Map algorithm - PowerPoint PPT Presentation

MAP decoding: The BCJR algorithm

MAP decoding: The BCJR algorithm. Maximum A posteriori Probability Bahl-Cocke-Jelinek-Raviv (1974) Baum-Welch algorithm (1963?)* Decoder inputs: Received sequence r (soft or hard) A priori L-values L a ( u l ) = ln( P ( u l =1)/ P ( u l =0) ) Decoder outputs

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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

III. Turbo Codes. 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.

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