Is it possible to perform real-time low-pass filtering on the data received from the USRP X310 in Matlab

I do low-pass filtering on the received data from the X310, and find this step will slow down the processing speed.

Can implement filtering in the parallel way?

Can I do other demodulation steps parallelly in Matlab?

Thanks,

Alfred

[dpb]

Dunno, but you might want to look into the information presented in <High-Speed Data Transmit/Capture Using MATLAB and USRP> as well as the <Wireles Testbench>

Answer 1

[Walter Roberson]

Any data you receive from the USRP will be packetized and will suffer from variable time delay. It is not possible to perform real-time operations on this kind of data. The best you could hope for is "near real-time".

[Alfred]

Walter,

Thanks. I understand that those processing steps are near rea-time. I want to know is there any method to use more cpu threads to process the received data, just like gnuradio.

Best wishes,

Alfred

[dpb]

See

https://www.mathworks.com/help/parallel-computing/run-matlab-functions-on-a-gpu.html

https://www.mathworks.com/help/matlab/matlab_prog/run-functions-on-threads.html

You'll have to determine if the setup/teardown time to/from the parallel is less than the compute time or not to see if there's a net overall improvement in throughput. Longer time records will be better here...

[Walter Roberson]

Note that the buffering of packets is handled asynchronously behind the scenes, with comm.SDRuReceiver receive requests pulling packets out of the buffer if they are available (and otherwise waiting for packets to be ready.) So there is typically no need to put comm.SDRuReciever calls into the background.

[Alfred]

I see, Thanks.

Best regards,

Alfred

Answer 2

[George]

You could consider implementing the low pass filter on the FPGA of the USRP. Take a look at this documentation page to get started:

https://www.mathworks.com/help/wireless-testbench/ug/target-ni-ursp-devices-workflow.html