INVESTIGADORES
CASTIÑEIRA MOREIRA Jorge
congresos y reuniones científicas
Título:
EXIT CHART ANALYSIS OF NON-SYSTEMATIC TURBO CODING
Autor/es:
LIBERATORI, M. C.; BONADERO, J. C.; PETRUZZI, D. M.; CASTIÑEIRA MOREIRA, J.
Lugar:
Santa Fe
Reunión:
Congreso; AST 37 JAIIO; 2008
Institución organizadora:
JAIIO
Resumen:
This paper presents non-punctured non-systematic ½-rate turbo codes designed using Finite State Sequence Machines (FSSMs) that operate over the Finite Field GF(4). The main characteristic of these turbo codes is that they do not show convergence problems in their iterative decoding, as it happens to similar schemes defined over the binary Field. A relationship is found between the state transitions structure of the FSSM and the BER performance (or equivalently the form of the Extrinsic Information Transfer (EXIT) chart) of the turbo code constructed using that FSSM. FSSMs defined over GF(4) with all-zero input responses of the form of long closed cycles are the best options as constituent encoders of non-punctured non-systematic ½-rate turbo codes. A parameter called the normalized cycle Hamming distance is defined for characterizing the trellis structure of a given FSSM. The best schemes show also the largest values of this parameter.