RE: False IQ signal

Elfving — Mon, 27 Jun 2022 15:09:19 GMT

Hello Theo, sorry about the delay

Are there any updates from your side?

First of all, note that it is hard to judge the I/Q data by itself. It is recommended to look at the vectors or the resulting angles instead.

So your antenna array has 4 antennas? What pattern, sample spacing and sample duration are you using? Keep in mind that the antenna pattern used in the sampling period depends on the sampling in the reference period, getting you a different switch pattern (for more info see our whitepaper on DF). Are you sure that you are looking the right antennas in your graph?

Another thing is that the samples aren't taken at the same instant. Radio peripheral takes samples one after another for antennas configured by antenna switching pattern. To evaluate angles according to method described in whitepaper nWP036 you have to apply correction to received IQ samples. You have to correct phase by angle related with the delay between first and particular sample.

Regards,

Elfving

RE: False IQ signal

theo17 — Wed, 08 Jun 2022 08:05:20 GMT

After some research i have read that maybe i have to add RADIO->CLEARPATERN=1 but i don't see the definition of CLEARPATERN. Do you have an idea of what can i do to add this ? And where i have to add ?

RE: False IQ signal

theo17 — Wed, 08 Jun 2022 08:03:31 GMT

Thank you So much

RE: False IQ signal

Kenneth — Tue, 07 Jun 2022 14:31:26 GMT

I can check internally if someone have an idea.

Kenneth