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authorMartin Braun <martin.braun@kit.edu>2013-03-15 02:12:20 -0700
committerJohnathan Corgan <johnathan@corganlabs.com>2013-03-15 02:13:55 -0700
commitf968b36d4ed2b194111585605f9a1b5367638fb3 (patch)
treec5a18a3412aa3a4b2c89ede3a68d08ba7980401f /gr-digital/lib/digital_ofdm_equalizer_base.cc
parent86d05c838e2cfeb9a9c73a0e19668a45cc8b333c (diff)
Squash/rebased martin/ofdm-master onto trial merge branch
Conflicts: gr-blocks/include/blocks/CMakeLists.txt
Diffstat (limited to 'gr-digital/lib/digital_ofdm_equalizer_base.cc')
-rw-r--r--gr-digital/lib/digital_ofdm_equalizer_base.cc116
1 files changed, 116 insertions, 0 deletions
diff --git a/gr-digital/lib/digital_ofdm_equalizer_base.cc b/gr-digital/lib/digital_ofdm_equalizer_base.cc
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+/* -*- c++ -*- */
+/* Copyright 2012 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_equalizer_base.h"
+
+// *** Base class ****************************************************
+digital_ofdm_equalizer_base::digital_ofdm_equalizer_base(int fft_len) :
+ d_fft_len(fft_len),
+ d_carr_offset(0)
+{
+}
+
+
+digital_ofdm_equalizer_base::~digital_ofdm_equalizer_base()
+{
+}
+
+
+// *** Sub-Base class for 1D equalizers using pilot tones *************
+digital_ofdm_equalizer_1d_pilots::digital_ofdm_equalizer_1d_pilots(
+ int fft_len,
+ const std::vector<std::vector<int> > &occupied_carriers,
+ const std::vector<std::vector<int> > &pilot_carriers,
+ const std::vector<std::vector<gr_complex> > &pilot_symbols,
+ int symbols_skipped,
+ bool input_is_shifted)
+ : digital_ofdm_equalizer_base(fft_len),
+ d_occupied_carriers(fft_len, false),
+ d_pilot_carriers(pilot_carriers.size(), std::vector<bool>(fft_len, false)),
+ d_pilot_symbols(pilot_symbols.size(), std::vector<gr_complex>(fft_len, gr_complex(0, 0))),
+ d_symbols_skipped(symbols_skipped),
+ d_pilot_carr_set(symbols_skipped),
+ d_channel_state(fft_len, gr_complex(1, 0))
+{
+ int fft_shift_width = 0;
+ if (input_is_shifted) {
+ fft_shift_width = fft_len/2;
+ }
+ if (!occupied_carriers.size()) {
+ std::fill(d_occupied_carriers.begin(), d_occupied_carriers.end(), true);
+ } else {
+ for (unsigned i = 0; i < occupied_carriers.size(); i++) {
+ for (unsigned k = 0; k < occupied_carriers[i].size(); k++) {
+ int carr_index = occupied_carriers[i][k];
+ if (occupied_carriers[i][k] < 0) {
+ carr_index += fft_len;
+ }
+ if (carr_index >= fft_len || carr_index < 0) {
+ throw std::invalid_argument("data carrier index out of bounds.");
+ }
+ d_occupied_carriers[(carr_index + fft_shift_width) % fft_len] = true;
+ }
+ }
+ }
+ if (pilot_carriers.size()) {
+ for (unsigned i = 0; i < pilot_carriers.size(); i++) {
+ if (pilot_carriers[i].size() != pilot_symbols[i].size()) {
+ throw std::invalid_argument("pilot carriers and -symbols do not match.");
+ }
+ for (unsigned k = 0; k < pilot_carriers[i].size(); k++) {
+ int carr_index = pilot_carriers[i][k];
+ if (pilot_carriers[i][k] < 0) {
+ carr_index += fft_len;
+ }
+ if (carr_index >= fft_len || carr_index < 0) {
+ throw std::invalid_argument("pilot carrier index out of bounds.");
+ }
+ d_pilot_carriers[i][(carr_index + fft_shift_width) % fft_len] = true;
+ d_pilot_symbols[i][(carr_index + fft_shift_width) % fft_len] = pilot_symbols[i][k];
+ }
+ }
+ }
+}
+
+
+digital_ofdm_equalizer_1d_pilots::~digital_ofdm_equalizer_1d_pilots()
+{
+}
+
+
+void
+digital_ofdm_equalizer_1d_pilots::reset()
+{
+ std::fill(d_channel_state.begin(), d_channel_state.end(), gr_complex(1, 0));
+ d_pilot_carr_set = d_symbols_skipped;
+}
+
+
+void digital_ofdm_equalizer_1d_pilots::get_channel_state(std::vector<gr_complex> &taps)
+{
+ taps = d_channel_state;
+}
+
+