mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-03 07:51:16 -05:00
4838d97370
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7340 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
747 lines
22 KiB
C
747 lines
22 KiB
C
/*
|
|
main.c
|
|
QRA64 mode encode/decode tests
|
|
|
|
(c) 2016 - Nico Palermo, IV3NWV
|
|
|
|
Thanks to Andrea Montefusco IW0HDV for his help on adapting the sources
|
|
to OSs other than MS Windows
|
|
|
|
------------------------------------------------------------------------------
|
|
This file is part of the qracodes project, a Forward Error Control
|
|
encoding/decoding package based on Q-ary RA (Repeat and Accumulate) LDPC codes.
|
|
|
|
Files in this package:
|
|
main.c - this file
|
|
qra64.c/.h - qra64 mode encode/decoding functions
|
|
|
|
../qracodes/normrnd.{c,h} - random gaussian number generator
|
|
../qracodes/npfwht.{c,h} - Fast Walsh-Hadamard Transforms
|
|
../qracodes/pdmath.{c,h} - Elementary math on probability distributions
|
|
../qracodes/qra12_63_64_irr_b.{c,h} - Tables for a QRA(12,63) irregular RA
|
|
code over GF(64)
|
|
../qracodes/qra13_64_64_irr_e.{c,h} - Tables for a QRA(13,64) irregular RA
|
|
code over GF(64)
|
|
../qracodes/qracodes.{c,h} - QRA codes encoding/decoding functions
|
|
|
|
-------------------------------------------------------------------------------
|
|
|
|
qracodes 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.
|
|
qracodes 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 qracodes source distribution.
|
|
If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
-----------------------------------------------------------------------------
|
|
|
|
The code used by the QRA64 mode is the code: QRA13_64_64_IRR_E: K=13
|
|
N=64 Q=64 irregular QRA code (defined in qra13_64_64_irr_e.{h,c}).
|
|
|
|
This code has been designed to include a CRC as the 13th information
|
|
symbol and improve the code UER (Undetected Error Rate). The CRC
|
|
symbol is not sent along the channel (the codes are punctured) and the
|
|
resulting code is still a (12,63) code with an effective code rate of
|
|
R = 12/63.
|
|
*/
|
|
|
|
// OS dependent defines and includes ------------------------------------------
|
|
|
|
#if _WIN32 // note the underscore: without it, it's not msdn official!
|
|
// Windows (x64 and x86)
|
|
#include <windows.h> // required only for GetTickCount(...)
|
|
#include <process.h> // _beginthread
|
|
#endif
|
|
|
|
#if __linux__
|
|
#include <unistd.h>
|
|
#include <time.h>
|
|
|
|
unsigned GetTickCount(void) {
|
|
struct timespec ts;
|
|
unsigned theTick = 0U;
|
|
clock_gettime( CLOCK_REALTIME, &ts );
|
|
theTick = ts.tv_nsec / 1000000;
|
|
theTick += ts.tv_sec * 1000;
|
|
return theTick;
|
|
}
|
|
#endif
|
|
|
|
#if __APPLE__
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "qra64.h"
|
|
#include "../qracodes/normrnd.h" // gaussian numbers generator
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// channel types
|
|
#define CHANNEL_AWGN 0
|
|
#define CHANNEL_RAYLEIGH 1
|
|
#define CHANNEL_FASTFADE 2
|
|
|
|
#define JT65_SNR_EBNO_OFFSET 29.1f // with the synch used in JT65
|
|
#define QRA64_SNR_EBNO_OFFSET 31.0f // with the costas array synch
|
|
|
|
void printwordd(char *msg, int *x, int size)
|
|
{
|
|
int k;
|
|
printf("\n%s ",msg);
|
|
for (k=0;k<size;k++)
|
|
printf("%2d ",x[k]);
|
|
printf("\n");
|
|
}
|
|
void printwordh(char *msg, int *x, int size)
|
|
{
|
|
int k;
|
|
printf("\n%s ",msg);
|
|
for (k=0;k<size;k++)
|
|
printf("%02hx ",x[k]);
|
|
printf("\n");
|
|
}
|
|
|
|
#define NSAMPLES (QRA64_N*QRA64_M)
|
|
|
|
static float rp[NSAMPLES];
|
|
static float rq[NSAMPLES];
|
|
static float chp[NSAMPLES];
|
|
static float chq[NSAMPLES];
|
|
static float r[NSAMPLES];
|
|
|
|
float *mfskchannel(int *x, int channel_type, float EbNodB)
|
|
{
|
|
/*
|
|
Simulate an MFSK channel, either AWGN or Rayleigh.
|
|
|
|
x is a pointer to the transmitted codeword, an array of QRA64_N
|
|
integers in the range 0..63.
|
|
|
|
Returns the received symbol energies (squared amplitudes) as an array of
|
|
(QRA64_M*QRA64_N) floats. The first QRA64_M entries of this array are
|
|
the energies of the first symbol in the codeword. The second QRA64_M
|
|
entries are those of the second symbol, and so on up to the last codeword
|
|
symbol.
|
|
*/
|
|
const float No = 1.0f; // noise spectral density
|
|
const float sigma = (float)sqrt(No/2.0f); // std dev of noise I/Q components
|
|
const float sigmach = (float)sqrt(1/2.0f); // std dev of channel I/Q gains
|
|
const float R = 1.0f*QRA64_K/QRA64_N;
|
|
|
|
float EbNo = (float)pow(10,EbNodB/10);
|
|
float EsNo = 1.0f*QRA64_m*R*EbNo;
|
|
float Es = EsNo*No;
|
|
float A = (float)sqrt(Es);
|
|
int k;
|
|
|
|
normrnd_s(rp,NSAMPLES,0,sigma);
|
|
normrnd_s(rq,NSAMPLES,0,sigma);
|
|
|
|
if(EbNodB>-15)
|
|
if (channel_type == CHANNEL_AWGN)
|
|
for (k=0;k<QRA64_N;k++)
|
|
rp[k*QRA64_M+x[k]]+=A;
|
|
else
|
|
if (channel_type == CHANNEL_RAYLEIGH) {
|
|
normrnd_s(chp,QRA64_N,0,sigmach);
|
|
normrnd_s(chq,QRA64_N,0,sigmach);
|
|
for (k=0;k<QRA64_N;k++) {
|
|
rp[k*QRA64_M+x[k]]+=A*chp[k];
|
|
rq[k*QRA64_M+x[k]]+=A*chq[k];
|
|
}
|
|
}
|
|
else {
|
|
return 0; // unknown channel type
|
|
}
|
|
|
|
// compute the squares of the amplitudes of the received samples
|
|
for (k=0;k<NSAMPLES;k++)
|
|
r[k] = rp[k]*rp[k] + rq[k]*rq[k];
|
|
|
|
return r;
|
|
}
|
|
|
|
// These defines are some packed fields as computed by JT65
|
|
#define CALL_IV3NWV 0x7F85AE7
|
|
#define CALL_K1JT 0xF70DDD7
|
|
#define GRID_JN66 0x3AE4 // JN66
|
|
#define GRID_73 0x7ED0 // 73
|
|
|
|
char decode_type[12][32] = {
|
|
"[? ? ?] AP0",
|
|
"[CQ ? ?] AP27",
|
|
"[CQ ? ] AP42",
|
|
"[CALL ? ?] AP29",
|
|
"[CALL ? ] AP44",
|
|
"[CALL CALL ?] AP57",
|
|
"[? CALL ?] AP29",
|
|
"[? CALL ] AP44",
|
|
"[CALL CALL G] AP72",
|
|
"[CQ CALL ?] AP55",
|
|
"[CQ CALL ] AP70",
|
|
"[CQ CALL G] AP70"
|
|
};
|
|
char apmode_type[3][32] = {
|
|
"NO AP",
|
|
"AUTO AP",
|
|
"USER AP"
|
|
};
|
|
|
|
int test_proc_1(int channel_type, float EbNodB, int mode)
|
|
{
|
|
/*
|
|
Here we simulate the following (dummy) QSO:
|
|
|
|
1) CQ IV3NWV
|
|
2) IV3NWV K1JT
|
|
3) K1JT IV3NWV 73
|
|
4) IV3NWV K1JT 73
|
|
|
|
No message repetition is attempted
|
|
|
|
The QSO is counted as successfull if IV3NWV received the last message
|
|
When mode=QRA_AUTOAP each decoder attempts to decode the message sent
|
|
by the other station using the a-priori information derived by what
|
|
has been already decoded in a previous phase of the QSO if decoding
|
|
with no a-priori information has not been successful.
|
|
|
|
Step 1) K1JT's decoder first attempts to decode msgs of type [? ? ?]
|
|
and if this attempt fails, it attempts to decode [CQ/QRZ ? ?] or
|
|
[CQ/QRZ ?] msgs
|
|
|
|
Step 2) if IV3NWV's decoder is unable to decode K1JT's without AP it
|
|
attempts to decode messages of the type [IV3NWV ? ?] and [IV3NWV ?].
|
|
|
|
Step 3) K1JT's decoder attempts to decode [? ? ?] and [K1JT IV3NWV ?]
|
|
(this last decode type has been enabled by K1JT's encoder at step 2)
|
|
|
|
Step 4) IV3NWV's decoder attempts to decode [? ? ?] and [IV3NWV K1JT
|
|
?] (this last decode type has been enabled by IV3NWV's encoder at step
|
|
3)
|
|
|
|
At each step the simulation reports if a decode was successful. In
|
|
this case it also reports the type of decode (see table decode_type
|
|
above)
|
|
|
|
When mode=QRA_NOAP, only [? ? ?] decodes are attempted and no a-priori
|
|
information is used by the decoder
|
|
|
|
The function returns 0 if all of the four messages have been decoded
|
|
by their recipients (with no retries) and -1 if any of them could not
|
|
be decoded
|
|
*/
|
|
|
|
int x[QRA64_K], xdec[QRA64_K];
|
|
int y[QRA64_N];
|
|
float *rx;
|
|
int rc;
|
|
|
|
// Each simulated station must use its own codec since it might work with
|
|
// different a-priori information.
|
|
qra64codec *codec_iv3nwv = qra64_init(mode); // codec for IV3NWV
|
|
qra64codec *codec_k1jt = qra64_init(mode); // codec for K1JT
|
|
|
|
// Step 1a: IV3NWV makes a CQ call (with no grid)
|
|
printf("IV3NWV tx: CQ IV3NWV\n");
|
|
encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_BLANK);
|
|
qra64_encode(codec_iv3nwv, y, x);
|
|
rx = mfskchannel(y,channel_type,EbNodB);
|
|
|
|
// Step 1b: K1JT attempts to decode [? ? ?], [CQ/QRZ ? ?] or [CQ/QRZ ?]
|
|
rc = qra64_decode(codec_k1jt, 0, xdec,rx);
|
|
if (rc>=0) { // decoded
|
|
printf("K1JT rx: received with apcode=%d %s\n",rc, decode_type[rc]);
|
|
|
|
// Step 2a: K1JT replies to IV3NWV (with no grid)
|
|
printf("K1JT tx: IV3NWV K1JT\n");
|
|
encodemsg_jt65(x,CALL_IV3NWV,CALL_K1JT, GRID_BLANK);
|
|
qra64_encode(codec_k1jt, y, x);
|
|
rx = mfskchannel(y,channel_type,EbNodB);
|
|
|
|
// Step 2b: IV3NWV attempts to decode [? ? ?], [IV3NWV ? ?] or [IV3NWV ?]
|
|
rc = qra64_decode(codec_iv3nwv, 0, xdec,rx);
|
|
if (rc>=0) { // decoded
|
|
printf("IV3NWV rx: received with apcode=%d %s\n",rc, decode_type[rc]);
|
|
|
|
// Step 3a: IV3NWV replies to K1JT with a 73
|
|
printf("IV3NWV tx: K1JT IV3NWV 73\n");
|
|
encodemsg_jt65(x,CALL_K1JT,CALL_IV3NWV, GRID_73);
|
|
qra64_encode(codec_iv3nwv, y, x);
|
|
rx = mfskchannel(y,channel_type,EbNodB);
|
|
|
|
// Step 3b: K1JT attempts to decode [? ? ?] or [K1JT IV3NWV ?]
|
|
rc = qra64_decode(codec_k1jt, 0, xdec,rx);
|
|
if (rc>=0) { // decoded
|
|
printf("K1JT rx: received with apcode=%d %s\n",rc, decode_type[rc]);
|
|
|
|
// Step 4a: K1JT replies to IV3NWV with a 73
|
|
printf("K1JT tx: IV3NWV K1JT 73\n");
|
|
encodemsg_jt65(x,CALL_IV3NWV,CALL_K1JT, GRID_73);
|
|
qra64_encode(codec_k1jt, y, x);
|
|
rx = mfskchannel(y,channel_type,EbNodB);
|
|
|
|
// Step 4b: IV3NWV attempts to decode [? ? ?], [IV3NWV ? ?], or [IV3NWV ?]
|
|
rc = qra64_decode(codec_iv3nwv, 0, xdec,rx);
|
|
if (rc>=0) { // decoded
|
|
printf("IV3NWV rx: received with apcode=%d %s\n",rc, decode_type[rc]);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
printf("no decode\n");
|
|
return -1;
|
|
}
|
|
|
|
int test_proc_2(int channel_type, float EbNodB, int mode)
|
|
{
|
|
/*
|
|
Here we simulate the decoder of K1JT after K1JT has sent a msg [IV3NWV K1JT]
|
|
and IV3NWV sends him the msg [K1JT IV3NWV JN66].
|
|
|
|
If mode=QRA_NOAP, K1JT decoder attempts to decode only msgs of type [? ? ?].
|
|
|
|
If mode=QRA_AUTOP, K1JT decoder will attempt to decode also the msgs
|
|
[K1JT IV3NWV] and [K1JT IV3NWV ?].
|
|
|
|
In the case a decode is successful the return code of the qra64_decode function
|
|
indicates the amount of a-priori information required to decode the received
|
|
message according to this table:
|
|
|
|
rc=0 [? ? ?] AP0
|
|
rc=1 [CQ ? ?] AP27
|
|
rc=2 [CQ ? ] AP42
|
|
rc=3 [CALL ? ?] AP29
|
|
rc=4 [CALL ? ] AP44
|
|
rc=5 [CALL CALL ?] AP57
|
|
rc=6 [? CALL ?] AP29
|
|
rc=7 [? CALL ] AP44
|
|
rc=8 [CALL CALL GRID] AP72
|
|
rc=9 [CQ CALL ?] AP55
|
|
rc=10 [CQ CALL ] AP70
|
|
rc=11 [CQ CALL GRID] AP70
|
|
|
|
The return code is <0 when decoding is unsuccessful
|
|
|
|
This test simulates the situation ntx times and reports how many times
|
|
a particular type decode among the above 6 cases succeded.
|
|
*/
|
|
|
|
int x[QRA64_K], xdec[QRA64_K];
|
|
int y[QRA64_N];
|
|
float *rx;
|
|
float ebnodbest, ebnodbavg=0;
|
|
int rc,k;
|
|
|
|
int ndecok[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
|
|
int nundet = 0;
|
|
int ntx = 200,ndec=0;
|
|
|
|
qra64codec *codec_iv3nwv = qra64_init(mode); // codec for IV3NWV
|
|
qra64codec *codec_k1jt = qra64_init(mode); // codec for K1JT
|
|
|
|
printf("\nQRA64 Test #2 - Decoding with AP knowledge (SNR-Eb/No offset = %.1f dB)\n\n",
|
|
QRA64_SNR_EBNO_OFFSET);
|
|
|
|
// This will enable K1JT's decoder to look for calls directed to him [K1JT ? ?/b]
|
|
// printf("K1JT decoder enabled for [K1JT ? ?/blank]\n");
|
|
// qra64_apset(codec_k1jt, CALL_K1JT,0,0,APTYPE_MYCALL);
|
|
|
|
// This will enable K1JT's decoder to look for IV3NWV calls directed to him [K1JT IV3NWV ?/b]
|
|
// printf("K1JT decoder enabled for [K1JT IV3NWV ?]\n");
|
|
// qra64_apset(codec_k1jt, CALL_CQ,CALL_IV3NWV,0,APTYPE_BOTHCALLS);
|
|
|
|
// This will enable K1JT's decoder to look for msges sent by IV3NWV [? IV3NWV ?]
|
|
// printf("K1JT decoder enabled for [? IV3NWV ?/blank]\n");
|
|
// qra64_apset(codec_k1jt, 0,CALL_IV3NWV,GRID_BLANK,APTYPE_HISCALL);
|
|
|
|
// This will enable K1JT's decoder to look for full-knowledge [K1JT IV3NWV JN66] msgs
|
|
printf("K1JT decoder enabled for [K1JT IV3NWV JN66]\n");
|
|
qra64_apset(codec_k1jt, CALL_K1JT,CALL_IV3NWV,GRID_JN66,APTYPE_FULL);
|
|
|
|
// This will enable K1JT's decoder to look for calls from IV3NWV [CQ IV3NWV ?/b] msgs
|
|
printf("K1JT decoder enabled for [CQ IV3NWV ?/b/JN66]\n");
|
|
qra64_apset(codec_k1jt, 0,CALL_IV3NWV,GRID_JN66,APTYPE_CQHISCALL);
|
|
|
|
|
|
// Dx station IV3NWV calls
|
|
printf("\nIV3NWV encoder sends msg: [K1JT IV3NWV JN66]\n\n");
|
|
encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_JN66);
|
|
|
|
// printf("\nIV3NWV encoder sends msg: [CQ IV3NWV JN66]\n\n");
|
|
// encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_JN66);
|
|
|
|
// printf("\nIV3NWV encoder sends msg: [CQ IV3NWV]\n\n");
|
|
// encodemsg_jt65(x,CALL_CQ,CALL_IV3NWV,GRID_BLANK);
|
|
qra64_encode(codec_iv3nwv, y, x);
|
|
|
|
printf("Simulating K1JT decoder up to AP72\n");
|
|
|
|
for (k=0;k<ntx;k++) {
|
|
printf(".");
|
|
rx = mfskchannel(y,channel_type,EbNodB);
|
|
rc = qra64_decode(codec_k1jt, &ebnodbest, xdec,rx);
|
|
if (rc>=0) {
|
|
ebnodbavg +=ebnodbest;
|
|
if (memcmp(xdec,x,12*sizeof(int))==0)
|
|
ndecok[rc]++;
|
|
else
|
|
nundet++;
|
|
}
|
|
}
|
|
printf("\n\n");
|
|
|
|
|
|
printf("Transimtted msgs:%d\nDecoded msgs:\n\n",ntx);
|
|
for (k=0;k<12;k++) {
|
|
printf("%3d with %s\n",ndecok[k],decode_type[k]);
|
|
ndec += ndecok[k];
|
|
}
|
|
printf("\nTotal: %d/%d (%d undetected errors)\n\n",ndec,ntx,nundet);
|
|
printf("");
|
|
|
|
ebnodbavg/=(ndec+nundet);
|
|
printf("Estimated SNR (average in dB) = %.2f dB\n\n",ebnodbavg-QRA64_SNR_EBNO_OFFSET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int test_fastfading(float EbNodB, float B90, int fadingModel, int submode, int apmode, int olddec, int channel_type, int ntx)
|
|
{
|
|
int x[QRA64_K], xdec[QRA64_K];
|
|
int y[QRA64_N];
|
|
float *rx;
|
|
float ebnodbest, ebnodbavg=0;
|
|
int rc,k;
|
|
float rxolddec[QRA64_N*QRA64_M]; // holds the energies at nominal tone freqs
|
|
|
|
int ndecok[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
|
|
int nundet = 0;
|
|
int ndec=0;
|
|
|
|
qra64codec *codec_iv3nwv;
|
|
qra64codec *codec_k1jt;
|
|
|
|
codec_iv3nwv=qra64_init(QRA_NOAP);
|
|
codec_k1jt =qra64_init(apmode);
|
|
|
|
if (channel_type==2) { // fast-fading case
|
|
printf("Simulating the fast-fading channel\n");
|
|
printf("B90=%.2f Hz - Fading Model=%s - Submode=QRA64%c\n",B90,fadingModel?"Lorentz":"Gauss",submode+'A');
|
|
printf("Decoder metric = %s\n",olddec?"AWGN":"Matched to fast-fading signal");
|
|
}
|
|
else {
|
|
printf("Simulating the %s channel\n",channel_type?"Rayleigh block fading":"AWGN");
|
|
printf("Decoder metric = AWGN\n");
|
|
}
|
|
|
|
|
|
printf("\nEncoding msg [K1JT IV3NWV JN66]\n");
|
|
encodemsg_jt65(x,CALL_K1JT,CALL_IV3NWV,GRID_JN66);
|
|
// printf("[");
|
|
// for (k=0;k<11;k++) printf("%02hX ",x[k]); printf("%02hX]\n",x[11]);
|
|
|
|
qra64_encode(codec_iv3nwv, y, x);
|
|
printf("%d transmissions will be simulated\n\n",ntx);
|
|
|
|
if (apmode==QRA_USERAP) {
|
|
// This will enable K1JT's decoder to look for cq/qrz calls [CQ/QRZ ? ?/b]
|
|
printf("K1JT decoder enabled for [CQ ? ?/blank]\n");
|
|
qra64_apset(codec_k1jt, CALL_K1JT,0,0,APTYPE_CQQRZ);
|
|
|
|
// This will enable K1JT's decoder to look for calls directed to him [K1JT ? ?/b]
|
|
printf("K1JT decoder enabled for [K1JT ? ?/blank]\n");
|
|
qra64_apset(codec_k1jt, CALL_K1JT,0,0,APTYPE_MYCALL);
|
|
|
|
// This will enable K1JT's decoder to look for msges sent by IV3NWV [? IV3NWV ?]
|
|
printf("K1JT decoder enabled for [? IV3NWV ?/blank]\n");
|
|
qra64_apset(codec_k1jt, 0,CALL_IV3NWV,GRID_BLANK,APTYPE_HISCALL);
|
|
|
|
// This will enable K1JT's decoder to look for IV3NWV calls directed to him [K1JT IV3NWV ?/b]
|
|
printf("K1JT decoder enabled for [K1JT IV3NWV ?]\n");
|
|
qra64_apset(codec_k1jt, CALL_K1JT,CALL_IV3NWV,0,APTYPE_BOTHCALLS);
|
|
|
|
// This will enable K1JT's decoder to look for full-knowledge [K1JT IV3NWV JN66] msgs
|
|
printf("K1JT decoder enabled for [K1JT IV3NWV JN66]\n");
|
|
qra64_apset(codec_k1jt, CALL_K1JT,CALL_IV3NWV,GRID_JN66,APTYPE_FULL);
|
|
|
|
// This will enable K1JT's decoder to look for calls from IV3NWV [CQ IV3NWV ?/b] msgs
|
|
printf("K1JT decoder enabled for [CQ IV3NWV ?/b/JN66]\n");
|
|
qra64_apset(codec_k1jt, 0,CALL_IV3NWV,GRID_JN66,APTYPE_CQHISCALL);
|
|
|
|
}
|
|
|
|
printf("\nNow decoding with K1JT's decoder...\n");
|
|
/*
|
|
if (channel_type==2) // simulate a fast-faded signal
|
|
printf("Simulating a fast-fading channel with given B90 and spread type\n");
|
|
else
|
|
printf("Simulating a %s channel\n",channel_type?"Rayleigh block fading":"AWGN");
|
|
*/
|
|
for (k=0;k<ntx;k++) {
|
|
|
|
if ((k%10)==0)
|
|
printf(" %5.1f %%\r",100.0*k/ntx);
|
|
// printf("."); // work in progress
|
|
|
|
if (channel_type==2) {
|
|
// generate a fast-faded signal
|
|
rc = qra64_fastfading_channel(&rx,y,submode,EbNodB,B90,fadingModel);
|
|
if (rc<0) {
|
|
printf("\nqra64_fastfading_channel error. rc=%d\n",rc);
|
|
return -1;
|
|
}
|
|
}
|
|
else // generate a awgn or Rayleigh block fading signal
|
|
rx = mfskchannel(y, channel_type, EbNodB);
|
|
|
|
|
|
if (channel_type==2) // fast-fading case
|
|
if (olddec==1) {
|
|
int k, j;
|
|
int jj = 1<<submode;
|
|
int bps = QRA64_M*(2+jj);
|
|
float *rxbase;
|
|
float *out = rxolddec;
|
|
// calc energies at nominal freqs
|
|
for (k=0;k<QRA64_N;k++) {
|
|
rxbase = rx + QRA64_M + k*bps;
|
|
for (j=0;j<QRA64_M;j++) {
|
|
*out++=*rxbase;
|
|
rxbase+=jj;
|
|
}
|
|
}
|
|
// decode with awgn decoder
|
|
rc = qra64_decode(codec_k1jt,&ebnodbest,xdec,rxolddec);
|
|
}
|
|
else // use fast-fading decoder
|
|
rc = qra64_decode_fastfading(codec_k1jt,&ebnodbest,xdec,rx,submode,B90,fadingModel);
|
|
else // awgn or rayleigh channel. use the old decoder whatever the olddec option is
|
|
rc = qra64_decode(codec_k1jt,&ebnodbest,xdec,rx);
|
|
|
|
|
|
|
|
if (rc>=0) {
|
|
ebnodbavg +=ebnodbest;
|
|
if (memcmp(xdec,x,12*sizeof(int))==0)
|
|
ndecok[rc]++;
|
|
else {
|
|
fprintf(stderr,"\nUndetected error with rc=%d\n",rc);
|
|
nundet++;
|
|
}
|
|
}
|
|
|
|
}
|
|
printf(" %5.1f %%\r",100.0*k/ntx);
|
|
|
|
printf("\n\n");
|
|
|
|
printf("Msgs transmitted:%d\nMsg decoded:\n\n",ntx);
|
|
for (k=0;k<12;k++) {
|
|
printf("rc=%2d %3d with %s\n",k,ndecok[k],decode_type[k]);
|
|
ndec += ndecok[k];
|
|
}
|
|
printf("\nTotal: %d/%d (%d undetected errors)\n\n",ndec,ntx,nundet);
|
|
printf("");
|
|
|
|
if (ndec>0) {
|
|
ebnodbavg/=(ndec+nundet);
|
|
printf("Estimated SNR (average in dB) = %.2f dB\n\n",ebnodbavg-QRA64_SNR_EBNO_OFFSET);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
void syntax(void)
|
|
{
|
|
|
|
printf("\nQRA64 Mode Tests\n");
|
|
printf("2016, Nico Palermo - IV3NWV\n\n");
|
|
printf("---------------------------\n\n");
|
|
printf("Syntax: qra64 [-s<snrdb>] [-c<channel>] [-a<ap-type>] [-t<testtype>] [-h]\n");
|
|
printf("Options: \n");
|
|
printf(" -s<snrdb> : set simulation SNR in 2500 Hz BW (default:-27.5 dB)\n");
|
|
printf(" -c<channel> : set channel type 0=AWGN (default) 1=Rayleigh 2=Fast-fading\n");
|
|
printf(" -a<ap-type> : set decode type 0=NOAP 1=AUTOAP (default) 2=USERAP\n");
|
|
printf(" -t<testtype>: 0=simulate seq of msgs between IV3NWV and K1JT (default)\n");
|
|
printf(" 1=simulate K1JT receiving K1JT IV3NWV JN66\n");
|
|
printf(" 2=simulate fast-fading/awgn/rayliegh decoders performance\n");
|
|
printf(" -n<ntx> : simulate the transmission of ntx codewords (default=100)\n");
|
|
|
|
printf("Options used only for fast-fading simulations (-c2):\n");
|
|
printf(" -b : 90%% fading bandwidth in Hz [1..230 Hz] (default = 2.5 Hz)\n");
|
|
printf(" -m : fading model. 0=Gauss, 1=Lorentz (default = Lorentz)\n");
|
|
printf(" -q : qra64 submode. 0=QRA64A,... 4=QRA64E (default = QRA64A)\n");
|
|
printf(" -d : use the old awgn decoder\n");
|
|
printf(" -h: this help\n");
|
|
printf("Example:\n");
|
|
printf(" qra64 -t2 -c2 -a2 -b50 -m1 -q2 -n10000 -s-26\n");
|
|
printf(" runs the error performance test (-t2)\n");
|
|
printf(" with USER_AP (-a2)\n");
|
|
printf(" simulating a fast fading channel (-c2)\n");
|
|
printf(" with B90 = 50 Hz (-b50), Lorentz Doppler (-m1), mode QRA64C (-q2)\n");
|
|
printf(" ntx = 10000 codewords (-n10000) and SNR = -26 dB (-s-26)\n");
|
|
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
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;
|
|
float B90 = 2.5;
|
|
int fadingModel = 1;
|
|
int submode = 0;
|
|
int olddec = 0;
|
|
int ntx = 100;
|
|
|
|
// Parse the command line
|
|
while(--argc) {
|
|
argv++;
|
|
|
|
if (strncmp(*argv,"-h",2)==0) {
|
|
syntax();
|
|
return 0;
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-n",2)==0) {
|
|
ntx = ( int)atoi((*argv)+2);
|
|
if (ntx<100 || ntx>1000000) {
|
|
printf("Invalid -n option. ntx must be in the range [100..1000000]\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
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<-50) {
|
|
printf("SNR should be in the range [-50..20]\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-t",2)==0) {
|
|
testtype = ( int)atoi((*argv)+2);
|
|
if (testtype>2) {
|
|
printf("Invalid test type\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-c",2)==0) {
|
|
channel = ( int)atoi((*argv)+2);
|
|
if (channel>CHANNEL_FASTFADE) {
|
|
printf("Invalid channel type\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-b",2)==0) {
|
|
B90 = (float)atof((*argv)+2);
|
|
if (B90<1 || B90>230) {
|
|
printf("Invalid B90\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-m",2)==0) {
|
|
fadingModel = (int)atoi((*argv)+2);
|
|
if (fadingModel<0 || fadingModel>1) {
|
|
printf("Invalid fading model\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-q",2)==0) {
|
|
submode = (int)atoi((*argv)+2);
|
|
if (submode<0 || submode>4) {
|
|
printf("Invalid submode\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
if (strncmp(*argv,"-d",2)==0) {
|
|
olddec = 1;
|
|
}
|
|
else {
|
|
printf("Invalid option\n");
|
|
syntax();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (testtype<2) // old tests
|
|
if (channel==CHANNEL_FASTFADE) {
|
|
printf("Invalid Option. Test type 0 and 1 supports only AWGN or Rayleigh Channel model\n");
|
|
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);
|
|
printf("Input SNR = %.1fdB channel=%s ap-mode=%s\n\n",
|
|
SNRdB,
|
|
channel==CHANNEL_AWGN?"AWGN":"RAYLEIGH",
|
|
apmode_type[mode]
|
|
);
|
|
}
|
|
else if (testtype==1) {
|
|
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]
|
|
);
|
|
}
|
|
else {
|
|
printf("Input SNR = %.1fdB ap-mode=%s\n\n",
|
|
SNRdB,
|
|
apmode_type[mode]
|
|
);
|
|
test_fastfading(EbNodB,B90,fadingModel,submode,mode,olddec, channel, ntx);
|
|
}
|
|
return 0;
|
|
}
|