Full DUplex on USRP N200 SBX

GNU Radio
1

Hi,

I intend to transmit and receive full duplex using my USRP N200 SBX on 2
FDM basis. I have one transmit python script which could transmit m-seq
LFSR data stream which is working perfectly.

I have combined it with the uhd_rx_cfile.py by having 2 instances of the
parent class gr.top_block.

I have few queries which is why I am not able to get any output:

  1. I have attached 2 antennas. How do I address each one of them? or how
    Do
    i address each sub devices? Which one should be TX/RX or RX2.

  2. By passing 2 frequency arguments, I am not able to separate 2
    frequencies - one transmit one receive. Even if I change the OptParse
    statements, it has the ‘-f’ notation clashing between tx and rx
    flowgraphs.
    Following is my OptParse Statements-

def get_options():
usage="%prog: [options]"
parser = OptionParser(option_class=eng_option, usage=usage)
#parser.add_option("-S", “–save”, type=“string”, default=None,
help=“Save
pulse shape, m-seq, and other info to file SAVE.m”)
parser.add_option("-c", “–chip-rate”, type=“eng_float”,
default=1e6,help=“set chip rate [default=%default]”)
parser.add_option("-d", “–degree”, type=“eng_float”,
default=7,help=“degree of LFSR, [default=%default]”)
parser.add_option("-x", “–excess-bw”, type=“eng_float”,
default=0.5,help=“set excess BW/ roll-off factor, [default=%default]”)
parser.add_option("-a", “–args”, type=“string”, default="",help=“UHD
device address args , [default=%default]”)
#parser.add_option("-a", “–args_tx”, type=“string”,
default="",help=“UHD
device address args , [default=%default]”)
parser.add_option("", “–spec”, type=“string”,
default=None,help=“Subdevice
of UHD device where appropriate”)
parser.add_option("", “–antenna”, type=“string”,
default=None,help=“select
Antenna where appropriate”)
parser.add_option("", “–freq_rx”, type=“eng_float”,
default=None,help=“set
Receiver frequency to FREQ”, metavar=“FREQ”)
parser.add_option("", “–freq_tx”, type=“eng_float”,
default=None,help=“set
transmitter frequency to FREQ”, metavar=“FREQ”)
parser.add_option("-g", “–gain”, type=“eng_float”,
default=0.0,help=“set
gain in dB, [default=%default]”)
parser.add_option("-N", “–nsamples”, type=“eng_float”, default=None,
help=“number of samples to collect [default=+inf]”)
parser.add_option("", “–otw-format”, type=“string”,
default=“sc16”,help=“set over-the-wire format to USRP
[default=%default]”)
parser.add_option("", “–fullscale”, type=“eng_float”,
default=1.0,help=“set full scale value for complex32 format
[default=%default]”)
(options, args) = parser.parse_args ()
if len(args)!=1:
parser.print_help()
raise SystemExit, 1

if options.freq_rx is None:
parser.print_help()
sys.stderr.write(‘You must specify the Receiver frequency with
-f_rx FREQ\n’);
raise SystemExit, 1
if options.freq_tx is None:
parser.print_help()
sys.stderr.write(‘You must specify the Transmit frequency with
-f_tx FREQ\n’);
raise SystemExit, 1