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Block Turbo Decoder Design

Block Turbo Decoder Design. Hu Dongwei. Error Correcting Codes. Classic Block Codes BCH RS RM Convolutional Codes (Viterbi)

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Block Turbo Decoder Design

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  1. Block Turbo Decoder Design Hu Dongwei

  2. Error Correcting Codes • Classic Block Codes BCH RS RM • Convolutional Codes (Viterbi) • Turbo Codes Parallel Concatenated Convolutional Codes Serial Concatenated Block Codes

  3. Block Turbo Coding

  4. ML decoding 即寻找一个与接收信号R有最小欧氏距离的码字。

  5. Problems of MLDecoding 可能的码字个数：２６＊２６＝６７６ 需计算这么多欧氏距离，计算量太大

  6. Chase Algorithm Hard Decided Sequence: Reliability: Step 1: find p least reliable positions.

  7. Chase Algorithm Step 2:generate test patterns: Step 3: decode the test patterns and form the code set C Step 4: find the minimum distance code D.

  8. Log likelyhood

  9. Max-logMAP

  10. Soft Output Computing the soft output corresponding to the jth bit: In the decoded set C, if we can find a code word that complements with D at the jth bit position and has minimum distance with R

  11. Soft output • If we can not find such a word in C,

  12. Extrinsic information

  13. Iterative decoding Column --- row --- column ----- row ----- column …..

  14. Performance

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