turbo_code_log_map.h

myturbo 简单使用的turbo系统方针程序 对于理解turbo码的编解码很有帮助

#ifndef	TRUBO_CODE_LOG_MAP_H
#define	TRUBO_CODE_LOG_MAP_H

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>

/*==================================================*/
/*	parameters for simulation	*/

#define N_ITERATION			6				/* number of iteration times */

/*==================================================*/
/* parameters for the code generator */
#define COLUMN_OF_G		4	
#define G_ROW_1			13
#define G_ROW_2			15

/*==================================================*/
/*==================================================*/

#define FRAME_LENGTH  65536
/* code generator */
typedef struct
{
	int N_num_row;
	int K_num_col;
	int *g_matrix;
} TURBO_G;

/* trellis */
typedef struct
{
	int *mx_nextout;
	int *mx_nextstat;
	int *mx_lastout;
	int *mx_laststat;
	
} TURBO_TRELLIS;


/*==================================================*/
/* A number used in Log-MAP decoder */
#define INFTY 1E20

/*==================================================*/

/* global memory */

int *index_randomintlvr;		/* index of random intleaver */


TURBO_G turbo_g;				/* code generator struct */

TURBO_TRELLIS turbo_trellis;	/* turbo_trellis struct */	

float rate_coding;				/* the rate of coding */

/*==================================================*/
/*==================================================*/
/* interfaces to outside */

void TurboCoding(int *turbocoding_source, float *coded_source,
						int *source_length);


void TurboDecoding(float *received_for_decode, int *turbo_decoded,
						  int *received_length, float EbN0dB);



/* Turbo码初始化函数 */
void TurboCodingInit();

/* 释放初始化时的内存 */
void TurboCodingRelease();

/*==================================================*/
/*==================================================*/
/* functions used inside */
int gen_g_matrix(int k_column, int g_row1, int g_row2, int *mx_g_turbo);

void gen_trellis();

void int2bin(int intstat, int *tempstat, int length);

int bin2int(int *binseq, int length);

void gen_source(int *data, int length);

void  AWGN(float *send, float *r, float sigma, int totallength);

void mgrns(double mean,double sigma,double seed,int n,double *a);

float random_turbo();

void gen_rand_index(int length);

void randominterleaver_int(int *data_unintlvr, int *interleaverddata, int length);

void randominterleaver_float(float *data_unintlvr, float *interleaverddata, int length);

void random_deinterlvr_int(int *data_unintlvr, int *interleaverddata, int length);

void random_deinterlvr_float(float *data_unintlvr, float *interleaverddata, int length);


void encoderm_turbo(int *source, int *send_turbo, int len_info);

void rsc_encode(int *source, int *rsc, int terminated, int len_info);

int encode_bit(int inbit, int *stat);


void demultiplex(float *rec_turbo, int len_info, float *yk_turbo);

void Log_MAP_decoder(float *recs_turbo, float *La_turbo, int terminated, float *LLR_all_turbo, int len_total);

float E_algorithm(float x, float y);

float E_algorithm_seq(float *data_seq, int length);

void decision(float *LLR_seq, int length, int *output);

/*==================================================*/

#endif