From fc283a321fcbfe2e3d67dd6db15e9155abe808f0 Mon Sep 17 00:00:00 2001
From: Raymond Knopp <raymond.knopp@eurecom.fr>
Date: Thu, 17 Aug 2017 01:15:46 -0700
Subject: [PATCH] added edci.c, forgotten on last commit
---
openair1/PHY/LTE_TRANSPORT/edci.c | 203 ++++++++++++++++++++++++++++++
1 file changed, 203 insertions(+)
create mode 100755 openair1/PHY/LTE_TRANSPORT/edci.c
diff --git a/openair1/PHY/LTE_TRANSPORT/edci.c b/openair1/PHY/LTE_TRANSPORT/edci.c
new file mode 100755
index 0000000000..49a60ae9e8
--- /dev/null
+++ b/openair1/PHY/LTE_TRANSPORT/edci.c
@@ -0,0 +1,203 @@
+/*
+ * 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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