106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file PHY/LTE_TRANSPORT/pss.c
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* \brief Top-level routines for generating primary synchronization signal (PSS) V8.6 2009-03
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* \author F. Kaltenberger, O. Tonelli, R. Knopp
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* \date 2011
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* \version 0.1
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* \company Eurecom
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* \email: florian.kaltenberger@eurecom.fr, oscar.tonelli@yahoo.it,knopp@eurecom.fr
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* \note
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* \warning
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*/
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/* file: pss.c
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purpose: generate the primary synchronization signals of LTE
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author: florian.kaltenberger@eurecom.fr, oscar.tonelli@yahoo.it
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date: 21.10.2009
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*/
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//#include "defs.h"
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#include "PHY/defs_eNB.h"
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#include "PHY/phy_extern.h"
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#include "targets/RT/USER/lte-softmodem.h"
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int generate_pss(int32_t **txdataF,
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short amp,
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LTE_DL_FRAME_PARMS *frame_parms,
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unsigned short symbol,
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unsigned short slot_offset) {
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unsigned int Nsymb;
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unsigned short k,m,aa,a;
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uint8_t Nid2;
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short *primary_sync;
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Nid2 = frame_parms->Nid_cell % 3;
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switch (Nid2) {
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case 0:
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primary_sync = primary_synch0;
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break;
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case 1:
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primary_sync = primary_synch1;
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break;
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case 2:
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primary_sync = primary_synch2;
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break;
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default:
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LOG_E(PHY,"[PSS] eNb_id has to be 0,1,2\n");
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return(-1);
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}
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a = (frame_parms->nb_antenna_ports_eNB == 1) ? amp: (amp*ONE_OVER_SQRT2_Q15)>>15;
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//printf("[PSS] amp=%d, a=%d\n",amp,a);
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if (IS_SOFTMODEM_BASICSIM)
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/* a hack to remove at some point (the UE doesn't synch with 100 RBs) */
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a = (frame_parms->nb_antenna_ports_eNB == 1) ? 4*amp: (amp*ONE_OVER_SQRT2_Q15)>>15;
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Nsymb = (frame_parms->Ncp==NORMAL)?14:12;
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for (aa=0; aa<frame_parms->nb_antenna_ports_eNB; aa++) {
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// aa = 0;
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// The PSS occupies the inner 6 RBs, which start at
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k = frame_parms->ofdm_symbol_size-3*12+5;
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//printf("[PSS] k = %d\n",k);
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for (m=5; m<67; m++) {
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((short *)txdataF[aa])[2*(slot_offset*Nsymb/2*frame_parms->ofdm_symbol_size +
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symbol*frame_parms->ofdm_symbol_size + k)] =
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(a * primary_sync[2*m]) >> 15;
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((short *)txdataF[aa])[2*(slot_offset*Nsymb/2*frame_parms->ofdm_symbol_size +
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symbol*frame_parms->ofdm_symbol_size + k) + 1] =
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(a * primary_sync[2*m+1]) >> 15;
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k+=1;
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if (k >= frame_parms->ofdm_symbol_size) {
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k++; //skip DC
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k-=frame_parms->ofdm_symbol_size;
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}
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}
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}
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return(0);
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}
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