merged trondeau/digital-wip2 r4193:4730 into trunk - improves digital receiver and fixes ticket:72

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4731 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 185 insertions, 0 deletions

diff --git a/gnuradio-examples/python/digital/benchmark_loopback.py b/gnuradio-examples/python/digital/benchmark_loopback.py
new file mode 100755
index 000000000..d036f63aa
--- /dev/null
+++ b/gnuradio-examples/python/digital/benchmark_loopback.py
@@ -0,0 +1,185 @@
+#!/usr/bin/env python
+#!/usr/bin/env python
+#
+# Copyright 2005, 2006 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+from gnuradio import gr, gru, modulation_utils
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+import random, time, struct, sys, math
+
+# from current dir
+from transmit_path_lb import transmit_path
+from receive_path_lb import receive_path
+import fusb_options
+
+class awgn_channel(gr.hier_block):
+    def __init__(self, fg, sample_rate, noise_voltage, frequency_offset, seed=False):
+        self.input = gr.add_const_cc(0) # dummy input device
+        
+        # Create the Gaussian noise source
+        if not seed:
+            self.noise = gr.noise_source_c(gr.GR_GAUSSIAN, noise_voltage)
+        else:
+            rseed = int(time.time())
+            self.noise = gr.noise_source_c(gr.GR_GAUSSIAN, noise_voltage, rseed)
+
+        self.adder =  gr.add_cc()
+
+        # Create the frequency offset
+        self.offset = gr.sig_source_c(1, gr.GR_SIN_WAVE,
+                                      frequency_offset, 1.0, 0.0)
+        self.mixer = gr.multiply_cc()
+
+        # Connect the components
+        fg.connect(self.input, (self.mixer, 0))
+        fg.connect(self.offset, (self.mixer, 1))
+        fg.connect(self.mixer, (self.adder, 0))
+        fg.connect(self.noise, (self.adder, 1))
+
+        gr.hier_block.__init__(self, fg, self.input, self.adder)
+
+class my_graph(gr.flow_graph):
+    def __init__(self, mod_class, demod_class, rx_callback, options):
+        gr.flow_graph.__init__(self)
+
+        channelon = True;
+
+        SNR = 10.0**(options.snr/10.0)
+        frequency_offset = options.frequency_offset
+        
+        power_in_signal = abs(options.tx_amplitude)**2
+        noise_power = power_in_signal/SNR
+        noise_voltage = math.sqrt(noise_power)
+
+        self.txpath = transmit_path(self, mod_class, options)
+        self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate)
+        self.rxpath = receive_path(self, demod_class, rx_callback, options)
+
+        if channelon:
+            self.channel = awgn_channel(self, options.sample_rate, noise_voltage, frequency_offset, options.seed)
+
+            # Connect components
+            self.connect(self.txpath, self.throttle, self.channel, self.rxpath)
+        else:
+            # Connect components
+            self.connect(self.txpath, self.throttle, self.rxpath)
+
+
+# /////////////////////////////////////////////////////////////////////////////
+#                                   main
+# /////////////////////////////////////////////////////////////////////////////
+
+def main():
+
+    global n_rcvd, n_right
+
+    n_rcvd = 0
+    n_right = 0
+    
+    def rx_callback(ok, payload):
+        global n_rcvd, n_right
+        (pktno,) = struct.unpack('!H', payload[0:2])
+        n_rcvd += 1
+        if ok:
+            n_right += 1
+
+        print "ok = %5s  pktno = %4d  n_rcvd = %4d  n_right = %4d" % (
+            ok, pktno, n_rcvd, n_right)
+
+    def send_pkt(payload='', eof=False):
+        return fg.txpath.send_pkt(payload, eof)
+
+
+    mods = modulation_utils.type_1_mods()
+    demods = modulation_utils.type_1_demods()
+
+    parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
+    expert_grp = parser.add_option_group("Expert")
+    channel_grp = parser.add_option_group("Channel")
+
+    parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
+                      default='dbpsk',
+                      help="Select modulation from: %s [default=%%default]"
+                            % (', '.join(mods.keys()),))
+
+    parser.add_option("-s", "--size", type="eng_float", default=1500,
+                      help="set packet size [default=%default]")
+    parser.add_option("-M", "--megabytes", type="eng_float", default=1.0,
+                      help="set megabytes to transmit [default=%default]")
+    parser.add_option("","--discontinuous", action="store_true", default=False,
+                      help="enable discontinous transmission (bursts of 5 packets)")
+
+    channel_grp.add_option("", "--sample-rate", type="eng_float", default=1e5,
+                           help="set speed of channel/simulation rate to RATE [default=%default]") 
+    channel_grp.add_option("", "--snr", type="eng_float", default=30,
+                           help="set the SNR of the channel in dB [default=%default]")
+    channel_grp.add_option("", "--frequency-offset", type="eng_float", default=0,
+                           help="set frequency offset introduced by channel [default=%default]")
+    channel_grp.add_option("", "--seed", action="store_true", default=False,
+                           help="use a random seed for AWGN noise [default=%default]")
+
+    transmit_path.add_options(parser, expert_grp)
+    receive_path.add_options(parser, expert_grp)
+
+    for mod in mods.values():
+        mod.add_options(expert_grp)
+    for demod in demods.values():
+        demod.add_options(expert_grp)
+
+    (options, args) = parser.parse_args ()
+
+    if len(args) != 0:
+        parser.print_help()
+        sys.exit(1)
+ 
+    r = gr.enable_realtime_scheduling()
+    if r != gr.RT_OK:
+        print "Warning: failed to enable realtime scheduling"
+        
+    # Create an instance of a hierarchical block
+    fg = my_graph(mods[options.modulation], demods[options.modulation], rx_callback, options)
+    fg.start()
+
+    # generate and send packets
+    nbytes = int(1e6 * options.megabytes)
+    n = 0
+    pktno = 0
+    pkt_size = int(options.size)
+
+    while n < nbytes:
+        send_pkt(struct.pack('!H', pktno) + (pkt_size - 2) * chr(pktno & 0xff))
+        n += pkt_size
+        if options.discontinuous and pktno % 5 == 4:
+            time.sleep(1)
+        pktno += 1
+        
+    send_pkt(eof=True)
+
+    fg.wait()
+    
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass