery loop
  76                 # Critically damped 2nd order PLL
  77                 self._costas = gr.costas_loop_cc(alpha, beta, fmax, fmin, M)
  78                 # Timing recovery loop
  79                 # Critically damped 2nd order DLL
  80                 self._retime = gr.clock_recovery_mm_cc(omega, gain_omega, mu, gain_mu, omega_limit)
  81                 #sync = gr.mpsk_receiver_cc(
  82                 #       M, #psk order
  83                 #       theta,
  84                 #       alpha,
  85                 #       beta,
  86                 #       fmin,
  87                 #       fmax,
  88                 #       mu,
  89                 #       gain_mu,
  90                 #       omega,
  91                 #       gain_omega,
  92                 #       omega_limit,
  93                 #)
  94                 agc = gr.feedforward_agc_cc(16, 1)
  95                 msgq = gr.msg_queue(2)
  96                 sink = gr.message_sink(gr.sizeof_gr_complex*const_size, msgq, True)
  97                 #connect
  98                 self.connect(self, self._costas, self._retime, agc, sd, sink)
  99                 #controller
 100                 def setter(p, k, x): p[k] = x
 101                 self.controller = pubsub()
 102                 self.controller.subscribe(ALPHA_KEY, self._costas.set_alpha)
 103                 self.controller.publish(ALPHA_KEY, self._costas.alpha)
 104                 self.controller.subscribe(BETA_KEY, self._costas.set_beta)
 105                 self.controller.publish(BETA_KEY, self._costas.beta)
 106                 self.controller.subscribe(GAIN_MU_KEY, self._retime.set_gain_mu)
 107                 self.controller.publish(GAIN_MU_KEY, self._retime.gain_mu)
 108                 self.controller.subscribe(OMEGA_KEY, self._retime.set_omega)
 109                 self.controller.publish(OMEGA_KEY, self._retime.omega)
 110                 self.controller.subscribe(GAIN_OMEGA_KEY, self._retime.set_gain_omega)
 111                 self.controller.publish(GAIN_OMEGA_KEY, self._retime.gain_omega)
 112                 self.controller.subscribe(SAMPLE_RATE_KEY, sd.set_sample_rate)
 113                 self.controller.subscribe(SAMPLE_RATE_KEY, lambda x: setter(self.controller, OMEGA_KEY, float(x)/symbol_rate))
 114                 self.controller.publish(SAMPLE_RATE_KEY, sd.sample_rate)
 115                 #initial update
 116                 self.controller[SAMPLE_RATE_KEY] = sample_rate
 117                 #start input watcher
 118                 common.input_watcher(msgq, self.controller, MSG_KEY)
 119                 #create window
 120                 self.win = const_window.const_window(
 121                         parent=parent,
 122                         controller=self.controller,
 123                         size=size,
 124                         title=title,
 125                         msg_key=MSG_KEY,
 126                         alpha_key=ALPHA_KEY,
 127                         beta_key=BETA_KEY,
 128                         gain_mu_key=GAIN_MU_KEY,
 129                         gain_omega_key=GAIN_OMEGA_KEY,
 130                         omega_key=OMEGA_KEY,
 131                         sample_rate_key=SAMPLE_RATE_KEY,
 132                 )
 133                 common.register_access_methods(self, self.win)
 134
 135