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Iterative decoding of q-ary product turbo codes in FFH-CDMA systems

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3 Author(s)
Vagner Vale do Nascimento ; State University of Campinas, School of Electrical and Computer Engineering, São Paulo, Brazil ; Jaime Portugheis ; Daniel Carvalho da Cunha

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.

Published in:

2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications

Date of Conference:

6-9 July 2008