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openairinterface5G
openairinterface5G
Commit fc85f44f authored by Florian Kaltenberger's avatar Florian Kaltenberger
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fixed a bug in Alamouti coding (introduced in 7bc37c56)

parent 2129a58e
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Showing with 8 additions and 10 deletions
openair1/PHY/LTE_TRANSPORT/dlsch_modulation.c
View file @ fc85f44f
......@@ -361,8 +361,6 @@ int allocate_REs_in_RB(LTE_DL_FRAME_PARMS *frame_parms,
else if (mimo_mode == ALAMOUTI) {
*re_allocated = *re_allocated + 1;
// normalization for 2 tx antennas
amp = (int16_t)(((int32_t)tmp_amp*ONE_OVER_SQRT2_Q15)>>15);
switch (mod_order0) {
case 2: //QPSK
......@@ -419,8 +417,8 @@ int allocate_REs_in_RB(LTE_DL_FRAME_PARMS *frame_parms,
//((int16_t *)&txdataF[0][tti_offset])[0]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
//((int16_t *)&txdataF[0][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
((int16_t *)&txdataF[0][tti_offset])[0]+=qam_table_s0[qam16_table_offset_re];
((int16_t *)&txdataF[0][tti_offset])[1]+=qam_table_s0[qam16_table_offset_im];
((int16_t *)&txdataF[0][tti_offset])[0]+=(qam_table_s0[qam16_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
((int16_t *)&txdataF[0][tti_offset])[1]+=(qam_table_s0[qam16_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
// Antenna 1 position n Real part -> -x1*
......@@ -450,8 +448,8 @@ int allocate_REs_in_RB(LTE_DL_FRAME_PARMS *frame_parms,
//((int16_t *)&txdataF[1][tti_offset])[0]+=-(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_re])>>15);
//((int16_t *)&txdataF[1][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam16_table[qam16_table_offset_im])>>15);
((int16_t *)&txdataF[1][tti_offset])[0]+=-qam_table_s0[qam16_table_offset_re];
((int16_t *)&txdataF[1][tti_offset])[1]+=qam_table_s0[qam16_table_offset_im];
((int16_t *)&txdataF[1][tti_offset])[0]+=-(qam_table_s0[qam16_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
((int16_t *)&txdataF[1][tti_offset])[1]+=(qam_table_s0[qam16_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
break;
......@@ -494,8 +492,8 @@ int allocate_REs_in_RB(LTE_DL_FRAME_PARMS *frame_parms,
//((int16_t *)&txdataF[0][tti_offset])[0]+=(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
//((int16_t *)&txdataF[0][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
((int16_t *)&txdataF[0][tti_offset])[0]+=qam_table_s0[qam64_table_offset_re];
((int16_t *)&txdataF[0][tti_offset])[1]+=qam_table_s0[qam64_table_offset_im];
((int16_t *)&txdataF[0][tti_offset])[0]+=(qam_table_s0[qam64_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
((int16_t *)&txdataF[0][tti_offset])[1]+=(qam_table_s0[qam64_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
// Antenna 1 => -x1*
......@@ -534,8 +532,8 @@ int allocate_REs_in_RB(LTE_DL_FRAME_PARMS *frame_parms,
//((int16_t *)&txdataF[1][tti_offset])[0]+=-(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_re])>>15);
//((int16_t *)&txdataF[1][tti_offset])[1]+=(int16_t)(((int32_t)amp*qam64_table[qam64_table_offset_im])>>15);
((int16_t *)&txdataF[1][tti_offset])[0]+=-qam_table_s0[qam64_table_offset_re];
((int16_t *)&txdataF[1][tti_offset])[1]+=qam_table_s0[qam64_table_offset_im];
((int16_t *)&txdataF[1][tti_offset])[0]+=-(qam_table_s0[qam64_table_offset_re]*ONE_OVER_SQRT2_Q15)>>15;
((int16_t *)&txdataF[1][tti_offset])[1]+=(qam_table_s0[qam64_table_offset_im]*ONE_OVER_SQRT2_Q15)>>15;
break;
......
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