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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
*/
/**********************************************************************
*
* FILENAME : pbch_nr.c
*
* MODULE : broacast channel
*
* DESCRIPTION : generation of pbch
* 3GPP TS 38.211 7.3.3 Physical broadcast channel
*
************************************************************************/
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include "PHY/defs.h"
#define DEFINE_VARIABLES_PBCH_NR_H
#include "PHY/NR_REFSIG/pbch_nr.h"
#undef DEFINE_VARIABLES_PBCH_NR_H
/*******************************************************************
*
* NAME : pseudo_random_gold_sequence
*
* PARAMETERS :
*
* RETURN : generate pseudo-random sequence which is a length-31 Gold sequence
*
* DESCRIPTION : 3GPP TS 38.211 5.2.1 Pseudo-random sequence generation
* Sequence generation
*
*********************************************************************/
#define NC (1600)
#define GOLD_LENGTH (31)
uint32_t *pseudo_random_gold_sequence(length M_PN, uint32_t cinit)
{
int size = M_PN * sizeof(uint32_t);
int size_x = (sizeof(int)*M_PN + size;
int *x1 = malloc(size_x);
int *x2 = malloc(size_x);
if ((x1 == NULL) || (x2 == NULL)) {
msg("Fatal memory allocation problem \n");
assert(0);
}
else {
bzero(x1, size_x);
bzero(x2, size_x);
}
x1[0] = 1;
for (n = 0; n < 31; n++) {
x2[n] = (cinit >> n) & 0x1;
}
for (int n = 0; n < (NC+M_PN); n++) {
x1(n+31) = (x1(n+3) + x1(n))%2;
x2(n+31) = (x2(n+3) + x2(n+2) + x2(n+1) + x2(n))%2;
}
int *c = calloc(size);
if (c != NULL) {
bzero(c, size);
}
else {
msg("Fatal memory allocation problem \n");
assert(0);
}
for (int n = 0; n < M_PN; n++) {
c(i) = (x1(n+NC) + x2(n+NC))%2;
}
return c;
}