Title :
Comprehensive comparison of turbo-code decoders
Author :
Jung, Peter ; Nasshan, M.M.
Author_Institution :
Res. Group for RF Commun., Kaiserslautern Univ., Germany
Abstract :
The decoding of turbo-codes (a novel class of binary parallel concatenated recursive systematic convolutional codes) relies on the application of soft input/soft output decoders. Such decoders can be realized either using maximum-a-posteriori (MAP) symbol estimators or MAP sequence estimators, e.g. the a-priori soft output Viterbi algorithm (APRI-SOVA). The structure of turbo-codes encoders as well as decoders is described. In particular, four different decoder structures suitable for decoding turbo-codes are illustratively described and their error rate performance capabilites compared in both AWGN as well as flat Rayleigh fading channels based on extensive simulation results
Keywords :
Gaussian channels; Rayleigh channels; concatenated codes; convolutional codes; decoding; estimation theory; fading; maximum likelihood estimation; APRI-SOVA; AWGN channels; MAP sequence estimators; MAP symbol estimators; apriori soft output Viterbi algorithm; binary parallel concatenated codes; decoder structures; decoding; error rate performance; flat Rayleigh fading channels; maximum aposteriori symbol estimators; recursive systematic convolutional codes; simulation results; soft input/soft output decoders; turbo-code decoders; turbo-codes encoders; Decoding; Delay; Distributed control; GSM; Land mobile radio; Signal processing; Speech; Time division multiple access; Turbo codes; Viterbi algorithm;
Conference_Titel :
Vehicular Technology Conference, 1995 IEEE 45th
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-2742-X
DOI :
10.1109/VETEC.1995.504943
