mirror of
https://github.com/DSheirer/sdrtrunk.git
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74 lines
2.2 KiB
Java
74 lines
2.2 KiB
Java
/*******************************************************************************
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* sdr-trunk
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* Copyright (C) 2014-2018 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 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 along with this program.
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* If not, see <http://www.gnu.org/licenses/>
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*
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******************************************************************************/
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package io.github.dsheirer.dsp.psk;
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import io.github.dsheirer.dsp.symbol.Dibit;
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import io.github.dsheirer.sample.Broadcaster;
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import io.github.dsheirer.sample.Listener;
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import io.github.dsheirer.sample.complex.Complex;
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public class QPSKStarSlicer implements IQPSKSymbolDecoder, Listener<Complex>
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{
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private Broadcaster<Dibit> mBroadcaster = new Broadcaster<Dibit>();
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/**
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* Slices a Complex sample representing a phase shifted symbol according to the following constellation pattern:
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*
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* 00 +3 | 01 +1
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* ------|------
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* 10 -1 | 11 -1
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*/
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public QPSKStarSlicer()
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{
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}
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public void dispose()
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{
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mBroadcaster.dispose();
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mBroadcaster = null;
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}
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public void addListener(Listener<Dibit> listener)
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{
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mBroadcaster.addListener(listener);
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}
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public void removeListener(Listener<Dibit> listener)
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{
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mBroadcaster.removeListener(listener);
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}
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@Override
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public void receive(Complex sample)
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{
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mBroadcaster.broadcast(decode(sample));
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}
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@Override
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public Dibit decode(Complex sample)
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{
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if(sample.inphase() > 0)
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{
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return sample.quadrature() > 0 ? Dibit.D00_PLUS_1 : Dibit.D10_MINUS_1;
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}
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else
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{
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return sample.quadrature() > 0 ? Dibit.D01_PLUS_3 : Dibit.D11_MINUS_3;
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}
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}
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}
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