94 lines
2.9 KiB
C
94 lines
2.9 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 1.0 (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/NR_TRANSPORT/nr_tbs_tools.c
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* \brief Top-level routines for implementing LDPC-coded (DLSCH) transport channels from 38-212, 15.2
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* \author H.Wang
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* \date 2018
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* \version 0.1
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* \company Eurecom
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* \email:
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* \note
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* \warning
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*/
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#include "nr_transport_common_proto.h"
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#include "PHY/CODING/coding_defs.h"
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#include "PHY/defs_nr_common.h"
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uint32_t
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nr_get_G(uint16_t nb_rb, uint16_t nb_symb_sch, uint8_t nb_re_dmrs, uint16_t length_dmrs, uint32_t unav_res, uint8_t Qm, uint8_t Nl)
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{
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uint32_t G = ((NR_NB_SC_PER_RB * nb_symb_sch) - (nb_re_dmrs * length_dmrs)) * nb_rb * Qm * Nl;
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G -= unav_res * Qm * Nl;
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return (G);
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}
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uint32_t nr_get_E(uint32_t G, uint8_t C, uint8_t Qm, uint8_t Nl, uint8_t r)
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{
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uint32_t E;
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uint8_t Cprime = C; // assume CBGTI not present
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AssertFatal(Nl > 0, "Nl is 0\n");
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AssertFatal(Qm > 0, "Qm is 0\n");
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if (r <= Cprime - ((G / (Nl * Qm)) % Cprime) - 1)
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E = Nl * Qm * (G / (Nl * Qm * Cprime));
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else
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E = Nl * Qm * ((G / (Nl * Qm * Cprime)) + 1);
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LOG_D(PHY, "nr_get_E : (G %d, C %d, Qm %d, Nl %d, r %d), E %d\n", G, C, Qm, Nl, r, E);
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return E;
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}
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static const uint8_t index_k0[2][4] = {{0, 17, 33, 56}, {0, 13, 25, 43}};
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int nr_get_R_ldpc_decoder(int rvidx, int E, int BG, int Z, int *llrLen, int round)
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{
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AssertFatal(BG == 1 || BG == 2, "Unknown BG %d\n", BG);
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int Ncb = (BG == 1) ? (66 * Z) : (50 * Z);
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int infoBits = (index_k0[BG - 1][rvidx] * Z + E);
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if (round == 0)
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*llrLen = infoBits;
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if (infoBits > Ncb)
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infoBits = Ncb;
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if (infoBits > *llrLen)
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*llrLen = infoBits;
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int sysBits = (BG == 1) ? (22 * Z) : (10 * Z);
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float decoderR = (float)sysBits / (infoBits + 2 * Z);
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if (BG == 2)
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if (decoderR < 0.3333)
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return 15;
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else if (decoderR < 0.6667)
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return 13;
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else
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return 23;
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else if (decoderR < 0.6667)
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return 13;
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else if (decoderR < 0.8889)
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return 23;
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else
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return 89;
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}
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