code changes

2013-10-10 11:06:36 +02:00
parent b0503d5fa3
commit 58ed53a5d5
42 changed files with 2848 additions and 362 deletions
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2013 Bastian Bloessl <bloessl@ccs-labs.org>
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <ieee802-11/ofdm_pilot.h>
+
+#include "utils.h"
+#include <gnuradio/io_signature.h>
+
+using namespace gr::ieee802_11;
+
+
+class ofdm_pilot_impl : public ofdm_pilot {
+
+static const int TONES = 48;
+static const int FFT_SIZE = 64;
+
+public:
+
+ofdm_pilot_impl(bool debug) :
+		sync_block ("ofdm_pilot",
+				gr::io_signature::make(1, 1, TONES * sizeof(gr_complex)),
+				gr::io_signature::make(1, 1, FFT_SIZE * sizeof(gr_complex))),
+		d_offset(0),
+		d_debug(debug) {
+
+}
+
+~ofdm_pilot_impl() {
+
+}
+
+int work (int noutput_items, gr_vector_const_void_star& input_items,
+		gr_vector_void_star& output_items) {
+
+	const gr_complex *in = (const gr_complex*)input_items[0];
+	gr_complex *out = (gr_complex*)output_items[0];
+
+	int i = 0;
+	int count = 0;
+	const uint64_t nread = nitems_read(0);
+	std::vector<gr::tag_t> tags;
+
+	while (count < noutput_items) {
+
+		get_tags_in_range(tags, 0, nread + count, nread + count + 1, pmt::string_to_symbol("ofdm_start"));
+
+		if(tags.size()) {
+			d_offset = 0;
+			dout << "OFDM PILOT: start of OFDM frame" << std::endl;
+		}
+
+		// guard band
+		memset(out, 0, 6 * sizeof(gr_complex));
+
+		// subcarriers -26 to -22
+		memcpy(out + 6, in, 5 * sizeof(gr_complex));
+
+		// pilot 1
+		out[11] = POLARITY[d_offset];
+
+		// subcarriers -20 to -8
+		memcpy(out + 12, in + 5, 13 * sizeof(gr_complex));
+
+		// pilot 2
+		out[25] = POLARITY[d_offset];
+
+		// subcarriers -6 to -1
+		memcpy(out + 26, in + 18, 6 * sizeof(gr_complex));
+
+		// DC
+		out[32] = 0;
+
+		// subcarriers 1 to 6
+		memcpy(out + 33, in + 24, 6 * sizeof(gr_complex));
+
+		// pilot 3
+		out[39] = POLARITY[d_offset];
+
+		// pubcarriers 8 to 20
+		memcpy(out + 40, in + 30, 13 * sizeof(gr_complex));
+
+		// pilot 4
+		out[53] = -POLARITY[d_offset];
+
+		// subcarriers 22 to 26
+		memcpy(out + 54, in + 43, 5 * sizeof(gr_complex));
+
+		// guard band
+		memset(out + 59, 0, 5 * sizeof(gr_complex));
+
+
+		count++;
+		out += FFT_SIZE;
+		in += TONES;
+		d_offset = (d_offset + 1) % 127;
+	}
+
+	dout << "OFDM PILOT: produced items: " << noutput_items << std::endl;
+
+	return noutput_items;
+}
+
+private:
+	bool d_debug;
+	int d_offset;
+	static const gr_complex POLARITY[127];
+};
+
+const gr_complex ofdm_pilot_impl::POLARITY[127] = {
+		 1, 1, 1, 1,-1,-1,-1, 1,-1,-1,-1,-1, 1, 1,-1, 1,
+		-1,-1, 1, 1,-1, 1, 1,-1, 1, 1, 1, 1, 1, 1,-1, 1,
+		 1, 1,-1, 1, 1,-1,-1, 1, 1, 1,-1, 1,-1,-1,-1, 1,
+		-1, 1,-1,-1, 1,-1,-1, 1, 1, 1, 1, 1,-1,-1, 1, 1,
+		-1,-1, 1,-1, 1,-1, 1, 1,-1,-1,-1, 1, 1,-1,-1,-1,
+		-1, 1,-1,-1, 1,-1, 1, 1, 1, 1,-1, 1,-1, 1,-1, 1,
+		-1,-1,-1,-1,-1, 1,-1, 1, 1,-1, 1,-1, 1, 1, 1,-1,
+		-1, 1,-1,-1,-1, 1, 1, 1,-1,-1,-1,-1,-1,-1,-1 };
+
+ofdm_pilot::sptr
+ofdm_pilot::make(bool debug) {
+	return gnuradio::get_initial_sptr(new ofdm_pilot_impl(debug));
+}
+