add equalizers

2016-05-31 15:36:05 +02:00
parent 5a9846fa67
commit 052d5022b0
12 changed files with 413 additions and 140 deletions
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2016 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 "ls.h"
+#include <cstring>
+#include <iostream>
+
+using namespace gr::ieee802_11::equalizer;
+
+void ls::equalize(gr_complex *in, int n, gr_complex *symbols, uint8_t *bits, boost::shared_ptr<gr::digital::constellation> mod) {
+
+	if(n == 0) {
+		std::memcpy(d_H, in, 64 * sizeof(gr_complex));
+
+	} else if(n == 1) {
+		double signal = 0;
+		double noise = 0;
+		for(int i = 0; i < 64; i++) {
+			noise += std::pow(std::abs(d_H[i] - in[i]), 2);
+			signal += std::pow(std::abs(d_H[i] + in[i]), 2);
+		}
+
+		d_snr = 10 * std::log10(signal / noise / 2);
+
+		for(int i = 0; i < 64; i++) {
+			d_H[i] += in[i];
+			d_H[i] /= LONG[i] * gr_complex(2, 0);
+		}
+
+	} else {
+
+		int c = 0;
+		for(int i = 0; i < 64; i++) {
+			if( (i == 11) || (i == 25) || (i == 32) || (i == 39) || (i == 53) || (i < 6) || ( i > 58)) {
+				continue;
+			} else {
+				symbols[c] = in[i] / d_H[i];
+				bits[c] = mod->decision_maker(&symbols[c]);
+				c++;
+			}
+		}
+	}
+}
+
+double ls::get_snr() {
+	return d_snr;
+}