Arc Hyperbolic Tangent representation scheme for APP decoders working on the dual code
Conference: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
04/03/2006 - 04/07/2006 at Munich, Germany
Proceedings: TURBO - CODING - 2006
Pages: 6Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Srinivasan, Sudharshan; Pietrobon, Steven S. (Institute for Telecommunications Research, University of South Australia, Mawson Lakes SA 5095, Australia)
Pietrobon, Steven S. (Small World Communications, 6 First Avenue, Payneham South SA 5070, Australia)
An a posteriori probability (APP) decoder working on the trellis of the dual code is preferred if the code rate is high. However, the nature of the metrics in a dual-APP decoder makes a hardware realisation quite complex, due to very fine quantisation requirements. This paper points out the problem associated with a traditional log domain approach and proposes a new metric representation scheme. The arithmetic operations involved in a trellis based implementation are discussed and simulation results for a turbo code are given.