hello tom, i tried to put a block of packing bits after FEC decoder block but still received data is not same as transmitted. here i am working in simulation environment not on air so i think there will not be any delay problems.
Hitesh On Mon, Jan 11, 2016 at 10:54 PM, Tom Rondeau <t...@trondeau.com> wrote: > On Fri, Jan 8, 2016 at 12:44 PM, Hitesh Kasera <hiteshkase...@gmail.com> > wrote: > >> thanks tom for your reply. as you told me to use fec api blocks i tried >> to use fec encoder and decoder blocks but still my output is not same as >> input. may be i am missing something while i am using these blocks. i have >> attached the image and .grc file of my flowgraph. >> >> Hitesh >> > > > You probably need to pack your bits after the FEC decoder block. There > might also be some offsets that'll you'll need to deal with, though > probably not in this case. If you add anything with a filter (like a > modulator/demodulator), there will be a group delay you'll need to deal > with and figure out where the start of your actual information bits is. > > Tom > > > > > >> On Mon, Jan 4, 2016 at 8:30 PM, Tom Rondeau <t...@trondeau.com> wrote: >> >>> On Fri, Jan 1, 2016 at 3:17 AM, Hitesh Kasera <hiteshkase...@gmail.com> >>> wrote: >>> >>>> Hi everyone, >>>> >>>> I am trying to use ccsds 27 encoder-decoder to transmit some data. The >>>> decoded data is not same as transmitted. As a source i am transmitting ones >>>> and zeros but after decoding sometimes i am receiving values which are >>>> greater than 1. i am not able to recognize where am i going wrong. if >>>> anyone has any idea please tell me. i have attached both grc file and png >>>> image of my flow graph. >>>> >>>> Best Regards, >>>> Hitesh >>>> >>> >>> >>> Changing the problem a bit, I'd recommend moving away from the CCSDS >>> encoder/decoder blocks and using the FEC API blocks, instead. See: >>> >>> http://gnuradio.org/doc/doxygen/page_fec.html >>> >>> The CC Encoder and CC Decoder are basically the CCSDS codes (you might >>> have to swap the two polynomials; I always forget off the top of my head >>> which is called which code here). >>> >>> Tom >>> >>> >> >
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