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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#include <math.h>
#include "PHY/CODING/nrPolar_tools/nr_polar_defs.h"
uint32_t nr_polar_output_length(uint16_t K, uint16_t E, uint8_t n_max){
uint8_t n_1, n_2, n_min=5, n;
uint32_t polar_code_output_length;
double R_min=1.0/8;
if ( (E <= (9.0/8)*pow(2,ceil(log2(E))-1)) && (K/E < 9.0/16) ) {
n_1 = ceil(log2(E))-1;
} else {
n_1 = ceil(log2(E));
}
n_2 = ceil(log2(K/R_min));
n=n_max;
if (n>n_1) n=n_1;
if (n>n_2) n=n_2;
if (n<n_min) n=n_min;
polar_code_output_length = (uint32_t) pow(2.0,n);
return polar_code_output_length;
}