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III. Turbo Codes

III. Turbo Codes. An Example of MAP Algorithm. -1-1. -1-1. -1-1. -1-1. -1-1. s 0 (0 0). 11. 11. 11. 11. 11. 11. s 1 (1 0). -1-1. 1-1. 1-1. 1-1. s 2 (0 1). -1 1. -1 1. -1 1. -1 1. s 3 (1 1). 1-1.

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III. Turbo Codes

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  1. III. Turbo Codes

  2. An Example of MAP Algorithm -1-1 -1-1 -1-1 -1-1 -1-1 s0 (0 0) 11 11 11 11 11 11 s1 (1 0) -1-1 1-1 1-1 1-1 s2 (0 1) -1 1 -1 1 -1 1 -1 1 s3 (1 1) 1-1 Note: The decoding in this example is done after 5 transitions over the trellis. The paths drawn on the trellis are the paths that starts at state s0 and end at state s0

  3. An Example of MAP Algorithm Assume equi-probable bits, σ2=1

  4. An Example of MAP Algorithm Assume equi-probable bits, σ2=1

  5. An Example of MAP Algorithm Assume equi-probable bits, σ2=1

  6. An Example of MAP Algorithm Assume equi-probable bits, σ2=1

  7. An Example of MAP Algorithm Assume equi-probable bits, σ2=1

  8. An Example of MAP Algorithm The trellis starts at s0

  9. An Example of MAP Algorithm

  10. An Example of MAP Algorithm

  11. An Example of MAP Algorithm Note: is not used in computations

  12. An Example of MAP Algorithm The trellis ends at s0

  13. An Example of MAP Algorithm The trellis ends at s0

  14. An Example of MAP Algorithm

  15. An Example of MAP Algorithm Note: is not used in computations

  16. An Example of MAP Algorithm

  17. An Example of MAP Algorithm

  18. An Example of MAP Algorithm

  19. An Example of MAP Algorithm

  20. An Example of MAP Algorithm

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