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diff --git a/gr-digital/include/digital_ofdm_cyclic_prefixer.h b/gr-digital/include/digital_ofdm_cyclic_prefixer.h
new file mode 100644
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+++ b/gr-digital/include/digital_ofdm_cyclic_prefixer.h
@@ -0,0 +1,58 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004-2006,2011 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_DIGITAL_OFDM_CYCLIC_PREFIXER_H
+#define INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H
+
+#include <gr_sync_interpolator.h>
+#include <stdio.h>
+
+class digital_ofdm_cyclic_prefixer;
+typedef boost::shared_ptr<digital_ofdm_cyclic_prefixer> digital_ofdm_cyclic_prefixer_sptr;
+
+digital_ofdm_cyclic_prefixer_sptr 
+digital_make_ofdm_cyclic_prefixer (size_t input_size, size_t output_size);
+
+
+/*!
+ * \brief adds a cyclic prefix vector to an input size long ofdm
+ * symbol(vector) and converts vector to a stream output_size long.
+ * \ingroup ofdm_blk
+ */
+class digital_ofdm_cyclic_prefixer : public gr_sync_interpolator
+{
+  friend digital_ofdm_cyclic_prefixer_sptr
+    digital_make_ofdm_cyclic_prefixer (size_t input_size, size_t output_size);
+
+ protected:
+  digital_ofdm_cyclic_prefixer (size_t input_size, size_t output_size);
+
+ public:
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+ private:
+  size_t d_input_size;
+  size_t d_output_size;
+};
+
+#endif /* INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H */