mirror of https://github.com/gnss-sdr/gnss-sdr
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/*!
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* \file beamformer.cc
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*
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* \brief Unpacks byte samples to NSR 2 bits samples
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* \author Javier Arribas jarribas (at) cttc.es
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2012 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* at your option) any later version.
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*
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* GNSS-SDR is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#include "beamformer.h"
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#include <iostream>
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#include <sstream>
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#include <gnuradio/io_signature.h>
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#define GNSS_SDR_BEAMFORMER_CHANNELS 8
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beamformer_sptr make_beamformer()
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{
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return beamformer_sptr(new beamformer());
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}
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beamformer::beamformer()
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: gr::sync_block("beamformer",
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gr::io_signature::make(GNSS_SDR_BEAMFORMER_CHANNELS, GNSS_SDR_BEAMFORMER_CHANNELS,sizeof(gr_complex)),
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gr::io_signature::make(1, 1,sizeof(gr_complex)))
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{
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//initialize weight vector
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if (posix_memalign((void**)&weight_vector, 16, GNSS_SDR_BEAMFORMER_CHANNELS * sizeof(gr_complex)) == 0){};
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for (int i=0;i<GNSS_SDR_BEAMFORMER_CHANNELS;i++)
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{
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weight_vector[i]=gr_complex(1,0);
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}
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}
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beamformer::~beamformer()
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{
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free(weight_vector);
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}
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int beamformer::work(int noutput_items,gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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gr_complex *out = (gr_complex *) output_items[0];
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// channel output buffers
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// gr_complex *ch1 = (gr_complex *) input_items[0];
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// gr_complex *ch2 = (gr_complex *) input_items[1];
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// gr_complex *ch3 = (gr_complex *) input_items[2];
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// gr_complex *ch4 = (gr_complex *) input_items[3];
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// gr_complex *ch5 = (gr_complex *) input_items[4];
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// gr_complex *ch6 = (gr_complex *) input_items[5];
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// gr_complex *ch7 = (gr_complex *) input_items[6];
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// gr_complex *ch8 = (gr_complex *) input_items[7];
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// NON-VOLK beamforming operation
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//TODO: Implement VOLK SIMD-accelerated beamformer!
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gr_complex sum;
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for(int n=0;n<noutput_items;n++)
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{
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sum=gr_complex(0,0);
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for (int i=0;i<GNSS_SDR_BEAMFORMER_CHANNELS;i++)
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{
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sum=sum+((gr_complex *) input_items[i])[n]*weight_vector[i];
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}
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out[n]=sum;
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}
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return noutput_items;
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}
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