Makmur,
gnuradio and python cannot read from matlab .mat files directly. If you want
to construct a signal in Matlab then you need to use the
write_float_binary() function provided in
gnuradio-core/src/utils/write_float_binary.m. There are other files in there
in case you want a different format. You will need to modify the files a bit
since they are written to work with Octave.
Another approach is to load the variables as vectors from a .mat files using
the loadmat function provided in python's scipy.io library and use a vector
source. For this case your code will look something like. I have loaded
variables from .mat files (filter taps etc) previously, but never used them
as sources so that part is something you will have test.
from gnuradio import gr
from scipy.io import loadmat
variablelist = loadmat('/path/matfile.mat')
var1 = variablelist['var1name'].tolist()
Karthik
On Sat, Mar 20, 2010 at 9:32 AM, Makmur Hidayat <makm...@gmail.com> wrote:
> 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)
>
>
>
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> Discuss-gnuradio@gnu.org
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>
>
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