Iterative decoding of q-ary turbo-product codes in FFH-CDMA systems / Decodificação iterativa de codigos turbo-produto q-arios em um Canal FFH-CDMA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This work presents a study of q-ary turbo decoding applied to FFH-CDMA systems. To attain the main objective of this dissertation, an algorithm to implement the q-ary soft decoding was designed. Specifically, an adaptation of the Chase decoding method was proposed to comply with q-ary symbols requirements. The proposal of iterative (turbo) decoding makes possible the feedback of the decoded q-ary symbols and its reliabilities in each decoder iteration. Simulations were done considering Gaussian and FFH-CDMA channels. The results obtained in the simulations indicate a better system s performance when the q-ary turbo decoding is applied, without compromising complexity. However, the use of product codes decreases the system s spectral efficiency. Thus, it is necessary to increase the q-ary code s alphabet in order to mitigate this decréase. Keywords: Non-Binary Codes, Product Codes, Soft Decoding, Turbo Decoding, SISO, FFH-CDMA

ASSUNTO(S)

coding theory teoria da codificação

ACESSO AO ARTIGO

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