gauthier
c7518ecf42
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7885 818b1a75-f10b-46b9-bf7c-635c3b92a50f
139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr
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Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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*******************************************************************************/
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/*! \file PHY/LTE_TRANSPORT/dlsch_scrambling.c
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* \brief Routines for the scrambling procedure of the PDSCH physical channel from 36-211, V8.6 2009-03
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* \author 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: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr
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* \note
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* \warning
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*/
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//#define DEBUG_SCRAMBLING 1
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#include "PHY/defs.h"
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#include "PHY/CODING/extern.h"
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#include "PHY/CODING/lte_interleaver_inline.h"
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#include "defs.h"
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#include "extern.h"
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#include "PHY/extern.h"
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#include "UTIL/LOG/vcd_signal_dumper.h"
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void dlsch_scrambling(LTE_DL_FRAME_PARMS *frame_parms,
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int mbsfn_flag,
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LTE_eNB_DLSCH_t *dlsch,
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int G,
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uint8_t q,
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uint8_t Ns)
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{
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int i,j,k=0;
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// uint8_t reset;
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uint32_t x1, x2, s=0;
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uint8_t *e=dlsch->harq_processes[dlsch->current_harq_pid]->e;
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_ENB_DLSCH_SCRAMBLING, VCD_FUNCTION_IN);
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// reset = 1;
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// x1 is set in lte_gold_generic
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if (mbsfn_flag == 0) {
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x2 = (dlsch->rnti<<14) + (q<<13) + ((Ns>>1)<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.3.1
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} else {
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x2 = ((Ns>>1)<<9) + frame_parms->Nid_cell_mbsfn; //this is c_init in 36.211 Sec 6.3.1
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}
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#ifdef DEBUG_SCRAMBLING
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printf("scrambling: rnti %x, q %d, Ns %d, Nid_cell %d, length %d\n",dlsch->rnti,q,Ns,frame_parms->Nid_cell, G);
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#endif
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s = lte_gold_generic(&x1, &x2, 1);
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for (i=0; i<(1+(G>>5)); i++) {
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for (j=0; j<32; j++,k++) {
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#ifdef DEBUG_SCRAMBLING
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printf("scrambling %d : %d => ",k,e[k]);
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#endif
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e[k] = (e[k]&1) ^ ((s>>j)&1);
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#ifdef DEBUG_SCRAMBLING
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printf("%d\n",e[k]);
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#endif
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}
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s = lte_gold_generic(&x1, &x2, 0);
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}
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_ENB_DLSCH_SCRAMBLING, VCD_FUNCTION_OUT);
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}
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void dlsch_unscrambling(LTE_DL_FRAME_PARMS *frame_parms,
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int mbsfn_flag,
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LTE_UE_DLSCH_t *dlsch,
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int G,
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int16_t* llr,
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uint8_t q,
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uint8_t Ns)
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{
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int i,j,k=0;
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// uint8_t reset;
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uint32_t x1, x2, s=0;
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// reset = 1;
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// x1 is set in first call to lte_gold_generic
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if (mbsfn_flag == 0)
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x2 = (dlsch->rnti<<14) + (q<<13) + ((Ns>>1)<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.3.1
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else
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x2 = ((Ns>>1)<<9) + frame_parms->Nid_cell_mbsfn; //this is c_init in 36.211 Sec 6.3.1
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#ifdef DEBUG_SCRAMBLING
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printf("unscrambling: rnti %x, q %d, Ns %d, Nid_cell %d length %d\n",dlsch->rnti,q,Ns,frame_parms->Nid_cell,G);
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#endif
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s = lte_gold_generic(&x1, &x2, 1);
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for (i=0; i<(1+(G>>5)); i++) {
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for (j=0; j<32; j++,k++) {
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#ifdef DEBUG_SCRAMBLING
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printf("unscrambling %d : %d => ",k,llr[k]);
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#endif
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llr[k] = ((2*((s>>j)&1))-1)*llr[k];
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#ifdef DEBUG_SCRAMBLING
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printf("%d\n",llr[k]);
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#endif
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}
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s = lte_gold_generic(&x1, &x2, 0);
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}
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}
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