whitout antenna array,the Rx have iq sample count 45,how to get the true iq sample from Tx?

RE: whitout antenna array,the Rx have iq sample count 45,how to get the true iq sample from Tx?

swz_nordic — Wed, 20 Apr 2022 08:48:56 GMT

ok,i know your meaning.can you have a look at my err -22 problem?i want to get to make use of the antenna array.because i have 16 antenna array by silab.thanks

RE: whitout antenna array,the Rx have iq sample count 45,how to get the true iq sample from Tx?

Ales — Wed, 20 Apr 2022 08:44:59 GMT

so that you are receiving 45 IQ samples is correct.

RE: whitout antenna array,the Rx have iq sample count 45,how to get the true iq sample from Tx?

Ales — Wed, 20 Apr 2022 08:40:21 GMT

No you need all overlay files and ant_patterns so the code is working. I am just saying that if you have connected antenna array or not you will get 45 IQ samples.

RE: whitout antenna array,the Rx have iq sample count 45,how to get the true iq sample from Tx?

swz_nordic — Tue, 19 Apr 2022 13:22:51 GMT

ok,i know your meaning.if there ia only a PCB antenna.we don't use any GPIO.so we don't need board.overlay file such as nrf52833dk_nrf52833.overlay.besides,we have no antenna array,so we should remove the ant_partterns in main.c file.

is this your meaning?i don't have a try.if you have a try,we may have a talk.

Thanks for your reply.i have know a lot from you.

RE: whitout antenna array,the Rx have iq sample count 45,how to get the true iq sample from Tx?

Ales — Tue, 19 Apr 2022 07:00:24 GMT

If you don't have an antenna array connected then BLE data packets are probably received with PCB antenna on DK. You can have configured GPIO pins to switch between antennas (and GPIOs are toggling) but since only PCB antenna is always connected to radio peripheral then you will received IQ samples only from that antenna. You received the same number of IQ samples since everything from DK point of view and your code is working as expected. So if you have antenna array connected or not you will receive 45 samples.

Of course you cannot get AoA from only one antenna so you need antenna array with RF switches.