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arXiv 1306.4009cs.ITmath.IT
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编码调制比特译码器的渐近性能

On the Asymptotic Performance of Bit-Wise Decoders for Coded Modulation

Mikhail Ivanov, Alex Alvarado, Fredrik Brannstrom, Erik Agrell

摘要:

研究了高斯平坦衰落信道下编码调制的两种译码器结构:最大似然码元译码器和基于比特交织编码调制范式的(次优)比特译码器。我们考虑一个16进制正交幅度星座标记的灰色标签。它示出的成对错误概率方面的渐近损失,对于任何两个码字所造成的逐位解码器,是有界的1.25 dB。分析还表明,对于高斯信道的渐近损失是零的线性码,包括所有的速率1/2卷积码的范围很广。

英文摘要:

Two decoder structures for coded modulation over the Gaussian and flat fading channels are studied: the maximum likelihood symbol-wise decoder, and the (suboptimal) bit-wise decoder based on the bit-interleaved coded modulation paradigm. We consider a 16-ary quadrature amplitude constellation labeled by a Gray labeling. It is shown that the asymptotic loss in terms of pairwise error probability, for any two codewords caused by the bit-wise decoder, is bounded by 1.25 dB. The analysis also shows that for the Gaussian channel the asymptotic loss is zero for a wide range of linear codes, including all rate-1/2 convolutional codes.

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