trellis_siso_f.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004 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_TRELLIS_SISO_F_H
00024 #define INCLUDED_TRELLIS_SISO_F_H
00025 
00026 #include "fsm.h"
00027 #include "trellis_siso_type.h"
00028 #include <gr_block.h>
00029 
00030 class trellis_siso_f;
00031 typedef boost::shared_ptr<trellis_siso_f> trellis_siso_f_sptr;
00032 
00033 trellis_siso_f_sptr trellis_make_siso_f (
00034     const fsm &FSM,     // underlying FSM
00035     int K,              // block size in trellis steps
00036     int S0,             // initial state (put -1 if not specified)
00037     int SK,             // final state (put -1 if not specified)
00038     bool POSTI,         // true if you want a-posteriori info about the input symbols to be mux-ed in the output
00039     bool POSTO,         // true if you want a-posteriori info about the output symbols to be mux-ed in the output
00040     trellis_siso_type_t d_SISO_TYPE // perform "min-sum" or "sum-product" combining 
00041 );
00042 
00043 
00044 
00045 class trellis_siso_f : public gr_block
00046 {
00047   fsm d_FSM;
00048   int d_K;
00049   int d_S0;
00050   int d_SK;
00051   bool d_POSTI;
00052   bool d_POSTO;
00053   trellis_siso_type_t d_SISO_TYPE;
00054   //std::vector<float> d_alpha;
00055   //std::vector<float> d_beta;
00056 
00057   friend trellis_siso_f_sptr trellis_make_siso_f (
00058     const fsm &FSM,
00059     int K,
00060     int S0,
00061     int SK,
00062     bool POSTI,
00063     bool POSTO,
00064     trellis_siso_type_t d_SISO_TYPE);
00065 
00066 
00067   trellis_siso_f (
00068     const fsm &FSM,
00069     int K,
00070     int S0,
00071     int SK,
00072     bool POSTI,
00073     bool POSTO,
00074     trellis_siso_type_t d_SISO_TYPE);
00075 
00076 
00077 public:
00078   fsm FSM () const { return d_FSM; }
00079   int K () const { return d_K; }
00080   int S0 () const { return d_S0; }
00081   int SK () const { return d_SK; }
00082   bool POSTI () const { return d_POSTI; }
00083   bool POSTO () const { return d_POSTO; }
00084   trellis_siso_type_t SISO_TYPE () const { return d_SISO_TYPE; }
00085   void forecast (int noutput_items,
00086                  gr_vector_int &ninput_items_required);
00087   int general_work (int noutput_items,
00088                     gr_vector_int &ninput_items,
00089                     gr_vector_const_void_star &input_items,
00090                     gr_vector_void_star &output_items);
00091 };
00092 
00093 #endif

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