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/* -*- c++ -*- */
/*
* Copyright 2013, 2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ofdm_carrier_allocator_cvc_impl.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace digital {
ofdm_carrier_allocator_cvc::sptr ofdm_carrier_allocator_cvc::make(
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::vector<std::vector<gr_complex>>& sync_words,
const std::string& len_tag_key,
const bool output_is_shifted)
{
return gnuradio::make_block_sptr<ofdm_carrier_allocator_cvc_impl>(fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols,
sync_words,
len_tag_key,
output_is_shifted);
}
ofdm_carrier_allocator_cvc_impl::ofdm_carrier_allocator_cvc_impl(
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::vector<std::vector<gr_complex>>& sync_words,
const std::string& len_tag_key,
const bool output_is_shifted)
: tagged_stream_block("ofdm_carrier_allocator_cvc",
io_signature::make(1, 1, sizeof(gr_complex)),
io_signature::make(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_sync_words(sync_words),
d_symbols_per_set(0),
d_output_is_shifted(output_is_shifted)
{
// Sanity checks
// If that is is null, the input is wrong -> force user to use ((),) in python
if (d_occupied_carriers.empty()) {
throw std::invalid_argument(
"Occupied carriers must be of type vector of vector i.e. ((),).");
}
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");
}
if (d_output_is_shifted) {
d_occupied_carriers[i][j] =
(d_occupied_carriers[i][j] + fft_len / 2) % fft_len;
}
}
}
if (d_pilot_carriers.empty()) {
throw std::invalid_argument(
"Pilot carriers must be of type vector of vector i.e. ((),).");
}
for (unsigned i = 0; i < d_pilot_carriers.size(); i++) {
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");
}
if (d_output_is_shifted) {
d_pilot_carriers[i][j] = (d_pilot_carriers[i][j] + fft_len / 2) % fft_len;
}
}
}
if (d_pilot_symbols.empty()) {
throw std::invalid_argument(
"Pilot symbols must be of type vector of vector i.e. ((),).");
}
for (unsigned i = 0; i < std::max(d_pilot_carriers.size(), d_pilot_symbols.size());
i++) {
if (d_pilot_carriers[i % d_pilot_carriers.size()].size() !=
d_pilot_symbols[i % d_pilot_symbols.size()].size()) {
throw std::invalid_argument("pilot_carriers do not match pilot_symbols");
}
}
for (unsigned i = 0; i < d_sync_words.size(); i++) {
if (d_sync_words[i].size() != (unsigned)d_fft_len) {
throw std::invalid_argument("sync words must be fft length");
}
}
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((uint64_t)d_symbols_per_set, (uint64_t)d_occupied_carriers.size());
}
ofdm_carrier_allocator_cvc_impl::~ofdm_carrier_allocator_cvc_impl() {}
int ofdm_carrier_allocator_cvc_impl::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 + d_sync_words.size();
}
int ofdm_carrier_allocator_cvc_impl::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<tag_t> tags;
memset((void*)out, 0x00, sizeof(gr_complex) * d_fft_len * noutput_items);
// Copy Sync word
for (unsigned i = 0; i < d_sync_words.size(); i++) {
memcpy((void*)out, (void*)&d_sync_words[i][0], sizeof(gr_complex) * d_fft_len);
out += d_fft_len;
}
// Copy data symbols
long n_ofdm_symbols = 0; // Number of output items
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 +
(n_ofdm_symbols == 0 ? 0 : d_sync_words.size()),
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;
}
}
// Copy pilot symbols
for (int i = 0; i < n_ofdm_symbols; i++) {
for (unsigned k = 0; k < d_pilot_carriers[i % d_pilot_carriers.size()].size();
k++) {
out[i * d_fft_len + d_pilot_carriers[i % d_pilot_carriers.size()][k]] =
d_pilot_symbols[i % d_pilot_symbols.size()][k];
}
}
return n_ofdm_symbols + d_sync_words.size();
}
} // namespace digital
} // namespace gr
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