[Discuss-gnuradio] Decoding of a transmit signal file from matlab

[Makmur Hidayat]

Hi,

 

I try to demodulate a file of a transmit signal file (from matlab). But I can not get the correct message. Therefore I need your suggestion.

 

Below is the code

 

Thanks

Makmur

 

#!/usr/bin/env python

from gnuradio import gr
from gnuradio.eng_option import eng_option
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import wx

class coba_demod(grc_wxgui.top_block_gui):

 def __init__(self):
  grc_wxgui.top_block_gui.__init__(self, title="Demodulasi transmit signal")

  ##################################################
  # Variables
  ##################################################
  self.samp_rate = samp_rate = 32000

  ##################################################
  # Blocks
  ##################################################
  self.gr_diff_decoder_bb_0 = gr.diff_decoder_bb(5)
  self.gr_file_sink_0 = gr.file_sink(gr.sizeof_char*1, "/home/makmur/datacoba")
  self.gr_file_source_0 = gr.file_source(gr.sizeof_char*1, "/home/makmur/transmit_signal.mat", False)
  self.gr_throttle_0 = gr.throttle(gr.sizeof_char*1, samp_rate)

  ##################################################
  # Connections
  ##################################################
  self.connect((self.gr_file_source_0, 0), (self.gr_throttle_0, 0))
  self.connect((self.gr_throttle_0, 0), (self.gr_diff_decoder_bb_0, 0))
  self.connect((self.gr_diff_decoder_bb_0, 0), (self.gr_file_sink_0, 0))

 def set_samp_rate(self, samp_rate):
  self.samp_rate = samp_rate

if __name__ == '__main__':
 parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
 (options, args) = parser.parse_args()
 tb = coba_demod()
 tb.Run(True)