1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
#!/usr/bin/env python2
# -*- coding: utf8 -*-
# Andreas Müller, 2008
# andrmuel@ee.ethz.ch
#
# this code may be freely used under GNU GPL conditions
"""
send DAB with USRP
"""
from gnuradio import gr, uhd, blocks
from gnuradio.eng_option import eng_option
import gnuradio.dab as grdab
from optparse import OptionParser
import sys
class usrp_dab_tx(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
parser = OptionParser(option_class=eng_option, usage="%prog: [options] input-filename")
parser.add_option("-T", "--tx-subdev-spec", type="subdev", default=(0, 0),
help="select USRP Tx side A or B [default=A]")
parser.add_option("-f", "--freq", type="eng_float", default=227.36e6,
help="set frequency to FREQ [default=%default]")
parser.add_option("-g", "--tx-gain", type="eng_float", default=None,
help="set transmit gain in dB (default is midpoint)")
parser.add_option('-v', '--verbose', action="store_true", default=False,
help="verbose output")
parser.add_option('-a', '--antenna', type="string", default="TX/RX",
help="select antenna")
(options, args) = parser.parse_args ()
if len(args)!=1:
parser.print_help()
sys.exit(1)
else:
self.filename = args[0]
# if gr.enable_realtime_scheduling() != gr.RT_OK:
# print "-> failed to enable realtime scheduling"
interp = 64
self.sample_rate = 128e6/interp
self.dab_params = grdab.parameters.dab_parameters(mode=1, sample_rate=2000000, verbose=options.verbose)
self.src = blocks.file_source(gr.sizeof_char, self.filename)
self.trigsrc = blocks.vector_source_b([1]+[0]*(self.dab_params.symbols_per_frame-1),True)
self.s2v = blocks.stream_to_vector(gr.sizeof_char, 384)
self.mod = grdab.ofdm_mod(self.dab_params, verbose=options.verbose)
#self.sink = usrp.sink_c(interp_rate = interp)
self.sink = uhd.usrp_sink("",uhd.io_type.COMPLEX_FLOAT32,1)
self.sink.set_samp_rate(self.sample_rate)
#self.sink.set_mux(usrp.determine_tx_mux_value(self.sink, options.tx_subdev_spec))
#self.subdev = usrp.selected_subdev(self.sink, options.tx_subdev_spec)
self.sink.set_antenna(options.antenna)
print "--> using sample rate: " + str(self.sample_rate)
self.connect(self.src, self.s2v, self.mod, self.sink)
self.connect(self.trigsrc, (self.mod,1))
# tune frequency
self.sink.set_center_freq(options.freq)
# set gain
if options.tx_gain is None:
# if no gain was specified, use the mid-point in dB
g = self.sink.get_gain_range()
options.tx_gain = float(g.start()+g.stop())/2
self.sink.set_gain(options.tx_gain)
if __name__=='__main__':
try:
usrp_dab_tx().run()
except KeyboardInterrupt:
pass
|
