add ofdm_utils

2013-07-16 12:40:23 +02:00
parent c93baa0e2d
commit 1697580274
3 changed files with 213 additions and 0 deletions
@@ -0,0 +1,88 @@
+/*
+ * 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/>.
+ */
+#ifndef INCLUDED_IEEE802_11_OFDM_UTILS_H
+#define INCLUDED_IEEE802_11_OFDM_UTILS_H
+
+#include <ieee802-11/api.h>
+
+/**
+ * Define structure for the MAC header of a data frame.
+ * Values as stored as MSB, but standard mandates LSB
+ * representation. Bit utils functions can help changing
+ * endiannes
+ */
+struct MAC_DATAFRAME_HEADER {
+    char frame_control[2];  //protocol version, type, subtype, to_ds, from_ds, ...
+    char duration[2];       //duration field
+    char address1[6];       //address 1 indicating BSSID: 6 bytes MAC address
+    char address2[6];       //address 2 indicating receiver
+    char address3[6];       //address 3 indicating sender
+    char sequence[2];       //sequence number plus fragment number
+};
+
+enum ENCODING {
+	BPSK_1_2  = 0,
+	BPSK_3_4  = 1,
+	QPSK_1_2  = 2,
+	QPSK_3_4  = 3,
+	QAM16_1_2 = 4,
+	QAM16_3_4 = 5,
+	QAM64_2_3 = 6,
+	QAM64_3_4 = 7,
+};
+
+/**
+ * OFDM parameters
+ */
+class ofdm_param {
+public:
+	ofdm_param(ENCODING e);
+
+	// data rate
+	ENCODING encoding;
+	// rate field of the SIGNAL header
+	char     rate_field;
+	// number of coded bits per sub carrier
+	int      n_bpsc;
+	// number of coded bits per OFDM symbol
+	int      n_cbps;
+	// number of data bits per OFDM symbol
+	int      n_dbps;
+
+	void print_out();
+};
+
+/**
+ * packet specific parameters
+ */
+class tx_param {
+public:
+	tx_param(ofdm_param &ofdm, int psdu_length);
+	// PSDU size in bytes
+	int psdu_size;
+	// number of OFDM symbols (17-11)
+	int n_sym;
+	// number of data bits in the DATA field, including service and padding (17-12)
+	int n_data;
+	// number of padding bits in the DATA field (17-13)
+	int n_pad;
+	int n_encoded_bits;
+
+	void print_out();
+};
+
+#endif /* INCLUDED_IEEE802_11_OFDM_UTILS_H */