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