On Tue, Jan 12, 2016 at 6:47 AM, Hitesh Kasera <[email protected]> wrote:
> 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 > Delays are also caused by filters. This isn't an issue in your case, but just so you know. As for your current issues, it'll be hard to help you without running your program directly. However, we have a lot of debugging tools, and using the QT GUI blocks to plot the signals and try and observe what's happening is a useful way of debugging on your own. Also, look at $prefix/share/gnuradio/examples/fec. There are a lot of examples for using the FEC blocks here. Tom > On Mon, Jan 11, 2016 at 10:54 PM, Tom Rondeau <[email protected]> wrote: > >> On Fri, Jan 8, 2016 at 12:44 PM, Hitesh Kasera <[email protected]> >> 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 <[email protected]> wrote: >>> >>>> On Fri, Jan 1, 2016 at 3:17 AM, Hitesh Kasera <[email protected]> >>>> 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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