encodecores.cpp

包括RS码的编码,硬(BM)/软(KV)译码,AWGN信道调制解调仿真. 具体采用何种编译码方案和调制解调方式可在Profile.txt文件中指定(内有详细说明). 且扩展性极好,容易向其中加入新的调

#include <stdafx.h>
#include <stdlib.h>
#include "EncodeCores.h"

void InitSysEncCore(void* pC, const RSCodeParam& rsp) {
	SysEncRegs* se=(SysEncRegs*)pC;
	GF gf=rsp.gf;

	//求RS码的生成多项式及校验多项式,在系统码编码方式中有用
    Polynom mx;
	GFE *tgx;
	InitPolynom(&mx, gf, 1);
	mx.coef[0]=1; mx.coef[1]=0;
	InitPolynom(&se->GX, gf, 0);
	se->GX.coef[0]=1;
    for (int i=0; i<rsp.D-1; i++) {
        mx.coef[1]=gf.Pow2Vec[rsp.m0+i];
		tgx=se->GX.coef;
		se->GX=PolyMPY(&se->GX, &mx);
		free(tgx);
    }    
	Polynom xn=NewPolynom(gf, rsp.N);
	xn.coef[0]=1; xn.coef[rsp.N]=1;
	for (i=1; i<rsp.N; i++) xn.coef[i]=0;
	se->HX=PolyDIV(&xn, &se->GX);
	FreePolynom(&xn);

	se->SR=(GFE*)malloc(sizeof(GFE)*rsp.K);
	
}

void CloseSysEncCore(void* pC) {
	SysEncRegs* se=(SysEncRegs*)pC;
	free(se->SR);
	FreePolynom(&se->GX);
	FreePolynom(&se->HX);
}

void EncodeOneWord_Sys(GFE* codeword, const GFE* msgword,  const RSCodeParam& rsp, void* pC) {
	SysEncRegs* se=(SysEncRegs*)pC;
	Using_Pow2Vec_Vec2Pow_NG(rsp.gf);
	int K_RS=rsp.K, N_RS=rsp.N;
    for (int i=0; i<K_RS; i++) {
		se->SR[i]=msgword[K_RS-i-1];
        codeword[i]=msgword[i];
	}
	int j;
	for (i=K_RS; i<N_RS; i++) {
		codeword[i]=0;
		for (j=0; j<K_RS; j++) codeword[i]^=GFMPY_V2V(se->SR[j], se->HX.coef[j+1], NG);
		for (j=K_RS-1; j>0; j--) se->SR[j]=se->SR[j-1];
		se->SR[0]=codeword[i];
    }
}

void EncodeOneWord_Poly(GFE* codeword, const GFE* msgword,  const RSCodeParam& rsp, void* pC) {
	Using_Pow2Vec_Vec2Pow_NG(rsp.gf);

	GFE expa;
	for (int i=0; i<rsp.N; i++)
	{
		expa=1;
		codeword[i]=0;
		for (int j=0; j<rsp.K; j++)
		{//按信息多项式求值
			codeword[i]^=GFMPY_V2V(msgword[j], expa, NG);
			expa=GFMPY_V2V(expa, Pow2Vec[i], NG);
		}
	}
}


void EncodeOneWord_Void(GFE* codeword, const GFE* msgword, const RSCodeParam& rsp, void* pC) {
	for (int i=0; i<rsp.K; i++) codeword[i]=msgword[i];
}

bool DecodeOneWord_Void(GFE* msgword, const GFE* codeword,  const RSCodeParam& rsp, void* A) {
	for (int i=0; i<rsp.K; i++) {
		msgword[i]=codeword[i];
	}
	return true;
}