III. Turbo Codes

Forward Recursive Equation Backward Recursive Equation Summary MAP Algorithm Forward Recursive Equation Backward Recursive Equation

Iterative Decoding Principles Note that

Iterative Decoding Principles

Iterative Decoding Principles

Iterative Decoding Principles Define

Iterative Decoding Principles

Iterative Decoding Principles Le12 is called the extrinsic information generated by the first decoder for the second decoder

Iterative Decoding Principles For the second decoder L1a N-bit De-Inter. L1[u|y] L2[u|y] L2a L12e MAP Decoder 1 N-bit Interleaver MAP Decoder 2 L21e y1p - - ys Lc x x Lc N-bit Interleaver N-bit De-Inter. u* y2p

Performance of Iterative Decoding

Performance of Iterative Decoding