/*
 * 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 "ofdm_utils.h"

#include <boost/crc.hpp>
#include <cassert>
#include <cstring>
#include <iostream>
#include <math.h>


ofdm_param::ofdm_param(ENCODING e) {
	encoding = e;

	switch(e) {
		case BPSK_1_2:
			n_bpsc = 1;
			n_cbps = 48;
			n_dbps = 24;
			rate_field = 0x0D; // 0b00001101
			break;

		case BPSK_3_4:
			n_bpsc = 1;
			n_cbps = 48;
			n_dbps = 36;
			rate_field = 0x0F; // 0b00001111
			break;

		case QPSK_1_2:
			n_bpsc = 2;
			n_cbps = 96;
			n_dbps = 48;
			rate_field = 0x05; // 0b00000101
			break;

		case QPSK_3_4:
			n_bpsc = 2;
			n_cbps = 96;
			n_dbps = 72;
			rate_field = 0x07; // 0b00000111
			break;

		case QAM16_1_2:
			n_bpsc = 4;
			n_cbps = 192;
			n_dbps = 96;
			rate_field = 0x09; // 0b00001001
			break;

		case QAM16_3_4:
			n_bpsc = 4;
			n_cbps = 192;
			n_dbps = 144;
			rate_field = 0x0B; // 0b00001011
			break;

		case QAM64_2_3:
			n_bpsc = 6;
			n_cbps = 288;
			n_dbps = 192;
			rate_field = 0x01; // 0b00000001
			break;

		case QAM64_3_4:
			n_bpsc = 6;
			n_cbps = 288;
			n_dbps = 216;
			rate_field = 0x03; // 0b00000011
			break;
		defaut:
			assert(false);
			break;
	}
}

void
ofdm_param::print_out() {
	std::cout << "OFDM Parameters:" << std::endl;
	std::cout << "endcoding :" << encoding << std::endl;
	std::cout << "rate_field :" << (int)rate_field << std::endl;
	std::cout << "n_bpsc :" << n_bpsc << std::endl;
	std::cout << "n_cbps :" << n_cbps << std::endl;
	std::cout << "n_dbps :" << n_dbps << std::endl;
}

tx_param::tx_param(ofdm_param &ofdm, int psdu_length) {

	psdu_size = psdu_length;

	// number of symbols (17-11)
	n_sym = (int) ceil((16 + 8 * psdu_size + 6) / (double) ofdm.n_dbps);

	// number of bits of the data field (17-12)
	n_data = n_sym * ofdm.n_dbps;

	// number of padding bits (17-13)
	n_pad = n_data - (16 + 8 * psdu_size + 6);

	n_encoded_bits = n_sym * ofdm.n_cbps;
}
void
tx_param::print_out() {
	std::cout << "TX Parameters:" << std::endl;
	std::cout << "psdu_size: " << psdu_size << std::endl;
	std::cout << "n_sym: " << n_sym << std::endl;
	std::cout << "n_data: " << n_data << std::endl;
	std::cout << "n_pad: " << n_pad << std::endl;
}