Title :
Compression of redundancy free trellis stages in turbo-decoder
Author :
Boutillon, E. ; SaÌnchez-Rojas, J. ; Marchand, Claude
Author_Institution :
Lab.-STICC, Univ. de Bretagne Sud, Lorient, France
Abstract :
For turbo codes with a coding rate close to one, the high puncturing rate induces long sequences of trellis without a redundancy bit. A simplification technique to compute the final state of a sequence of redundancy free trellis stages (RFTSs) is presented. It compresses a sequence of RFTSs of length N into a sequence of RFTSs of length m - 1 + (N mod (m - 1)), where m is the number of states of the trellis. The computation is reduced accordingly.
Keywords :
data compression; decoding; trellis codes; turbo codes; RFTS; coding rate; puncturing rate; redundancy free trellis stage sequence; sequence compression; simplification technique; turbo-decoder;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.4433