Re: [Discuss-gnuradio] use of CCSDS 27 encoder-decoder blocks

From:

Hitesh Kasera

Subject:

Date:

Fri, 8 Jan 2016 23:14:25 +0530

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

On Mon, Jan 4, 2016 at 8:30 PM, Tom Rondeau <address@hidden> wrote:

On Fri, Jan 1, 2016 at 3:17 AM, Hitesh Kasera <address@hidden> 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