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diff --git a/gr-channels/lib/flat_fader_impl.h b/gr-channels/lib/flat_fader_impl.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 FLAT_FADER_IMPL_H
+#define FLAT_FADER_IMPL_H
+
+#include <gnuradio/io_signature.h>
+#include <iostream>
+
+#include <boost/format.hpp>
+#include <boost/random.hpp>
+
+#include <gnuradio/fxpt.h>
+#include <sincostable.h>
+
+// FASTSINCOS:  0 = slow native,  1 = gr::fxpt impl,  2 = sincostable.h
+#define FASTSINCOS  2
+
+namespace gr {
+  namespace channels { 
+
+    class flat_fader_impl {
+      private:
+        // initial theta variate generator
+        boost::mt19937 seed_1;
+        boost::uniform_real<> dist_1; // U(-pi,pi)
+        boost::variate_generator<boost::mt19937&, boost::uniform_real<> > rv_1;
+    
+        // random walk variate
+        boost::mt19937 seed_2;
+        boost::uniform_real<> dist_2; // U(-pi,pi)
+        boost::variate_generator<boost::mt19937&, boost::uniform_real<> > rv_2;
+      
+      public:
+        int d_N; // number of sinusoids
+        float d_fDTs;  // normalized maximum doppler frequency
+        double d_theta; // random walk variable (RWP)
+        float d_theta_los;
+        float d_step;  // maximum random walk step size
+        uint64_t d_m;  // sample counter
+        
+        float d_K;     // Rician factor (ratio of the specular power to the scattered power)
+        bool d_LOS;    // LOS path exists? chooses Rician (LOS) vs Rayleigh (NLOS) model.
+        
+        std::vector<float> d_psi; // in-phase initial phase
+        std::vector<float> d_phi; // quadrature initial phase
+        
+        std::vector<float>  d_costable;
+        
+        sincostable d_table;
+        
+        float scale_sin, scale_los, scale_nlos;
+    
+        void update_theta();
+    
+        flat_fader_impl(unsigned int N, float fDTs, bool LOS, float K, int seed);
+        gr_complex next_sample();
+    
+    }; /* class flat_fader_impl */
+  } /* namespace channels */
+} /* namespace gr */
+
+#endif // FLAT_FADER_IMPL_H