Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
101 lines
2.5 KiB
C
Executable File
101 lines
2.5 KiB
C
Executable File
#define DEBUG_DAC 1
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#include <math.h>
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#include "PHY/TOOLS/defs.h"
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void dac(double **s_re,
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double **s_im,
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u32 **input,
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u32 input_offset,
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u32 nb_tx_antennas,
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u32 length,
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double amp_dBm,
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u8 B,
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u32 meas_length,
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u32 meas_offset) {
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int i;
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int aa;
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double V=0.0,amp;
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for (i=0;i<length;i++) {
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for (aa=0;aa<nb_tx_antennas;aa++) {
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s_re[aa][i] = ((double)(((short *)input[aa]))[((i+input_offset)<<1)])/(1<<(B-1));
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s_im[aa][i] = ((double)(((short *)input[aa]))[((i+input_offset)<<1)+1])/(1<<(B-1));
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}
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}
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for (i=meas_offset;i<meas_offset+meas_length;i++) {
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for (aa=0;aa<nb_tx_antennas;aa++) {
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V= V + (s_re[aa][i]*s_re[aa][i]) + (s_im[aa][i]*s_im[aa][i]);
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}
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}
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V /= (meas_length);
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#ifdef DEBUG_DAC
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printf("DAC: 10*log10(V)=%f (%f)\n",10*log10(V),V);
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#endif
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if (V) {
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amp = pow(10.0,.1*amp_dBm)/V;
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amp = sqrt(amp);
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} else {
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amp = 1;
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}
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for (i=0;i<length;i++) {
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for (aa=0;aa<nb_tx_antennas;aa++) {
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s_re[aa][i] *= amp;
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s_im[aa][i] *= amp;
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}
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}
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}
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double dac_fixed_gain(double **s_re,
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double **s_im,
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u32 **input,
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u32 input_offset,
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u32 nb_tx_antennas,
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u32 length,
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u32 input_offset_meas,
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u32 length_meas,
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u8 B,
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double txpwr_dBm) {
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int i;
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int aa;
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double amp,amp1;
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amp = pow(10.0,.05*txpwr_dBm);
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amp = amp/sqrt(nb_tx_antennas); //this is amp per tx antenna
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amp1 = sqrt((double)signal_energy((s32*)&input[0][input_offset_meas],length_meas));
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if (nb_tx_antennas>1) {
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amp1 += sqrt((double)signal_energy((s32*)&input[1][input_offset_meas],length_meas));
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amp1/=2;
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}
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//printf("UL: amp1 %f dB (%d,%d), tx_power %f\n",20*log10(amp1),input_offset,input_offset_meas,txpwr_dBm);
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/*
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if (nb_tx_antennas==2)
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amp1 = AMP/2;
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else if (nb_tx_antennas==4)
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amp1 = ((AMP*ONE_OVER_SQRT2_Q15)>>16);
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else //assume (nb_tx_antennas==1)
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amp1 = ((AMP*ONE_OVER_SQRT2_Q15)>>15);
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amp1 = amp1*sqrt(512.0/300.0); //account for loss due to null carriers
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//printf("DL: amp1 %f dB (%d,%d), tx_power %f\n",20*log10(amp1),input_offset,input_offset_meas,txpwr_dBm);
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*/
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for (i=0;i<length;i++) {
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for (aa=0;aa<nb_tx_antennas;aa++) {
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s_re[aa][i] = amp*((double)(((short *)input[aa]))[((i+input_offset)<<1)])/amp1; ///(1<<(B-1));
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s_im[aa][i] = amp*((double)(((short *)input[aa]))[((i+input_offset)<<1)+1])/amp1; ///(1<<(B-1));
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}
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}
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// printf("ener %e\n",signal_energy_fp(s_re,s_im,nb_tx_antennas,length,0));
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return(signal_energy_fp(s_re,s_im,nb_tx_antennas,512,0));
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}
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