Probably easier to use a vector source rather than text file. Vector source lets you specify the bytes exactly. So you could put in [ 0xdd, ] and be assured that byte will be output.
On Fri, Aug 18, 2023 at 8:32 PM Jiya Johnson <jiyajohnso...@gmail.com> wrote: > What I tried is 11011101( by inputting a text file )it's hex version came > in the output with (3131303131313031) like that with encoding by left > shifting I got the value theoretically and decode I got dd (11011101) bt > this worked over windows not in ubuntu,this output I have done using messag > debug option I am not aware whether it is the correct way. > > On Sat, Aug 19, 2023, 7:58 AM U L <jaredd...@gmail.com> wrote: > >> 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* >>>>>>>>> >>>>>>>>>
