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#296 APCO25 Phase II Decoder Implementation (#589)

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P25 Phase 2 Decoder implementation.
This commit is contained in:
Denny Sheirer
2019-11-17 06:56:52 -05:00
committed by GitHub
parent d5b802e794
commit f934676bd0
561 changed files with 35609 additions and 6215 deletions
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60
src/main/java/io/github/dsheirer/edac/BerlekempMassey_63.java
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@@ -1,43 +1,27 @@
/*
*
* * ******************************************************************************
* * Copyright (C) 2014-2019 Dennis Sheirer
* *
* * This program 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.
* *
* * This program 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 this program. If not, see <http://www.gnu.org/licenses/>
* * *****************************************************************************
*
*
*/
package io.github.dsheirer.edac;
/*******************************************************************************
* SDR Trunk
* Copyright (C) 2014 Dennis Sheirer
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>
*
* --------------------------------------------------------------------
* Based on Ed Fuentetaja's DSD RS decoder, May 2014, at:
* https://github.com/szechyjs/dsd/blob/master/ReedSolomon.hpp
* --------------------------------------------------------------------
* Adapted from Mr. Simon Rockliff's version at: http://www.eccpage.com/rs.c
*
* Simon Rockliff, University of Adelaide 21/9/89
* 26/6/91 Slight modifications to remove a compiler dependent bug which
* hadn't previously surfaced. A few extra comments added for clarity.
* Appears to all work fine, ready for posting to net!
*
* Notice
* --------
* This program may be freely modified and/or given to whoever wants it.
* A condition of such distribution is that the author's contribution be
* acknowledged by his name being left in the comments heading the program,
* however no responsibility is accepted for any financial or other loss which
* may result from some unforseen errors or malfunctioning of the program
* during use.
* Simon Rockliff, 26th June 1991
******************************************************************************/
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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src/main/java/io/github/dsheirer/edac/ReedSolomon_44_16_29.java Normal file
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/*
*
* * ******************************************************************************
* * Copyright (C) 2014-2019 Dennis Sheirer
* *
* * This program 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.
* *
* * This program 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 this program. If not, see <http://www.gnu.org/licenses/>
* * *****************************************************************************
*
*
*/
package io.github.dsheirer.edac;
public class ReedSolomon_44_16_29 extends BerlekempMassey_63
{
//Hamming distance = 29, so max correctable errors = 29 / 2 = 14
private static final int MAXIMUM_CORRECTABLE_ERRORS = 14;
public ReedSolomon_44_16_29()
{
super(MAXIMUM_CORRECTABLE_ERRORS);
}
}

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src/main/java/io/github/dsheirer/edac/ReedSolomon_63_35_29.java Normal file
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/*
*
* * ******************************************************************************
* * Copyright (C) 2014-2019 Dennis Sheirer
* *
* * This program 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.
* *
* * This program 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 this program. If not, see <http://www.gnu.org/licenses/>
* * *****************************************************************************
*
*
*/
package io.github.dsheirer.edac;
public class ReedSolomon_63_35_29 extends BerlekempMassey_63
{
/**
* Reed-Solomon RS(63,35,29) decoder. This can also be used for error detection and correction of the following
* RS codes:
*
* RS(46,26,21) - max 10 errors = P25P2 IEMI
* RS(45,26,20) - max 9 errors = P25P2 SOEMI (FACCH)
* RS(52,30,23) - max 11 errors = P25P2 IOEMI (SACCH)
* RS(44,16,29) - max 14 errors = P25P2 ESS
*
* The maximum correctable errors is determined by (n-k)/2, or hamming distance divided by 2.
*/
public ReedSolomon_63_35_29(int maximumCorrectableErrors)
{
super(maximumCorrectableErrors);
}
}