lte_dl_mbsfn_channel_estimation.c 34.5 KB
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/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.0  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

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#ifdef USER_MODE
#include <string.h>
#endif
#include "defs.h"
#include "PHY/defs.h"

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//#define DEBUG_CH
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int lte_dl_mbsfn_channel_estimation(PHY_VARS_UE *ue,
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                                    uint8_t eNB_id,
                                    uint8_t eNB_offset,
                                    int subframe,
                                    unsigned char l)
{

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  int pilot[600] __attribute__((aligned(16)));
  unsigned char aarx,aa;
  unsigned int rb;
  short *pil,*rxF,*ch,*ch0,*ch1,*ch11,*chp,*ch_prev;
  int ch_offset,symbol_offset;
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  //  unsigned int n;
  //  int i;

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  int **dl_ch_estimates=ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[0];
  int **rxdataF=ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].rxdataF;
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  ch_offset     = (l*(ue->frame_parms.ofdm_symbol_size));
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  symbol_offset = ch_offset;//phy_vars_ue->lte_frame_parms.ofdm_symbol_size*l;

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  for (aarx=0; aarx<ue->frame_parms.nb_antennas_rx; aarx++) {
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    // generate pilot
    if ((l==2)||(l==6)||(l==10)) {
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      lte_dl_mbsfn_rx(ue,
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                      &pilot[0],
                      subframe,
                      l>>2);
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    } // if symbol==2, return 0 else if symbol = 6, return 1, else if symbol=10 return 2
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    pil   = (short *)&pilot[0];
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    rxF   = (short *)&rxdataF[aarx][((symbol_offset+ue->frame_parms.first_carrier_offset))];
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    ch = (short *)&dl_ch_estimates[aarx][ch_offset];
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    //    if (eNb_id==0)
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    memset(ch,0,4*(ue->frame_parms.ofdm_symbol_size));
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    //***********************************************************************
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    if ((ue->frame_parms.N_RB_DL==6)  ||
        (ue->frame_parms.N_RB_DL==50) ||
        (ue->frame_parms.N_RB_DL==100)) {
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      // Interpolation  and extrapolation;
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      if (l==6) {
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        // ________________________First half of RBs____________________
        ch+=2;
        rxF+=2;
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      }
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      for (rb=0; rb<ue->frame_parms.N_RB_DL; rb++) {
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        // ------------------------1st pilot------------------------

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        if (rb==(ue->frame_parms.N_RB_DL>>1)) {
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          rxF = (short *)&rxdataF[aarx][symbol_offset+1];

          if (l==6)
            rxF+=2;
        }

        ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
        ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
        ch[2] = ch[0]>>1;
        ch[3] = ch[1]>>1;

        /*
          printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
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        if ((rb>0)&&(rb!=(ue->frame_parms.N_RB_DL>>1))) {
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          ch[-2] += ch[2];
          ch[-1] += ch[3];
        } else {
          ch[-2]= ch[0];
          ch[-1]= ch[1];
        }

        // ------------------------2nd pilot------------------------
        ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
        ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
        ch[6] = ch[4]>>1;
        ch[7] = ch[5]>>1;
        ch[2] += ch[6];
        ch[3] += ch[7];
        /*    printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);*/
        // ------------------------3rd pilot------------------------
        ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
        ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
        ch[10] = ch[8]>>1;
        ch[11] = ch[9]>>1;
        ch[6] += ch[10];
        ch[7] += ch[11];
        /*    printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
        // ------------------------4th pilot------------------------
        ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
        ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
        ch[14] = ch[12]>>1;
        ch[15] = ch[13]>>1;
        ch[10] += ch[14];
        ch[11] += ch[15];
        /*    printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
        // ------------------------5th pilot------------------------
        ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
        ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
        ch[18] = ch[16]>>1;
        ch[19] = ch[17]>>1;
        ch[14] += ch[18];
        ch[15] += ch[19];
        /*    printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[16],rxF[17],ch[16],ch[17]);*/
        // ------------------------6th pilot------------------------
        ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
        ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);

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        if ((rb<(ue->frame_parms.N_RB_DL-1))&&
            (rb!=((ue->frame_parms.N_RB_DL>>1)-1))) {
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          ch[22] = ch[20]>>1;
          ch[23] = ch[21]>>1;
          ch[18] += ch[22];
          ch[19] += ch[23];
        } else {
          ch[22] = ch[20];
          ch[23] = ch[21];
          ch[18] += (ch[22]>>1);
          ch[19] += (ch[23]>>1);
        }

        /*    printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);
            printf("ch11 (%d,%d)\n",ch[22],ch[23]);*/
        pil+=12;
        ch+=24;
        rxF+=24;
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      }
    }
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    //*********************************************************************
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    else if (ue->frame_parms.N_RB_DL==25) {
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      //printf("Channel estimation\n");
      //------------------------ loop over first 12 RBs------------------------
      if (l==6) {
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        // ________________________First half of RBs____________________
        ch+=2;
        rxF+=2;

        for (rb=0; rb<12; rb++) {
          // ------------------------1st pilot------------------------

          ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
          ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
          ch[2] = ch[0]>>1;
          ch[3] = ch[1]>>1;

          /*
          printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
          if (rb>0) {
            ch[-2] += ch[2];
            ch[-1] += ch[3];
          } else {
            ch[-2]= ch[0];
            ch[-1]= ch[1];
            // ch[-2]= (ch[0]>>1)*3- ch[4];
            // ch[-1]= (ch[1]>>1)*3- ch[5];
          }

          // ------------------------2nd pilot------------------------
          ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
          ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
          ch[6] = ch[4]>>1;
          ch[7] = ch[5]>>1;
          ch[2] += ch[6];
          ch[3] += ch[7];
          /*    printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);*/
          // ------------------------3rd pilot------------------------
          ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
          ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
          ch[10] = ch[8]>>1;
          ch[11] = ch[9]>>1;
          ch[6] += ch[10];
          ch[7] += ch[11];
          /*    printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
          // ------------------------4th pilot------------------------
          ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
          ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
          ch[14] = ch[12]>>1;
          ch[15] = ch[13]>>1;
          ch[10] += ch[14];
          ch[11] += ch[15];
          /*    printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
          // ------------------------5th pilot------------------------
          ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
          ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
          ch[18] = ch[16]>>1;
          ch[19] = ch[17]>>1;
          ch[14] += ch[18];
          ch[15] += ch[19];
          /*    printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[16],rxF[17],ch[16],ch[17]);*/
          // ------------------------6th pilot------------------------
          ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
          ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);
          ch[22] = ch[20]>>1;
          ch[23] = ch[21]>>1;
          ch[18] += ch[22];
          ch[19] += ch[23];
          /*    printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
           rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);
           printf("ch11 (%d,%d)\n",ch[22],ch[23]);*/
          pil+=12;
          ch+=24;
          rxF+=24;
        }

        // Middle RB
        // ________________________First half of RB___________________
        // ------------------------1st pilot---------------------------
        chp = ch-24;
        ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
        ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
        ch[2] = ch[0]>>1;
        ch[3] = ch[1]>>1;

        chp[22] += ch[2];
        chp[23] += ch[3];
        /*  printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
        //printf("interp0: chp[0] (%d,%d) ch23 (%d,%d)\n",chp[22],chp[23],ch[2],ch[3]);
        // ------------------------2nd pilot------------------------
        ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
        ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
        ch[6] = ch[4]>>1;
        ch[7] = ch[5]>>1;
        ch[2] += ch[6];
        ch[3] += ch[7];
        /*  printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
               rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);
               printf("interp1: ch23 (%d,%d) \n",ch[2],ch[3]);*/
        // ------------------------3rd pilot------------------------
        ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
        ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
        ch[10] = ch[8]>>1;
        ch[11] = ch[9]>>1;
        //ch[10] = (ch[8])/3;
        //ch[11] = (ch[9])/3;
        ch[6] += ch[10];
        ch[7] += ch[11];
        /*  printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
        // printf("Second half\n");

        // ________________________Second half of RB____________________

        rxF   = (short *)&rxdataF[aarx][((symbol_offset+2))];

        // 4th pilot
        ch[12] = (short)(((int)pil[6]*rxF[0] - (int)pil[7]*rxF[1])>>15);
        ch[13] = (short)(((int)pil[6]*rxF[1] + (int)pil[7]*rxF[0])>>15);
        ch[14] = ch[12]>>1;
        ch[15] = ch[13]>>1;
        ch[10] = (ch[8]/3)+(ch[12]<<1)/3;
        ch[11] = (ch[9]/3)+(ch[13]<<1)/3;
        /*  printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[6],pil[7],rxF[0],rxF[1],ch[12],ch[13]);*/
        // ------------------------5th pilot------------------------
        ch[16] = (short)(((int)pil[8]*rxF[4] - (int)pil[9]*rxF[5])>>15);
        ch[17] = (short)(((int)pil[8]*rxF[5] + (int)pil[9]*rxF[4])>>15);
        ch[18] = ch[16]>>1;
        ch[19] = ch[17]>>1;
        ch[14] += ch[18];
        ch[15] += ch[19];
        /*  printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[4],pil[5],rxF[4],rxF[5],ch[16],ch[17]);*/
        // ------------------------6th pilot------------------------
        ch[20] = (short)(((int)pil[10]*rxF[8] - (int)pil[11]*rxF[9])>>15);
        ch[21] = (short)(((int)pil[10]*rxF[9] + (int)pil[11]*rxF[8])>>15);
        ch[22] = ch[20]>>1;
        ch[23] = ch[21]>>1;
        ch[18] += ch[22];
        ch[19] += ch[23];
        /*        printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[10],pil[11],rxF[8],rxF[9],ch[20],ch[21]);*/
        pil+=12;
        ch+=24;
        rxF+=12;

        // ________________________Second half of RBs____________________
        for (rb=0; rb<11; rb++) {
          // ------------------------1st pilot---------------------------
          ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
          ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
          ch[2] = ch[0]>>1;
          ch[3] = ch[1]>>1;
          /*    printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
          //if (rb>0) {
          ch[-2] += ch[2];
          ch[-1] += ch[3];
          //}
          // ------------------------2nd pilot------------------------
          ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
          ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
          ch[6] = ch[4]>>1;
          ch[7] = ch[5]>>1;
          ch[2] += ch[6];
          ch[3] += ch[7];
          /*    printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);*/
          // ------------------------3rd pilot------------------------
          ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
          ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
          ch[10] = ch[8]>>1;
          ch[11] = ch[9]>>1;
          ch[6] += ch[10];
          ch[7] += ch[11];
          /*    printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]); */
          // ------------------------4th pilot------------------------
          ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
          ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
          ch[14] = ch[12]>>1;
          ch[15] = ch[13]>>1;
          ch[10] += ch[14];
          ch[11] += ch[15];
          /*    printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
          // ------------------------5th pilot------------------------
          ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
          ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
          ch[18] = ch[16]>>1;
          ch[19] = ch[17]>>1;
          ch[14] += ch[18];
          ch[15] += ch[19];
          /*    printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[4],pil[5],rxF[16],rxF[17],ch[16],ch[17]);*/
          // ------------------------6th pilot------------------------
          ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
          ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);
          ch[22] = ch[20]>>1;
          ch[23] = ch[21]>>1;
          ch[18] += ch[22];
          ch[19] += ch[23];
          /*    printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);*/
          pil+=12;
          ch+=24;
          rxF+=24;
        }

        // ------------------------Last PRB ---------------------------
        // ------------------------1st pilot---------------------------
        ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
        ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
        ch[2] = ch[0]>>1;
        ch[3] = ch[1]>>1;
        ch[-2] += ch[2];
        ch[-1] += ch[3];
        /*  printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
        // ------------------------2nd pilot------------------------
        ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
        ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
        ch[6] = ch[4]>>1;
        ch[7] = ch[5]>>1;
        ch[2] += ch[6];
        ch[3] += ch[7];
        /*  printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);  */
        // ------------------------3rd pilot------------------------
        ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
        ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
        ch[10] = ch[8]>>1;
        ch[11] = ch[9]>>1;
        ch[6] += ch[10];
        ch[7] += ch[11];
        /*  printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
        // ------------------------4th pilot------------------------
        ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
        ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
        ch[14] = ch[12]>>1;
        ch[15] = ch[13]>>1;
        ch[10] += ch[14];
        ch[11] += ch[15];
        /*  printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
        // ------------------------5th pilot------------------------
        ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
        ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
        ch[18] = ch[16]>>1;
        ch[19] = ch[17]>>1;
        ch[14] += ch[18];
        ch[15] += ch[19];
        /*  printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[4],pil[5],rxF[16],rxF[17],ch[16],ch[17]);*/
        // ------------------------6th pilot------------------------
        ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
        ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);
        ch[18] += ch[20]>>1;
        ch[19] += ch[21]>>1;
        /*  printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);     */
      }

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      //**********************************************************************
      // for l=2 and l=10
      if (l!=6) {
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        // extrapolate last channel estimate
        for (rb=0; rb<12; rb++) {
          // ------------------------1st pilot---------------------------
          ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
          ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
          ch[2] = ch[0]>>1;
          ch[3] = ch[1]>>1;
          ch[-2] += ch[2];
          ch[-1] += ch[3];
          /*    printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
          // ------------------------2nd pilot------------------------
          ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
          ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
          ch[6] = ch[4]>>1;
          ch[7] = ch[5]>>1;
          ch[2] += ch[6];
          ch[3] += ch[7];
          /*    printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);*/
          // ------------------------3rd pilot------------------------
          ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
          ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
          ch[10] = ch[8]>>1;
          ch[11] = ch[9]>>1;
          ch[6] += ch[10];
          ch[7] += ch[11];
          /*    printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/

          // ------------------------4th pilot------------------------
          ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
          ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
          ch[14] = ch[12]>>1;
          ch[15] = ch[13]>>1;
          ch[10] += ch[14];
          ch[11] += ch[15];
          /*    printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
          // ------------------------5th pilot------------------------
          ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
          ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
          ch[18] = ch[16]>>1;
          ch[19] = ch[17]>>1;
          ch[14] += ch[18];
          ch[15] += ch[19];
          /*    printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[32],rxF[33],ch[16],ch[17]);*/
          // ------------------------6th pilot------------------------
          ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
          ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);
          ch[22] = ch[20]>>1;
          ch[23] = ch[21]>>1;
          ch[18] += ch[22];
          ch[19] += ch[23];
          /*    printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);*/
          pil+=12;
          ch+=24;
          rxF+=24;
        }

        // ------------------------middle PRB--------------------------
        // ------------------------1st pilot---------------------------

        ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
        ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
        ch[2] = ch[0]>>1;
        ch[3] = ch[1]>>1;
        /*  printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
        ch[-2] += ch[2];
        ch[-1] += ch[3];
        // ------------------------2nd pilot------------------------
        ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
        ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
        ch[6] = ch[4]>>1;
        ch[7] = ch[5]>>1;
        ch[2] += ch[6];
        ch[3] += ch[7];
        /*        printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);*/
        // ------------------------3rd pilot------------------------
        ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
        ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
        ch[10] = ch[8]>>1;
        ch[11] = ch[9]>>1;
        ch[6] += ch[10];
        ch[7] += ch[11];
        /*        printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
        // printf("Second half\n");

        // ------------------------Second half of RBs---------------------//
        rxF   = (short *)&rxdataF[aarx][((symbol_offset+1))];
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        // ---------------------------------------------------------------//
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        // ------------------------4th pilot------------------------
        ch[12] = (short)(((int)pil[6]*rxF[0] - (int)pil[7]*rxF[1])>>15);
        ch[13] = (short)(((int)pil[6]*rxF[1] + (int)pil[7]*rxF[0])>>15);
        ch[14] = ch[12]>>1;
        ch[15] = ch[13]>>1;
        ch[10] = (ch[12]/3)+(ch[8]<<1)/3;
        ch[11] = (ch[13]/3)+(ch[9]<<1)/3;
        /*        printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
            rb,pil[6],pil[7],rxF[0],rxF[1],ch[12],ch[13]);*/
        // ------------------------5th pilot------------------------
        ch[16] = (short)(((int)pil[8]*rxF[4] - (int)pil[9]*rxF[5])>>15);
        ch[17] = (short)(((int)pil[8]*rxF[5] + (int)pil[9]*rxF[4])>>15);
        ch[18] = ch[16]>>1;
        ch[19] = ch[17]>>1;
        ch[14] += ch[18];
        ch[15] += ch[19];
        /*  printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[4],pil[5],rxF[4],rxF[5],ch[8],ch[17]);*/
        // ------------------------6th pilot------------------------
        ch[20] = (short)(((int)pil[10]*rxF[8] - (int)pil[11]*rxF[9])>>15);
        ch[21] = (short)(((int)pil[10]*rxF[9] + (int)pil[11]*rxF[8])>>15);
        ch[22] = ch[20]>>1;
        ch[23] = ch[21]>>1;
        ch[18] += ch[22];
        ch[19] += ch[23];
        /*  printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
          rb,pil[10],pil[11],rxF[8],rxF[9],ch[20],ch[21]);*/
        pil+=12;
        ch+=24;
        rxF+=12;

        // ________________________Second half of RBs____________________
        for (rb=0; rb<11; rb++) {
          // ------------------------1st pilot---------------------------
          ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
          ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
          ch[2] = ch[0]>>1;
          ch[3] = ch[1]>>1;
          ch[-2] += ch[2];
          ch[-1] += ch[3];

          /*    printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
          // ------------------------2nd pilot------------------------
          ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
          ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
          ch[6] = ch[4]>>1;
          ch[7] = ch[5]>>1;
          ch[2] += ch[6];
          ch[3] += ch[7];
          /*    printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);  */
          // ------------------------3rd pilot------------------------
          ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
          ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
          ch[10] = ch[8]>>1;
          ch[11] = ch[9]>>1;
          ch[6] += ch[10];
          ch[7] += ch[11];
          /*    printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
          // ------------------------4th pilot------------------------
          ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
          ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
          ch[14] = ch[12]>>1;
          ch[15] = ch[13]>>1;
          ch[10] += ch[14];
          ch[11] += ch[15];
          /*    printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
          // ------------------------5th pilot------------------------
          ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
          ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
          ch[18] = ch[16]>>1;
          ch[19] = ch[17]>>1;
          ch[14] += ch[18];
          ch[15] += ch[19];
          /*    printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[4],pil[5],rxF[16],rxF[17],ch[16],ch[17]);*/
          // ------------------------6th pilot------------------------
          ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
          ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);
          ch[22] = ch[20]>>1;
          ch[23] = ch[21]>>1;
          ch[18] += ch[22];
          ch[19] += ch[23];
          /*    printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
            13+rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);*/
          pil+=12;
          ch+=24;
          rxF+=24;
        }

        // ------------------------Last PRB ---------------------------
        // ------------------------1st pilot---------------------------
        ch[0] = (short)(((int)pil[0]*rxF[0] - (int)pil[1]*rxF[1])>>15);
        ch[1] = (short)(((int)pil[0]*rxF[1] + (int)pil[1]*rxF[0])>>15);
        ch[2] = ch[0]>>1;
        ch[3] = ch[1]>>1;
        ch[-2] += ch[2];
        ch[-1] += ch[3];
        /*  printf("rb %d: pil0 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[0],pil[1],rxF[0],rxF[1],ch[0],ch[1]);*/
        // ------------------------2nd pilot------------------------
        ch[4] = (short)(((int)pil[2]*rxF[4] - (int)pil[3]*rxF[5])>>15);
        ch[5] = (short)(((int)pil[2]*rxF[5] + (int)pil[3]*rxF[4])>>15);
        ch[6] = ch[4]>>1;
        ch[7] = ch[5]>>1;
        ch[2] += ch[6];
        ch[3] += ch[7];
        /*  printf("rb %d: pil1 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[2],pil[3],rxF[4],rxF[5],ch[4],ch[5]);  */
        // ------------------------3rd pilot------------------------
        ch[8] = (short)(((int)pil[4]*rxF[8] - (int)pil[5]*rxF[9])>>15);
        ch[9] = (short)(((int)pil[4]*rxF[9] + (int)pil[5]*rxF[8])>>15);
        ch[10] = ch[8]>>1;
        ch[11] = ch[9]>>1;
        ch[6] += ch[10];
        ch[7] += ch[11];
        /*  printf("rb %d: pil2 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[4],pil[5],rxF[8],rxF[9],ch[8],ch[9]);*/
        // ------------------------4th pilot------------------------
        ch[12] = (short)(((int)pil[6]*rxF[12] - (int)pil[7]*rxF[13])>>15);
        ch[13] = (short)(((int)pil[6]*rxF[13] + (int)pil[7]*rxF[12])>>15);
        ch[14] = ch[12]>>1;
        ch[15] = ch[13]>>1;
        ch[10] += ch[14];
        ch[11] += ch[15];
        /*  printf("rb %d: pil3 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[6],pil[7],rxF[12],rxF[13],ch[12],ch[13]);*/
        // ------------------------5th pilot------------------------
        ch[16] = (short)(((int)pil[8]*rxF[16] - (int)pil[9]*rxF[17])>>15);
        ch[17] = (short)(((int)pil[8]*rxF[17] + (int)pil[9]*rxF[16])>>15);
        ch[18] = ch[16]>>1;
        ch[19] = ch[17]>>1;
        ch[14] += ch[18];
        ch[15] += ch[19];
        /*  printf("rb %d: pil4 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[4],pil[5],rxF[16],rxF[17],ch[16],ch[17]);*/
        // ------------------------6th pilot------------------------
        ch[20] = (short)(((int)pil[10]*rxF[20] - (int)pil[11]*rxF[21])>>15);
        ch[21] = (short)(((int)pil[10]*rxF[21] + (int)pil[11]*rxF[20])>>15);
        ch[22]= (ch[20]>>1)*3- ch[18];
        ch[23]= (ch[21]>>1)*3- ch[19];
        ch[18] += ch[20]>>1;
        ch[19] += ch[21]>>1;
        /*  printf("rb %d: pil5 (%d,%d) x (%d,%d) = (%d,%d)\n",
          13+rb,pil[10],pil[11],rxF[20],rxF[21],ch[20],ch[21]);*/
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      }
    }
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    //------------------------Temporal Interpolation ------------------------------
    if (l==6) {
      ch = (short *)&dl_ch_estimates[aarx][ch_offset];
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      //        printf("Interpolating ch 2,6 => %d\n",ch_offset);
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      ch_prev = (short *)&dl_ch_estimates[aarx][2*(ue->frame_parms.ofdm_symbol_size)];
      ch0 = (short *)&dl_ch_estimates[aarx][0*(ue->frame_parms.ofdm_symbol_size)];
      memcpy(ch0,ch_prev,4*ue->frame_parms.ofdm_symbol_size);
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      ch1 = (short *)&dl_ch_estimates[aarx][1*(ue->frame_parms.ofdm_symbol_size)];
      memcpy(ch1,ch_prev,4*ue->frame_parms.ofdm_symbol_size);
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      // 3/4 ch2 + 1/4 ch6 => ch3
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      multadd_complex_vector_real_scalar(ch_prev,24576,ch_prev+(2*(ue->frame_parms.ofdm_symbol_size)),1,ue->frame_parms.ofdm_symbol_size);
      multadd_complex_vector_real_scalar(ch,8192,ch_prev+(2*(ue->frame_parms.ofdm_symbol_size)),0,ue->frame_parms.ofdm_symbol_size);
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      // 1/2 ch2 + 1/2 ch6 => ch4
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      multadd_complex_vector_real_scalar(ch_prev,16384,ch_prev+(4*(ue->frame_parms.ofdm_symbol_size)),1,ue->frame_parms.ofdm_symbol_size);
      multadd_complex_vector_real_scalar(ch,16384,ch_prev+(4*(ue->frame_parms.ofdm_symbol_size)),0,ue->frame_parms.ofdm_symbol_size);
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      // 1/4 ch2 + 3/4 ch6 => ch5
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      multadd_complex_vector_real_scalar(ch_prev,8192,ch_prev+(6*((ue->frame_parms.ofdm_symbol_size))),1,ue->frame_parms.ofdm_symbol_size);
      multadd_complex_vector_real_scalar(ch,24576,ch_prev+(6*((ue->frame_parms.ofdm_symbol_size))),0,ue->frame_parms.ofdm_symbol_size);
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    }
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    if (l==10) {
      ch = (short *)&dl_ch_estimates[aarx][ch_offset];
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      ch_prev = (short *)&dl_ch_estimates[aarx][6*(ue->frame_parms.ofdm_symbol_size)];
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      // 3/4 ch6 + 1/4 ch10 => ch7
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      multadd_complex_vector_real_scalar(ch_prev,24576,ch_prev+(2*(ue->frame_parms.ofdm_symbol_size)),1,ue->frame_parms.ofdm_symbol_size);
      multadd_complex_vector_real_scalar(ch,8192,ch_prev+(2*(ue->frame_parms.ofdm_symbol_size)),0,ue->frame_parms.ofdm_symbol_size);
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      // 1/2 ch6 + 1/2 ch10 => ch8
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      multadd_complex_vector_real_scalar(ch_prev,16384,ch_prev+(4*(ue->frame_parms.ofdm_symbol_size)),1,ue->frame_parms.ofdm_symbol_size);
      multadd_complex_vector_real_scalar(ch,16384,ch_prev+(4*(ue->frame_parms.ofdm_symbol_size)),0,ue->frame_parms.ofdm_symbol_size);
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      // 1/4 ch6 + 3/4 ch10 => ch9
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      multadd_complex_vector_real_scalar(ch_prev,8192,ch_prev+(6*((ue->frame_parms.ofdm_symbol_size))),1,ue->frame_parms.ofdm_symbol_size);
      multadd_complex_vector_real_scalar(ch,24576,ch_prev+(6*((ue->frame_parms.ofdm_symbol_size))),0,ue->frame_parms.ofdm_symbol_size);
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      // 5/4 ch10 - 1/4 ch6 => ch11
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      // Ch11
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      ch_prev = (short *)&dl_ch_estimates[aarx][10*(ue->frame_parms.ofdm_symbol_size)];
      ch11 = (short *)&dl_ch_estimates[aarx][11*(ue->frame_parms.ofdm_symbol_size)];
      memcpy(ch11,ch_prev,4*ue->frame_parms.ofdm_symbol_size);
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    }
  }

  // do ifft of channel estimate
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  for (aa=0; aa<ue->frame_parms.nb_antennas_rx*ue->frame_parms.nb_antennas_tx; aa++) {
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    if (ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[eNB_offset][aa]) {
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      switch (ue->frame_parms.N_RB_DL) {
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      case 6:
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	idft128((int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[eNB_offset][aa][8],
		(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates_time[eNB_offset][aa],
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		1);
	break;
      case 25:
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	idft512((int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[eNB_offset][aa][8],
		(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates_time[eNB_offset][aa],
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		1);
	break;
      case 50:
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	idft1024((int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[eNB_offset][aa][8],
		(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates_time[eNB_offset][aa],
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		1);
	break;
      case 75:
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	idft1536((int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[eNB_offset][aa][8],
		 (int16_t*) ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates_time[eNB_offset][aa],
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		 1);
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	break;
      case 100:
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760 761
	idft2048((int16_t*) &ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates[eNB_offset][aa][8],
		(int16_t*) ue->common_vars.common_vars_rx_data_per_thread[subframe%RX_NB_TH].dl_ch_estimates_time[eNB_offset][aa],
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		1);
	break;
      default:
	break;
      }
    }
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  }
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  return(0);
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}