FFH-CDMA系统中q-ary积turbo码的迭代解码

2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI:10.1109/SPAWC.2008.4641582

V.V. do Nascimento, J. Portugheis, D.C. da Cunha

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引用次数: 2

摘要

本文研究了q-ary积turbo码在FFH-CDMA系统中的应用。提出了一种实现q元软译码的方法。首先，提出了一种自适应的Chase译码算法，以满足q-ary符号的要求。与二进制算法相比，自适应并没有显著增加解码复杂度。其次，对迭代(turbo)译码的改进允许在每次译码迭代中对译码后的q元符号及其可靠性进行适当的反馈。仿真结果表明，与之前提出的其他系统相比，q-ary turbo编码系统具有良好的性能和复杂性权衡。

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

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.

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

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