Re: [Discuss-gnuradio] strange deterministic frame error in gr-ieee802-11

[Bastian Bloessl]

Hi,


On 01/17/2017 11:13 AM, Nikita Airee wrote:
>     - Make sure that the xy plot shows clear constellations.
>
>         tx_gain is set to 30dB and rx_gain to 0.
>
>
>     If constellations don't look nice, you could try lowering the tx and
>     increasing the rx gain. (also make sure that the antennas are
>     connected to the correct ports).
>
>
> The constellation is kind of clear(PFA the screenshot). Decreasing tx
> gain and increasing rx gain doesn't help either.
>
> I even tried repeating the experiment with a different set of x310s but
> there was absolutely no change. Would you still say that it could be an
> error in my hardware?
>
> Also, another observation, the error in these frames seems to be around
> the same area of that particular frame everytime. Could this mean something?

Unfortunately, I don't have the hardware to try.

Since you always loose the same frames it sounds like a bug in the 
receiver, but then they should also be dropped in  simulations.

The last idea would be that this particular frames are mapped to a 
suboptimal wave form (high PAPR?) The constellations already look like 
the gain is too high. Maybe frames with high peak amplitudes get dropped.

Best,
Bastian