Sakthivel Velumani
393363e253
RE mapping time is reduced by 10x. Functions are made generic to be later reused for PDSCH RE mapping at gNB.
107 lines
4.3 KiB
C
107 lines
4.3 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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/**********************************************************************
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*
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* FILENAME : dmrs.h
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*
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* MODULE : demodulation reference signals
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*
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* DESCRIPTION : generation of dmrs sequences for NR 5G
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* 3GPP TS 38.211
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*
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************************************************************************/
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#ifndef PTRS_NR_H
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#define PTRS_NR_H
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#include "PHY/defs_nr_UE.h"
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/************** CODE GENERATION ***********************************/
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/************** DEFINE ********************************************/
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/************* STRUCTURES *****************************************/
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/************** VARIABLES *****************************************/
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/************** FUNCTION ******************************************/
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void set_ptrs_symb_idx(uint16_t *ptrs_symbols,
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uint8_t duration_in_symbols,
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uint8_t start_symbol,
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uint8_t L_ptrs,
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uint16_t dmrs_symb_pos);
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unsigned int get_first_ptrs_re(const rnti_t rnti, const uint8_t K_ptrs, const uint16_t nRB, const uint8_t k_RE_ref);
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uint8_t is_ptrs_subcarrier(uint16_t k,
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uint16_t n_rnti,
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uint8_t K_ptrs,
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uint16_t N_RB,
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uint8_t k_RE_ref,
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uint16_t start_sc,
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uint16_t ofdm_symbol_size);
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/*******************************************************************
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*
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* NAME : is_ptrs_symbol
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*
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* PARAMETERS : l ofdm symbol index within slot
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* ptrs_symbols bit mask of ptrs
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*
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* RETURN : 1 if symbol is ptrs, or 0 otherwise
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*
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* DESCRIPTION : 3GPP TS 38.211 6.4.1.2 Phase-tracking reference signal for PUSCH
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*
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*********************************************************************/
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static inline uint8_t is_ptrs_symbol(uint8_t l, uint16_t ptrs_symbols) { return ((ptrs_symbols >> l) & 1); }
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uint8_t get_ptrs_symbols_in_slot(uint16_t l_prime_mask, uint16_t start_symb, uint16_t nb_symb);
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int8_t get_next_ptrs_symbol_in_slot(uint16_t ptrsSymbPos, uint8_t counter, uint8_t nb_symb);
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int8_t get_next_estimate_in_slot(uint16_t ptrsSymbPos,uint16_t dmrsSymbPos, uint8_t counter,uint8_t nb_symb);
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int8_t nr_ptrs_process_slot(uint16_t dmrsSymbPos,
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uint16_t ptrsSymbPos,
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int16_t *estPerSymb,
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uint16_t startSymbIdx,
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uint16_t noSymb
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);
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/* general function to estimate common phase error based upon PTRS */
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void nr_ptrs_cpe_estimation(uint8_t K_ptrs,
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uint8_t ptrsReOffset,
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uint16_t nb_rb,
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uint16_t rnti,
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unsigned char Ns,
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unsigned char symbol,
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uint16_t ofdm_symbol_size,
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int16_t *rxF_comp,
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const uint32_t *gold_seq,
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int16_t *error_est,
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int32_t *ptrs_sc);
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void get_slope_from_estimates(uint8_t start, uint8_t end, int16_t *est_p, double *slope_p);
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void ptrs_estimate_from_slope(int16_t *error_est, double *slope_p, uint8_t start, uint8_t end);
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#endif /* PTRS_NR_H */
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