Iterative demapping for QPSK modulation |
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Authors: | ten Brink S Speidel J Han R-H |
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Affiliation: | Inst. of Telecommun., Stuttgart Univ.; |
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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 |
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