📄 wib_dl_cc.c
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};
/*
* *************************************************************************************
* *
* CC Encoder *
* *
* -------------------------------------------------------------------------------------
*/
/*
* *************************************************************************************
* function: convolution code module
* parameters:
* UINT8 *p_dat_in, //
* UINT8 *p_dat_out // output points.
* UINT16 dat_len, // p_dat_in length in bit.
* UINT8 cc_pun // 2:1/2,4:2/3,6:3/4
* return: void
* description: convolution code module
* -------------------------------------------------------------------------------------
*/
int dl_cc_enc
(
UINT8 *p_dat_in, // input bit
UINT8 *p_dat_out, // CC output bit
UINT16 dat_len, // input bit length(p_dat_in).
UINT8 rate_id
)
{
UINT8 polya = 121;
UINT8 polyb = 91;
UINT8 cc_pun = 0x00;
UINT8 cc_dpun = 0x00;
UINT16 i;
UINT16 pun_cir_len;
UINT8 wa = 0x00;
UINT8 wb = 0x00;
UINT8 conv_code0 = 0x00;
UINT8 conv_code1 = 0x00;
UINT8 conv_shreg = 0x00;
UINT8 *conv_code = NULL;
UINT8 *dat_in = NULL;
UINT8 *dat_out = NULL;
//parameter Generate
switch(rate_id) {
case 0 :
cc_pun = 0x02;
cc_dpun = 0x02;
break;
case 1 :
cc_pun = 0x06;
cc_dpun = 0x04;
break;
case 2 :
cc_pun = 0x02;
cc_dpun = 0x02;
break;
case 3 :
cc_pun = 0x06;
cc_dpun = 0x04;
break;
case 4 :
cc_pun = 0x02;
cc_dpun = 0x02;
break;
case 5 :
cc_pun = 0x04;
cc_dpun = 0x03;
break;
case 6 :
cc_pun = 0x06;
cc_dpun = 0x04;
break;
default :
printf("<<<< Error: Not a valid rate_id for CC code(dl_cc_enc)! >>>>\n");
break;
}
//memory malloc
conv_code = malloc(2*dat_len*sizeof(UINT8));
if(conv_code ==NULL) {
printf("conv_code in dl_cc_enc malloc fail!!\n");
return(-1);
}
dat_in = malloc(dat_len*sizeof(UINT8));
if(dat_in ==NULL) {
printf("dat_in in dl_cc_enc malloc fail!!\n");
return(-1);
}
dat_out = malloc(dat_len*2*cc_dpun/cc_pun*sizeof(UINT8));
if(dat_out ==NULL) {
printf("dat_out in dl_cc_enc malloc fail!!\n");
return(-1);
}
ByteToBit
(
p_dat_in, //Byte
dat_in, //Bit
dat_len //Bit length
);
//convencation code
// initializing
conv_shreg = (UINT8)(((dat_in[dat_len-6]<<1)&0x02)|((dat_in[dat_len-5]<<2)&0x04)|((dat_in[dat_len-4]<<3)&0x08)|((dat_in[dat_len-3]<<4)&0x10)|((dat_in[dat_len-2]<<5)&0x20)|((dat_in[dat_len-1]<<6)&0x40));
for(i=0; i < dat_len; i++) {
conv_shreg = (UINT8)(((conv_shreg >>1) & 0x3F) | ((dat_in[i] <<6) & 0x40));
wa = (UINT8)((conv_shreg & polya) & 0x7F);
wb = (UINT8)((conv_shreg & polyb) & 0x7F);
conv_code0 = (UINT8)(((wa >>6) & 0x01) ^ ((wa >>5) & 0x01) ^ ((wa >>4) & 0x01) ^ ((wa >>3) & 0x01) ^ ((wa >>2) &0x01) ^ ((wa >>1) & 0x01) ^ (wa & 0x01));
conv_code1 = (UINT8)(((wb >>6) & 0x01) ^ ((wb >>5) & 0x01) ^ ((wb >>4) & 0x01) ^ ((wb >>3) & 0x01) ^ ((wb >>2) &0x01) ^ ((wb >>1) & 0x01) ^ (wb & 0x01));
conv_code[2*i+1] = (UINT8)(conv_code1 & 0x01);
conv_code[2*i] = (UINT8)(conv_code0 & 0x01);
}
//puncturing
pun_cir_len = (UINT16)(2 * dat_len / cc_pun);
for(i=0; i < pun_cir_len; i++) {
switch(cc_pun) {
case 2 :
dat_out[i*2] = conv_code[i*cc_pun];
dat_out[i*2 +1] = conv_code[i*cc_pun +1];
break;
case 4 :
dat_out[i*3] = conv_code[i*cc_pun];
dat_out[i*3 +1] = conv_code[i*cc_pun +1];
dat_out[i*3 +2] = conv_code[i*cc_pun +3];
break;
case 6 :
dat_out[i*4] = conv_code[i*cc_pun];
dat_out[i*4 +1] = conv_code[i*cc_pun +1];
dat_out[i*4 +2] = conv_code[i*cc_pun +3];
dat_out[i*4 +3] = conv_code[i*cc_pun +4];
break;
}
}
BitToByte
(
dat_out, //Bit
p_dat_out, //Byte
(UINT16)(dat_len*2*cc_dpun/cc_pun) //Bit length
);
if(conv_code !=NULL) {
free(conv_code);
}
if(dat_in !=NULL) {
free(dat_in);
}
if(dat_out !=NULL) {
free(dat_out);
}
return (0);
}
/*
* *************************************************************************************
* *
* CC Interleaver *
* *
* -------------------------------------------------------------------------------------
*/
/*
* *************************************************************************************
* function: dl_interleave module
* parameters:
* UINT8 *p_dat_in, // block data input (byte)
* UINT8 *p_dat_out, // block data output(CC interleave result,bit)
* UINT16 blocksize, // block size
* UINT8 rate_id
* description: CC interleave module
* Author : caolin
* -------------------------------------------------------------------------------------
*/
int dl_interleave
(
UINT8 *p_dat_in, // block data input (byte)
UINT8 *p_dat_out, // block data output(CC interleave result,bit)
UINT16 blocksize, // block size
UINT8 rate_id
)
{
UINT16 i=0;
UINT8 mod_type = 0x00;
UINT8 *dat_in = NULL;
UINT8 *dat_out = NULL;
//parameter Generate
switch(rate_id) {
case 0 :
case 1 :
mod_type = 0x02;
break;
case 2 :
case 3 :
mod_type = 0x04;
break;
case 4 :
case 5 :
case 6 :
mod_type = 0x06;
break;
default :
printf("<<<< Error: Not a valid rate_id for CC interleave(dl_interleave)! >>>>\n");
break;
}
//memory malloc
dat_in = malloc(blocksize*sizeof(UINT8));
if(dat_in == NULL) {
printf("data_in in dl_interleave module malloc fail!!\n");
return(-1);
}
dat_out = malloc(blocksize*sizeof(UINT8));
if(dat_out == NULL) {
printf("dat_out in dl_interleave module malloc fail!!\n");
return(-1);
}
ByteToBit
(
p_dat_in, //Byte
dat_in, //Bit
blocksize //Bit length
);
switch(mod_type) {
case 2 : //QPSK
switch(blocksize) {
case 96 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_QPSK_96[i]];
}
break;
case 192 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_QPSK_192[i]];
}
break;
case 288 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_QPSK_288[i]];
}
break;
case 384 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_QPSK_384[i]];
}
break;
case 480 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_QPSK_480[i]];
}
break;
case 576 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_QPSK_576[i]];
}
break;
default :
printf("ERROR: No such block size(QPSK-Intlver)!");
break;
}
break;
case 4 : //16QAM
switch(blocksize) {
case 192 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_16QAM_192[i]];
}
break;
case 384 :
for(i=0; i < blocksize; i++) {
dat_out[i] = dat_in[addint_CC_16QAM_384[i]];
}
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