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ofdm_serializer_vcc_impl.cc
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ofdm_serializer_vcc_impl.cc
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/* -*- c++ -*- */
/* Copyright 2012,2014 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_serializer_vcc_impl.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace digital {
ofdm_serializer_vcc::sptr
ofdm_serializer_vcc::make(int fft_len,
const std::vector<std::vector<int>>& occupied_carriers,
const std::string& len_tag_key,
const std::string& packet_len_tag_key,
int symbols_skipped,
const std::string& carr_offset_key,
bool input_is_shifted)
{
return gnuradio::make_block_sptr<ofdm_serializer_vcc_impl>(fft_len,
occupied_carriers,
len_tag_key,
packet_len_tag_key,
symbols_skipped,
carr_offset_key,
input_is_shifted);
}
ofdm_serializer_vcc::sptr
ofdm_serializer_vcc::make(const gr::digital::ofdm_carrier_allocator_cvc::sptr& allocator,
const std::string& packet_len_tag_key,
int symbols_skipped,
const std::string& carr_offset_key,
bool input_is_shifted)
{
return gnuradio::make_block_sptr<ofdm_serializer_vcc_impl>(
allocator->fft_len(),
allocator->occupied_carriers(),
allocator->len_tag_key(),
packet_len_tag_key,
symbols_skipped,
carr_offset_key,
!input_is_shifted);
}
ofdm_serializer_vcc_impl::ofdm_serializer_vcc_impl(
int fft_len,
const std::vector<std::vector<int>>& occupied_carriers,
const std::string& len_tag_key,
const std::string& packet_len_tag_key,
int symbols_skipped,
const std::string& carr_offset_key,
bool input_is_shifted)
: tagged_stream_block("ofdm_serializer_vcc",
io_signature::make(1, 1, sizeof(gr_complex) * fft_len),
io_signature::make(1, 1, sizeof(gr_complex)),
len_tag_key),
d_fft_len(fft_len),
d_occupied_carriers(occupied_carriers),
d_packet_len_tag_key(pmt::string_to_symbol(packet_len_tag_key)),
d_out_len_tag_key(pmt::string_to_symbol(
(packet_len_tag_key.empty() ? len_tag_key : packet_len_tag_key))),
d_symbols_skipped(symbols_skipped % occupied_carriers.size()),
d_carr_offset_key(pmt::string_to_symbol(carr_offset_key)),
d_curr_set(symbols_skipped % occupied_carriers.size()),
d_symbols_per_set(0)
{
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
for (unsigned k = 0; k < d_occupied_carriers[i].size(); k++) {
if (input_is_shifted) {
d_occupied_carriers[i][k] += fft_len / 2;
if (d_occupied_carriers[i][k] > fft_len) {
d_occupied_carriers[i][k] -= fft_len;
}
} else {
if (d_occupied_carriers[i][k] < 0) {
d_occupied_carriers[i][k] += fft_len;
}
}
if (d_occupied_carriers[i][k] >= fft_len || d_occupied_carriers[i][k] < 0) {
throw std::invalid_argument("ofdm_serializer_vcc: trying to occupy a "
"carrier outside the fft length.");
}
}
}
for (unsigned i = 0; i < d_occupied_carriers.size(); i++) {
d_symbols_per_set += d_occupied_carriers[i].size();
}
set_relative_rate((uint64_t)d_symbols_per_set, (uint64_t)d_occupied_carriers.size());
set_tag_propagation_policy(TPP_DONT);
}
ofdm_serializer_vcc_impl::~ofdm_serializer_vcc_impl() {}
int ofdm_serializer_vcc_impl::calculate_output_stream_length(
const gr_vector_int& ninput_items)
{
int nout = (ninput_items[0] / d_occupied_carriers.size()) * d_symbols_per_set;
for (unsigned i = 0; i < ninput_items[0] % d_occupied_carriers.size(); i++) {
nout += d_occupied_carriers[(i + d_curr_set) % d_occupied_carriers.size()].size();
}
return nout;
}
void ofdm_serializer_vcc_impl::update_length_tags(int n_produced, int n_ports)
{
add_item_tag(0, nitems_written(0), d_out_len_tag_key, pmt::from_long(n_produced));
}
int ofdm_serializer_vcc_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];
long frame_length = ninput_items[0]; // Input frame
long packet_length = 0; // Output frame
int carr_offset = 0;
std::vector<tag_t> tags;
// Packet mode
if (!d_length_tag_key_str.empty()) {
get_tags_in_range(tags, 0, nitems_read(0), nitems_read(0) + 1);
for (unsigned i = 0; i < tags.size(); i++) {
if (tags[i].key == d_carr_offset_key) {
carr_offset = pmt::to_long(tags[i].value);
}
if (tags[i].key == d_packet_len_tag_key) {
packet_length = pmt::to_long(tags[i].value);
}
}
} else {
// recalc frame length from noutput_items
frame_length = 0;
int sym_per_frame = 0;
while ((sym_per_frame +
d_occupied_carriers[(frame_length + 1) % d_occupied_carriers.size()]
.size()) < (size_t)noutput_items) {
frame_length++;
sym_per_frame +=
d_occupied_carriers[(frame_length + 1) % d_occupied_carriers.size()]
.size();
}
}
// Copy symbols
int n_out_symbols = 0;
for (int i = 0; i < frame_length; i++) {
// Copy all tags associated with this input OFDM symbol onto the first output
// symbol
get_tags_in_range(tags, 0, nitems_read(0) + i, nitems_read(0) + i + 1);
for (size_t t = 0; t < tags.size(); t++) {
// The packet length tag is not propagated
if (tags[t].key != d_packet_len_tag_key) {
add_item_tag(
0, nitems_written(0) + n_out_symbols, tags[t].key, tags[t].value);
}
}
for (unsigned k = 0; k < d_occupied_carriers[d_curr_set].size(); k++) {
out[n_out_symbols++] =
in[i * d_fft_len + d_occupied_carriers[d_curr_set][k] + carr_offset];
}
if (packet_length && n_out_symbols > packet_length) {
n_out_symbols = packet_length;
break;
}
d_curr_set = (d_curr_set + 1) % d_occupied_carriers.size();
}
// Housekeeping
if (d_length_tag_key_str.empty()) {
consume_each(frame_length);
} else {
d_curr_set = d_symbols_skipped;
}
return n_out_symbols;
}
} /* namespace digital */
} /* namespace gr */