int main(int argc, char*argv[])
{
srand(time(NULL));
// data options
struct wlan_txvector_s txvector;
txvector.LENGTH = 100;
txvector.DATARATE = WLANFRAME_RATE_36;
txvector.SERVICE = 0;
txvector.TXPWR_LEVEL = 0;
// debug options
int debug_enabled = 0;
// channel options
float noise_floor = -20.0f; // noise floor [dB]
float SNRdB = 20.0f; // signal-to-noise ratio [dB]
float phi = 0.0f; // carrier phase offset
float dphi = 0.0f; // carrier frequency offset
// get options
int dopt;
while((dopt = getopt(argc,argv,"hds:F:n:r:")) != EOF){
switch (dopt) {
case 'h': usage(); return 0;
case 'd': debug_enabled = 1; break;
case 's': SNRdB = atof(optarg); break;
case 'F': dphi = atof(optarg); break;
case 'n': txvector.LENGTH = atoi(optarg); break;
case 'r':
switch ( atoi(optarg) ) {
case 6: txvector.DATARATE = WLANFRAME_RATE_6; break;
case 9: txvector.DATARATE = WLANFRAME_RATE_9; break;
case 12: txvector.DATARATE = WLANFRAME_RATE_12; break;
case 18: txvector.DATARATE = WLANFRAME_RATE_18; break;
case 24: txvector.DATARATE = WLANFRAME_RATE_24; break;
case 36: txvector.DATARATE = WLANFRAME_RATE_36; break;
case 48: txvector.DATARATE = WLANFRAME_RATE_48; break;
case 54: txvector.DATARATE = WLANFRAME_RATE_54; break;
default:
fprintf(stderr,"error: %s, invalid rate '%s'\n", argv[0], optarg);
exit(1);
}
break;
default:
exit(1);
}
}
// validate input
if (txvector.LENGTH == 0 || txvector.LENGTH > 4095) {
fprintf(stderr,"error: %s, input vector length must be in [0,4095]\n", argv[0]);
exit(1);
}
unsigned int i;
// initialize original data message
unsigned char msg_org[txvector.LENGTH];
for (i=0; i<txvector.LENGTH; i++)
msg_org[i] = rand() & 0xff;
float nstd = powf(10.0f, noise_floor/20.0f);
float gamma = powf(10.0f, (SNRdB + noise_floor)/20.0f);
// arrays
float complex buffer[80]; // data buffer
// create frame generator
wlanframegen fg = wlanframegen_create();
// create frame synchronizer
wlanframesync fs = wlanframesync_create(callback, (void*)msg_org);
if (debug_enabled)
wlanframesync_debug_enable(fs);
//wlanframesync_print(fs);
// assemble frame and print
wlanframegen_assemble(fg, msg_org, txvector);
wlanframegen_print(fg);
// open output file
FILE * fid = fopen(OUTPUT_FILENAME,"w");
if (!fid) {
fprintf(stderr,"error: %s, could not open '%s' for writing\n", argv[0], OUTPUT_FILENAME);
exit(1);
}
fprintf(fid,"%% %s : auto-generated file\n\n", OUTPUT_FILENAME);
fprintf(fid,"clear all;\n");
fprintf(fid,"close all;\n\n");
fprintf(fid,"x = [];\n");
unsigned int n = 0;
// push noise through synchronizer
unsigned int d = 32*64 + 2;
for (i=0; i<d; i++) {
buffer[0] = nstd*( randnf() + _Complex_I*randnf() )*M_SQRT1_2;
wlanframesync_execute(fs, buffer, 1);
}
// generate/synchronize frame
int last_frame = 0;
while (!last_frame) {
// write symbol
last_frame = wlanframegen_writesymbol(fg, buffer);
// push through channel (add noise, carrier offset)
for (i=0; i<80; i++) {
buffer[i] *= cexpf(_Complex_I*(phi + dphi*n));
buffer[i] *= gamma;
buffer[i] += nstd*( randnf() + _Complex_I*randnf() )*M_SQRT1_2;
// write buffer to file
fprintf(fid,"x(%4u) = %12.4e + j*%12.4e;\n", n+1, crealf(buffer[i]), cimagf(buffer[i]));
n++;
}
// run through synchronize
wlanframesync_execute(fs, buffer, 80);
}
// plot results
fprintf(fid,"\n");
fprintf(fid,"figure;\n");
fprintf(fid,"t = 0:(length(x)-1);\n");
fprintf(fid,"plot(t,real(x), t,imag(x));\n");
fclose(fid);
printf("results written to '%s'\n", OUTPUT_FILENAME);
// write debug output if enabled
if (debug_enabled)
wlanframesync_debug_print(fs, "wlanframesync_debug.m");
// destroy objects
wlanframegen_destroy(fg);
wlanframesync_destroy(fs);
printf("done.\n");
return 0;
}
int wlanframesync_runtest(unsigned int _rate)
{
srand(time(NULL));
// data options
unsigned char * msg_org = annexg_G1;
struct wlan_txvector_s txvector;
txvector.LENGTH = 100;
txvector.DATARATE = _rate;
txvector.SERVICE = 0;
txvector.TXPWR_LEVEL = 0;
#if 0
// channel options
float noise_floor = -120.0f; // noise floor [dB]
float SNRdB = 20.0f; // signal-to-noise ratio [dB]
float phi = 0.0f; // carrier phase offset
float dphi = 0.0f; // carrier frequency offset
float nstd = powf(10.0f, noise_floor/20.0f);
float gamma = powf(10.0f, (SNRdB + noise_floor)/20.0f);
#endif
// arrays
float complex buffer[80]; // data buffer
// create frame generator
wlanframegen fg = wlanframegen_create();
// initialize test data object
struct wlanframesync_autotest_s testdata;
testdata.msg_org = msg_org;
testdata.length = txvector.LENGTH;
testdata.datarate = txvector.DATARATE;
testdata.num_frames = 0;
testdata.valid = 1;
// create frame synchronizer
wlanframesync fs = wlanframesync_create(callback, (void*)&testdata);
//wlanframesync_print(fs);
// assemble frame and print
wlanframegen_assemble(fg, msg_org, txvector);
wlanframegen_print(fg);
#if 0
// push noise through synchronizer
unsigned int d = 32*64 + 2;
for (i=0; i<d; i++) {
buffer[0] = nstd*( randnf() + _Complex_I*randnf() )*M_SQRT1_2;
wlanframesync_execute(fs, buffer, 1);
}
#endif
// generate/synchronize frame
int last_frame = 0;
while (!last_frame) {
// write symbol
last_frame = wlanframegen_writesymbol(fg, buffer);
#if 0
// push through channel (add noise, carrier offset)
for (i=0; i<80; i++) {
buffer[i] *= cexpf(_Complex_I*(phi + dphi*n));
buffer[i] *= gamma;
buffer[i] += nstd*( randnf() + _Complex_I*randnf() )*M_SQRT1_2;
n++;
}
#endif
// run through synchronize
wlanframesync_execute(fs, buffer, 80);
}
// destroy objects
wlanframegen_destroy(fg);
wlanframesync_destroy(fs);
// check results
if (testdata.num_frames == 0) {
fprintf(stderr,"wlanframesync_autotest: no frames detected!\n");
testdata.valid = 0;
}
if (!testdata.valid) {
fprintf(stderr,"fail: %s, synchronization failure (rate = %u)\n", __FILE__, _rate);
exit(1);
}
return 0;
}