// static callback function
static int callback(unsigned char * _header,
int _header_valid,
unsigned char * _payload,
unsigned int _payload_len,
int _payload_valid,
framesyncstats_s _stats,
void * _userdata)
{
printf("*** callback invoked ***\n");
printf(" error vector mag. : %12.8f dB\n", _stats.evm);
printf(" rssi : %12.8f dB\n", _stats.rssi);
printf(" carrier offset : %12.8f\n", _stats.cfo);
printf(" mod. scheme : %s\n", modulation_types[_stats.mod_scheme].fullname);
printf(" mod. depth : %u\n", _stats.mod_bps);
printf(" payload CRC : %s\n", crc_scheme_str[_stats.check][1]);
printf(" payload fec (inner) : %s\n", fec_scheme_str[_stats.fec0][1]);
printf(" payload fec (outer) : %s\n", fec_scheme_str[_stats.fec1][1]);
printf(" header crc : %s\n", _header_valid ? "pass" : "FAIL");
printf(" header data : %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n",
_header[0], _header[1], _header[2], _header[3],
_header[4], _header[5], _header[6], _header[7]);
printf(" num header errors : %u / %u\n",
count_bit_errors_array(_header, header, 8),
8*8);
printf(" payload crc : %s\n", _payload_valid ? "pass" : "FAIL");
printf(" num payload errors : %u / %u\n",
count_bit_errors_array(_payload, payload, 64),
64*8);
return 0;
}
int main(int argc, char*argv[])
{
// Table G.18: coded bits of first DATA symbol
unsigned char * msg_org = annexg_G18;
// Table G.21: interleaved bits of first DATA symbol
unsigned char * msg_test = annexg_G21;
// options...
unsigned int ncbps = 192; // number of coded bits per OFDM symbol
//unsigned int nbpsc = 4; // number of bits per subcarrier (modulation depth)
unsigned int rate = WLANFRAME_RATE_36;
unsigned int n = ncbps / 8;
unsigned int i;
//
// interleave message
//
unsigned char msg_enc[n];
wlan_interleaver_encode_symbol(rate, msg_org, msg_enc);
// print results
printf("interleaved:\n");
for (i=0; i<n; i++)
printf("%3u : 0x%.2x > 0x%.2x (0x%.2x) %s\n", i, msg_org[i], msg_enc[i], msg_test[i], msg_enc[i] == msg_test[i] ? "" : "*");
printf("errors : %3u / %3u\n", count_bit_errors_array(msg_enc, msg_test, n), ncbps);
if (count_bit_errors_array(msg_enc, msg_test, n) > 0) {
fprintf(stderr,"fail: %s, encoding failure\n", __FILE__);
exit(1);
}
//
// de-interleave message
//
unsigned char msg_dec[n];
wlan_interleaver_decode_symbol(rate, msg_enc, msg_dec);
// print results
printf("de-interleaved:\n");
for (i=0; i<n; i++)
printf("%3u : 0x%.2x > 0x%.2x (0x%.2x) %s\n", i, msg_enc[i], msg_dec[i], msg_org[i], msg_dec[i] == msg_org[i] ? "" : "*");
printf("errors : %3u / %3u\n", count_bit_errors_array(msg_dec, msg_org, n), ncbps);
if (count_bit_errors_array(msg_dec, msg_org, n) > 0) {
fprintf(stderr,"fail: %s, decoding failure\n", __FILE__);
exit(1);
}
return 0;
}
// callback function
int callback(unsigned char * _header,
int _header_valid,
unsigned char * _payload,
unsigned int _payload_len,
int _payload_valid,
framesyncstats_s _stats,
void * _userdata)
{
printf("**** callback invoked : rssi = %8.3f dB, evm = %8.3f dB, cfo = %8.5f\n", _stats.rssi, _stats.evm, _stats.cfo);
unsigned int i;
// print header data to standard output
printf(" header rx :");
for (i=0; i<8; i++)
printf(" %.2X", _header[i]);
printf("\n");
// print payload data to standard output
printf(" payload rx :");
for (i=0; i<_payload_len; i++) {
printf(" %.2X", _payload[i]);
if ( ((i+1)%26)==0 && i !=_payload_len-1 )
printf("\n ");
}
printf("\n");
// count errors in received payload and print to standard output
unsigned char * payload_tx = (unsigned char*) _userdata;
unsigned int num_errors = count_bit_errors_array(_payload, payload_tx, _payload_len);
printf(" bit errors : %u / %u\n", num_errors, 8*_payload_len);
return 0;
}
static int callback(unsigned char * _payload,
struct wlan_rxvector_s _rxvector,
void * _userdata)
{
printf("**** callback invoked\n");
struct wlanframesync_autotest_s * testdata = (struct wlanframesync_autotest_s*) _userdata;
// count errors
unsigned int num_bit_errors = count_bit_errors_array(_payload, testdata->msg_org, _rxvector.LENGTH);
printf("bit errors : %4u / %4u\n", num_bit_errors, 8*_rxvector.LENGTH);
// increment number of frames decoded
testdata->num_frames++;
// check results
if (num_bit_errors != 0) {
fprintf(stderr,"wlanframesync_autotest: errors detected!\n");
testdata->valid = 0;
} else if (testdata->length != _rxvector.LENGTH) {
fprintf(stderr,"wlanframesync_autotest: length mismatch\n");
testdata->valid = 0;
} else if (testdata->datarate != _rxvector.DATARATE) {
fprintf(stderr,"wlanframesync_autotest: rate mismatch\n");
testdata->valid = 0;
} else if (testdata->num_frames != 1) {
fprintf(stderr,"wlanframesync_autotest: frame number mismatch\n");
testdata->valid = 0;
}
return 0;
}
static int callback(int _header_valid,
unsigned char * _payload,
struct wlan_rxvector_s _rxvector,
void * _userdata)
{
printf("**** callback invoked (header: %s)\n", _header_valid ? "valid" : "INVALID");
if (!_header_valid)
return 1;
// type cast 'userdata' as original data vector
unsigned char * msg_org = (unsigned char*) _userdata;
// count errors
unsigned int num_bit_errors = count_bit_errors_array(_payload, msg_org, _rxvector.LENGTH);
printf("bit errors : %4u / %4u\n", num_bit_errors, 8*_rxvector.LENGTH);
return 0;
}
int main(int argc, char*argv[])
{
unsigned int i;
// error vector [72 x 1]
unsigned char e[9] = {0,0,0,0,0,0,0,0,2};
// original message [64 x 1]
unsigned char m[8] = {0,0,0,0,0,0,0,1};
// derived values
unsigned char v[9]; // encoded/transmitted message
unsigned char r[9]; // received vector
unsigned char s; // syndrome vector
unsigned char v_hat[9]; // estimated transmitted message
unsigned char m_hat[8]; // estimated original message
// original message
printf("m (original message):\n ");
print_bitstring(m,64);
// compute encoded/transmitted message: v = m*G
v[0] = 0;
for (i=0; i<8; i++) {
v[0] <<= 1;
unsigned int p = liquid_c_ones[ P[8*i+0] & m[0] ] +
liquid_c_ones[ P[8*i+1] & m[1] ] +
liquid_c_ones[ P[8*i+2] & m[2] ] +
liquid_c_ones[ P[8*i+3] & m[3] ] +
liquid_c_ones[ P[8*i+4] & m[4] ] +
liquid_c_ones[ P[8*i+5] & m[5] ] +
liquid_c_ones[ P[8*i+6] & m[6] ] +
liquid_c_ones[ P[8*i+7] & m[7] ];
//printf("p = %u\n", p);
v[0] |= p & 0x01;
}
for (i=0; i<8; i++)
v[i+1] = m[i];
printf("v (encoded/transmitted message):\n");
print_bitstring(v,72);
// use pre-determined error vector
printf("e (error vector):\n");
print_bitstring(e,72);
// compute received vector: r = v + e
for (i=0; i<9; i++)
r[i] = v[i] ^ e[i];
printf("r (received vector):\n");
print_bitstring(r,72);
// compute syndrome vector, s = r*H^T = ( H*r^T )^T
s = 0;
for (i=0; i<8; i++) {
s <<= 1;
unsigned int p =
( (r[0] & (1<<(8-i-1))) ? 1 : 0 )+
liquid_c_ones[ P[8*i+0] & r[1] ] +
liquid_c_ones[ P[8*i+1] & r[2] ] +
liquid_c_ones[ P[8*i+2] & r[3] ] +
liquid_c_ones[ P[8*i+3] & r[4] ] +
liquid_c_ones[ P[8*i+4] & r[5] ] +
liquid_c_ones[ P[8*i+5] & r[6] ] +
liquid_c_ones[ P[8*i+6] & r[7] ] +
liquid_c_ones[ P[8*i+7] & r[8] ];
printf("p = %u\n", p);
s |= p & 0x01;
}
printf("s (syndrome vector):\n");
print_bitstring(&s,8);
// compute weight of s
unsigned int ws = liquid_count_ones(s);
printf("w(s) = %u\n", ws);
// estimated error vector
unsigned char e_hat[9] = {0,0,0,0,0,0,0,0,0};
if (ws == 0) {
printf("no errors detected\n");
} else {
// estimate error location
int syndrome_match = 0;
// TODO : these can be pre-computed
unsigned int n;
for (n=0; n<72; n++) {
// compute syndrome
unsigned char e_test[9] = {0,0,0,0,0,0,0,0,0};
unsigned char s_hat = 0;
div_t d = div(n,8);
e_test[9-d.quot-1] = 1 << d.rem;
for (i=0; i<8; i++) {
s_hat <<= 1;
unsigned int p =
( (e_test[0] & (1<<(8-i-1))) ? 1 : 0 )+
liquid_c_ones[ P[8*i+0] & e_test[1] ] +
liquid_c_ones[ P[8*i+1] & e_test[2] ] +
liquid_c_ones[ P[8*i+2] & e_test[3] ] +
liquid_c_ones[ P[8*i+3] & e_test[4] ] +
liquid_c_ones[ P[8*i+4] & e_test[5] ] +
liquid_c_ones[ P[8*i+5] & e_test[6] ] +
liquid_c_ones[ P[8*i+6] & e_test[7] ] +
liquid_c_ones[ P[8*i+7] & e_test[8] ];
s_hat |= p & 0x01;
}
// print results
//printf("e_test:"); print_bitstring(e_test, 72);
printf("%2u e=", n);
for (i=0; i<9; i++) {
print_bitstring_short(e_test[i],8);
printf(" ");
}
printf("s=");
print_bitstring_short(s_hat,8);
if (s == s_hat) printf("*");
printf("\n");
if (s == s_hat) {
memmove(e_hat, e_test, 9*sizeof(unsigned char));
syndrome_match = 1;
}
}
if (syndrome_match) {
printf("syndrome match!\n");
} else {
printf("no syndrome match; expected multiple errors\n");
}
}
// compute estimated transmitted message: v_hat = r + e_hat
printf("e-hat (estimated error vector):\n");
print_bitstring(e_hat,72);
printf("v-hat (estimated transmitted vector):\n");
for (i=0; i<9; i++)
v_hat[i] = r[i] ^ e_hat[i];
print_bitstring(v_hat,72);
//print_bitstring(v, 72);
// compute errors between v, v_hat
unsigned int num_errors_encoded = count_bit_errors_array(v, v_hat, 9);
printf("decoding errors (encoded) : %2u / 72\n", num_errors_encoded);
// compute estimated original message: (last 64 bits of encoded message)
for (i=0; i<9; i++)
m_hat[i] = v_hat[i+1];
printf("m-hat (estimated original vector):\n ");
print_bitstring(m_hat,64);
//print_bitstring(m, 64);
// compute errors between m, m_hat
unsigned int num_errors_decoded = count_bit_errors_array(m, m_hat, 8);
printf("decoding errors (original) : %2u / 64\n", num_errors_decoded);
return 0;
}
int main(int argc, char*argv[])
{
unsigned int i;
// error vector [22 x 1]
unsigned char err[5] = {0,0,0,0,2};
// original message [16 x 1]
unsigned char m[4] = {0,0,0,1};
//m[0] = rand() & 0xffff;
//m[1] = rand() & 0xffff;
// derived values
unsigned char v[5]; // encoded/transmitted message
unsigned char e[5]; // error vector
unsigned char r[5]; // received vector
unsigned char s; // syndrome vector
unsigned char e_hat[5] = {0,0,0,0,0}; // estimated error vector
unsigned char v_hat[5]; // estimated transmitted message
unsigned char m_hat[4]; // estimated original message
#if 0
// print P matrix
printf("P : \n");
print_bitstring(&P[ 0],32);
print_bitstring(&P[ 4],32);
print_bitstring(&P[ 8],32);
print_bitstring(&P[12],32);
print_bitstring(&P[16],32);
print_bitstring(&P[20],32);
print_bitstring(&P[24],32);
#endif
// original message
printf("m (original message): ");
print_bitstring(m,32);
// compute encoded/transmitted message: v = m*G
v[0] = 0;
for (i=0; i<7; i++) {
v[0] <<= 1;
unsigned int p = liquid_c_ones[P[4*i+0] & m[0]] +
liquid_c_ones[P[4*i+1] & m[1]] +
liquid_c_ones[P[4*i+2] & m[2]] +
liquid_c_ones[P[4*i+3] & m[3]];
//printf("p = %u\n", p);
v[0] |= p & 0x01;
}
v[1] = m[0];
v[2] = m[1];
v[3] = m[2];
v[4] = m[3];
printf("v (encoded message): ");
print_bitstring(v,39);
// use pre-determined error vector
e[0] = err[0];
e[1] = err[1];
e[2] = err[2];
e[3] = err[3];
e[4] = err[4];
printf("e (error vector): ");
print_bitstring(e,39);
// compute received vector: r = v + e
r[0] = v[0] ^ e[0];
r[1] = v[1] ^ e[1];
r[2] = v[2] ^ e[2];
r[3] = v[3] ^ e[3];
r[4] = v[4] ^ e[4];
printf("r (received vector): ");
print_bitstring(r,39);
// compute syndrome vector, s = r*H^T = ( H*r^T )^T
s = 0;
for (i=0; i<7; i++) {
s <<= 1;
unsigned int p =
( (r[0] & (1<<(7-i-1))) ? 1 : 0 )+
liquid_count_ones(P[4*i+0] & r[1]) +
liquid_count_ones(P[4*i+1] & r[2]) +
liquid_count_ones(P[4*i+2] & r[3]) +
liquid_count_ones(P[4*i+3] & r[4]);
//printf("p = %u\n", p);
s |= p & 0x01;
}
printf("s (syndrome vector): ");
print_bitstring(&s,7);
// compute weight of s
unsigned int ws = liquid_count_ones(s);
printf("weight(s) = %u\n", ws);
if (ws == 0) {
printf("no errors detected\n");
} else {
// estimate error location
int syndrome_match = 0;
// TODO : these can be pre-computed
unsigned int n;
for (n=0; n<39; n++) {
// compute syndrome
unsigned int s_test = 0;
unsigned char e_test[5] = {0,0,0,0,0};
div_t d = div(n,8);
e_test[5-d.quot-1] = 1 << d.rem;
for (i=0; i<7; i++) {
s_test <<= 1;
unsigned int p =
( (e_test[0] & (1<<(7-i-1))) ? 1 : 0 )+
liquid_count_ones(P[4*i+0] & e_test[1]) +
liquid_count_ones(P[4*i+1] & e_test[2]) +
liquid_count_ones(P[4*i+2] & e_test[3]) +
liquid_count_ones(P[4*i+3] & e_test[4]);
s_test |= p & 0x01;
}
#if 1
// print results
//printf("e_test:"); print_bitstring(e_test, 72);
printf("%3u : e = ", n);
print_bitstring_short(e_test[0],7); printf(" ");
print_bitstring_short(e_test[1],8); printf(" ");
print_bitstring_short(e_test[2],8); printf(" ");
print_bitstring_short(e_test[3],8); printf(" ");
print_bitstring_short(e_test[4],8); printf(" ");
printf(", s = ");
print_bitstring_short(s_test,7);
if (s == s_test) printf(" *");
printf("\n");
#else
// print output array (secded2216_syndrome_w1[])
printf("0x%.2x\n", s_test);
#endif
if (s == s_test) {
memmove(e_hat, e_test, sizeof(e_test));
syndrome_match = 1;
}
}
if (syndrome_match) {
printf("syndrome match!\n");
} else {
printf("no syndrome match; expected multiple errors\n");
}
}
// compute estimated transmitted message: v_hat = r + e_hat
printf("e-hat (estimated error):");
print_bitstring(e_hat,39);
printf("v-hat (estimated tx): ");
v_hat[0] = r[0] ^ e_hat[0];
v_hat[1] = r[1] ^ e_hat[1];
v_hat[2] = r[2] ^ e_hat[2];
v_hat[3] = r[3] ^ e_hat[3];
v_hat[4] = r[4] ^ e_hat[4];
print_bitstring(v_hat,39);
// compute estimated original message: (last 16 bits of encoded message)
m_hat[0] = v_hat[1];
m_hat[1] = v_hat[2];
m_hat[2] = v_hat[3];
m_hat[3] = v_hat[4];
printf("m-hat (estimated orig.):");
print_bitstring(m_hat,32);
// compute errors between v, v_hat
unsigned int num_errors_encoded = count_bit_errors_array(v, v_hat, 5);
printf("decoding errors (encoded) : %2u / 39\n", num_errors_encoded);
// compute errors between m, m_hat
unsigned int num_errors_decoded = count_bit_errors_array(m, m_hat, 4);
printf("decoding errors (original) : %2u / 32\n", num_errors_decoded);
return 0;
}
