Import block: https://wiki.gnuradio.org/index.php?title=Import
On Sat, Aug 19, 2023 at 10:43 AM Jiya Johnson <jiyajohnso...@gmail.com> wrote: > Thanks for the advice! > Try to do but continuously it is showing error Param - Value(value): > Value "numpy.sqrt((10.0**(-esno/10.0))/2.0)" cannot be evaluated: > name 'numpy' is not defined > how can i rectify this? > is there any already done grc files for evaluating ccsds > > On Sat, Aug 19, 2023 at 9:55 PM U L <jaredd...@gmail.com> wrote: > >> I'd try this: >> 1. Change the random source to a vector source with vector [ 0xFF, 0xFF, >> 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ] (that's 4 x >> 0xFF, 8 x 0x00) >> 2. Encoder output can go to the map input, then map to a charToFloat. >> CharToFloat to decoder. >> 3. Remove the entire noise branch. It doesn't make sense to add noise >> before the map anyways. Noise would normally be added as a float after >> charToFloat. >> 4. Vector source to a delay block, delay to one input of BER block. >> Decoder output to pack8 to BER block. >> 5. You'll have to experiment with the delay value. It's probably between >> 2 and 8 bytes. >> 6. If you want to try to observe the delay between the source and the >> decoder, make a 2 input time sink and connect the unpack8 output after the >> vector source to one time sink input, and the decoder output to the other >> sink input. You should be able to see the sample delay between each block >> of inputs and compute the right delay from the difference. >> >> Good luck, >> Jared. >> >> On Sat, Aug 19, 2023 at 5:13 AM Jiya Johnson <jiyajohnso...@gmail.com> >> wrote: >> >>> Any suggestions >>> >>> On Sat, Aug 19, 2023, 9:15 AM Jiya Johnson <jiyajohnso...@gmail.com> >>> wrote: >>> >>>> But still in CCSDS case i am getting -0.3 only BER and not even >>>> saturating in FEC extended CC case(as per CCSDS Standard book it is >>>> dropping to 0 by 5dB) >>>> >>>> On Sat, Aug 19, 2023 at 8:54 AM U L <jaredd...@gmail.com> wrote: >>>> >>>>> Hmm, this has gotten more complicated since your original post. Why? >>>>> >>>>> A good place to start might be the example GRC as referenced on this >>>>> page https://wiki.gnuradio.org/index.php?title=FEC_Extended_Decoder. >>>>> You can change the FEC definitions from LDPC to CC and add a BER block >>>>> with >>>>> a delay b/w the input bytes and output bytes (bypass the char to float >>>>> after the decoder). Once that's working, you can replace the FEC encoder >>>>> with a CCSDS one. >>>>> >>>>> Jared. >>>>> >>>>> On Fri, Aug 18, 2023 at 9:05 PM Jiya Johnson <jiyajohnso...@gmail.com> >>>>> wrote: >>>>> >>>>>> I am getting need help pls look on the screenshot >>>>>> >>>>>> On Sat, Aug 19, 2023 at 8:23 AM Jiya Johnson <jiyajohnso...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> 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* >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>
