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11 [CQ DXcall DXgrid]. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6934 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
511 lines
15 KiB
C
511 lines
15 KiB
C
/*
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main.c
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QRA64 mode encode/decode test
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(c) 2016 - Nico Palermo, IV3NWV
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Thanks to Andrea Montefusco IW0HDV for his help on adapting the sources
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to OSs other than MS Windows
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------------------------------------------------------------------------------
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This file is part of the qracodes project, a Forward Error Control
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encoding/decoding package based on Q-ary RA (Repeat and Accumulate) LDPC codes.
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Files in this package:
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main.c - this file
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qra64.c/.h - qra64 mode encode/decoding functions
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../qracodes/normrnd.{c,h} - random gaussian number generator
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../qracodes/npfwht.{c,h} - Fast Walsh-Hadamard Transforms
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../qracodes/pdmath.{c,h} - Elementary math on probability distributions
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../qracodes/qra12_63_64_irr_b.{c,h} - Tables for a QRA(12,63) irregular RA
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code over GF(64)
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../qracodes/qra13_64_64_irr_e.{c,h} - Tables for a QRA(13,64) irregular RA
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code over GF(64)
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../qracodes/qracodes.{c,h} - QRA codes encoding/decoding functions
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-------------------------------------------------------------------------------
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qracodes 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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qracodes 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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You should have received a copy of the GNU General Public License
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along with qracodes source distribution.
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If not, see <http://www.gnu.org/licenses/>.
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-----------------------------------------------------------------------------
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The code used by the QRA64 mode is the code: QRA13_64_64_IRR_E: K=13
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N=64 Q=64 irregular QRA code (defined in qra13_64_64_irr_e.{h,c}).
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This code has been designed to include a CRC as the 13th information
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symbol and improve the code UER (Undetected Error Rate). The CRC
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symbol is not sent along the channel (the codes are punctured) and the
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resulting code is still a (12,63) code with an effective code rate of
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R = 12/63.
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*/
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// OS dependent defines and includes ------------------------------------------
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#if _WIN32 // note the underscore: without it, it's not msdn official!
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// Windows (x64 and x86)
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#include <windows.h> // required only for GetTickCount(...)
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#include <process.h> // _beginthread
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#endif
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#if __linux__
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#include <unistd.h>
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#include <time.h>
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unsigned GetTickCount(void) {
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struct timespec ts;
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unsigned theTick = 0U;
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clock_gettime( CLOCK_REALTIME, &ts );
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theTick = ts.tv_nsec / 1000000;
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theTick += ts.tv_sec * 1000;
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return theTick;
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}
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#endif
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#if __APPLE__
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "qra64.h"
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#include "../qracodes/normrnd.h" // gaussian numbers generator
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// ----------------------------------------------------------------------------
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// channel types
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#define CHANNEL_AWGN 0
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#define CHANNEL_RAYLEIGH 1
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#define JT65_SNR_EBNO_OFFSET 29.1f // with the synch used in JT65
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#define QRA64_SNR_EBNO_OFFSET 31.0f // with the costas array synch
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void printwordd(char *msg, int *x, int size)
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{
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int k;
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printf("\n%s ",msg);
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for (k=0;k<size;k++)
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printf("%2d ",x[k]);
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printf("\n");
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}
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void printwordh(char *msg, int *x, int size)
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{
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int k;
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printf("\n%s ",msg);
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for (k=0;k<size;k++)
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printf("%02hx ",x[k]);
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printf("\n");
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}
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#define NSAMPLES (QRA64_N*QRA64_M)
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static float rp[NSAMPLES];
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static float rq[NSAMPLES];
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static float chp[NSAMPLES];
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static float chq[NSAMPLES];
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static float r[NSAMPLES];
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float *mfskchannel(int *x, int channel_type, float EbNodB)
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{
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/*
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Simulate an MFSK channel, either AWGN or Rayleigh.
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x is a pointer to the transmitted codeword, an array of QRA64_N
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integers in the range 0..63.
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Returns the received symbol energies (squared amplitudes) as an array of
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(QRA64_M*QRA64_N) floats. The first QRA64_M entries of this array are
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the energies of the first symbol in the codeword. The second QRA64_M
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entries are those of the second symbol, and so on up to the last codeword
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symbol.
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*/
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const float No = 1.0f; // noise spectral density
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const float sigma = (float)sqrt(No/2.0f); // std dev of noise I/Q components
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const float sigmach = (float)sqrt(1/2.0f); // std dev of channel I/Q gains
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const float R = 1.0f*QRA64_K/QRA64_N;
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float EbNo = (float)pow(10,EbNodB/10);
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float EsNo = 1.0f*QRA64_m*R*EbNo;
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float Es = EsNo*No;
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float A = (float)sqrt(Es);
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int k;
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normrnd_s(rp,NSAMPLES,0,sigma);
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normrnd_s(rq,NSAMPLES,0,sigma);
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if (channel_type == CHANNEL_AWGN)
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for (k=0;k<QRA64_N;k++)
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rp[k*QRA64_M+x[k]]+=A;
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else
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if (channel_type == CHANNEL_RAYLEIGH) {
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normrnd_s(chp,QRA64_N,0,sigmach);
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normrnd_s(chq,QRA64_N,0,sigmach);
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for (k=0;k<QRA64_N;k++) {
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rp[k*QRA64_M+x[k]]+=A*chp[k];
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rq[k*QRA64_M+x[k]]+=A*chq[k];
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}
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}
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else {
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return 0; // unknown channel type
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}
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// compute the squares of the amplitudes of the received samples
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for (k=0;k<NSAMPLES;k++)
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r[k] = rp[k]*rp[k] + rq[k]*rq[k];
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return r;
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}
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// These defines are some packed fields as computed by JT65
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#define CALL_IV3NWV 0x7F85AE7
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#define CALL_K1JT 0xF70DDD7
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#define GRID_JN66 0x3AE4 // JN66
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#define GRID_73 0x7ED0 // 73
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char decode_type[12][32] = {
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"[? ? ?] AP0",
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"[CQ ? ?] AP27",
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"[CQ ? ] AP42",
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"[CALL ? ?] AP29",
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"[CALL ? ] AP44",
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"[CALL CALL ?] AP57",
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"[? CALL ?] AP29",
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"[? CALL ] AP44",
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"[CALL CALL G] AP72",
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"[CQ CALL ?] AP55",
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"[CQ CALL ] AP70",
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"[CQ CALL G] AP70"
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};
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char apmode_type[3][32] = {
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"NO AP",
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"AUTO AP",
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"USER AP"
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};
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int test_proc_1(int channel_type, float EbNodB, int mode)
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{
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/*
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Here we simulate the following (dummy) QSO:
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1) CQ IV3NWV
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2) IV3NWV K1JT
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3) K1JT IV3NWV 73
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4) IV3NWV K1JT 73
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No message repetition is attempted
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The QSO is counted as successfull if IV3NWV received the last message
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When mode=QRA_AUTOAP each decoder attempts to decode the message sent
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by the other station using the a-priori information derived by what
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has been already decoded in a previous phase of the QSO if decoding
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with no a-priori information has not been successful.
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Step 1) K1JT's decoder first attempts to decode msgs of type [? ? ?]
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and if this attempt fails, it attempts to decode [CQ/QRZ ? ?] or
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[CQ/QRZ ?] msgs
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Step 2) if IV3NWV's decoder is unable to decode K1JT's without AP it
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attempts to decode messages of the type [IV3NWV ? ?] and [IV3NWV ?].
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Step 3) K1JT's decoder attempts to decode [? ? ?] and [K1JT IV3NWV ?]
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(this last decode type has been enabled by K1JT's encoder at step 2)
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Step 4) IV3NWV's decoder attempts to decode [? ? ?] and [IV3NWV K1JT
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?] (this last decode type has been enabled by IV3NWV's encoder at step
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3)
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At each step the simulation reports if a decode was successful. In
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this case it also reports the type of decode (see table decode_type
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above)
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When mode=QRA_NOAP, only [? ? ?] decodes are attempted and no a-priori
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information is used by the decoder
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The function returns 0 if all of the four messages have been decoded
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by their recipients (with no retries) and -1 if any of them could not
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be decoded
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*/
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int x[QRA64_K], xdec[QRA64_K];
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int y[QRA64_N];
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float *rx;
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int rc;
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// Each simulated station must use its own codec since it might work with
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// different a-priori information.
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qra64codec *codec_iv3nwv = qra64_init(mode); // codec for IV3NWV
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qra64codec *codec_k1jt = qra64_init(mode); // codec for K1JT
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// Step 1a: IV3NWV makes a CQ call (with no grid)
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printf("IV3NWV tx: CQ IV3NWV\n");
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encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_BLANK);
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qra64_encode(codec_iv3nwv, y, x);
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rx = mfskchannel(y,channel_type,EbNodB);
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// Step 1b: K1JT attempts to decode [? ? ?], [CQ/QRZ ? ?] or [CQ/QRZ ?]
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rc = qra64_decode(codec_k1jt, 0, xdec,rx);
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if (rc>=0) { // decoded
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printf("K1JT rx: received with apcode=%d %s\n",rc, decode_type[rc]);
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// Step 2a: K1JT replies to IV3NWV (with no grid)
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printf("K1JT tx: IV3NWV K1JT\n");
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encodemsg_jt65(x,CALL_IV3NWV,CALL_K1JT, GRID_BLANK);
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qra64_encode(codec_k1jt, y, x);
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rx = mfskchannel(y,channel_type,EbNodB);
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// Step 2b: IV3NWV attempts to decode [? ? ?], [IV3NWV ? ?] or [IV3NWV ?]
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rc = qra64_decode(codec_iv3nwv, 0, xdec,rx);
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if (rc>=0) { // decoded
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printf("IV3NWV rx: received with apcode=%d %s\n",rc, decode_type[rc]);
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// Step 3a: IV3NWV replies to K1JT with a 73
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printf("IV3NWV tx: K1JT IV3NWV 73\n");
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encodemsg_jt65(x,CALL_K1JT,CALL_IV3NWV, GRID_73);
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qra64_encode(codec_iv3nwv, y, x);
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rx = mfskchannel(y,channel_type,EbNodB);
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// Step 3b: K1JT attempts to decode [? ? ?] or [K1JT IV3NWV ?]
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rc = qra64_decode(codec_k1jt, 0, xdec,rx);
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if (rc>=0) { // decoded
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printf("K1JT rx: received with apcode=%d %s\n",rc, decode_type[rc]);
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// Step 4a: K1JT replies to IV3NWV with a 73
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printf("K1JT tx: IV3NWV K1JT 73\n");
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encodemsg_jt65(x,CALL_IV3NWV,CALL_K1JT, GRID_73);
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qra64_encode(codec_k1jt, y, x);
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rx = mfskchannel(y,channel_type,EbNodB);
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// Step 4b: IV3NWV attempts to decode [? ? ?], [IV3NWV ? ?], or [IV3NWV ?]
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rc = qra64_decode(codec_iv3nwv, 0, xdec,rx);
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if (rc>=0) { // decoded
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printf("IV3NWV rx: received with apcode=%d %s\n",rc, decode_type[rc]);
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return 0;
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}
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}
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}
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}
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printf("no decode\n");
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return -1;
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}
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int test_proc_2(int channel_type, float EbNodB, int mode)
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{
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/*
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Here we simulate the decoder of K1JT after K1JT has sent a msg [IV3NWV K1JT]
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and IV3NWV sends him the msg [K1JT IV3NWV JN66].
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If mode=QRA_NOAP, K1JT decoder attempts to decode only msgs of type [? ? ?].
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If mode=QRA_AUTOP, K1JT decoder will attempt to decode also the msgs
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[K1JT IV3NWV] and [K1JT IV3NWV ?].
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In the case a decode is successful the return code of the qra64_decode function
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indicates the amount of a-priori information required to decode the received
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message according to this table:
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rc=0 [? ? ?] AP0
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rc=1 [CQ ? ?] AP27
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rc=2 [CQ ? ] AP42
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rc=3 [CALL ? ?] AP29
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rc=4 [CALL ? ] AP44
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rc=5 [CALL CALL ?] AP57
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rc=6 [? CALL ?] AP29
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rc=7 [? CALL ] AP44
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rc=8 [CALL CALL GRID] AP72
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rc=9 [CQ CALL ?] AP55
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rc=10 [CQ CALL ] AP70
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rc=11 [CQ CALL GRID] AP70
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The return code is <0 when decoding is unsuccessful
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This test simulates the situation ntx times and reports how many times
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a particular type decode among the above 6 cases succeded.
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*/
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int x[QRA64_K], xdec[QRA64_K];
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int y[QRA64_N];
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float *rx;
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float ebnodbest, ebnodbavg=0;
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int rc,k;
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int ndecok[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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int nundet = 0;
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int ntx = 100,ndec=0;
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qra64codec *codec_iv3nwv = qra64_init(mode); // codec for IV3NWV
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qra64codec *codec_k1jt = qra64_init(mode); // codec for K1JT
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printf("\nQRA64 Test #2 - Decoding with AP knowledge (SNR-Eb/No offset = %.1f dB)\n\n",
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QRA64_SNR_EBNO_OFFSET);
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// This will enable K1JT's decoder to look for calls directed to him [K1JT ? ?/b]
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printf("K1JT decoder enabled for [K1JT ? ?/blank]\n");
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qra64_apset(codec_k1jt, CALL_K1JT,0,0,APTYPE_MYCALL);
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// This will enable K1JT's decoder to look for IV3NWV calls directed to him [K1JT IV3NWV ?/b]
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printf("K1JT decoder enabled for [K1JT IV3NWV ?]\n");
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qra64_apset(codec_k1jt, CALL_K1JT,CALL_IV3NWV,0,APTYPE_BOTHCALLS);
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// This will enable K1JT's decoder to look for msges sent by IV3NWV [? IV3NWV ?]
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printf("K1JT decoder enabled for [? IV3NWV ?/blank]\n");
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qra64_apset(codec_k1jt, 0,CALL_IV3NWV,GRID_BLANK,APTYPE_HISCALL);
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// This will enable K1JT's decoder to look for full-knowledge [K1JT IV3NWV JN66] msgs
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printf("K1JT decoder enabled for [K1JT IV3NWV JN66]\n");
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qra64_apset(codec_k1jt, CALL_K1JT,CALL_IV3NWV,GRID_JN66,APTYPE_FULL);
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// This will enable K1JT's decoder to look for calls from IV3NWV [CQ IV3NWV ?/b] msgs
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printf("K1JT decoder enabled for [CQ IV3NWV ?/b/JN66]\n");
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qra64_apset(codec_k1jt, 0,CALL_IV3NWV,GRID_JN66,APTYPE_CQHISCALL);
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// Dx station IV3NWV calls
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printf("\nIV3NWV encoder sends msg: [CQ IV3NWV JN66]\n\n");
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encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_JN66);
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// printf("\nIV3NWV encoder sends msg: [CQ IV3NWV]\n\n");
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// encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_BLANK);
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qra64_encode(codec_iv3nwv, y, x);
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printf("Simulating K1JT decoder up to AP72\n");
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for (k=0;k<ntx;k++) {
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printf(".");
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rx = mfskchannel(y,channel_type,EbNodB);
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rc = qra64_decode(codec_k1jt, &ebnodbest, xdec,rx);
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if (rc>=0) {
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ebnodbavg +=ebnodbest;
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if (memcmp(xdec,x,12*sizeof(int))==0)
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ndecok[rc]++;
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else
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nundet++;
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}
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}
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printf("\n\n");
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printf("Transimtted msgs:%d\nDecoded msgs:\n\n",ntx);
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for (k=0;k<12;k++) {
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printf("%3d with %s\n",ndecok[k],decode_type[k]);
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ndec += ndecok[k];
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}
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printf("\nTotal: %d/%d (%d undetected errors)\n\n",ndec,ntx,nundet);
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printf("");
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ebnodbavg/=(ndec+nundet);
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printf("Estimated SNR (average in dB) = %.2f dB\n\n",ebnodbavg-QRA64_SNR_EBNO_OFFSET);
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return 0;
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}
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void syntax(void)
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{
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printf("\nQRA64 Mode Tests\n");
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printf("2016, Nico Palermo - IV3NWV\n\n");
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printf("---------------------------\n\n");
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printf("Syntax: qra64 [-s<snrdb>] [-c<channel>] [-a<ap-type>] [-t<testtype>] [-h]\n");
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printf("Options: \n");
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printf(" -s<snrdb> : set simulation SNR in 2500 Hz BW (default:-27.5 dB)\n");
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printf(" -c<channel> : set channel type 0=AWGN (default) 1=Rayleigh\n");
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printf(" -a<ap-type> : set decode type 0=NOAP 1=AUTOAP (default) 2=USERAP\n");
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printf(" -t<testtype>: 0=simulate seq of msgs between IV3NWV and K1JT (default)\n");
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printf(" 1=simulate K1JT receiving K1JT IV3NWV JN66\n");
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printf(" -h: this help\n");
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}
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int main(int argc, char* argv[])
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{
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int k, rc, nok=0;
|
|
float SNRdB = -27.5f;
|
|
unsigned int channel = CHANNEL_AWGN;
|
|
unsigned int mode = QRA_AUTOAP;
|
|
unsigned int testtype=0;
|
|
int nqso = 100;
|
|
float EbNodB;
|
|
|
|
// Parse the command line
|
|
while(--argc) {
|
|
argv++;
|
|
if (strncmp(*argv,"-h",2)==0) {
|
|
syntax();
|
|
return 0;
|
|
} else {
|
|
if (strncmp(*argv,"-a",2)==0) {
|
|
mode = ( int)atoi((*argv)+2);
|
|
if (mode>2) {
|
|
printf("Invalid decoding mode\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (strncmp(*argv,"-s",2)==0) {
|
|
SNRdB = (float)atof((*argv)+2);
|
|
if (SNRdB>20 || SNRdB<-40) {
|
|
printf("SNR should be in the range [-40..20]\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (strncmp(*argv,"-t",2)==0) {
|
|
testtype = ( int)atoi((*argv)+2);
|
|
if (testtype>1) {
|
|
printf("Invalid test type\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (strncmp(*argv,"-c",2)==0) {
|
|
channel = ( int)atoi((*argv)+2);
|
|
if (channel>CHANNEL_RAYLEIGH) {
|
|
printf("Invalid channel type\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
} else {
|
|
printf("Invalid option\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
EbNodB = SNRdB+QRA64_SNR_EBNO_OFFSET;
|
|
|
|
#if defined(__linux__) || defined(__unix__)
|
|
srand48(GetTickCount());
|
|
#endif
|
|
|
|
if (testtype==0) {
|
|
for (k=0;k<nqso;k++) {
|
|
printf("\n\n------------------------\n");
|
|
rc = test_proc_1(channel, EbNodB, mode);
|
|
if (rc==0)
|
|
nok++;
|
|
}
|
|
printf("\n\n%d/%d QSOs to end without repetitions\n",nok,nqso);
|
|
} else {
|
|
test_proc_2(channel, EbNodB, mode);
|
|
}
|
|
|
|
printf("Input SNR = %.1fdB channel=%s ap-mode=%s\n\n",
|
|
SNRdB,
|
|
channel==CHANNEL_AWGN?"AWGN":"RAYLEIGH",
|
|
apmode_type[mode]
|
|
);
|
|
return 0;
|
|
}
|