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