ldpc_generate_coefficient.c 16 KB
Newer Older
1 2 3 4 5
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "Gen_shift_value.h"
6
#include "assertions.h"
7
#include "defs.h"
8 9 10

short *choose_generator_matrix(short BG,short Zc)
{
11
  short *Gen_shift_values = NULL;
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332

  if (BG==1)
  {
    switch (Zc)
    {
      case 2: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_2;
        break;

      case 3: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_3;
        break;

      case 4: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_4;
        break;

      case 5: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_5;
        break;

      case 6: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_6;
        break;

      case 7: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_7;
        break;

      case 8: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_8;
        break;

      case 9: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_9;
        break;

      case 10: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_10;
        break;

      case 11: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_11;
        break;

      case 12: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_12;
        break;

      case 13: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_13;
        break;

      case 14: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_14;
        break;

      case 15: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_15;
        break;

      case 16: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_16;
        break;

      case 18: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_18;
        break;

      case 20: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_20;
        break;

      case 22: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_22;
        break;

      case 24: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_24;
        break;

      case 26: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_26;
        break;

      case 28: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_28;
        break;

      case 30: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_30;
        break;

      case 32: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_32;
        break;

      case 36: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_36;
        break;

      case 40: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_40;
        break;

      case 44: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_44;
        break;

      case 48: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_48;
        break;

      case 52: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_52;
        break;

      case 56: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_56;
        break;

      case 60: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_60;
        break;

      case 64: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_64;
        break;

      case 72: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_72;
        break;

      case 80: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_80;
        break;

      case 88: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_88;
        break;

      case 96: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_96;
        break;

      case 104: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_104;
        break;

      case 112: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_112;
        break;

      case 120: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_120;
        break;

      case 128: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_128;
        break;

      case 144: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_144;
        break;

      case 160: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_160;
        break;

      case 176: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_176;
        break;

      case 192: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_192;
        break;

      case 208: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_208;
        break;

      case 224: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_224;
        break;

      case 240: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_240;
        break;

      case 256: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_256;
        break;

      case 288: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_288;
        break;

      case 320: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_320;
        break;

      case 352: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_352;
        break;

      case 384: Gen_shift_values=(short *) Gen_shift_values_BG1_Z_384;
        break;
    }
  }
  else if (BG==2)
  {
    switch (Zc)
    {
      case 2: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_2;
        break;

      case 3: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_3;
        break;

      case 4: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_4;
        break;

      case 5: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_5;
        break;

      case 6: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_6;
        break;

      case 7: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_7;
        break;

      case 8: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_8;
        break;

      case 9: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_9;
        break;

      case 10: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_10;
        break;

      case 11: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_11;
        break;

      case 12: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_12;
        break;

      case 13: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_13;
        break;

      case 14: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_14;
        break;

      case 15: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_15;
        break;

      case 16: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_16;
        break;

      case 18: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_18;
        break;

      case 20: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_20;
        break;

      case 22: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_22;
        break;

      case 24: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_24;
        break;

      case 26: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_26;
        break;

      case 28: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_28;
        break;

      case 30: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_30;
        break;

      case 32: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_32;
        break;

      case 36: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_36;
        break;

      case 40: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_40;
        break;

      case 44: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_44;
        break;

      case 48: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_48;
        break;

      case 52: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_52;
        break;

      case 56: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_56;
        break;

      case 60: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_60;
        break;

      case 64: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_64;
        break;

      case 72: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_72;
        break;

      case 80: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_80;
        break;

      case 88: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_88;
        break;

      case 96: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_96;
        break;

      case 104: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_104;
        break;

      case 112: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_112;
        break;

      case 120: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_120;
        break;

      case 128: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_128;
        break;

      case 144: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_144;
        break;

      case 160: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_160;
        break;

      case 176: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_176;
        break;

      case 192: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_192;
        break;

      case 208: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_208;
        break;

      case 224: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_224;
        break;

      case 240: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_240;
        break;

      case 256: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_256;
        break;

      case 288: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_288;
        break;

      case 320: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_320;
        break;

      case 352: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_352;
        break;

      case 384: Gen_shift_values=(short *) Gen_shift_values_BG2_Z_384;
        break;
    }
  }

  return Gen_shift_values;
}

333
int ldpc_encoder_orig(unsigned char *test_input,unsigned char *channel_input,short block_length,int nom_rate,int denom_rate,unsigned char gen_code)
334 335 336 337 338 339
{
  unsigned char c[22*384]; //padded input, unpacked, max size
  unsigned char d[68*384]; //coded output, unpacked, max size
  unsigned char channel_temp,temp;
  short *Gen_shift_values, *no_shift_values, *pointer_shift_values;
  short BG,Zc,Kb,nrows,ncols;
340
  int i,i1,i2,i3,i4,i5,temp_prime,var;
341 342 343
  int no_punctured_columns,removed_bit;
  //Table of possible lifting sizes
  short lift_size[51]= {2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,36,40,44,48,52,56,60,64,72,80,88,96,104,112,120,128,144,160,176,192,208,224,240,256,288,320,352,384};
344 345 346 347 348

  int nind=0;
  int indlist[1000];
  int indlist2[1000];

349 350
  //determine number of bits in codeword
  if (block_length>3840)
351 352 353 354 355 356
  {
    BG=1;
    Kb = 22;
    nrows=46; //parity check bits
    ncols=22; //info bits
  }
357
  else if (block_length<=3840)
358 359 360 361 362 363 364 365 366 367 368 369 370 371
  {
    BG=2;
    nrows=42;  //parity check bits
    ncols=10;  // info bits

    if (block_length>640)
      Kb = 10;
    else if (block_length>560)
      Kb = 9;
    else if (block_length>192)
      Kb = 8;
    else
      Kb = 6;
  }
372 373

  //find minimum value in all sets of lifting size
374
  Zc=0;
375 376 377 378 379 380 381 382 383
  for (i1=0; i1 < 51; i1++)
  {
    if (lift_size[i1] >= (double) block_length/Kb)
    {
      Zc = lift_size[i1];
      //printf("%d\n",Zc);
      break;
    }
  }
384 385 386 387
  if (Zc==0) {
    printf("ldpc_encoder_orig: could not determine lifting size\n");
    return(-1);
  }
388

389 390 391 392 393 394 395
  Gen_shift_values=choose_generator_matrix(BG,Zc);
  if (Gen_shift_values==NULL) {
    printf("ldpc_encoder_orig: could not find generator matrix\n");
    return(-1);
  }

  //printf("ldpc_encoder_orig: BG %d, Zc %d, Kb %d\n",BG, Zc, Kb);
396

397 398 399 400 401 402 403 404 405 406 407
  // load base graph of generator matrix
  if (BG==1)
  {
    no_shift_values=(short *) no_shift_values_BG1;
    pointer_shift_values=(short *) pointer_shift_values_BG1;
  }
  else if (BG==2)
  {
    no_shift_values=(short *) no_shift_values_BG2;
    pointer_shift_values=(short *) pointer_shift_values_BG2;
  }
408
  
409
  no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*3)/Zc;
410
  removed_bit=(nrows-no_punctured_columns-2) * Zc+block_length-(block_length*3);
411 412 413
  //printf("%d\n",no_punctured_columns);
  //printf("%d\n",removed_bit);
  // unpack input
414 415
  memset(c,0,sizeof(unsigned char) * ncols * Zc);
  memset(d,0,sizeof(unsigned char) * nrows * Zc);
416 417 418

  for (i=0; i<block_length; i++)
  {
419 420 421
    //c[i] = test_input[i/8]<<(i%8);
    //c[i]=c[i]>>7&1;
    c[i]=(test_input[i/8]&(1<<(i&7)))>>(i&7);
422 423 424 425
  }

  // parity check part

426 427 428
  if (gen_code==1)
  {
    char fname[100];
429
    sprintf(fname,"ldpc_BG%d_Zc%d_byte.c",BG,Zc);
430
    FILE *fd=fopen(fname,"w");
431 432 433 434 435
    AssertFatal(fd!=NULL,"cannot open %s\n",fname);
    sprintf(fname,"ldpc_BG%d_Zc%d_16bit.c",BG,Zc);
    FILE *fd2=fopen(fname,"w");
    AssertFatal(fd2!=NULL,"cannot open %s\n",fname);

436 437 438 439 440
    int shift;
    char data_type[100];
    char xor_command[100];
    int mask;

441 442


443 444

    fprintf(fd,"#include \"PHY/sse_intrin.h\"\n");
445
    fprintf(fd2,"#include \"PHY/sse_intrin.h\"\n");
446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462

    if ((Zc&31)==0) {
      shift=5; // AVX2 - 256-bit SIMD
      mask=31;
      strcpy(data_type,"__m256i");
      strcpy(xor_command,"_mm256_xor_si256");
    }
    else if ((Zc&15)==0) {
      shift=4; // SSE4 - 128-bit SIMD
      mask=15;
      strcpy(data_type,"__m128i");
      strcpy(xor_command,"_mm_xor_si128");

    }
    else if ((Zc&7)==0) {
      shift=3; // MMX  - 64-bit SIMD
      mask=7;
463
      strcpy(data_type,"__m64");
464 465 466 467 468 469 470 471
      strcpy(xor_command,"_mm_xor_si64"); 
    }
    else {
      shift=0;                 // no SIMD
      mask=0;
      strcpy(data_type,"uint8_t");
      strcpy(xor_command,"scalar_xor");
      fprintf(fd,"#define scalar_xor(a,b) ((a)^(b))\n");
472
      fprintf(fd2,"#define scalar_xor(a,b) ((a)^(b))\n");
473 474
    }
    fprintf(fd,"// generated code for Zc=%d, byte encoding\n",Zc);
475 476 477
    fprintf(fd2,"// generated code for Zc=%d, 16bit encoding\n",Zc);
    fprintf(fd,"static inline void ldpc_BG%d_Zc%d_byte(uint8_t *c,uint8_t *d) {\n",BG,Zc);
    fprintf(fd2,"static inline void ldpc_BG%d_Zc%d_16bit(uint16_t *c,uint16_t *d) {\n",BG,Zc);
478
    fprintf(fd,"  %s *csimd=(%s *)c,*dsimd=(%s *)d;\n\n",data_type,data_type,data_type);
479
    fprintf(fd2,"  %s *csimd=(%s *)c,*dsimd=(%s *)d;\n\n",data_type,data_type,data_type);
480
    fprintf(fd,"  %s *c2,*d2;\n\n",data_type);
481
    fprintf(fd2,"  %s *c2,*d2;\n\n",data_type);
482
    fprintf(fd,"  int i2;\n");
483
    fprintf(fd2,"  int i2;\n");
484
    fprintf(fd,"  for (i2=0; i2<%d; i2++) {\n",Zc>>shift);
485
    fprintf(fd2,"  for (i2=0; i2<%d; i2++) {\n",Zc>>(shift-1));
486 487
    for (i2=0; i2 < 1; i2++)
    {
488 489
      //t=Kb*Zc+i2;
    
490
      // calculate each row in base graph
491 492
     

493 494
      fprintf(fd,"     c2=&csimd[i2];\n");
      fprintf(fd,"     d2=&dsimd[i2];\n");
495 496
      fprintf(fd2,"     c2=&csimd[i2];\n");
      fprintf(fd2,"     d2=&dsimd[i2];\n");
497

498
      for (i1=0; i1 < nrows; i1++)
499 500 501 502

      {
        channel_temp=0;
        fprintf(fd,"\n//row: %d\n",i1);
503
        fprintf(fd2,"\n//row: %d\n",i1);
504
	fprintf(fd,"     d2[%d]=",(Zc*i1)>>shift);
505
	fprintf(fd2,"     d2[%d]=",(Zc*i1)>>(shift-1));
506 507 508

        nind=0;

509
        for (i3=0; i3 < ncols; i3++)
510 511 512
        {
          temp_prime=i1 * ncols + i3;

513

514 515 516 517 518 519
	  for (i4=0; i4 < no_shift_values[temp_prime]; i4++)
	    {
	          
	      var=(int)((i3*Zc + (Gen_shift_values[ pointer_shift_values[temp_prime]+i4 ]+1)%Zc)/Zc);
	      int index =var*2*Zc + (i3*Zc + (Gen_shift_values[ pointer_shift_values[temp_prime]+i4 ]+1)%Zc) % Zc;
	      
520 521
	      indlist[nind] = ((index&mask)*((2*Zc)>>shift)*Kb)+(index>>shift);
	      indlist2[nind++] = ((index&(mask>>1))*((2*Zc)>>(shift-1))*Kb)+(index>>(shift-1));
522 523 524 525 526 527 528
	      
	    }
	  

        }
	for (i4=0;i4<nind-1;i4++) {
	  fprintf(fd,"%s(c2[%d],",xor_command,indlist[i4]);
529
	  fprintf(fd2,"%s(c2[%d],",xor_command,indlist2[i4]);
530 531
	}
	fprintf(fd,"c2[%d]",indlist[i4]);
532 533
	fprintf(fd2,"c2[%d]",indlist2[i4]);
	for (i4=0;i4<nind-1;i4++) { fprintf(fd,")"); fprintf(fd2,")"); }
534
	fprintf(fd,";\n");
535 536
	fprintf(fd2,";\n");

537 538
      }
      fprintf(fd,"  }\n}\n");
539
      fprintf(fd2,"  }\n}\n");
540 541
    }
    fclose(fd);
542
    fclose(fd2);
543 544
  }
  else if(gen_code==0)
545
  {
546
    for (i2=0; i2 < Zc; i2++)
547
    {
548
      //t=Kb*Zc+i2;
549

550 551 552 553 554 555
      //rotate matrix here
      for (i5=0; i5 < Kb; i5++)
      {
        temp = c[i5*Zc];
        memmove(&c[i5*Zc], &c[i5*Zc+1], (Zc-1)*sizeof(unsigned char));
        c[i5*Zc+Zc-1] = temp;
556
      }
557 558 559

      // calculate each row in base graph
      for (i1=0; i1 < nrows-no_punctured_columns; i1++)
560
      {
561
        channel_temp=0;
562

563
        for (i3=0; i3 < Kb; i3++)
564
        {
565 566 567 568 569 570
          temp_prime=i1 * ncols + i3;

          for (i4=0; i4 < no_shift_values[temp_prime]; i4++)
          {
            channel_temp = channel_temp ^ c[ i3*Zc + Gen_shift_values[ pointer_shift_values[temp_prime]+i4 ] ];
          }
571
        }
572 573 574

        d[i2+i1*Zc]=channel_temp;
        //channel_input[t+i1*Zc]=channel_temp;
575 576 577 578 579 580
      }
    }
  }

  // information part and puncture columns
  memcpy(&channel_input[0], &c[2*Zc], (block_length-2*Zc)*sizeof(unsigned char));
581
  memcpy(&channel_input[block_length-2*Zc], &d[0], ((nrows-no_punctured_columns) * Zc-removed_bit)*sizeof(unsigned char));
582 583 584
  //memcpy(channel_input,c,Kb*Zc*sizeof(unsigned char));
  return 0;
}