47 lines
1.6 KiB
C
47 lines
1.6 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 <math.h>
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#include "PHY/CODING/nrPolar_tools/nr_polar_defs.h"
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uint32_t nr_polar_output_length(uint16_t K, uint16_t E, uint8_t n_max){
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uint8_t n_1, n_2, n_min=5, n;
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uint32_t polar_code_output_length;
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double R_min=1.0/8;
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if ( (E <= (9.0/8)*pow(2,ceil(log2(E))-1)) && (K/E < 9.0/16) ) {
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n_1 = ceil(log2(E))-1;
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} else {
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n_1 = ceil(log2(E));
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}
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n_2 = ceil(log2(K/R_min));
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n=n_max;
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if (n>n_1) n=n_1;
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if (n>n_2) n=n_2;
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if (n<n_min) n=n_min;
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polar_code_output_length = (uint32_t) pow(2.0,n);
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return polar_code_output_length;
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}
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