Simulink Ettus USRP SDRu Transmistter/Receiver Blocks

Is there any way that I can use the SDRu transmitter and receiver blocks to reference a specified RF port? Currently I am unable to transmit and receive a signal without running two different simulink models at the same time.

[Aiden Mitio]

I haven't been able to transmit or recieve RF signal, can you provide some insight on how you did it?

Answer 1

[Ethem]

Hi Ruolin,

It is possible to use transmit and receive blocks in the same model, enabling you to transmit and receive at the same time. Can you explain a little more your set up so that we can give you a more detailed answer?

On the other hand, it is not possible to specify RF ports using the USRP Support Package. If the daughterboard has a Tx/Rx and Rx port, then the support package uses Tx/Rx to transmit and Rx to receive.

[Seppeli]

Hi,

if I get Ethem right, I cannot receive via the Tx/Rx ports of my Ettus B210. In GNU I can decide whether I want to receive via Rx or Tx/Rx. Is there the possibility that also the USRP SupportPackage for MATLAB supports this operation in further days?

Best!

Answer 2

[John Rodgers]

Hi Ethem, I'm trying to Transmit and Receive at the same time with one USRP. This is my stream processing loop :

   if radioFound
       timeCounter=0;
       while timeCounter<10
           % Transmitter Stream processing
           data_tx = step(hwav);% Generate waveform
           step(radioTx,data_tx);
           % Receiver Stream processing
           [data_rx, len_rx] = step(radioRx);
           timeCounter=timeCounter+FrameLength/FrontEndSampleRate;
         end
    end

It seems that it is sequential : when it sends data, it doesn't receive and vice versa. The prolem is that i just receive a part of the waveform i send. Can you please give me some advice ? Thanks in advance. John

[Ethem]

This code looks like it is serial but in fact it is not. Any system that communicates with hardware uses buffers to store the received or transmitted data. The hardware driver reads and writes to these buffers in parallel (at the same time). The sequential MATLAB code sends and receives data to these buffers. The fact that you receive the data you sent also confirms this.

Why you receive the data you sent is a result of hardware + physics. First of all, there is always some amount of electrical leakage between the transmitter circuit of the radio and the receiver circuit. Also, the receiver antenna will receive signals from your transmitter antenna. You need to algorithmically handle this self-interference.