/**@ingroup gen_dft
* \param direction Direction of the dft: 0 computes a dft and 1 computes an idft (default is 0)
* \param mirror 0 computes a normal dft, 1 swaps the two halfes of the input signal before computing
* the dft (used in LTE) (default is 0)
* \param psd Set to 1 to compute the power spectral density (untested) (default is 0)
* \param out_db Set to 1 to produce the output results in dB (untested) (default is 0)
* \param dft_size Number of DFT points. This parameter is mandatory.
*/
int initialize() {
int tmp;
int i;
memset(plans,0,sizeof(dft_plan_t)*NOF_PRECOMPUTED_DFT);
memset(extra_plans,0,sizeof(dft_plan_t)*MAX_EXTRA_PLANS);
if (param_get_int(param_id("direction"),&direction) != 1) {
modinfo("Parameter direction not defined. Setting to FORWARD\n");
direction = 0;
}
options = 0;
if (param_get_int(param_id("mirror"),&tmp) != 1) {
modinfo("Parameter mirror not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_MIRROR;
}
if (param_get_int(param_id("psd"),&tmp) != 1) {
modinfo("Parameter psd not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_PSD;
}
if (param_get_int(param_id("out_db"),&tmp) != 1) {
modinfo("Parameter out_db not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_OUT_DB;
}
if (param_get_int(param_id("normalize"),&tmp) != 1) {
modinfo("Parameter normalize not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_NORMALIZE;
}
dft_size_id = param_id("dft_size");
if (!dft_size_id) {
moderror("Parameter dft_size not defined\n");
return -1;
}
if (dft_plan_multi_c2c(precomputed_dft_len, (!direction)?FORWARD:BACKWARD, NOF_PRECOMPUTED_DFT,
plans)) {
moderror("Precomputing plans\n");
return -1;
}
for (i=0;i<NOF_PRECOMPUTED_DFT;i++) {
plans[i].options = options;
}
return 0;
}
/**@ingroup gen_dft
* \param direction Direction of the dft: 0 computes a dft and 1 computes an idft (default is 0)
* \param mirror 0 computes a normal dft, 1 swaps the two halfes of the input signal before computing
* the dft (used in LTE) (default is 0)
* \param dc_offset Set a null to the 0 subcarrier
* \param psd Set to 1 to compute the power spectral density (untested) (default is 0)
* \param out_db Set to 1 to produce the output results in dB (untested) (default is 0)
* \param dft_size Number of DFT points. This parameter is mandatory.
* \param df Frequency shift (choose a positive value for upconversion and a negative value for
* downconversion) (default is 0--no frequency shift)
* \param fs Sampling rate. This parameter is mandatory if df!=0.
*/
int initialize() {
int tmp;
int i;
memset(plans,0,sizeof(dft_plan_t)*NOF_PRECOMPUTED_DFT);
memset(extra_plans,0,sizeof(dft_plan_t)*MAX_EXTRA_PLANS);
if (param_get_int(param_id("direction"),&direction) != 1) {
modinfo("Parameter direction not defined. Setting to FORWARD\n");
direction = 0;
}
options = 0;
if (param_get_int(param_id("mirror"),&tmp) != 1) {
modinfo("Parameter mirror not defined. Disabling. \n");
} else {
if (tmp == 1) {
options |= DFT_MIRROR_PRE;
} else if (tmp == 2) {
options |= DFT_MIRROR_POS;
}
}
if (param_get_int(param_id("psd"),&tmp) != 1) {
modinfo("Parameter psd not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_PSD;
}
if (param_get_int(param_id("out_db"),&tmp) != 1) {
modinfo("Parameter out_db not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_OUT_DB;
}
if (param_get_int(param_id("dc_offset"),&tmp) != 1) {
modinfo("Parameter dc_offset not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_DC_OFFSET;
}
if (param_get_int(param_id("normalize"),&tmp) != 1) {
modinfo("Parameter normalize not defined. Disabling. \n");
} else {
if (tmp) options |= DFT_NORMALIZE;
}
dft_size_id = param_id("dft_size");
if (!dft_size_id) {
/* moderror("Parameter dft_size not defined\n");
return -1;*/
modinfo("Parameter dft_size not defined. Assuming "
"dft_size = number of input samples on interface 0.\n");
}
if (dft_plan_multi_c2c(precomputed_dft_len, (!direction)?FORWARD:BACKWARD, NOF_PRECOMPUTED_DFT,
plans)) {
moderror("Precomputing plans\n");
return -1;
}
for (i=0;i<NOF_PRECOMPUTED_DFT;i++) {
plans[i].options = options;
}
df_id = param_id("df");
fs_id = param_id("fs");
precalculate_shift_vectors(precomputed_shift_1536, precomputed_shift_reg);
/* assume 1.4 MHz LTE UL Tx (fs = 1.92 MHz, 128 IFFT, df = 7.5 kHz) */
shift = precomputed_shift_reg;
previous_df = df_lte;
previous_fs = 1920000;
previous_dft_size = 128;
shift_increment = 16;
return 0;
}
