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diff --git a/gr-trellis/src/lib/trellis_siso_f.h b/gr-trellis/src/lib/trellis_siso_f.h
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+++ b/gr-trellis/src/lib/trellis_siso_f.h
@@ -0,0 +1,92 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef INCLUDED_TRELLIS_SISO_F_H
+#define INCLUDED_TRELLIS_SISO_F_H
+
+#include "fsm.h"
+#include "trellis_siso_type.h"
+#include <gr_block.h>
+
+class trellis_siso_f;
+typedef boost::shared_ptr<trellis_siso_f> trellis_siso_f_sptr;
+
+trellis_siso_f_sptr trellis_make_siso_f (
+    const fsm &FSM, 
+    int K,
+    int S0,
+    int SK,
+    bool POSTI,
+    bool POSTO,
+    trellis_siso_type_t d_SISO_TYPE);
+
+
+
+class trellis_siso_f : public gr_block
+{
+  fsm d_FSM;
+  int d_K;
+  int d_S0;
+  int d_SK;
+  bool d_POSTI;
+  bool d_POSTO;
+  trellis_siso_type_t d_SISO_TYPE;
+  std::vector<float> d_alpha;
+  std::vector<float> d_beta;
+
+  friend trellis_siso_f_sptr trellis_make_siso_f (
+    const fsm &FSM,
+    int K,
+    int S0,
+    int SK,
+    bool POSTI,
+    bool POSTO,
+    trellis_siso_type_t d_SISO_TYPE);
+
+
+  trellis_siso_f (
+    const fsm &FSM,
+    int K,
+    int S0,
+    int SK,
+    bool POSTI,
+    bool POSTO,
+    trellis_siso_type_t d_SISO_TYPE);
+
+
+public:
+  fsm FSM () const { return d_FSM; }
+  int K () const { return d_K; }
+  int S0 () const { return d_S0; }
+  int SK () const { return d_SK; }
+  bool POSTI () const { return d_POSTI; }
+  bool POSTO () const { return d_POSTO; }
+  trellis_siso_type_t SISO_TYPE () const { return d_SISO_TYPE; }
+  void forecast (int noutput_items,
+                 gr_vector_int &ninput_items_required);
+  int general_work (int noutput_items,
+                    gr_vector_int &ninput_items,
+                    gr_vector_const_void_star &input_items,
+                    gr_vector_void_star &output_items);
+};
+
+#endif