Raymond Knopp
d7c71252f0
Still a remaining issue with the SNR normalization, way too low to get errors.
89 lines
3.0 KiB
C
89 lines
3.0 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/NR_TRANSPORT/nr_transport.h"
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//#define NR_PSS_DEBUG
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int nr_generate_pss( int16_t *d_pss,
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int32_t **txdataF,
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int16_t amp,
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uint8_t ssb_start_symbol,
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nfapi_nr_config_request_t* config,
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NR_DL_FRAME_PARMS *frame_parms)
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{
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int i,k,l,m;
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int16_t a;
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int16_t x[NR_PSS_LENGTH];
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const int x_initial[7] = {0, 1, 1 , 0, 1, 1, 1};
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uint8_t Nid2 = config->sch_config.physical_cell_id.value % 3;
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/// Sequence generation
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for (i=0; i < 7; i++)
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x[i] = x_initial[i];
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for (i=0; i < (NR_PSS_LENGTH - 7); i++) {
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x[i+7] = (x[i + 4] + x[i]) %2;
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}
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for (i=0; i < NR_PSS_LENGTH; i++) {
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m = (i + 43*Nid2)%(NR_PSS_LENGTH);
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d_pss[i] = (1 - 2*x[m]) * 32767;
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}
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#ifdef NR_PSS_DEBUG
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write_output("d_pss.m", "d_pss", (void*)d_pss, NR_PSS_LENGTH, 1, 0);
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printf("PSS: ofdm_symbol_size %d, first_carrier_offset %d\n",frame_parms->ofdm_symbol_size,frame_parms->first_carrier_offset);
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#endif
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/// Resource mapping
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a = (config->rf_config.tx_antenna_ports.value == 1) ? amp : (amp*ONE_OVER_SQRT2_Q15)>>15;
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for (int aa = 0; aa < config->rf_config.tx_antenna_ports.value; aa++)
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{
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// PSS occupies a predefined position (subcarriers 56-182, symbol 0) within the SSB block starting from
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k = frame_parms->first_carrier_offset + frame_parms->ssb_start_subcarrier + 56; //and
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if (k>= frame_parms->ofdm_symbol_size) k-=frame_parms->ofdm_symbol_size;
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l = ssb_start_symbol;
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for (m = 0; m < NR_PSS_LENGTH; m++) {
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// printf("pss: writing position k %d / %d\n",k,frame_parms->ofdm_symbol_size);
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((int16_t*)txdataF[aa])[2*(l*frame_parms->ofdm_symbol_size + k)] = (a * d_pss[m]) >> 15;
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k++;
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if (k >= frame_parms->ofdm_symbol_size)
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k-=frame_parms->ofdm_symbol_size;
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}
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}
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#ifdef NR_PSS_DEBUG
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LOG_M("pss_0.m", "pss_0",
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(void*)&txdataF[0][ssb_start_symbol*frame_parms->ofdm_symbol_size],
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frame_parms->ofdm_symbol_size, 1, 1);
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#endif
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return 0;
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}
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