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Adding 4 bits complex samples signal source

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This commit is contained in:
Javier Arribas 2022-05-20 10:40:30 +02:00
parent ac9b87b9a1
commit c97e12dbe0
6 changed files with 192 additions and 10 deletions
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2
src/algorithms/signal_source/adapters/CMakeLists.txt
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@ -99,6 +99,7 @@ set(SIGNAL_SOURCE_ADAPTER_SOURCES
labsat_signal_source.cc
two_bit_cpx_file_signal_source.cc
two_bit_packed_file_signal_source.cc
four_bit_cpx_file_signal_source.cc
file_timestamp_signal_source.cc
${OPT_DRIVER_SOURCES}
)
@ -117,6 +118,7 @@ set(SIGNAL_SOURCE_ADAPTER_HEADERS
labsat_signal_source.h
two_bit_cpx_file_signal_source.h
two_bit_packed_file_signal_source.h
four_bit_cpx_file_signal_source.h
file_timestamp_signal_source.h
${OPT_DRIVER_HEADERS}
)

102
src/algorithms/signal_source/adapters/four_bit_cpx_file_signal_source.cc Normal file
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@ -0,0 +1,102 @@
/*!
* \file four_bit_cpx_file_signal_source.cc
* \brief Implementation of a class that reads signals samples from a 2 bit complex sampler front-end file
* and adapts it to a SignalSourceInterface.
* \author Javier Arribas, 2015 jarribas(at)cttc.es
*
* -----------------------------------------------------------------------------
*
* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
* This file is part of GNSS-SDR.
*
* Copyright (C) 2010-2021 (see AUTHORS file for a list of contributors)
* SPDX-License-Identifier: GPL-3.0-or-later
*
* -----------------------------------------------------------------------------
*/
#include "four_bit_cpx_file_signal_source.h"
#include "configuration_interface.h"
#include "gnss_sdr_string_literals.h"
#include <glog/logging.h>
using namespace std::string_literals;
FourBitCpxFileSignalSource::FourBitCpxFileSignalSource(
const ConfigurationInterface* configuration,
const std::string& role,
unsigned int in_streams, unsigned int out_streams,
Concurrent_Queue<pmt::pmt_t>* queue)
: FileSourceBase(configuration, role, "Four_Bit_Cpx_File_Signal_Source"s, queue, "byte"s)
{
sample_type_ = configuration->property(role + ".sample_type", "iq"s);
// the complex-ness of the input is inferred from the output type
if (sample_type_ == "iq")
{
reverse_interleaving_ = false;
}
else if (sample_type_ == "qi")
{
reverse_interleaving_ = true;
}
else
{
LOG(WARNING) << sample_type_ << " unrecognized sample type. Assuming: ";
}
if (in_streams > 0)
{
LOG(ERROR) << "A signal source does not have an input stream";
}
if (out_streams > 1)
{
LOG(ERROR) << "This implementation only supports one output stream";
}
}
std::tuple<size_t, bool> FourBitCpxFileSignalSource::itemTypeToSize()
{
auto is_complex = false;
auto item_size = size_t(sizeof(char)); // default
if (item_type() == "byte")
{
item_size = sizeof(char);
}
else
{
LOG(WARNING) << item_type() << " unrecognized item type. Using byte.";
}
return std::make_tuple(item_size, is_complex);
}
// 1 byte -> 1 complex samples
double FourBitCpxFileSignalSource::packetsPerSample() const { return 1.0; }
gnss_shared_ptr<gr::block> FourBitCpxFileSignalSource::source() const { return inter_shorts_to_cpx_; }
void FourBitCpxFileSignalSource::create_file_source_hook()
{
unpack_byte_ = make_unpack_byte_4bit_samples();
DLOG(INFO) << "unpack_byte_2bit_cpx_samples(" << unpack_byte_->unique_id() << ")";
inter_shorts_to_cpx_ = gr::blocks::interleaved_short_to_complex::make(false, reverse_interleaving_); // I/Q swap enabled
DLOG(INFO) << "interleaved_short_to_complex(" << inter_shorts_to_cpx_->unique_id() << ")";
}
void FourBitCpxFileSignalSource::pre_connect_hook(gr::top_block_sptr top_block)
{
top_block->connect(file_source(), 0, unpack_byte_, 0);
top_block->connect(unpack_byte_, 0, inter_shorts_to_cpx_, 0);
DLOG(INFO) << "connected file_source to unpacker";
}
void FourBitCpxFileSignalSource::pre_disconnect_hook(gr::top_block_sptr top_block)
{
top_block->disconnect(file_source(), 0, unpack_byte_, 0);
top_block->disconnect(unpack_byte_, 0, inter_shorts_to_cpx_, 0);
DLOG(INFO) << "disconnected file_source from unpacker";
}

71
src/algorithms/signal_source/adapters/four_bit_cpx_file_signal_source.h Normal file
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@ -0,0 +1,71 @@
/*!
* \file FOUR_BIT_cpx_file_signal_source.h
* \brief Interface of a class that reads signals samples from a 2 bit complex sampler front-end file
* and adapts it to a SignalSourceInterface.
* \author Javier Arribas, 2015 jarribas(at)cttc.es
*
* This class represents a file signal source.
*
* -----------------------------------------------------------------------------
*
* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
* This file is part of GNSS-SDR.
*
* Copyright (C) 2010-2021 (see AUTHORS file for a list of contributors)
* SPDX-License-Identifier: GPL-3.0-or-later
*
* -----------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_FOUR_BIT_CPX_FILE_SIGNAL_SOURCE_H
#define GNSS_SDR_FOUR_BIT_CPX_FILE_SIGNAL_SOURCE_H
#include "file_source_base.h"
#include "unpack_byte_4bit_samples.h"
#include <gnuradio/blocks/interleaved_short_to_complex.h>
#include <cstddef>
#include <string>
#include <tuple>
/** \addtogroup Signal_Source
* \{ */
/** \addtogroup Signal_Source_adapters
* \{ */
class ConfigurationInterface;
/*!
* \brief Class that reads signals samples from a file
* and adapts it to a SignalSourceInterface
*/
class FourBitCpxFileSignalSource : public FileSourceBase
{
public:
FourBitCpxFileSignalSource(const ConfigurationInterface* configuration,
const std::string& role,
unsigned int in_streams,
unsigned int out_streams,
Concurrent_Queue<pmt::pmt_t>* queue);
~FourBitCpxFileSignalSource() = default;
protected:
std::tuple<size_t, bool> itemTypeToSize() override;
double packetsPerSample() const override;
gnss_shared_ptr<gr::block> source() const override;
void create_file_source_hook() override;
void pre_connect_hook(gr::top_block_sptr top_block) override;
void pre_disconnect_hook(gr::top_block_sptr top_block) override;
private:
unpack_byte_4bit_samples_sptr unpack_byte_;
gr::blocks::interleaved_short_to_complex::sptr inter_shorts_to_cpx_;
std::string sample_type_;
bool reverse_interleaving_;
};
/** \} */
/** \} */
#endif // GNSS_SDR_FOUR_BIT_CPX_FILE_SIGNAL_SOURCE_H

16
src/algorithms/signal_source/gnuradio_blocks/unpack_byte_4bit_samples.cc
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@ -26,8 +26,8 @@ unpack_byte_4bit_samples_sptr make_unpack_byte_4bit_samples()
unpack_byte_4bit_samples::unpack_byte_4bit_samples() : sync_interpolator("unpack_byte_4bit_samples",
gr::io_signature::make(1, 1, sizeof(signed char)),
gr::io_signature::make(1, 1, sizeof(signed char)),
gr::io_signature::make(1, 1, sizeof(int8_t)),
gr::io_signature::make(1, 1, sizeof(int16_t)),
2)
{
}
@ -37,8 +37,8 @@ int unpack_byte_4bit_samples::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const auto *in = reinterpret_cast<const signed char *>(input_items[0]);
auto *out = reinterpret_cast<signed char *>(output_items[0]);
const auto *in = reinterpret_cast<const int8_t *>(input_items[0]);
auto *out = reinterpret_cast<int16_t *>(output_items[0]);
int n = 0;
unsigned char tmp_char2;
for (int i = 0; i < noutput_items / 2; i++)
@ -46,21 +46,21 @@ int unpack_byte_4bit_samples::work(int noutput_items,
tmp_char2 = in[i] & 0x0F;
if (tmp_char2 >= 8)
{
out[n++] = 2 * (tmp_char2 - 16) + 1;
out[n++] = static_cast<int16_t>(2 * (tmp_char2 - 16) + 1);
}
else
{
out[n++] = 2 * tmp_char2 + 1;
out[n++] = static_cast<int16_t>(2 * tmp_char2 + 1);
}
tmp_char2 = in[i] >> 4;
tmp_char2 = tmp_char2 & 0x0F;
if (tmp_char2 >= 8)
{
out[n++] = 2 * (tmp_char2 - 16) + 1;
out[n++] = static_cast<int16_t>(2 * (tmp_char2 - 16) + 1);
}
else
{
out[n++] = 2 * tmp_char2 + 1;
out[n++] = static_cast<int16_t>(2 * tmp_char2 + 1);
}
}
return noutput_items;

4
src/algorithms/signal_source/gnuradio_blocks/unpack_byte_4bit_samples.h
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@ -20,8 +20,8 @@
#ifndef GNSS_SDR_UNPACK_BYTE_4BIT_SAMPLES_H
#define GNSS_SDR_UNPACK_BYTE_4BIT_SAMPLES_H
#include "gnss_block_interface.h"
#include <gnuradio/sync_interpolator.h>
#include <memory>
/** \addtogroup Signal_Source
* \{ */
@ -31,7 +31,7 @@
class unpack_byte_4bit_samples;
using unpack_byte_4bit_samples_sptr = std::shared_ptr<unpack_byte_4bit_samples>;
using unpack_byte_4bit_samples_sptr = gnss_shared_ptr<unpack_byte_4bit_samples>;
unpack_byte_4bit_samples_sptr make_unpack_byte_4bit_samples();

7
src/core/receiver/gnss_block_factory.cc
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@ -41,6 +41,7 @@
#include "file_signal_source.h"
#include "file_timestamp_signal_source.h"
#include "fir_filter.h"
#include "four_bit_cpx_file_signal_source.h"
#include "freq_xlating_fir_filter.h"
#include "galileo_e1_dll_pll_veml_tracking.h"
#include "galileo_e1_pcps_8ms_ambiguous_acquisition.h"
@ -694,6 +695,12 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetBlock(
out_streams, queue);
block = std::move(block_);
}
else if (implementation == "Four_Bit_Cpx_File_Signal_Source")
{
std::unique_ptr<GNSSBlockInterface> block_ = std::make_unique<FourBitCpxFileSignalSource>(configuration, role, in_streams,
out_streams, queue);
block = std::move(block_);
}
else if (implementation == "Two_Bit_Packed_File_Signal_Source")
{
std::unique_ptr<GNSSBlockInterface> block_ = std::make_unique<TwoBitPackedFileSignalSource>(configuration, role, in_streams,