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diff --git a/gr-channels/include/gnuradio/channels/fading_model.h b/gr-channels/include/gnuradio/channels/fading_model.h
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+++ b/gr-channels/include/gnuradio/channels/fading_model.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2013 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 3, 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_CHANNELS_FADING_MODEL_H
+#define INCLUDED_CHANNELS_FADING_MODEL_H
+
+#include <gnuradio/channels/api.h>
+#include <gnuradio/sync_block.h>
+#include <gnuradio/types.h>
+
+namespace gr {
+  namespace channels {
+    
+    /*!
+     * \brief fading simulator
+     * \ingroup channel_models_blk
+     *
+     * \details
+     * This block implements a basic fading model simulator that can
+     * be used to help evaluate, design, and test various signals,
+     * waveforms, and algorithms. 
+     */
+    class CHANNELS_API fading_model : virtual public sync_block
+    {
+    public:
+      // gr::channels::channel_model::sptr
+      typedef boost::shared_ptr<fading_model> sptr;
+
+      /*! \brief Build the channel simulator.
+       *
+       * \param N The number of sinusiods to use in simulating the channel 8 is a good value 
+       * \param fDTs    normalized maximum doppler frequency, fD * Ts
+       * \param LOS     include Line-of-Site path? selects between Rayleigh (NLOS) and Rician (LOS) models
+       * \param K       Rician factor (ratio of the specular power to the scattered power)
+       * \param seed    a random number to seed the noise generators
+       */
+      static sptr make(unsigned int N,
+                float fDTs=0.01,
+                bool LOS=true,
+                float K=4,
+                int seed=0);
+
+      virtual float fDTs() = 0;
+      virtual float K() = 0;
+      virtual float step() = 0;
+
+      virtual void set_fDTs(float fDTs) = 0;
+      virtual void set_K(float K) = 0;
+      virtual void set_step(float step) = 0;
+
+    };
+
+  } /* namespace channels */
+} /* namespace gr */
+
+#endif /* INCLUDED_CHANNELS_FADING_MODEL_H */