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On 05/21/2018 10:54 PM, Yeo Jin Kuang
Alvin (IA) wrote:
Hi all,
Apparently, I tried connecting the USRP
Source to a Low Pass Filter and to a File Sink, I get
overflows “OOOOOO”. However, when I removed the LPF, there is
no overflow. The question is, why is this happening? Is the
Low Pass Filter in GRC done in the FPGA or in the computer
itself? I am using USRP B210 and my sampling rate is 6MHz.
Is there a solution to this?
Thank you in advanced!
'O' are caused by the computer not "keeping up". Gnu Radio is a
software-defined-radio framework, and all the blocks execute on the
PC host.
It is typically the case that new users make low-pass filters with
very "aggressive" transition bandwidths, which leads to a very
expensive-to-compute
filter. Try relaxing the transition bandwidth.