error correcting codes/ Forward Error correction

shamsuddeen2004
Mind Map by shamsuddeen2004, updated more than 1 year ago
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Mind Map on error correcting codes/ Forward Error correction, created by shamsuddeen2004 on 04/28/2013.
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error correcting codes/ Forward Error correction
1 convolutinal code
1.1 block by block basis
1.1.1 BASIC : Repetion code , Hammin Code , Multi- dimentioanlal parity check code, repition code ,parity codes ,reed solomoon codes ,cyclic codes (e.g ha)
1.1.2 More -Efficient : Reed Solomon Code ,Turbo Codes, LDP.The last two provide almost optimal efficiency
1.2 Decoded with Viterbi
2 block codes
2.1 biy-by-bit basis
3 ERRO CORRECTIONN
3.1 ARQ
3.1.1 STOP -AND-WAIT ARQ
3.1.2 GO BACK-N ARQ
3.1.3 SELECTIVE REPEAT ARQ
3.2 HYBRID ARQ
3.2.1 Messages are always transmitted with FEC parity data (and error-detection redundancy) A receiver decodes a message using the parity information, and.
3.2.2 Messages are always transmitted with OUT FEC parity data (and error-detection redundancy ). f a receiver detects an error, it requests FEC informatio
3.2.3 hybrid ARQ with soft combining : In practice, incorrectly received coded data blocks are often stored at the receiver rather than discarded, and when
3.2.3.1 Chase Combining: every retransmission contains the same information (data and parity bits). The receiver uses maximum-ratio combining to combine the r
3.2.3.1.1 Type 1 HARQ with MCR is called Chase combing
3.2.3.2 Incremental Redundancy :every retransmission contains different information than the previous one. Multiple sets of coded bits are generated, each rep
3.2.3.2.1 Type 2 n the type-II HARQ scheme [23], [24], instead of sending the same coded packets, the transmitter tries to construct and send additional coded p
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