mirror of https://github.com/gnss-sdr/gnss-sdr
96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
/*!
|
|
* \file beamformer.cc
|
|
*
|
|
* \brief Unpacks byte samples to NSR 2 bits samples
|
|
* \author Javier Arribas jarribas (at) cttc.es
|
|
* -------------------------------------------------------------------------
|
|
*
|
|
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
|
|
*
|
|
* GNSS-SDR is a software defined Global Navigation
|
|
* Satellite Systems receiver
|
|
*
|
|
* This file is part of GNSS-SDR.
|
|
*
|
|
* GNSS-SDR 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.
|
|
*
|
|
* GNSS-SDR 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 GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
#include "beamformer.h"
|
|
#include <gnuradio/io_signature.h>
|
|
#include <sstream>
|
|
|
|
|
|
#define GNSS_SDR_BEAMFORMER_CHANNELS 8
|
|
|
|
beamformer_sptr make_beamformer()
|
|
{
|
|
return beamformer_sptr(new beamformer());
|
|
}
|
|
|
|
|
|
beamformer::beamformer()
|
|
: gr::sync_block("beamformer",
|
|
gr::io_signature::make(GNSS_SDR_BEAMFORMER_CHANNELS, GNSS_SDR_BEAMFORMER_CHANNELS,sizeof(gr_complex)),
|
|
gr::io_signature::make(1, 1,sizeof(gr_complex)))
|
|
{
|
|
//initialize weight vector
|
|
|
|
if (posix_memalign((void**)&weight_vector, 16, GNSS_SDR_BEAMFORMER_CHANNELS * sizeof(gr_complex)) == 0){};
|
|
|
|
for (int i = 0; i< GNSS_SDR_BEAMFORMER_CHANNELS; i++)
|
|
{
|
|
weight_vector[i] = gr_complex(1,0);
|
|
}
|
|
}
|
|
|
|
|
|
beamformer::~beamformer()
|
|
{
|
|
free(weight_vector);
|
|
}
|
|
|
|
|
|
int beamformer::work(int noutput_items,gr_vector_const_void_star &input_items,
|
|
gr_vector_void_star &output_items)
|
|
{
|
|
gr_complex *out = reinterpret_cast<gr_complex *>(output_items[0]);
|
|
// channel output buffers
|
|
// gr_complex *ch1 = (gr_complex *) input_items[0];
|
|
// gr_complex *ch2 = (gr_complex *) input_items[1];
|
|
// gr_complex *ch3 = (gr_complex *) input_items[2];
|
|
// gr_complex *ch4 = (gr_complex *) input_items[3];
|
|
// gr_complex *ch5 = (gr_complex *) input_items[4];
|
|
// gr_complex *ch6 = (gr_complex *) input_items[5];
|
|
// gr_complex *ch7 = (gr_complex *) input_items[6];
|
|
// gr_complex *ch8 = (gr_complex *) input_items[7];
|
|
|
|
// NON-VOLK beamforming operation
|
|
//TODO: Implement VOLK SIMD-accelerated beamformer!
|
|
gr_complex sum;
|
|
for(int n = 0; n < noutput_items; n++)
|
|
{
|
|
sum = gr_complex(0,0);
|
|
for (int i = 0; i < GNSS_SDR_BEAMFORMER_CHANNELS; i++)
|
|
{
|
|
sum = sum + (reinterpret_cast<const gr_complex *>(input_items[i]))[n] * weight_vector[i];
|
|
}
|
|
out[n] = sum;
|
|
}
|
|
|
|
return noutput_items;
|
|
}
|