On 02/26/2016 12:58 PM, Martin Braun wrote:
Everyone who implements half duplex modems runs into this issue sooner
or later. A simple fix is to catch this in software, e.g. On your Mac
layer by filtering for your own transmit Mac address (or whatever
equivalent you have in your protocol). You can also cache the
timestamps of your tx packets and use that to ignore rx packets.
Cheers
Martin
That's precisely what our MAC layer used to do on packet radio, as I
recall--ignore any packet that has our own MAC address in the
source field.
On 26 Feb 2016 07:25, "Marcus D. Leech" <mle...@ripnet.com
<mailto:mle...@ripnet.com>> wrote:
On 02/26/2016 07:00 AM, Alex Weihkopf wrote:
Hello,
I am using two USRP2 + WBX connected via cable on the TX/RX
antenna ports. I want to use them for my GNURadio OFDM-project in
half-duplex mode.
*Problem*: Whenever I send a data-packet (~10ms) on the TX-chain
of one USRP2, I receive the same packet on the RX-chain of the
same USRP2. The transmitter receives its own packets.
Why is that? Insufficient Decoupling between Receive and
Transmit Circuit?
Does the USRP2 internally turn off the Receive Circuit when the
Transmit Circuit has data to send? Or does it just disconnect the
Receive Circuit from the antenna?
Is there a comprehensible GNURadio example for USRP2 + WBX
in half-duplex-mode?
Regards,
Alex
The RX chain is not disabled, only switched-away from the TX/RX
antenna. There's about 40+dB of isolation between the two sides,
but that still produces a fair amount of signal at the RX. The
best way forward is to simply ignore RX traffic while you're TXing.
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