From 3d271a927940df0d7368c774c0e1ed0881e6d493 Mon Sep 17 00:00:00 2001
From: Piotr Krysik <perper@o2.pl>
Date: Thu, 28 May 2009 20:27:13 +0200
Subject: added new python script gsm_receive

---
 src/python/gsm_receive.py | 108 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100755 src/python/gsm_receive.py

(limited to 'src/python')

diff --git a/src/python/gsm_receive.py b/src/python/gsm_receive.py
new file mode 100755
index 0000000..449f7d8
--- /dev/null
+++ b/src/python/gsm_receive.py
@@ -0,0 +1,108 @@
+#!/usr/bin/env python
+#!/usr/bin/env python
+
+from gnuradio import gr, gru, blks2
+#, gsm
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from os import sys
+
+for extdir in ['../../debug/src/lib','../../debug/src/lib/.libs']:
+    if extdir not in sys.path:
+        sys.path.append(extdir)
+import gsm                        
+
+class tune(gr.feval_dd):
+    def __init__(self, top_block):
+        gr.feval_dd.__init__(self)
+        self.top_block = top_block
+        # self.center_freq = 0
+    def eval(self, freq_offet):
+        # self.center_freq = self.center_freq - freq_offet
+        self.top_block.set_frequency(freq_offet)
+        return freq_offet
+
+class gsm_receiver_first_blood(gr.top_block):
+    def __init__(self):
+        gr.top_block.__init__(self)
+        (options, args) = self._przetworz_opcje()
+        self.tune_callback = tune(self)
+        self.options    = options
+        self.args       = args
+        self._ustaw_taktowanie()
+        self.zrodlo = self._ustaw_zrodlo()
+        self.filtr = self._ustaw_filtr()
+        self.interpolator = self._ustaw_interpolator()
+        self.odbiornik = self._ustaw_odbiornik()
+        self.konwerter = self._ustaw_konwerter()
+        self.ujscie = self._ustaw_ujscie()
+    
+        self.connect(self.zrodlo, self.filtr,  self.interpolator, self.odbiornik, self.konwerter, self.ujscie)
+#       self.connect(self.zrodlo, self.ujscie)
+  
+    def _ustaw_ujscie(self):
+        nazwa_pliku_wy = self.options.outputfile
+        ujscie = gr.file_sink(gr.sizeof_float, nazwa_pliku_wy)
+        return ujscie
+    
+    def _ustaw_zrodlo(self):
+        nazwa_pliku = self.options.inputfile
+        zrodlo = gr.file_source(gr.sizeof_gr_complex, nazwa_pliku, False)
+        return zrodlo
+    
+    def _ustaw_taktowanie(self):
+        options = self.options
+        clock_rate = 64e6
+        self.clock_rate = clock_rate
+        self.input_rate = clock_rate / options.decim
+        self.gsm_symb_rate = 1625000.0 / 6.0
+        self.sps = self.input_rate / self.gsm_symb_rate / self.options.osr
+
+    def _ustaw_filtr(self):
+        filter_cutoff   = 145e3	
+        filter_t_width  = 10e3
+        offset = 0
+#        print "input_rate:", self.input_rate, "sample rate:", self.sps, " filter_cutoff:", filter_cutoff, " filter_t_width:", filter_t_width
+        filter_taps     = gr.firdes.low_pass(1.0, self.input_rate, filter_cutoff, filter_t_width, gr.firdes.WIN_HAMMING)
+        filtr          = gr.freq_xlating_fir_filter_ccf(1, filter_taps, offset, self.input_rate)
+        return filtr
+
+    def _ustaw_konwerter(self):
+        v2s = gr.vector_to_stream(gr.sizeof_float, 142)
+        return v2s
+    
+    def _ustaw_interpolator(self):
+        interpolator = gr.fractional_interpolator_cc(0, self.sps) 
+#	interpolator = blks2.rational_resampler_ccf(13, 6)
+        return interpolator
+    
+    def _ustaw_odbiornik(self):
+        odbiornik = gsm.receiver_cf(self.tune_callback, self.options.osr)
+        return odbiornik
+    
+    def _przetworz_opcje(self):
+        parser = OptionParser(option_class=eng_option)
+        parser.add_option("-d", "--decim", type="int", default=128,
+                          help="Set USRP decimation rate to DECIM [default=%default]")
+        parser.add_option("-r", "--osr", type="int", default=4,
+                          help="Oversampling ratio [default=%default]")
+        parser.add_option("-I", "--inputfile", type="string", default="cfile",
+                          help="Input filename")
+        parser.add_option("-O", "--outputfile", type="string", default="cfile2.out",
+                          help="Output filename")
+        (options, args) = parser.parse_args ()
+        return (options, args)
+    
+    def set_frequency(self, center_freq):
+        self.filtr.set_center_freq(center_freq)
+
+def main():
+    try:
+        gsm_receiver_first_blood().run()
+    except KeyboardInterrupt:
+        pass
+
+if __name__ == '__main__':
+    main()
+
+
-- 
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