Merge commit 'v3.3.0' into upstream

[debian/gnuradio] / gnuradio-core / src / lib / general / gr_ofdm_bpsk_demapper.cc

diff --git a/gnuradio-core/src/lib/general/gr_ofdm_bpsk_demapper.cc b/gnuradio-core/src/lib/general/gr_ofdm_bpsk_demapper.cc
new file mode 100644 (file)
index 0000000..a01cf35
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_ofdm_bpsk_demapper.cc
@@ -0,0 +1,97 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006 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 <gr_ofdm_bpsk_demapper.h>
+#include <gr_io_signature.h>
+
+gr_ofdm_bpsk_demapper_sptr
+gr_make_ofdm_bpsk_demapper (unsigned int occupied_carriers)
+{
+  return gr_ofdm_bpsk_demapper_sptr (new gr_ofdm_bpsk_demapper (occupied_carriers));
+}
+
+gr_ofdm_bpsk_demapper::gr_ofdm_bpsk_demapper (unsigned occupied_carriers)
+  : gr_block ("ofdm_bpsk_demapper",
+             gr_make_io_signature (1, 1, sizeof(gr_complex)*occupied_carriers),
+             gr_make_io_signature (1, 1, sizeof(unsigned char))),
+    d_occupied_carriers(occupied_carriers),
+    d_byte_offset(0), d_partial_byte(0)
+{
+}
+
+gr_ofdm_bpsk_demapper::~gr_ofdm_bpsk_demapper(void)
+{
+}
+
+unsigned char gr_ofdm_bpsk_demapper::slicer(gr_complex x)
+{
+  return (unsigned char)(x.real() > 0 ? 1 : 0);
+}
+
+void
+gr_ofdm_bpsk_demapper::forecast (int noutput_items, gr_vector_int &ninput_items_required)
+{
+  unsigned ninputs = ninput_items_required.size ();
+  for (unsigned i = 0; i < ninputs; i++)
+    ninput_items_required[i] = 1;
+}
+
+int
+gr_ofdm_bpsk_demapper::general_work(int noutput_items,
+                                   gr_vector_int &ninput_items,
+                                   gr_vector_const_void_star &input_items,
+                                   gr_vector_void_star &output_items)
+{
+  const gr_complex *in = (const gr_complex *)input_items[0];
+  unsigned char *out = (unsigned char *) output_items[0];
+  
+  unsigned int i=0, bytes_produced=0;
+
+  while(i < d_occupied_carriers) {
+
+    while((d_byte_offset < 8) && (i < d_occupied_carriers)) {
+      //fprintf(stderr, "%f+j%f\n", in[i].real(), in[i].imag()); 
+      d_partial_byte |= slicer(in[i++]) << (d_byte_offset++);
+    }
+
+    if(d_byte_offset == 8) {
+      out[bytes_produced++] = d_partial_byte;
+      d_byte_offset = 0;
+      d_partial_byte = 0;
+    }
+  }
+
+#if 0
+printf("demod out: ");
+  for(i = 0; i < bytes_produced; i++) {
+    printf("%4x", out[i]);
+  }
+  printf(" \tlen: %d\n", i);
+#endif
+
+  consume_each(1);
+  return bytes_produced;
+}