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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 <gr_io_signature.h>
#include "digital_ofdm_carrier_allocator_cvc.h"
digital_ofdm_carrier_allocator_cvc_sptr
digital_make_ofdm_carrier_allocator_cvc (
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,
const std::string &len_tag_key)
{
return gnuradio::get_initial_sptr (new digital_ofdm_carrier_allocator_cvc(fft_len, occupied_carriers, pilot_carriers, pilot_symbols, len_tag_key));
}
digital_ofdm_carrier_allocator_cvc::digital_ofdm_carrier_allocator_cvc (
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,
const std::string &len_tag_key)
: gr_tagged_stream_block ("ofdm_carrier_allocator_cvc",
gr_make_io_signature(1, 1, sizeof (gr_complex)),
gr_make_io_signature(1, 1, sizeof (gr_complex) * fft_len), len_tag_key),
d_fft_len(fft_len),
d_occupied_carriers(occupied_carriers),
d_pilot_carriers(pilot_carriers),
d_pilot_symbols(pilot_symbols),
d_symbols_per_set(0)
{
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
for (unsigned j = 0; j < d_occupied_carriers[i].size(); j++) {
if (occupied_carriers[i][j] < 0) {
d_occupied_carriers[i][j] += d_fft_len;
}
if (d_occupied_carriers[i][j] > d_fft_len || d_occupied_carriers[i][j] < 0) {
throw std::invalid_argument("data carrier index out of bounds");
}
}
}
for (unsigned i = 0; i < d_pilot_carriers.size(); i++) {
if (d_pilot_carriers[i].size() != pilot_symbols[i].size()) {
throw std::invalid_argument("pilot_carriers do not match pilot_symbols");
}
for (unsigned j = 0; j < d_pilot_carriers[i].size(); j++) {
if (d_pilot_carriers[i][j] < 0) {
d_pilot_carriers[i][j] += d_fft_len;
}
if (d_pilot_carriers[i][j] > d_fft_len || d_pilot_carriers[i][j] < 0) {
throw std::invalid_argument("pilot carrier index out of bounds");
}
}
}
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
d_symbols_per_set += d_occupied_carriers[i].size();
}
set_tag_propagation_policy(TPP_DONT);
set_relative_rate((double) d_symbols_per_set / d_occupied_carriers.size());
}
digital_ofdm_carrier_allocator_cvc::~digital_ofdm_carrier_allocator_cvc()
{
}
int
digital_ofdm_carrier_allocator_cvc::calculate_output_stream_length(const gr_vector_int &ninput_items)
{
int nin = ninput_items[0];
int nout = (nin / d_symbols_per_set) * d_occupied_carriers.size();
int k = 0;
for (int i = 0; i < nin % d_symbols_per_set; k++) {
nout++;
i += d_occupied_carriers[k % d_occupied_carriers.size()].size();
}
return nout;
}
int
digital_ofdm_carrier_allocator_cvc::work (int noutput_items,
gr_vector_int &ninput_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];
std::vector<gr_tag_t> tags;
memset((void *) out, 0x00, sizeof(gr_complex) * d_fft_len * noutput_items);
long n_ofdm_symbols = 0;
int curr_set = 0;
int symbols_to_allocate = d_occupied_carriers[0].size();
int symbols_allocated = 0;
for (int i = 0; i < ninput_items[0]; i++) {
if (symbols_allocated == 0) {
// Copy all tags associated with these input symbols onto this OFDM symbol
get_tags_in_range(tags, 0,
nitems_read(0)+i,
nitems_read(0)+std::min(i+symbols_to_allocate, (int) ninput_items[0])
);
for (unsigned t = 0; t < tags.size(); t++) {
add_item_tag(0, nitems_written(0)+n_ofdm_symbols,
tags[t].key,
tags[t].value);
}
n_ofdm_symbols++;
}
out[(n_ofdm_symbols-1) * d_fft_len + d_occupied_carriers[curr_set][symbols_allocated]] = in[i];
symbols_allocated++;
if (symbols_allocated == symbols_to_allocate) {
curr_set = (curr_set + 1) % d_occupied_carriers.size();
symbols_to_allocate = d_occupied_carriers[curr_set].size();
symbols_allocated = 0;
}
}
// 2) Copy pilot symbols
curr_set = 0;
for (int i = 0; i < n_ofdm_symbols; i++) {
for (unsigned k = 0; k < d_pilot_carriers[curr_set].size(); k++) {
out[i * d_fft_len + d_pilot_carriers[curr_set][k]] = d_pilot_symbols[curr_set][k];
}
curr_set = (curr_set + 1) % d_pilot_carriers.size();
}
return n_ofdm_symbols;
}
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