Hi Ali - I think if you search the GNU Radio discussion list you'll
find some references similar to what you want to do. As a quick
reply: If you want to monitor the channel using the same Tx/Rx
antenna and Flex board, then you have 2 choices:
(1) Do simultaneous Tx and Rx: You'll need to setup a "feedback" loop
in GNU Radio that cancels the Tx signal from the Rx signal, in order
to actively monitor the Rx signal. There are 2 primary issues with
this method:
(a) best receiver sensitivity you'll get is maybe 30 dB off of what
the USRP is capable -- so, maybe 50 dB dynamic range if you're really
lucky, and probably less. Meaning: a "weak" signal (but, one which
would normally be detectable) will be masked and be undetectable due
to the signal processing and other losses in this system (software and
hardware based losses). If that's OK, then there's the other issue:
(b) GNU Radio doesn't do feedback loops of this sort -- someone
correct me if I'm wrong.
(2) switch between Tx and Rx, but not do both simultaneously. There
is significant ongoing work in this field.
Good luck. - MLD
On May 2, 2010, at 8:26 AM, Muhammad Ali Khan wrote:
I am using Flex900 daughter board with USRP board. I am using TX/RX
port for the transmission and for channel sensing, is it possible to
do reception process simultaneously so that i can receive what i am
transmitting.... Please help me this, and If not then give me a good
reason that what are the factors creating hurdles in this.
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