Hello!
Regarding what you see in trailing, my guess is that this is the step response of the
built-in DC offset cancellation filter; "DC offset cancellation" is high-pass filter
behaviour. This affects only frequencies in your signal that are very low. It is meant to
remove imperfections that happen on every quadrature mixer&ADC device. So, unless you
really see a problem with the signal itself, this is probably fine! You say you have an
issue with this, but don't explain the actual issue.
The phase in that trailing part can remain constant, that's OK. The step response of a
real-valued filter is real, and you should simply see the phase of the last output sample
at the moment of "input switchoff".
Regarding "Amplitude and Signal length": I can't really tell what you're showing us here.
What kind of signal did you feed into the USRP? Where does it come from? At which
frequency? What is the USRP tuned to? What's its sample rate? Most importantly: What is it
that worries you about this? As far as I can tell, this might seem normal, and not an issue!
Best regards,
Marcus
On 11.11.24 14:18, yibinden...@outlook.com wrote:
Hi everyone,
I'm working on a project where I generate a signal and simultaneously receive it using
both the Pluto SDR and the USRP B210. However, I’m running into some unexpected issues
with the B210's reception, and I’m hoping for some guidance.
Here are the main problems I’m encountering:
*Signal Trailing*: As shown in the figures, The signal received by the Pluto has clear
boundaries, while the signal received by the B210 has noticeable trailing compared to
the Pluto.
*Strange Phase Characteristics*: The phase behavior of the B210-received signal is
unusual. Specifically，during the trailing phase of the signal, the phase remains
constant, which is unexpected. When there is no signal, the phase appears to be chaotic.
*Amplitude and Signal Length*: As shown in the figure, when the signal length is
relatively short, both the maximum and the average amplitude increase as the signal
length grows.
I suspect that each sample might be significantly broadened in the time domain, but
since I am not entirely familiar with the USRP B210's hardware processing, I am unsure
if this is the root cause. I am wondering if these issues could potentially be improved
by modifying the hardware configuration, such as adjusting the filter settings or other
parameters. The code I’m using for the B210 receiver is attached.
Has anyone experienced similar issues or have suggestions on adjusting the B210's
configuration or setup to address these distortions? Any insights would be greatly
appreciated.
Thanks in advance for your help!
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