Hi, Based on the given modifications still I am getting a -0.300 range of BER constantly from 0 to 15 dB range of SNR values.No variations are happening.
How can I check the functionality of the block(encoder and decoder to check whether it's encoding and decoding properly)with a sample input. On Sun, Aug 13, 2023, 8:11 PM U L <jaredd...@gmail.com> wrote: > One other thing I noticed is that the encode CCSDS, decode, CCSDS, and BER > blocks all operate on packed bytes. (See e.g. > https://wiki.gnuradio.org/index.php?title=Encode_CCSDS_27). To do this > you would change your random source to output from 0 to 256 byte values. > Also, considering the output of the decoder block are packed bytes you > should probably skip the byte->float and binary slicer after your decoder > and just input it's output directly into the BER block. Finally, looking at > the https://wiki.gnuradio.org/index.php?title=Decode_CCSDS_27 page it > seems the delay out of the decoder is 4 bytes, so you could add a delay of > 4 between your source and BER block to align the two streams. > > Jared. > > On Sat, Aug 12, 2023 at 9:58 PM U L <jaredd...@gmail.com> wrote: > >> One thing I think might be an issue is that you have no delay between >> your source reference and your BER block. Usually the FEC decoders (and >> possibly the encoder?) may output blocks of 0s before they output the >> samples that correspond to your inputs. I don't know much about those FEC >> blocks specifically, but maybe the docs have some info on their delays. You >> can just insert a delay block b/w your random source and the ber block to >> align the input and output bits. >> >> Hope that helps, >> Jared. >> >> On Sat, Aug 12, 2023 at 4:28 AM Jiya Johnson <jiyajohnso...@gmail.com> >> wrote: >> >>> >>> [image: image.png] >>> Dear community >>> Need help for BER plot using the above flowgraph its always coming >>> 10^-1.17 and whenever I tried to change the noise voltage the values are >>> not changing. >>> Please find the attached GRC file for your reference. >>> >>> *Regards, JIYA JOHNSON* >>> >>>
