Wireless Testbench basebandTr​ansceiver/​capture Error：capture length depends on the device buffer size

Hi @Qian,

Glad to know that you made progress. After reviewing your comments, to capture approximately 5 seconds of continuous data at a sample rate of 100 MHz (which translates to 500 MB/s, you would need a total of around 2.5 GB of memory for the entire duration. Since the X310 has a limited onboard memory buffer of 1 GB, you cannot directly achieve this with a single capture command. The alternative method that I can suggest might work which will be utilizing background capture to segment your data into manageable chunks. You can repeatedly call the capture function in a loop, capturing smaller segments (e.g., 1 second each) and saving them incrementally to disk. For example:

     mkdir('basebandData');
     for i = 1:5 % For 5 seconds
         [dataPath,~] = capture(bbrx,seconds(1),SaveLocation=
         ['basebandData/capture' num2str(i) '.mat'],          Background=true);
         pause(1); % Pause to ensure capture completion
     end

Now, I know that some baseband transceivers support streaming modes where data is continuously streamed to host memory without waiting for full captures. Check if your setup allows this mode. You can configure your transceiver to stream data directly to your computer’s memory, handling it in real-time. If local memory is still a concern, consider using external storage solutions such as SSDs or network-attached storage (NAS). This allows you to bypass local RAM limitations by writing captured data directly to an external drive.

Also, if it is possible for you consider second alternative by upgrading your hardware configuration (e.g., using USRP devices with larger buffers like the USRP X410) that can handle larger data captures in one go.

If these alternatives worked out for you, make sure to check the droppedSamples output after each capture command to ensure that no samples are lost during segmentation or streaming. Once data is captured in segments, consider writing scripts for post-processing that can stitch these segments together if needed.

Hope this helps.

Please let me know if you have any further questions.