1 files changed, 70 insertions, 0 deletions
diff --git a/gr-digital/lib/digital_ofdm_cyclic_prefixer.cc b/gr-digital/lib/digital_ofdm_cyclic_prefixer.cc
new file mode 100644
index 000000000..192af2591
--- /dev/null
+++ b/gr-digital/lib/digital_ofdm_cyclic_prefixer.cc
@@ -0,0 +1,70 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2006,2010,2011 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <digital_ofdm_cyclic_prefixer.h>
+#include <gr_io_signature.h>
+
+digital_ofdm_cyclic_prefixer_sptr
+digital_make_ofdm_cyclic_prefixer (size_t input_size, size_t output_size)
+{
+  return gnuradio::get_initial_sptr(new digital_ofdm_cyclic_prefixer (input_size,
+								      output_size));
+}
+
+digital_ofdm_cyclic_prefixer::digital_ofdm_cyclic_prefixer (size_t input_size,
+							    size_t output_size)
+  : gr_sync_interpolator ("ofdm_cyclic_prefixer",
+			  gr_make_io_signature (1, 1, input_size*sizeof(gr_complex)),
+			  gr_make_io_signature (1, 1, sizeof(gr_complex)),
+			  output_size), 
+    d_input_size(input_size),
+    d_output_size(output_size)
+
+{
+}
+
+int
+digital_ofdm_cyclic_prefixer::work (int noutput_items,
+				    gr_vector_const_void_star &input_items,
+				    gr_vector_void_star &output_items)
+{
+  gr_complex *in = (gr_complex *) input_items[0];
+  gr_complex *out = (gr_complex *) output_items[0];
+  size_t cp_size = d_output_size - d_input_size;
+  unsigned int i=0, j=0;
+
+  j = cp_size;
+  for(i=0; i < d_input_size; i++,j++) {
+    out[j] = in[i];
+  }
+
+  j = d_input_size - cp_size;
+  for(i=0; i < cp_size; i++, j++) {
+    out[i] = in[j];
+  }
+
+  return d_output_size;
+}