Commit fc283a32 authored by knopp's avatar knopp

added edci.c, forgotten on last commit

parent 5c0ea2b4
/*
* 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
*/
/*! \file PHY/LTE_TRANSPORT/dci.c
* \brief Implements PDCCH physical channel TX/RX procedures (36.211) and DCI encoding/decoding (36.212/36.213). Current LTE compliance V8.6 2009-03.
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#ifdef USER_MODE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "SCHED/defs.h"
#include "SIMULATION/TOOLS/defs.h" // for taus
#include "PHY/sse_intrin.h"
#include "assertions.h"
#include "T.h"
#include "UTIL/LOG/log.h"
//#define DEBUG_DCI_ENCODING 1
//#define DEBUG_DCI_DECODING 1
//#define DEBUG_PHY
#ifdef Rel14
void generate_edci_top(PHY_VARS_eNB *eNB, int frame, int subframe) {
}
void mpdcch_scrambling(LTE_DL_FRAME_PARMS *frame_parms,
mDCI_ALLOC_t *mdci,
uint16_t i,
uint8_t *e,
uint32_t length)
{
int n;
uint8_t reset;
uint32_t x1, x2, s=0;
uint8_t Nacc=4;
uint16_t j0,j,idelta;
uint16_t i0 = mdci->i0;
// Note: we could actually not do anything if i-i0 < Nacc, save it for later
reset = 1;
// x1 is set in lte_gold_generic
if ((mdci->rnti == 0xFFFE) ||
(mdci->ce_mode == 2)) // CEModeB Note: also for mdci->rnti==SC_RNTI
Nacc=frame_parms->frame_type == FDD ? 4 : 10;
else Nacc=1;
if (frame_parms->frame_type == FDD || Nacc == 1) idelta = 0;
else idelta = Nacc-2;
j0 = (i0+idelta)/Nacc;
j = (i - i0)/Nacc;
// rule for BL/CE UEs from Section 6.8.B2 in 36.211
x2= ((((j0+j)*Nacc)%10)<<9) + mdci->dmrs_scrambling_init;
for (n=0; n<length; n++) {
if ((i&0x1f)==0) {
s = lte_gold_generic(&x1, &x2, reset);
//printf("lte_gold[%d]=%x\n",i,s);
reset = 0;
}
e[i] = (e[i]&1) ^ ((s>>(i&0x1f))&1);
}
}
// this table is the allocation of modulated MPDCCH format 5 symbols to REs
// There are in total 36 REs/ECCE * 4 ECCE/PRB_pair = 144 REs in total/PRB_pair, total is 168 REs => 24 REs for DMRS
// For format 5 there are 6 PRB pairs => 864 REs for 24 total ECCE
static uint16_t mpdcch5tab[864];
void init_mpdcch5tab_normal_regular_subframe_evenNRBDL(PHY_VARS_eNB *eNB) {
int l,k,kmod,re;
LOG_I(PHY,"Inititalizing mpdcch5tab for normal prefix, normal prefix, no PSS/SSS/PBCH, even N_RB_DL\n");
for (l=0,re=0;l<14;l++) {
for (k=0;k<72;k++){
kmod = k % 12;
if (((l!=5) && (l!=6) && (l!=12) && (l!=13)) ||
(((l==5)||(l==6)||(l==12)||(l==13))&&(kmod!=0)&&(kmod!=5)&&(kmod!=10)))
mpdcch5tab[re++]=(l*eNB->frame_parms.ofdm_symbol_size)+k;
}
}
AssertFatal(re==864,"RE count not equal to 864\n");
}
extern uint8_t *generate_dci0(uint8_t *dci,
uint8_t *e,
uint8_t DCI_LENGTH,
uint8_t aggregation_level,
uint16_t rnti);
void generate_mdci_top(PHY_VARS_eNB *eNB, int frame, int subframe,int16_t amp,int32_t **txdataF) {
LTE_eNB_MPDCCH *mpdcch= &eNB->mpdcch_vars[subframe&2];
mDCI_ALLOC_t *mdci;
int coded_bits;
LTE_DL_FRAME_PARMS *fp=&eNB->frame_parms;
int i;
int gain_lin_QPSK;
for (i=0;i<mpdcch->num_dci;i++) {
mdci = &mpdcch->mdci_alloc[i];
AssertFatal(fp->frame_type==FDD,"TDD is not yet supported for MPDCCH\n");
AssertFatal(fp->Ncp == NORMAL,"Extended Prefix not yet supported for MPDCCH\n");
AssertFatal(mdci->L<=24,"L is %d\n",mdci->L);
AssertFatal(fp->N_RB_DL==50 || fp->N_RB_DL==100,"Only N_RB_DL=50,100 for MPDCCH\n");
// Force MPDDCH format 5
AssertFatal(mdci->number_of_prb_pairs==6,"2 or 4 PRB pairs not support yet for MPDCCH\n");
AssertFatal(mdci->reps>0,"mdci->reps==0\n");
// 9 REs/EREG * 4 EREG/ECCE => 36 REs/ECCE => 72 bits/ECCE, so same as regular PDCCH channel encoding
// Note: We only have to run this every Nacc subframes during repetitions, data and scrambling are constant, but we do it for now to simplify during testing
generate_dci0(mdci->dci_pdu,
mpdcch->e+(72*mdci->firstCCE),
mdci->dci_length,
mdci->L,
mdci->rnti);
coded_bits = 72 * mdci->L;
// scrambling
uint16_t absSF = (frame*10)+subframe;
AssertFatal(absSF < 1024,
"Absolute subframe %d = %d*10 + %d > 1023\n",
absSF,frame,subframe);
mpdcch_scrambling(fp,
mdci,
absSF,
mpdcch->e+(72*mdci->firstCCE),
coded_bits);
// Modulation for PDCCH
if (fp->nb_antenna_ports_eNB==1)
gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
else
gain_lin_QPSK = amp/2;
uint8_t *e_ptr = mpdcch->e;
// if (mdci->transmission_type==0) nprime=mdci->rnti&3; // for Localized 2+4 we use 6.8B.5 rule
// map directly to one antenna port for now
// Note: aside from the antenna port mapping, there is no difference between localized and distributed transmission for MPDCCH format 5
// first RE of narrowband
// mpdcchtab5 below contains the mapping from each coded symbol to relative RE avoiding the DMRS
int re_offset = fp->first_carrier_offset + 1 + ((fp->N_RB_DL==100)?1:0) + mdci->narrowband*12*6;
if (re_offset>fp->ofdm_symbol_size) re_offset-=(fp->ofdm_symbol_size-1);
int32_t *txF = &txdataF[0][re_offset];
int32_t yIQ;
for (i=0; i<(coded_bits>>1); i++) {
// QPSK modulation to yIQ
((int16_t*)&yIQ)[0] = (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK; e_ptr++;
((int16_t*)&yIQ)[1] = (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK; e_ptr++;
txF[mpdcch5tab[i+(36*mdci->firstCCE)]] = yIQ;
}
}
}
#endif
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