I don't understand what this means. How do you interpret it? Jared.
On Fri, Aug 18, 2023 at 8:25 PM Jiya Johnson <jiyajohnso...@gmail.com> wrote: > > On Sat, Aug 19, 2023, 7:54 AM Jiya Johnson <jiyajohnso...@gmail.com> > wrote: > >> I have tried to do with a simple input 11011101 without noise and with >> noise noise also >> >> On Sat, Aug 19, 2023, 7:52 AM U L <jaredd...@gmail.com> wrote: >> >>> Some ideas: >>> >>> 1. Remove the noise completely. Also use a fixed, repeating input vector >>> rather than random bytes. Look at the actual error patterns between the >>> input and output bits. Sometimes error patterns can clue you in. >>> 2. Check symbol polarity (i.e. 0=>-1, 1=>1, or 0=>1, 1=>-1) >>> 3. Try the more general (non-CCSDS) extended encoder with the same >>> params as the decoder. >>> 4. Esp if 3 works, compare the output of CCSDS with general extended >>> encoder. >>> >>> Good luck. >>> Jared. >>> >>> On Fri, Aug 18, 2023 at 8:04 PM Jiya Johnson <jiyajohnso...@gmail.com> >>> wrote: >>> >>>> 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* >>>>>>> >>>>>>>
