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59643
error correcting codes/ Forward Error correction
Description
Mind Map on error correcting codes/ Forward Error correction, created by shamsuddeen2004 on 28/04/2013.
Mind Map by
shamsuddeen2004
, updated more than 1 year ago
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Created by
shamsuddeen2004
almost 11 years ago
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Resource summary
error correcting codes/ Forward Error correction
convolutinal code
block by block basis
BASIC : Repetion code , Hammin Code , Multi- dimentioanlal parity check code, repition code ,parity codes ,reed solomoon codes ,cyclic codes (e.g ha)
More -Efficient : Reed Solomon Code ,Turbo Codes, LDP.The last two provide almost optimal efficiency
Decoded with Viterbi
block codes
biy-by-bit basis
ERRO CORRECTIONN
ARQ
STOP -AND-WAIT ARQ
GO BACK-N ARQ
SELECTIVE REPEAT ARQ
HYBRID ARQ
Messages are always transmitted with FEC parity data (and error-detection redundancy) A receiver decodes a message using the parity information, and.
Messages are always transmitted with OUT FEC parity data (and error-detection redundancy ). f a receiver detects an error, it requests FEC informatio
hybrid ARQ with soft combining : In practice, incorrectly received coded data blocks are often stored at the receiver rather than discarded, and when
Chase Combining: every retransmission contains the same information (data and parity bits). The receiver uses maximum-ratio combining to combine the r
Type 1 HARQ with MCR is called Chase combing
Incremental Redundancy :every retransmission contains different information than the previous one. Multiple sets of coded bits are generated, each rep
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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