Title :
Iterative decoding in convolutionally and turbo coded MFSK/FH-SSMA systems
Author :
Park, Daeyoung ; Lee, Byeong Gi
Author_Institution :
Dept. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
This paper presents an iterative decoding method in the coded MFSK (multilevel frequency shift keying)/FH-SSMA (frequency hopping-spread spectrum multiple access) system. The kernel of the system, which is a symbol APP (a posteriori probability) calculator, accepts channel values and a priori information from the channel decoder and generates reliability values of the received symbols. The channel decoder also makes reliability outputs using the reliability values from the symbol APP calculator. Iterative decoding is performed by repeating this process. Simulation results reveal that the channel coded system with iterative decoding in the FH-SSMA system can reduce the BER significantly, thereby accommodating more users
Keywords :
channel coding; concatenated codes; convolutional codes; error statistics; frequency hop communication; frequency shift keying; iterative decoding; multi-access systems; multiuser channels; spread spectrum communication; turbo codes; BER reduction; a posteriori probability; channel code; channel decoder; concatenated code; convolutionally coded MFSK/FH-SSMA systems; frequency hopping-spread spectrum multiple access; iterative decoding; multilevel frequency shift keying; received symbols reliability; simulation results; symbol APP; symbol APP calculator; system kernel; turbo coded MFSK/FH-SSMA systems; Convolution; Convolutional codes; Fading; Filter bank; Frequency shift keying; Frequency synthesizers; Iterative decoding; Time frequency analysis; Transmitters; Turbo codes;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936657
