Journal ArticleDOI
Iterative demapping for QPSK modulation
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TLDR
In this paper, an iterative decoding scheme for quadrature phase shift keying (QPSK) modulation with anti-gray mapping is presented, where a soft demapper accepting a priori information and a convolutional decoder are applied in a serial concatenation.Abstract:
The authors present an iterative decoding scheme which is particularly suited for quadrature phase shift keying (QPSK) modulation with anti-Gray mapping. At the receiver, a soft demapper accepting a priori information and a convolutional decoder are applied in a serial concatenation. Numerical results are presented for QPSK in additive white Gaussian noise and Rayleigh-fading channels. The iterated system applying anti-Gray mapping outperforms the conventional system using Gray mapping after only one iteration.read more
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Bit-interleaved coded modulation
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References
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Proceedings ArticleDOI
Near Shannon limit error-correcting coding and decoding: Turbo-codes. 1
TL;DR: In this article, a new class of convolutional codes called turbo-codes, whose performances in terms of bit error rate (BER) are close to the Shannon limit, is discussed.
Proceedings ArticleDOI
A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain
TL;DR: A log- MAP algorithm is presented that avoids the approximations in the max-log-MAP algorithm and hence is equivalent to the true MAP, but without its major disadvantages, and it is concluded that the three algorithms increase in complexity in the order of their optimality.
Journal ArticleDOI
Iterative correction of intersymbol interference: Turbo‐equalization
Catherine Douillard,Michel Jezequel,Claude Berrou,Département Electronique,Annie Picart,Pierre Didier,Alain Glavieux +6 more
TL;DR: The results obtained show that turbo-equalization manages to overcome multipath effects, totally on Gauss channels, and partially but still satisfactorily on Rayleigh channels.