Re: "L" error for using file_sink blocks.

On Thu, Dec 12, 2024 at 6:53 PM Yan, Bixing (UT-EEMCS) <b.yan@utwente.nl> wrote:

Hi,

I am using USRP X440 to build a wireless communication prototype. The host PC is equipped with i9-14900K and I am trying to use two transmit channels and two receive channels of the USRP simultaneously. I feed two generated signal to two channels by the USRP_sink block, and then I download the received data  from the USRP_source  by file_sink blocks. The sample rate I use is 150 MHz for each channel. 

However, I noticed that there are many "L" occurs when I run it. Even if I reduce the sample rate to 30 MHz, I can still see the problem. But if I use qt_gui_frequency_sink to visualize the received signal, it can hold up to 150 MHz without any errors.

I would like to ask the reason for this. What cause the "L" errors? Is it about my ssd's writing speed is not high enough?

The "L"s are coming from the transmit side of things. if you feed a single Tx channel, does the issue persist?

--M