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/*!
* \file
* \brief Implementation of spread spectrum classes and functions
* \author Tony Ottosson
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2010 (see AUTHORS file for a list of contributors)
*
* This file is part of IT++ - a C++ library of mathematical, signal
* processing, speech processing, and communications classes and functions.
*
* IT++ 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.
*
* IT++ 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 IT++. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include <itpp/comm/spread.h>
#include <itpp/base/converters.h>
#include <itpp/stat/misc_stat.h>
namespace itpp
{
//------------- Spread1d -------------------
Spread_1d::Spread_1d(const vec &incode)
{
set_code(incode);
}
void Spread_1d::set_code(const vec &incode)
{
N = incode.size();
code = incode;
code /= norm(code);
}
vec Spread_1d::get_code()
{
return code;
}
void Spread_1d::spread(const vec &symbols, vec &out)
{
out.set_size(symbols.length()*N, false);
for (int i = 0;i < symbols.length();i++)
out.replace_mid(i*N, symbols(i)*code);
}
void Spread_1d::despread(const vec &rec_signal, vec &out, int timing)
{
int nosymbols = (int)std::floor(double((rec_signal.length() - timing)) / N);
out.set_size(nosymbols);
for (int i = 0;i < nosymbols;i++)
out(i) = rec_signal.mid(i * N + timing, N) * code;
}
//---------------- Spread2d ----------------------
vec Spread_2d::get_codeI()
{
return spreadI.get_code();
}
vec Spread_2d::get_codeQ()
{
return spreadQ.get_code();
}
Spread_2d::Spread_2d(const vec &incodeI, const vec &incodeQ)
{
set_code(incodeI, incodeQ);
}
void Spread_2d::set_code(const vec &incodeI, const vec &incodeQ)
{
it_assert(incodeI.length() == incodeQ.length(), "Size of I and Q codes doesn't match");
spreadI.set_code(incodeI);
spreadQ.set_code(incodeQ);
}
void Spread_2d::spread(const cvec &symbols, cvec &out)
{
out = to_cvec(spreadI.spread(real(symbols)), spreadQ.spread(imag(symbols)));
}
void Spread_2d::despread(const cvec &rec_signal, cvec &out, int timing)
{
out = to_cvec(spreadI.despread(real(rec_signal), timing), spreadQ.despread(imag(rec_signal), timing));
}
//------------- Multicode_Spread_1d ----------------
Multicode_Spread_1d::Multicode_Spread_1d(const mat &incodes)
{
set_codes(incodes);
}
void Multicode_Spread_1d::set_codes(const mat &incodes)
{
codes = incodes;
N = incodes.cols();
L = incodes.rows();
for (int i = 0; i < L; i++)
codes.set_row(i, codes.get_row(i) / norm(codes.get_row(i)));
}
mat Multicode_Spread_1d::get_codes()
{
return codes;
}
vec Multicode_Spread_1d::spread(const vec &symbols)
{
int i;
int nomcsymbols = (int)std::floor(double(symbols.length() / L));
vec temp(nomcsymbols*N);
for (i = 0;i < nomcsymbols;i++) {
temp.replace_mid(i*N, codes.T() * symbols.mid(i*L, L)); // TODO: this is now very slow
}
return temp;
}
vec Multicode_Spread_1d::despread(const vec &receivedsignal, int timing)
{
int i;
int nosymbols = (int)std::floor(double((receivedsignal.length() - timing)) / N);
vec temp(nosymbols*L);
for (i = 0;i < nosymbols;i++) {
temp.replace_mid(i*L, codes*receivedsignal.mid(i*N + timing, N));
}
return temp;
}
//----------------- Multicode_Spread_2d -------------------
Multicode_Spread_2d::Multicode_Spread_2d(const mat &incodesI, const mat &incodesQ)
{
set_codes(incodesI, incodesQ);
}
mat Multicode_Spread_2d::get_codesI()
{
return mcspreadI.get_codes();
}
mat Multicode_Spread_2d::get_codesQ()
{
return mcspreadQ.get_codes();
}
void Multicode_Spread_2d::set_codes(const mat &incodesI, const mat &incodesQ)
{
it_assert(incodesI.rows() == incodesQ.rows() && incodesI.cols() == incodesQ.cols(),
"Multicode_Spread_2d::set_codes(): dimension mismatch");
mcspreadI.set_codes(incodesI);
mcspreadQ.set_codes(incodesQ);
}
cvec Multicode_Spread_2d::spread(const cvec &symbols)
{
return to_cvec(mcspreadI.spread(real(symbols)), mcspreadQ.spread(imag(symbols)));
}
cvec Multicode_Spread_2d::despread(const cvec &receivedsignal, int timing)
{
return to_cvec(mcspreadI.despread(real(receivedsignal), timing), mcspreadQ.despread(imag(receivedsignal), timing));
}
} // namespace itpp
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