mirror of https://github.com/PentHertz/srsLTE.git
Fixed soft demodulator
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feafec2725
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2574de4d2d
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@ -413,51 +413,66 @@ void demod_64qam_lte_b(const cf_t *symbols, int8_t *llr, int nsymbols)
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void demod_256qam_lte(const cf_t* symbols, float* llr, int nsymbols)
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{
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for (int i = 0; i < nsymbols; i++) {
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float real = crealf(symbols[i]);
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float imag = cimagf(symbols[i]);
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llr[8 * i + 0] = -real;
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llr[8 * i + 1] = -imag;
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llr[8 * i + 2] = fabsf(real) - 8 / sqrt(170);
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llr[8 * i + 3] = fabsf(imag) - 8 / sqrt(170);
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llr[8 * i + 4] = fabsf(llr[8 * i + 2]) - 4 / sqrt(170);
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llr[8 * i + 5] = fabsf(llr[8 * i + 3]) - 4 / sqrt(170);
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llr[8 * i + 6] = fabsf(llr[8 * i + 4]) - 2 / sqrt(170);
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llr[8 * i + 7] = fabsf(llr[8 * i + 5]) - 2 / sqrt(170);
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float real = -__real__ symbols[i];
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float imag = -__imag__ symbols[i];
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*(llr++) = real;
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*(llr++) = imag;
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real = fabsf(real) - 8.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 8.0f / sqrtf(170.0f);
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*(llr++) = real;
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*(llr++) = imag;
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real = fabsf(real) - 4.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 4.0f / sqrtf(170.0f);
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*(llr++) = real;
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*(llr++) = imag;
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real = fabsf(real) - 2.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 2.0f / sqrtf(170.0f);
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*(llr++) = real;
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*(llr++) = imag;
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}
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}
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void demod_256qam_lte_b(const cf_t* symbols, int8_t* llr, int nsymbols)
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{
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for (int i = 0; i < nsymbols; i++) {
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float real = SCALE_BYTE_CONV_QAM256 * crealf(symbols[i]);
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float imag = SCALE_BYTE_CONV_QAM256 * cimagf(symbols[i]);
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llr[8 * i + 0] = -real;
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llr[8 * i + 1] = -imag;
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llr[8 * i + 2] = fabsf(real) - SCALE_BYTE_CONV_QAM256 * 8 / sqrt(170);
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llr[8 * i + 3] = fabsf(imag) - SCALE_BYTE_CONV_QAM256 * 8 / sqrt(170);
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llr[8 * i + 4] = fabsf(llr[8 * i + 2]) - SCALE_BYTE_CONV_QAM256 * 4 / sqrt(170);
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llr[8 * i + 5] = fabsf(llr[8 * i + 3]) - SCALE_BYTE_CONV_QAM256 * 4 / sqrt(170);
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llr[8 * i + 6] = fabsf(llr[8 * i + 4]) - SCALE_BYTE_CONV_QAM256 * 2 / sqrt(170);
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llr[8 * i + 7] = fabsf(llr[8 * i + 5]) - SCALE_BYTE_CONV_QAM256 * 2 / sqrt(170);
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float real = -__real__ symbols[i];
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float imag = -__imag__ symbols[i];
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*(llr++) = SCALE_BYTE_CONV_QAM256 * real;
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*(llr++) = SCALE_BYTE_CONV_QAM256 * imag;
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real = fabsf(real) - 8.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 8.0f / sqrtf(170.0f);
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*(llr++) = SCALE_BYTE_CONV_QAM256 * real;
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*(llr++) = SCALE_BYTE_CONV_QAM256 * imag;
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real = fabsf(real) - 4.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 4.0f / sqrtf(170.0f);
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*(llr++) = SCALE_BYTE_CONV_QAM256 * real;
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*(llr++) = SCALE_BYTE_CONV_QAM256 * imag;
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real = fabsf(real) - 2.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 2.0f / sqrtf(170.0f);
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*(llr++) = SCALE_BYTE_CONV_QAM256 * real;
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*(llr++) = SCALE_BYTE_CONV_QAM256 * imag;
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}
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}
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void demod_256qam_lte_s(const cf_t* symbols, short* llr, int nsymbols)
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{
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for (int i = 0; i < nsymbols; i++) {
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float real = SCALE_SHORT_CONV_QAM256 * crealf(symbols[i]);
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float imag = SCALE_SHORT_CONV_QAM256 * cimagf(symbols[i]);
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llr[8 * i + 0] = -real;
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llr[8 * i + 1] = -imag;
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llr[8 * i + 2] = fabsf(real) - SCALE_SHORT_CONV_QAM256 * 8 / sqrt(170);
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llr[8 * i + 3] = fabsf(imag) - SCALE_SHORT_CONV_QAM256 * 8 / sqrt(170);
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llr[8 * i + 4] = fabsf(llr[8 * i + 2]) - SCALE_SHORT_CONV_QAM256 * 4 / sqrt(170);
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llr[8 * i + 5] = fabsf(llr[8 * i + 3]) - SCALE_SHORT_CONV_QAM256 * 4 / sqrt(170);
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llr[8 * i + 6] = fabsf(llr[8 * i + 4]) - SCALE_SHORT_CONV_QAM256 * 2 / sqrt(170);
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llr[8 * i + 7] = fabsf(llr[8 * i + 5]) - SCALE_SHORT_CONV_QAM256 * 2 / sqrt(170);
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float real = -__real__ symbols[i];
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float imag = -__imag__ symbols[i];
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*(llr++) = SCALE_SHORT_CONV_QAM256 * real;
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*(llr++) = SCALE_SHORT_CONV_QAM256 * imag;
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real = fabsf(real) - 8.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 8.0f / sqrtf(170.0f);
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*(llr++) = SCALE_SHORT_CONV_QAM256 * real;
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*(llr++) = SCALE_SHORT_CONV_QAM256 * imag;
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real = fabsf(real) - 4.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 4.0f / sqrtf(170.0f);
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*(llr++) = SCALE_SHORT_CONV_QAM256 * real;
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*(llr++) = SCALE_SHORT_CONV_QAM256 * imag;
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real = fabsf(real) - 2.0f / sqrtf(170.0f);
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imag = fabsf(imag) - 2.0f / sqrtf(170.0f);
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*(llr++) = SCALE_SHORT_CONV_QAM256 * real;
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*(llr++) = SCALE_SHORT_CONV_QAM256 * imag;
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}
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}
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@ -82,11 +82,12 @@ void parse_args(int argc, char **argv) {
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int main(int argc, char **argv) {
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int ret = SRSLTE_SUCCESS;
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int i;
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srslte_modem_table_t mod;
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uint8_t *input, *input_bytes, *output;
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cf_t *symbols, *symbols_bytes;
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float *llr, *llr2;
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float* llr;
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parse_args(argc, argv);
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@ -137,12 +138,6 @@ int main(int argc, char **argv) {
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exit(-1);
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}
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llr2 = srslte_vec_malloc(sizeof(float) * num_bits);
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if (!llr2) {
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perror("malloc");
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exit(-1);
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}
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/* generate random data */
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for (i=0;i<num_bits;i++) {
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input[i] = rand()%2;
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@ -177,26 +172,27 @@ int main(int argc, char **argv) {
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exit(-1);
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}
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}
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bzero(llr, sizeof(float) * num_bits / mod.nbits_x_symbol);
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printf("Symbols OK\n");
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/* demodulate */
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gettimeofday(&x, NULL);
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srslte_demod_soft_demodulate(modulation, symbols, llr, num_bits / mod.nbits_x_symbol);
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gettimeofday(&y, NULL);
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printf("\nElapsed time [us]: %ld\n", y.tv_usec - x.tv_usec);
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for (i=0;i<num_bits;i++) {
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output[i] = llr[i]>=0 ? 1 : 0;
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}
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/* check errors */
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for (i=0;i<num_bits;i++) {
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for (i = 0; i < num_bits && ret == SRSLTE_SUCCESS; i++) {
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if (input[i] != output[i]) {
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ERROR("Error in bit %d\n", i);
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exit(-1);
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ret = SRSLTE_ERROR;
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}
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}
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free(llr2);
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free(llr);
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free(symbols);
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free(symbols_bytes);
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@ -206,6 +202,5 @@ int main(int argc, char **argv) {
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srslte_modem_table_free(&mod);
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printf("Ok\n");
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exit(0);
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exit(ret);
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}
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