Merged r4518:5130 from developer branch n4hy/ofdm into trunk, passes distcheck.

Adds incomplete OFDM implementation, further work to be completed in the features/ofdm branch. git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5131 221aa14e-8319-0410-a670-987f0aec2ac5
author: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> 2007-04-26 22:51:48 +0000
committer: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> 2007-04-26 22:51:48 +0000
commit: 43819f0f33498239970b4479684f12aa080859e6 (patch)
tree: cb48bd98bde120d4b9c9d098414f7a25cf9b41fd /gnuradio-examples/python/ofdm/benchmark_ofdm.py
parent: c6baf9d41d452965fe6af642b61b2bb823dcf9ea (diff)
1 files changed, 193 insertions, 0 deletions
diff --git a/gnuradio-examples/python/ofdm/benchmark_ofdm.py b/gnuradio-examples/python/ofdm/benchmark_ofdm.py
new file mode 100755
index 0000000000..3b4761d5ee
--- /dev/null
+++ b/gnuradio-examples/python/ofdm/benchmark_ofdm.py
@@ -0,0 +1,193 @@
+#!/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 usrp
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+import random, time, struct, sys, math, os
+
+# from current dir
+from transmit_path import transmit_path
+from receive_path import receive_path
+import ofdm
+
+class awgn_channel(gr.hier_block):
+    def __init__(self, fg, sample_rate, noise_voltage, frequency_offset):
+
+        self.input = gr.add_const_cc(0)
+
+        self.noise_adder = gr.add_cc()
+        self.noise = gr.noise_source_c(gr.GR_GAUSSIAN,noise_voltage)
+        self.offset = gr.sig_source_c(1, gr.GR_SIN_WAVE, frequency_offset, 1.0, 0.0)
+        self.mixer_offset = gr.multiply_cc()
+
+        fg.connect(self.input, (self.mixer_offset,0))
+        fg.connect(self.offset,(self.mixer_offset,1))
+        fg.connect(self.mixer_offset, (self.noise_adder,1))
+        fg.connect(self.noise, (self.noise_adder,0))
+
+        gr.hier_block.__init__(self, fg, self.input, self.noise_adder)
+
+class multipath_channel(gr.hier_block):
+    def __init__(self, fg):
+
+        self.taps = [1.0, .2, 0.0, .1, .08, -.4, .12, -.2, 0, 0, 0, .3]
+        self.chan = gr.fir_filter_ccc(1, self.taps)
+        
+        gr.hier_block.__init__(self, fg, self.chan, self.chan)
+
+class my_graph(gr.flow_graph):
+    def __init__(self, callback, options):
+        gr.flow_graph.__init__(self)
+
+        channel_on = True
+
+        SNR = 10.0**(options.snr/10.0)
+        frequency_offset = options.frequency_offset / options.fft_length
+        
+        power_in_signal = options.occupied_tones
+        noise_power_in_channel = power_in_signal/SNR
+        noise_power_required = noise_power_in_channel * options.fft_length / options.occupied_tones
+        noise_voltage = math.sqrt(noise_power_required)
+
+        self.txpath = transmit_path(self, options)
+        self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate)
+        self.rxpath = receive_path(self, callback, options)
+
+        if channel_on:
+            self.channel = awgn_channel(self, options.sample_rate, noise_voltage, frequency_offset)
+            self.multipath = multipath_channel(self)
+
+            if options.discontinuous:
+                z = 20000*[0,]
+                self.zeros = gr.vector_source_c(z, True)
+                packet_size = 15*((4+8+4+1500+4) * 8)
+                self.mux = gr.stream_mux(gr.sizeof_gr_complex, [packet_size-0, int(10e5)])
+
+                # Connect components
+                self.connect(self.txpath, (self.mux,0))
+                self.connect(self.zeros, (self.mux,1))
+                self.connect(self.mux, self.throttle, self.channel, self.rxpath)
+                self.connect(self.mux, gr.file_sink(gr.sizeof_gr_complex, "tx_ofdm.dat"))
+
+            else:
+                #self.connect(self.txpath, self.throttle, self.multipath, self.channel)
+                self.connect(self.txpath, self.throttle, self.channel)
+                self.connect(self.channel, self.rxpath)
+                self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "tx_ofdm.dat"))
+            
+        else:
+            self.connect(self.txpath, self.throttle, self.rxpath)
+            self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "tx"))
+            self.connect(self.rxpath.ofdm_demod.ofdm_rx, gr.file_sink(options.fft_length*gr.sizeof_gr_complex, "rx"))
+
+
+# /////////////////////////////////////////////////////////////////////////////
+#                                   main
+# /////////////////////////////////////////////////////////////////////////////
+
+def main():
+    global n_rcvd, n_right
+        
+    n_rcvd = 0
+    n_right = 0
+        
+    def send_pkt(payload='', eof=False):
+        return fg.txpath.send_pkt(payload, eof)
+        
+    def rx_callback(ok, payload):
+        global n_rcvd, n_right
+        n_rcvd += 1
+        (pktno,) = struct.unpack('!H', payload[0:2])
+        if ok:
+            n_right += 1
+        print "ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d" % (ok, pktno, n_rcvd, n_right)
+                
+    parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
+    expert_grp = parser.add_option_group("Expert")
+    parser.add_option("-s", "--size", type="eng_float", default=1450,
+                      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("-r", "--sample-rate", type="eng_float", default=1e5,
+                      help="set sample rate to RATE (%default)") 
+    parser.add_option("", "--snr", type="eng_float", default=30,
+                      help="set the SNR of the channel in dB [default=%default]")
+    parser.add_option("", "--frequency-offset", type="eng_float", default=0,
+                      help="set frequency offset introduced by channel [default=%default]")
+    parser.add_option("","--discontinuous", action="store_true", default=False,
+                      help="enable discontinous transmission (bursts of 5 packets)")
+
+    transmit_path.add_options(parser, expert_grp)
+    receive_path.add_options(parser, expert_grp)
+    ofdm.ofdm_mod.add_options(parser, expert_grp)
+    ofdm.ofdm_demod.add_options(parser, expert_grp)
+    
+    (options, args) = parser.parse_args ()
+
+    if(options.mtu < options.size):
+        sys.stderr.write("MTU (%.0f) must be larger than the packet size (%.0f)\n"
+                         % (options.mtu, options.size))
+        sys.exit(1)
+        
+    # build the graph
+    fg = my_graph(rx_callback, options)
+    
+    r = gr.enable_realtime_scheduling()
+    #    if r != gr.RT_OK:
+    #        print "Warning: failed to enable realtime scheduling"
+        
+    fg.start()                       # start flow graph
+    
+    # generate and send packets
+    nbytes = int(1e6 * options.megabytes)
+    n = 0
+    pktno = 0
+    pkt_size = int(options.size)
+
+    
+    
+    while n < nbytes:
+        r = ''.join([chr(random.randint(0,255)) for i in range(pkt_size-2)])
+        #pkt_contents = struct.pack('!H', pktno) + (pkt_size - 2) * chr(pktno & 0xff)
+        pkt_contents = struct.pack('!H', pktno) + r
+        send_pkt(pkt_contents)
+        n += pkt_size
+        #sys.stderr.write('.')
+        #if options.discontinuous and pktno % 5 == 4:
+        #    time.sleep(1)
+        pktno += 1
+        
+    send_pkt(eof=True)
+    fg.wait()                       # wait for it to finish
+
+
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass
+
+
author	jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>	2007-04-26 22:51:48 +0000
committer	jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>	2007-04-26 22:51:48 +0000
commit	43819f0f33498239970b4479684f12aa080859e6 (patch)
tree	cb48bd98bde120d4b9c9d098414f7a25cf9b41fd /gnuradio-examples/python/ofdm/benchmark_ofdm.py
parent	c6baf9d41d452965fe6af642b61b2bb823dcf9ea (diff)