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adapt utils

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This commit is contained in:
Bastian Bloessl
2013-12-31 12:53:52 +01:00
parent 2609e45494
commit 797ecad685
2 changed files with 10 additions and 124 deletions
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lib/utils.cc
+10 -117
View File
@@ -21,32 +21,15 @@
#include <math.h> #include <math.h>
// constellations for different modulations (normalized to avg power 1) // constellations for different modulations (normalized to avg power 1)
const std::complex<float> BPSK[2] = {
std::complex<float>(-1.0, 0.0), std::complex<float>(1.0, 0.0)};
const std::complex<double> BPSK_D[2] = { const std::complex<double> BPSK_D[2] = {
std::complex<double>(-1.0, 0.0), std::complex<double>(1.0, 0.0)}; std::complex<double>(-1.0, 0.0), std::complex<double>(1.0, 0.0)};
const std::complex<float> QPSK[4] = {
std::complex<float>(-0.7071, -0.7071), std::complex<float>(-0.7071, 0.7071),
std::complex<float>(+0.7071, -0.7071), std::complex<float>(+0.7071, 0.7071)};
const std::complex<double> QPSK_D[4] = { const std::complex<double> QPSK_D[4] = {
std::complex<double>(-0.7071, -0.7071), std::complex<double>(-0.7071, 0.7071), std::complex<double>(-0.7071, -0.7071), std::complex<double>(-0.7071, 0.7071),
std::complex<double>(+0.7071, -0.7071), std::complex<double>(+0.7071, 0.7071)}; std::complex<double>(+0.7071, -0.7071), std::complex<double>(+0.7071, 0.7071)};
const std::complex<float> QAM16[16] = {
std::complex<float>(-0.9487, -0.9487), std::complex<float>(-0.9487, -0.3162),
std::complex<float>(-0.9487, 0.9487), std::complex<float>(-0.9487, 0.3162),
std::complex<float>(-0.3162, -0.9487), std::complex<float>(-0.3162, -0.3162),
std::complex<float>(-0.3162, 0.9487), std::complex<float>(-0.3162, 0.3162),
std::complex<float>(0.9487, -0.9487), std::complex<float>(0.9487, -0.3162),
std::complex<float>(0.9487, 0.9487), std::complex<float>(0.9487, 0.3162),
std::complex<float>(0.3162, -0.9487), std::complex<float>(0.3162, -0.3162),
std::complex<float>(0.3162, 0.9487), std::complex<float>(0.3162, 0.3162)};
const std::complex<double> QAM16_D[16] = { const std::complex<double> QAM16_D[16] = {
std::complex<double>(-0.9487, -0.9487), std::complex<double>(-0.9487, -0.3162), std::complex<double>(-0.9487, -0.9487), std::complex<double>(-0.9487, -0.3162),
std::complex<double>(-0.9487, 0.9487), std::complex<double>(-0.9487, 0.3162), std::complex<double>(-0.9487, 0.9487), std::complex<double>(-0.9487, 0.3162),
@@ -58,40 +41,6 @@ const std::complex<double> QAM16_D[16] = {
std::complex<double>(0.3162, 0.9487), std::complex<double>(0.3162, 0.3162)}; std::complex<double>(0.3162, 0.9487), std::complex<double>(0.3162, 0.3162)};
const std::complex<float> QAM64[64] = {
std::complex<float>(-1.0801, -1.0801), std::complex<float>(-1.0801, -0.7715),
std::complex<float>(-1.0801, -0.1543), std::complex<float>(-1.0801, -0.4629),
std::complex<float>(-1.0801, 1.0801), std::complex<float>(-1.0801, 0.7715),
std::complex<float>(-1.0801, 0.1543), std::complex<float>(-1.0801, 0.4629),
std::complex<float>(-0.7715, -1.0801), std::complex<float>(-0.7715, -0.7715),
std::complex<float>(-0.7715, -0.1543), std::complex<float>(-0.7715, -0.4629),
std::complex<float>(-0.7715, 1.0801), std::complex<float>(-0.7715, 0.7715),
std::complex<float>(-0.7715, 0.1543), std::complex<float>(-0.7715, 0.4629),
std::complex<float>(-0.1543, -1.0801), std::complex<float>(-0.1543, -0.7715),
std::complex<float>(-0.1543, -0.1543), std::complex<float>(-0.1543, -0.4629),
std::complex<float>(-0.1543, 1.0801), std::complex<float>(-0.1543, 0.7715),
std::complex<float>(-0.1543, 0.1543), std::complex<float>(-0.1543, 0.4629),
std::complex<float>(-0.4629, -1.0801), std::complex<float>(-0.4629, -0.7715),
std::complex<float>(-0.4629, -0.1543), std::complex<float>(-0.4629, -0.4629),
std::complex<float>(-0.4629, 1.0801), std::complex<float>(-0.4629, 0.7715),
std::complex<float>(-0.4629, 0.1543), std::complex<float>(-0.4629, 0.4629),
std::complex<float>(1.0801, -1.0801), std::complex<float>(1.0801, -0.7715),
std::complex<float>(1.0801, -0.1543), std::complex<float>(1.0801, -0.4629),
std::complex<float>(1.0801, 1.0801), std::complex<float>(1.0801, 0.7715),
std::complex<float>(1.0801, 0.1543), std::complex<float>(1.0801, 0.4629),
std::complex<float>(0.7715, -1.0801), std::complex<float>(0.7715, -0.7715),
std::complex<float>(0.7715, -0.1543), std::complex<float>(0.7715, -0.4629),
std::complex<float>(0.7715, 1.0801), std::complex<float>(0.7715, 0.7715),
std::complex<float>(0.7715, 0.1543), std::complex<float>(0.7715, 0.4629),
std::complex<float>(0.1543, -1.0801), std::complex<float>(0.1543, -0.7715),
std::complex<float>(0.1543, -0.1543), std::complex<float>(0.1543, -0.4629),
std::complex<float>(0.1543, 1.0801), std::complex<float>(0.1543, 0.7715),
std::complex<float>(0.1543, 0.1543), std::complex<float>(0.1543, 0.4629),
std::complex<float>(0.4629, -1.0801), std::complex<float>(0.4629, -0.7715),
std::complex<float>(0.4629, -0.1543), std::complex<float>(0.4629, -0.4629),
std::complex<float>(0.4629, 1.0801), std::complex<float>(0.4629, 0.7715),
std::complex<float>(0.4629, 0.1543), std::complex<float>(0.4629, 0.4629)};
const std::complex<double> QAM64_D[64] = { const std::complex<double> QAM64_D[64] = {
std::complex<double>(-1.0801, -1.0801), std::complex<double>(-1.0801, -0.7715), std::complex<double>(-1.0801, -1.0801), std::complex<double>(-1.0801, -0.7715),
std::complex<double>(-1.0801, -0.1543), std::complex<double>(-1.0801, -0.4629), std::complex<double>(-1.0801, -0.1543), std::complex<double>(-1.0801, -0.4629),
@@ -192,6 +141,7 @@ ofdm_param::ofdm_param(Encoding e) {
} }
} }
void void
ofdm_param::print() { ofdm_param::print() {
std::cout << "OFDM Parameters:" << std::endl; std::cout << "OFDM Parameters:" << std::endl;
@@ -202,6 +152,7 @@ ofdm_param::print() {
std::cout << "n_dbps :" << n_dbps << std::endl; std::cout << "n_dbps :" << n_dbps << std::endl;
} }
tx_param::tx_param(ofdm_param &ofdm, int psdu_length) { tx_param::tx_param(ofdm_param &ofdm, int psdu_length) {
psdu_size = psdu_length; psdu_size = psdu_length;
@@ -226,9 +177,6 @@ tx_param::print() {
std::cout << "n_pad: " << n_pad << std::endl; std::cout << "n_pad: " << n_pad << std::endl;
} }
int get_bit(int b, int i) {
return (b & (1 << i) ? 1 : 0);
}
void scramble(const char *in, char *out, tx_param &tx, char initial_state) { void scramble(const char *in, char *out, tx_param &tx, char initial_state) {
@@ -243,10 +191,12 @@ void scramble(const char *in, char *out, tx_param &tx, char initial_state) {
} }
} }
void reset_tail_bits(char *scrambled_data, tx_param &tx) { void reset_tail_bits(char *scrambled_data, tx_param &tx) {
memset(scrambled_data + tx.n_data - tx.n_pad - 6, 0, 6 * sizeof(char)); memset(scrambled_data + tx.n_data - tx.n_pad - 6, 0, 6 * sizeof(char));
} }
int ones(int n) { int ones(int n) {
int sum = 0; int sum = 0;
for(int i = 0; i < 8; i++) { for(int i = 0; i < 8; i++) {
@@ -257,6 +207,7 @@ int ones(int n) {
return sum; return sum;
} }
void convolutional_encoding(const char *in, char *out, tx_param &tx) { void convolutional_encoding(const char *in, char *out, tx_param &tx) {
int state = 0; int state = 0;
@@ -269,6 +220,7 @@ void convolutional_encoding(const char *in, char *out, tx_param &tx) {
} }
} }
void puncturing(const char *in, char *out, tx_param &tx, ofdm_param &ofdm) { void puncturing(const char *in, char *out, tx_param &tx, ofdm_param &ofdm) {
int mod; int mod;
@@ -306,6 +258,7 @@ void puncturing(const char *in, char *out, tx_param &tx, ofdm_param &ofdm) {
} }
} }
void interleave(const char *in, char *out, tx_param &tx, ofdm_param &ofdm, bool reverse) { void interleave(const char *in, char *out, tx_param &tx, ofdm_param &ofdm, bool reverse) {
int n_cbps = ofdm.n_cbps; int n_cbps = ofdm.n_cbps;
@@ -332,6 +285,7 @@ void interleave(const char *in, char *out, tx_param &tx, ofdm_param &ofdm, bool
} }
} }
void interleave(const double *in, double *out, tx_param &tx, ofdm_param &ofdm, bool reverse) { void interleave(const double *in, double *out, tx_param &tx, ofdm_param &ofdm, bool reverse) {
int n_cbps = ofdm.n_cbps; int n_cbps = ofdm.n_cbps;
@@ -357,6 +311,8 @@ void interleave(const double *in, double *out, tx_param &tx, ofdm_param &ofdm, b
} }
} }
} }
void split_symbols(const char *in, char *out, tx_param &tx, ofdm_param &ofdm) { void split_symbols(const char *in, char *out, tx_param &tx, ofdm_param &ofdm) {
int symbols = tx.n_sym * 48; int symbols = tx.n_sym * 48;
@@ -372,69 +328,6 @@ void split_symbols(const char *in, char *out, tx_param &tx, ofdm_param &ofdm) {
} }
void generate_signal_field(char *out, tx_param &tx, ofdm_param &ofdm) {
//data bits of the signal header
char *signal_header = (char *) malloc(sizeof(char) * 24);
//signal header after...
//convolutional encoding
char *encoded_signal_header = (char *) malloc(sizeof(char) * 48);
//interleaving
char *interleaved_signal_header = (char *) malloc(sizeof(char) * 48);
int length = tx.psdu_size;
// first 4 bits represent the modulation and coding scheme
signal_header[ 0] = get_bit(ofdm.rate_field, 3);
signal_header[ 1] = get_bit(ofdm.rate_field, 2);
signal_header[ 2] = get_bit(ofdm.rate_field, 1);
signal_header[ 3] = get_bit(ofdm.rate_field, 0);
// 5th bit is reserved and must be set to 0
signal_header[ 4] = 0;
// then 12 bits represent the length
signal_header[ 5] = get_bit(length, 0);
signal_header[ 6] = get_bit(length, 1);
signal_header[ 7] = get_bit(length, 2);
signal_header[ 8] = get_bit(length, 3);
signal_header[ 9] = get_bit(length, 4);
signal_header[10] = get_bit(length, 5);
signal_header[11] = get_bit(length, 6);
signal_header[12] = get_bit(length, 7);
signal_header[13] = get_bit(length, 8);
signal_header[14] = get_bit(length, 9);
signal_header[15] = get_bit(length, 10);
signal_header[16] = get_bit(length, 11);
//18-th bit is the parity bit for the first 17 bits
int sum = 0;
for(int i = 0; i < 17; i++) {
if(signal_header[i]) {
sum++;
}
}
signal_header[17] = sum % 2;
// last 6 bits must be set to 0
for (int i = 0; i < 6; i++) {
signal_header[18 + i] = 0;
}
ofdm_param signal_ofdm(BPSK_1_2);
tx_param signal_tx(signal_ofdm, 3);
signal_tx.n_data = 24;
signal_tx.n_sym = 1;
// convolutional encoding (scrambling is not needed)
convolutional_encoding(signal_header, encoded_signal_header, signal_tx);
// interleaving
//interleave(encoded_signal_header, interleaved_signal_header, signal_tx, signal_ofdm);
interleave(encoded_signal_header, out, signal_tx, signal_ofdm);
free(signal_header);
free(encoded_signal_header);
free(interleaved_signal_header);
}
void generate_bits(const char *psdu, char *data_bits, tx_param &tx) { void generate_bits(const char *psdu, char *data_bits, tx_param &tx) {
// first 16 bits are zero (SERVICE/DATA field) // first 16 bits are zero (SERVICE/DATA field)
lib/utils.h
-7
View File
@@ -31,11 +31,6 @@
#define mylog(msg) do { d_log && std::cout << msg << std::endl; } while(0); #define mylog(msg) do { d_log && std::cout << msg << std::endl; } while(0);
#endif #endif
extern const std::complex<float> BPSK[2];
extern const std::complex<float> QPSK[4];
extern const std::complex<float> QAM16[16];
extern const std::complex<float> QAM64[64];
// same mappings in double (itpp sucks) // same mappings in double (itpp sucks)
extern const std::complex<double> BPSK_D[2]; extern const std::complex<double> BPSK_D[2];
extern const std::complex<double> QPSK_D[4]; extern const std::complex<double> QPSK_D[4];
@@ -120,8 +115,6 @@ void interleave(const double *input, double *out, tx_param &tx, ofdm_param &ofdm
void split_symbols(const char *input, char *out, tx_param &tx, ofdm_param &ofdm); void split_symbols(const char *input, char *out, tx_param &tx, ofdm_param &ofdm);
void generate_signal_field(char *out, tx_param &tx, ofdm_param &ofdm);
void generate_bits(const char *psdu, char *data_bits, tx_param &tx); void generate_bits(const char *psdu, char *data_bits, tx_param &tx);
#endif /* INCLUDED_IEEE802_11_OFDM_UTILS_H */ #endif /* INCLUDED_IEEE802_11_OFDM_UTILS_H */