157 lines
4.9 KiB
C
157 lines
4.9 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 1.1 (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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#include "PHY/defs_eNB.h"
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#include "PHY/defs_UE.h"
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//#define DEBUG_PC 0
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/*
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double ratioPB[2][4]={{ 1.0,4.0/5.0,3.0/5.0,2.0/5.0},
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{ 5.0/4.0,1.0,3.0/4.0,1.0/2.0}};
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*/
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static const double ratioPB[2][4] = {{0.00000, -0.96910, -2.21849, -3.97940}, // in db
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{0.96910, 0.00000, -1.24939, -3.01030}};
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static const double pa_values[8] = {-6.0, -4.77, -3.0, -1.77, 0.0, 1.0, 2.0, 3.0}; // reported by higher layers
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double get_pa_dB(uint8_t pa)
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{
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AssertFatal(pa<8,"pa %d is not in (0...7)\n",pa);
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return(pa_values[pa]);
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}
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double computeRhoA_eNB(uint8_t pa, LTE_eNB_DLSCH_t *dlsch_eNB, int dl_power_off, uint8_t n_antenna_port)
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{
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double rho_a_dB;
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double sqrt_rho_a_lin;
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rho_a_dB = get_pa_dB(pa);
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if(!dl_power_off) //if dl_power_offset is 0, this is for MU-interference, TM5
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rho_a_dB-=10*log10(2);
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if(n_antenna_port==4) // see TS 36.213 Section 5.2
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rho_a_dB+=10*log10(2);
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sqrt_rho_a_lin= pow(10,(0.05*rho_a_dB));
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if (dlsch_eNB) {
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dlsch_eNB->sqrt_rho_a= (short) (sqrt_rho_a_lin*pow(2,13));
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dlsch_eNB->pa = pa;
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#if DEBUG_PC
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printf("eNB: p_a=%d, value=%f, sqrt_rho_a=%d\n", p_a, pa_values[pdsch_config_dedicated->p_a], dlsch_eNB->sqrt_rho_a);
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#endif
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}
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return(rho_a_dB);
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}
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double computeRhoB_eNB(uint8_t pa,
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uint8_t pb,
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uint8_t n_antenna_port,
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LTE_eNB_DLSCH_t *dlsch_eNB,
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int dl_power_off)
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{
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double rho_a_dB, rho_b_dB;
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double sqrt_rho_b_lin;
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AssertFatal(pa<8,"pa %d is not in (0...7)\n",pa);
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AssertFatal(pb<4,"pb %d is not in (0...3)\n",pb);
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rho_a_dB= computeRhoA_eNB(pa,dlsch_eNB,dl_power_off, n_antenna_port);
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if(n_antenna_port>1)
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rho_b_dB= ratioPB[1][pb] + rho_a_dB;
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else
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rho_b_dB= ratioPB[0][pb] + rho_a_dB;
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sqrt_rho_b_lin= pow(10,(0.05*rho_b_dB));
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if (dlsch_eNB) {
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dlsch_eNB->sqrt_rho_b = (short) (sqrt_rho_b_lin * pow(2, 13));
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dlsch_eNB->pb = pb;
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#ifdef DEBUG_PC
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printf("eNB: n_ant=%d, p_b=%d -> rho_b/rho_a=%f -> sqrt_rho_b=%d\n", n_antenna_port, pb, ratioPB[1][pb], dlsch_eNB->sqrt_rho_b);
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#endif
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}
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return(rho_b_dB);
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}
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double computeRhoA_UE(PDSCH_CONFIG_DEDICATED *pdsch_config_dedicated,
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LTE_UE_DLSCH_t *dlsch_ue,
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unsigned char dl_power_off,
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uint8_t n_antenna_port
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){
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double rho_a_dB;
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double sqrt_rho_a_lin;
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rho_a_dB = get_pa_dB(pdsch_config_dedicated->p_a);
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if(!dl_power_off)
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rho_a_dB-=10*log10(2);
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//if dl_power_offset is 0, this is for MU-interference, TM5. But in practice UE may assume 16 or 64QAM TM4 as multiuser
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if(n_antenna_port==4) // see TS 36.213 Section 5.2
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rho_a_dB=+10*log10(2);
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sqrt_rho_a_lin= pow(10,(0.05*rho_a_dB));
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dlsch_ue->sqrt_rho_a= (short) (sqrt_rho_a_lin*pow(2,13));
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#ifdef DEBUG_PC
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printf("UE: p_a=%d, value=%f, dl_power_off=%d, sqrt_rho_a=%d\n",pdsch_config_dedicated->p_a,pa_values[ pdsch_config_dedicated->p_a],dl_power_off,dlsch_ue->sqrt_rho_a);
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#endif
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return(rho_a_dB);
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}
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double computeRhoB_UE(PDSCH_CONFIG_DEDICATED *pdsch_config_dedicated,
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PDSCH_CONFIG_COMMON *pdsch_config_common,
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uint8_t n_antenna_port,
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LTE_UE_DLSCH_t *dlsch_ue,
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unsigned char dl_power_off)
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{
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double rho_a_dB, rho_b_dB;
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double sqrt_rho_b_lin;
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rho_a_dB= computeRhoA_UE(pdsch_config_dedicated,dlsch_ue,dl_power_off, n_antenna_port);
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if(n_antenna_port>1)
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rho_b_dB= ratioPB[1][pdsch_config_common->p_b] + rho_a_dB;
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else
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rho_b_dB= ratioPB[0][pdsch_config_common->p_b] + rho_a_dB;
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sqrt_rho_b_lin= pow(10,(0.05*rho_b_dB));
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dlsch_ue->sqrt_rho_b= (short) (sqrt_rho_b_lin*pow(2,13));
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#ifdef DEBUG_PC
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printf("UE: p_b=%d, n_ant=%d -> ratio=%f -> sqrt_rho_b=%d\n",pdsch_config_common->p_b, n_antenna_port,ratioPB[1][pdsch_config_common->p_b],dlsch_ue->sqrt_rho_b);
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#endif
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return(rho_b_dB);
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}
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