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/*---------------------------------------------------------------------------*\
FILE........: tcohpsk.c
AUTHOR......: David Rowe
DATE CREATED: March 2015
Tests for the C version of the coherent PSK FDM modem. This program
outputs a file of Octave vectors that are loaded and automatically
tested against the Octave version of the modem by the Octave script
tcohpsk.m
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2015 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. 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 Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "fdmdv_internal.h"
#include "codec2_fdmdv.h"
#include "codec2_cohpsk.h"
#include "cohpsk_defs.h"
#include "cohpsk_internal.h"
#include "octave.h"
#include "comp_prim.h"
#include "noise_samples.h"
#define FRAMES 30 /* LOG_FRAMES is #defined in cohpsk_internal.h */
#define SYNC_FRAMES 12 /* sync state uses up extra log storage as we reprocess several times */
#define FRAMESL (SYNC_FRAMES*FRAMES) /* worst case is every frame is out of sync */
#define FOFF 58.7
#define DFOFF (-0.5/(float)COHPSK_FS)
#define ESNODB 8
#define PPM -1500
extern float pilots_coh[][PILOTS_NC];
int main(int argc, char *argv[])
{
struct COHPSK *coh;
int tx_bits[COHPSK_BITS_PER_FRAME];
COMP tx_symb[NSYMROWPILOT][COHPSK_NC*COHPSK_ND];
COMP tx_fdm_frame[COHPSK_M*NSYMROWPILOT];
COMP ch_fdm_frame[COHPSK_M*NSYMROWPILOT];
//COMP rx_fdm_frame_bb[M*NSYMROWPILOT];
//COMP ch_symb[NSYMROWPILOT][COHPSK_NC*COHPSK_ND];
float rx_bits_sd[COHPSK_BITS_PER_FRAME];
int rx_bits[COHPSK_BITS_PER_FRAME];
int tx_bits_log[COHPSK_BITS_PER_FRAME*FRAMES];
COMP tx_symb_log[NSYMROWPILOT*FRAMES][COHPSK_NC*COHPSK_ND];
COMP tx_fdm_frame_log[COHPSK_M*NSYMROWPILOT*FRAMES];
COMP ch_fdm_frame_log[COHPSK_M*NSYMROWPILOT*FRAMES];
COMP ch_fdm_frame_log_out[(COHPSK_M*NSYMROWPILOT+1)*FRAMES];
//COMP rx_fdm_frame_bb_log[M*NSYMROWPILOT*FRAMES];
//COMP ch_symb_log[NSYMROWPILOT*FRAMES][COHPSK_NC*COHPSK_ND];
COMP ct_symb_ff_log[NSYMROWPILOT*FRAMES][COHPSK_NC*COHPSK_ND];
float rx_amp_log[NSYMROW*FRAMES][COHPSK_NC*COHPSK_ND];
float rx_phi_log[NSYMROW*FRAMES][COHPSK_NC*COHPSK_ND];
COMP rx_symb_log[NSYMROW*FRAMES][COHPSK_NC*COHPSK_ND];
int rx_bits_log[COHPSK_BITS_PER_FRAME*FRAMES];
FILE *fout;
int f, r, c, log_r, log_data_r, noise_r, ff_log_r, i;
double foff;
COMP foff_rect, phase_ch;
struct FDMDV *fdmdv;
//COMP rx_filt[COHPSK_NC*COHPSK_ND][P+1];
//int rx_filt_log_col_index = 0;
//float env[NT*P];
//float __attribute__((unused)) rx_timing;
COMP tx_onesym[COHPSK_NC*COHPSK_ND];
//COMP rx_onesym[COHPSK_NC*COHPSK_ND];
//int rx_baseband_log_col_index = 0;
//COMP rx_baseband_log[COHPSK_NC*COHPSK_ND][(M+M/P)*NSYMROWPILOT*FRAMES];
float f_est_log[FRAMES], sig_rms_log[FRAMES], noise_rms_log[FRAMES];
int f_est_samples;
int log_bits;
float EsNo, variance;
COMP scaled_noise;
int reliable_sync_bit;
int ch_fdm_frame_log_index, nin_frame, tmp, nout;
coh = cohpsk_create();
fdmdv = coh->fdmdv;
assert(coh != NULL);
cohpsk_set_verbose(coh, 1);
/* these puppies are used for logging data in the bowels on the modem */
coh->rx_baseband_log_col_sz = (COHPSK_M+COHPSK_M/P)*NSYMROWPILOT*FRAMESL;
coh->rx_baseband_log = (COMP *)malloc(sizeof(COMP)*COHPSK_NC*COHPSK_ND*coh->rx_baseband_log_col_sz);
coh->rx_filt_log_col_sz = (P+1)*NSYMROWPILOT*FRAMESL;
coh->rx_filt_log = (COMP *)malloc(sizeof(COMP)*COHPSK_NC*COHPSK_ND*coh->rx_filt_log_col_sz);
coh->ch_symb_log_col_sz = COHPSK_NC*COHPSK_ND;
coh->ch_symb_log = (COMP *)malloc(sizeof(COMP)*NSYMROWPILOT*FRAMESL*coh->ch_symb_log_col_sz);
coh->rx_timing_log = (float*)malloc(sizeof(float)*NSYMROWPILOT*FRAMESL);
/* init stuff */
log_r = log_data_r = noise_r = log_bits = ff_log_r = f_est_samples = 0;
phase_ch.real = 1.0; phase_ch.imag = 0.0;
foff = FOFF;
/* each carrier has power = 2, total power 2Nc, total symbol rate
NcRs, noise BW B=Fs Es/No = (C/Rs)/(N/B), N = var =
2NcFs/NcRs(Es/No) = 2Fs/Rs(Es/No) */
EsNo = pow(10.0, ESNODB/10.0);
variance = 2.0*COHPSK_FS/(COHPSK_RS*EsNo);
//fprintf(stderr, "doff: %e\n", DFOFF);
/* Main Loop ---------------------------------------------------------------------*/
for(f=0; f<FRAMES; f++) {
/* --------------------------------------------------------*\
Mod
\*---------------------------------------------------------*/
cohpsk_get_test_bits(coh, tx_bits);
bits_to_qpsk_symbols(tx_symb, (int*)tx_bits, COHPSK_BITS_PER_FRAME);
for(r=0; r<NSYMROWPILOT; r++) {
for(c=0; c<COHPSK_NC*COHPSK_ND; c++)
tx_onesym[c] = tx_symb[r][c];
tx_filter_and_upconvert_coh(&tx_fdm_frame[r*COHPSK_M], COHPSK_NC*COHPSK_ND , tx_onesym, fdmdv->tx_filter_memory,
fdmdv->phase_tx, fdmdv->freq, &fdmdv->fbb_phase_tx, fdmdv->fbb_rect);
}
cohpsk_clip(tx_fdm_frame, COHPSK_CLIP, NSYMROWPILOT*COHPSK_M);
/* --------------------------------------------------------*\
Channel
\*---------------------------------------------------------*/
for(r=0; r<NSYMROWPILOT*COHPSK_M; r++) {
foff_rect.real = cos(2.0*M_PI*foff/COHPSK_FS); foff_rect.imag = sin(2.0*M_PI*foff/COHPSK_FS);
foff += DFOFF;
phase_ch = cmult(phase_ch, foff_rect);
ch_fdm_frame[r] = cmult(tx_fdm_frame[r], phase_ch);
}
phase_ch.real /= cabsolute(phase_ch);
phase_ch.imag /= cabsolute(phase_ch);
//fprintf(stderr, "%f\n", foff);
for(r=0; r<NSYMROWPILOT*COHPSK_M; r++,noise_r++) {
scaled_noise = fcmult(sqrt(variance), noise[noise_r]);
ch_fdm_frame[r] = cadd(ch_fdm_frame[r], scaled_noise);
}
/* optional gain to test level sensitivity */
for(r=0; r<NSYMROWPILOT*COHPSK_M; r++) {
ch_fdm_frame[r] = fcmult(1.0, ch_fdm_frame[r]);
}
/* tx vector logging */
memcpy(&tx_bits_log[COHPSK_BITS_PER_FRAME*f], tx_bits, sizeof(int)*COHPSK_BITS_PER_FRAME);
memcpy(&tx_fdm_frame_log[COHPSK_M*NSYMROWPILOT*f], tx_fdm_frame, sizeof(COMP)*COHPSK_M*NSYMROWPILOT);
memcpy(&ch_fdm_frame_log[COHPSK_M*NSYMROWPILOT*f], ch_fdm_frame, sizeof(COMP)*COHPSK_M*NSYMROWPILOT);
for(r=0; r<NSYMROWPILOT; r++, log_r++) {
for(c=0; c<COHPSK_NC*COHPSK_ND; c++) {
tx_symb_log[log_r][c] = tx_symb[r][c];
}
}
}
/* Fs offset simulation */
nout = cohpsk_fs_offset(ch_fdm_frame_log_out, ch_fdm_frame_log, COHPSK_M*NSYMROWPILOT*FRAMES, PPM);
assert(nout < (COHPSK_M*NSYMROWPILOT+1)*FRAMES);
nin_frame = COHPSK_NOM_SAMPLES_PER_FRAME;
ch_fdm_frame_log_index = 0;
/* --------------------------------------------------------*\
Demod
\*---------------------------------------------------------*/
for(f=0; f<FRAMES; f++) {
coh->frame = f;
//printf("nin_frame: %d\n", nin_frame);
assert(ch_fdm_frame_log_index < COHPSK_M*NSYMROWPILOT*FRAMES);
tmp = nin_frame;
cohpsk_demod(coh, rx_bits_sd, &reliable_sync_bit, &ch_fdm_frame_log_out[ch_fdm_frame_log_index], &nin_frame);
for(i=0; i<COHPSK_BITS_PER_FRAME; i++)
rx_bits[i] = rx_bits_sd[i] < 0.0;
ch_fdm_frame_log_index += tmp;
/* --------------------------------------------------------*\
Log each vector
\*---------------------------------------------------------*/
if (coh->sync == 1) {
for(r=0; r<NSYMROWPILOT; r++, ff_log_r++) {
for(c=0; c<COHPSK_NC*COHPSK_ND; c++) {
ct_symb_ff_log[ff_log_r][c] = coh->ct_symb_ff_buf[r][c];
}
}
for(r=0; r<NSYMROW; r++, log_data_r++) {
for(c=0; c<COHPSK_NC*COHPSK_ND; c++) {
rx_amp_log[log_data_r][c] = coh->amp_[r][c];
rx_phi_log[log_data_r][c] = coh->phi_[r][c];
rx_symb_log[log_data_r][c] = coh->rx_symb[r][c];
}
}
memcpy(&rx_bits_log[COHPSK_BITS_PER_FRAME*log_bits], rx_bits, sizeof(int)*COHPSK_BITS_PER_FRAME);
log_bits++;
f_est_log[f_est_samples] = coh->f_est;
sig_rms_log[f_est_samples] = coh->sig_rms;
noise_rms_log[f_est_samples] = coh->noise_rms;
f_est_samples++;;
}
assert(log_r <= NSYMROWPILOT*FRAMES);
assert(noise_r <= NSYMROWPILOT*COHPSK_M*FRAMES);
assert(log_data_r <= NSYMROW*FRAMES);
printf("\r [%d]", f+1);
}
printf("\n");
/*---------------------------------------------------------*\
Dump logs to Octave file for evaluation
by tcohpsk.m Octave script
\*---------------------------------------------------------*/
fout = fopen("tcohpsk_out.txt","wt");
assert(fout != NULL);
fprintf(fout, "# Created by tcohpsk.c\n");
octave_save_int(fout, "tx_bits_log_c", tx_bits_log, 1, COHPSK_BITS_PER_FRAME*FRAMES);
octave_save_complex(fout, "tx_symb_log_c", (COMP*)tx_symb_log, NSYMROWPILOT*FRAMES, COHPSK_NC*COHPSK_ND, COHPSK_NC*COHPSK_ND);
octave_save_complex(fout, "tx_fdm_frame_log_c", (COMP*)tx_fdm_frame_log, 1, COHPSK_M*NSYMROWPILOT*FRAMES, COHPSK_M*NSYMROWPILOT*FRAMES);
octave_save_complex(fout, "ch_fdm_frame_log_c", (COMP*)ch_fdm_frame_log_out, 1, nout-1, nout-1);
//octave_save_complex(fout, "rx_fdm_frame_bb_log_c", (COMP*)rx_fdm_frame_bb_log, 1, M*NSYMROWPILOT*FRAMES, M*NSYMROWPILOT*FRAMES);
octave_save_complex(fout, "rx_baseband_log_c", (COMP*)coh->rx_baseband_log, COHPSK_NC*COHPSK_ND, coh->rx_baseband_log_col_index, coh->rx_baseband_log_col_sz);
octave_save_complex(fout, "rx_filt_log_c", (COMP*)coh->rx_filt_log, COHPSK_NC*COHPSK_ND, coh->rx_filt_log_col_index, coh->rx_filt_log_col_sz);
octave_save_complex(fout, "ch_symb_log_c", (COMP*)coh->ch_symb_log, coh->ch_symb_log_r, COHPSK_NC*COHPSK_ND, COHPSK_NC*COHPSK_ND);
octave_save_float(fout, "rx_timing_log_c", (float*)coh->rx_timing_log, 1, coh->rx_timing_log_index, coh->rx_timing_log_index);
octave_save_complex(fout, "ct_symb_ff_log_c", (COMP*)ct_symb_ff_log, NSYMROWPILOT*FRAMES, COHPSK_NC*COHPSK_ND, COHPSK_NC*COHPSK_ND);
octave_save_float(fout, "rx_amp_log_c", (float*)rx_amp_log, log_data_r, COHPSK_NC*COHPSK_ND, COHPSK_NC*COHPSK_ND);
octave_save_float(fout, "rx_phi_log_c", (float*)rx_phi_log, log_data_r, COHPSK_NC*COHPSK_ND, COHPSK_NC*COHPSK_ND);
octave_save_complex(fout, "rx_symb_log_c", (COMP*)rx_symb_log, log_data_r, COHPSK_NC*COHPSK_ND, COHPSK_NC*COHPSK_ND);
octave_save_int(fout, "rx_bits_log_c", rx_bits_log, 1, COHPSK_BITS_PER_FRAME*log_bits);
octave_save_float(fout, "f_est_log_c", &f_est_log[1], 1, f_est_samples-1, f_est_samples-1);
octave_save_float(fout, "sig_rms_log_c", sig_rms_log, 1, f_est_samples, f_est_samples-1);
octave_save_float(fout, "noise_rms_log_c", noise_rms_log, 1, f_est_samples, f_est_samples);
#ifdef XX
#endif
fclose(fout);
cohpsk_destroy(coh);
return 0;
}
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