On 01/26/2018 07:54 PM, Weihan Chen via USRP-users wrote:
Hi,
I'm doing OFDM TX/RX on a pair of USRPs N210 with SBX. Here is my
device list:
USRP A, Antenna port: TX/RX
USRP B, Antenna port: TX/RX
USRP C, Antenna port: TX/RX
For A->C, A->B and C->B, it works fine. But, B->C, I can not decode
the OFDM symbols. The antennas are placed roughly 50cm apart. On USRP
B,I also tried using TX/RX port to transmit and RX2 port to receive
and it worked fine. This doesn't make sense to me. What might be the
possible reasons for the B->C failure? Please help! Thanks.
Best,
Weihan
Does a straight CW (continuous tone) transmission appear "correct" from
B-->C ??
My guess is that your OFDM implementation doesn't have frequency-offset
correction, or an algorithm that isn't sufficiently robust.
Also, check you gain settings--make sure the RX isn't being over-driven
by the very-close antennae.
These are all very-basic debugging techniques when debugging RF systems,
and until you have something "basic" working properly, debugging your
system with something as complex as OFDM might not be the best approach.
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