GNU Radio 3.7.1 C++ API
decode_ccsds_27_fb.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2012 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_FEC_DECODE_CCSDS_27_FB_H
00024 #define INCLUDED_FEC_DECODE_CCSDS_27_FB_H
00025 
00026 #include <gnuradio/fec/api.h>
00027 #include <gnuradio/sync_decimator.h>
00028 
00029 namespace gr {
00030   namespace fec {
00031 
00032     /*! \brief A rate 1/2, k=7 convolutional decoder for the CCSDS standard
00033      * \ingroup error_coding_blk
00034      *
00035      * \details
00036      * This block performs soft-decision convolutional decoding using the Viterbi
00037      * algorithm.
00038      *
00039      * The input is a stream of (possibly noise corrupted) floating point values
00040      * nominally spanning [-1.0, 1.0], representing the encoded channel symbols
00041      * 0 (-1.0) and 1 (1.0), with erased symbols at 0.0.
00042      *
00043      * The output is MSB first packed bytes of decoded values.
00044      *
00045      * As a rate 1/2 code, there will be one output byte for every 16 input symbols.
00046      *
00047      * This block is designed for continuous data streaming, not packetized data.
00048      * The first 32 bits out will be zeroes, with the output delayed four bytes
00049      * from the corresponding inputs.
00050      */
00051     
00052     class FEC_API decode_ccsds_27_fb : virtual public sync_decimator
00053     {
00054     public:
00055       
00056       // gr::fec::decode_ccsds_27_fb::sptr
00057       typedef boost::shared_ptr<decode_ccsds_27_fb> sptr;
00058 
00059       static sptr make();
00060     };
00061 
00062   } /* namespace fec */
00063 } /* namespace gr */
00064 
00065 #endif /* INCLUDED_FEC_DECODE_CCSDS_27_FB_H */