From 5d69a524f81f234b3fbc41d49ba18d6f6886baba Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Thu, 3 Aug 2006 04:51:51 +0000
Subject: Houston, we have a trunk.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/gmsk2/gmsk_test.py | 115 ++++++++++++++++++++++++++++
1 file changed, 115 insertions(+)
create mode 100755 gnuradio-examples/python/gmsk2/gmsk_test.py
(limited to 'gnuradio-examples/python/gmsk2/gmsk_test.py')
diff --git a/gnuradio-examples/python/gmsk2/gmsk_test.py b/gnuradio-examples/python/gmsk2/gmsk_test.py
new file mode 100755
index 0000000000..7ae69a0a94
--- /dev/null
+++ b/gnuradio-examples/python/gmsk2/gmsk_test.py
@@ -0,0 +1,115 @@
+#!/usr/bin/env python
+
+from gnuradio import gr, blks
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+import random
+import struct
+
+#import os
+#print os.getpid()
+#raw_input('Attach and press enter')
+
+
+class my_graph(gr.flow_graph):
+
+ def __init__(self, rx_callback, spb, bt, SNR, freq_error):
+ gr.flow_graph.__init__(self)
+
+ fg = self
+
+ # Tuning Parameters
+ gain_mu = 0.002*spb
+ omega = spb*(1+freq_error)
+
+ # transmitter
+ self.packet_transmitter = blks.gmsk2_mod_pkts(fg, spb=spb, bt=bt)
+
+ # add some noise
+ add = gr.add_cc()
+ noise = gr.noise_source_c(gr.GR_GAUSSIAN, pow(10.0,-SNR/20.0))
+
+ # channel filter
+ rx_filt_taps = gr.firdes.low_pass(1,spb,0.8,0.1,gr.firdes.WIN_HANN)
+ rx_filt = gr.fir_filter_ccf(1,rx_filt_taps)
+
+ # receiver
+ self.packet_receiver = blks.gmsk2_demod_pkts(fg, callback=rx_callback,
+ spb=spb, gain_mu=gain_mu,
+ freq_error=freq_error, omega=omega)
+
+ fg.connect (self.packet_transmitter, (add,0))
+ fg.connect (noise, (add,1))
+ fg.connect(add, rx_filt, self.packet_receiver)
+
+
+class stats(object):
+ def __init__(self):
+ self.npkts = 0
+ self.nright = 0
+
+def main():
+ st = stats()
+
+ def send_pkt(payload='', eof=False):
+ fg.packet_transmitter.send_pkt(payload, eof)
+
+ def rx_callback(ok, payload):
+ st.npkts += 1
+ if ok:
+ st.nright += 1
+ if len(payload) <= 16:
+ print "ok = %5r payload = '%s' %d/%d" % (ok, payload, st.nright, st.npkts)
+ else:
+ (pktno,) = struct.unpack('!H', payload[0:2])
+ print "ok = %5r pktno = %4d len(payload) = %4d %d/%d" % (ok, pktno, len(payload),
+ st.nright, st.npkts)
+
+
+ parser = OptionParser (option_class=eng_option)
+ parser.add_option("-M", "--megabytes", type="eng_float", default=1,
+ help="set megabytes to transmit [default=%default]")
+ parser.add_option("-s", "--size", type="eng_float", default=1500,
+ help="set packet size [default=%default]")
+ parser.add_option("","--spb", type=int, default=4,
+ help="set samples per baud to SPB [default=%default]")
+ parser.add_option("", "--bt", type="eng_float", default=0.3,
+ help="set bandwidth time product for Gaussian filter [default=%default]")
+ parser.add_option("", "--snr", type="eng_float", default=20,
+ help="set SNR in dB for simulation [default=%default]")
+ parser.add_option("", "--freq-error", type="eng_float", default=0,
+ help="set frequency error for simulation [default=%default]")
+ (options, args) = parser.parse_args ()
+
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ pkt_size = int(options.size)
+
+ fg = my_graph(rx_callback, options.spb, options.bt, options.snr, options.freq_error)
+ fg.start()
+
+ nbytes = int(1e6 * options.megabytes)
+ n = 0
+ pktno = 0
+
+ send_pkt('Hello World')
+
+ # generate and send packets
+ while n < nbytes:
+ send_pkt(struct.pack('!H', pktno) + (pkt_size - 2) * chr(pktno & 0xff))
+ n += pkt_size
+ pktno += 1
+
+ send_pkt('Goodbye World')
+ send_pkt(eof=True) # tell modulator we're not sending any more pkts
+
+ fg.wait()
+
+
+if __name__ == '__main__':
+ try:
+ main()
+ except KeyboardInterrupt:
+ pass
--
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