Re: [Discuss-gnuradio] Feedback with Transmitters and Receiver

[Martin Braun]

It seems like if you have one USRP sink (for MIMO tx) and one USRP
source (for rx) that's all you should need. You can evaluate the rx_time
from the rx to know where you are in time.

Although I admit I'm probably not fully understanding what you want to
do. Maybe you can eloborate?

m

On 04/13/2016 09:23 AM, Pavan Yedavalli wrote:
> Hi,
> 
> I have been trying to do some research using MIMO transmitters and
> feedback from a receiver. Specifically, I have two antennas connected to
> two USRPs, and I am transmitting the same signal from both of those
> (MIMO synchronized) to another USRP and antenna.This receive USRP and
> antenna needs to measure its received power, which I then feed back to
> my computer, do some processing on it, and then produce a new
> transmission from the two antennas on the left, and that keeps going
> until my loop is done. 
> 
> What I'm having trouble with is how to set up my self-created block to
> transmit from the two synchronized ones with my particular weights but
> also receive from the one on the right correctly so that it gives me the
> proper received power. Right now, I'm doing both the transmit and
> receive processes independently, and it's very difficult to get the
> proper capture on the receive side and send it back.
> 
> I'm not sure if that makes sense, but that type of feedback has been
> very difficult. Note that I've been able to create this loop, block, and
> feedback setup with an RSSI circuit and the two transmitters because I
> can feedback its reading through USB nicely/if not with a bit of a hack
> using minicom. I just can't do it when the receiver is a USRP. I must be
> missing something. Thank you for any help.
> 
> -- 
> Pavan
> 
> 
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