metrics.h

来自「wcdma模型」· C头文件 代码 · 共 93 行

/*
 |
 | Copyright disclaimer:
 |   This software was developed at the National Institute of Standards
 |   and Technology by employees of the Federal Government in the course
 |   of their official duties. Pursuant to title 17 Section 105 of the
 |   United States Code this software is not subject to copyright
 |   protection and is in the public domain.
 |
 |   We would appreciate acknowledgement if the software is used.
 |
*/

/*
 | Project:     WCDMA simulation environment
 | Module:      Viterbi path metric calculation.
 | Author:      Tommi Makelainen, Nokia/NIST
 | Date:        January 11, 1999
 |
 | History:
 |              January 11, 1999 Tommi Makelainen
 |                      Initial version.
 |
 |              February 16, 1999 Tommi Makelainen
 |                      Corrected branch metric calculation for soft
 |                      bits.
 |
 */

#ifndef METRICS_H
#define METRICS_H
 
/* --------- T Y P E   D E F I N I T I O N S --------------------- */

enum metric_type_type
	{
	HAMMING_METRIC = 0,
	SOFT_METRIC
	};
		
struct MetricTable_type{	
	double Metric_Table[8][8];
	enum metric_type_type Metric_Type;
        double Soft_metric_probabilities[2][64];
        int Soft_metric_weight[2][64];
	};
typedef struct MetricTable_type MetricTable;


/* -------------------------------------------------------------- */
	
void MetricTable_R1o3_Init(
          MetricTable* this,
          enum metric_type_type metric_type,
          double bit_probabilites_0[],
          double bit_probabilites_1[],
          int no_of_probabilities);
	
void MetricTable_R1o2_Init(
          MetricTable* this,
          enum metric_type_type metric_type,
          double bit_probabilites_0[],
          double bit_probabilites_1[],
          int no_of_probabilities);
	
double MetricTable_SoftSymbolMetric(	MetricTable* this,
					int rx_symbol,
					int tx_symbol);
																
double MetricTable_R1o2_SoftSymbolMetric(
          MetricTable *this,
          int rx_symbol,
          int tx_symbol);

double MetricTable_R1o3_SoftSymbolMetric(
          MetricTable *this,
          int rx_symbol,
          int tx_symbol);

double MetricTable_R1o2_GetBranchMetric(
          MetricTable* this,
          int rx_symbol,
          double soft_metric,
          int tx_symbol);

double MetricTable_R1o3_GetBranchMetric(
          MetricTable *this,
          int rx_symbol,
          double soft_metric,
          int tx_symbol);

#endif