Title :
Iterative decoding of q-ary product turbo codes in FFH-CDMA systems
Author :
Nascimento, Vagner Vale do ; Portugheis, Jaime ; Cunha, Daniel Carvalho da
Author_Institution :
Sch. of Electr. & Comput. Eng., State Univ. of Campinas, Campinas
Abstract :
This paper presents a study about q-ary product turbo codes applied to FFH-CDMA systems. A method to implement the q-ary soft decoding is proposed. First, an adaptation of Chase decoding algorithm to satisfy q-ary symbols requirements is developed. The adaptation does not significantly increase decoding complexity when compared to the binary algorithm. Second, a modification of iterative (turbo) decoding allows appropriate feedback of decoded q-ary symbols and their reliabilities in each decoder iteration. Simulation results indicate a good performance/complexity trade-off of the q-ary turbo coded system when compared to other previous proposed systems.
Keywords :
code division multiple access; computational complexity; iterative decoding; product codes; turbo codes; Chase decoding algorithm; FFH-CDMA system; binary algorithm; decoding complexity; g-ary soft decoding; iterative decoding; q-ary product turbo codes; AWGN; Channel capacity; Detectors; Fading; Feedback; Frequency conversion; Iterative algorithms; Iterative decoding; Turbo codes; Viterbi algorithm;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2008. SPAWC 2008. IEEE 9th Workshop on
Conference_Location :
Recife
Print_ISBN :
978-1-4244-2045-2
Electronic_ISBN :
978-1-4244-2046-9
DOI :
10.1109/SPAWC.2008.4641582
