I will try and let you know On Sat, Aug 19, 2023, 8:08 AM U L <jaredd...@gmail.com> wrote:
> 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* >>>>>>>>>> >>>>>>>>>>
