Lattice coding for MIMO systems in impulse noise
Lattice coding for MIMO systems in impulse noise
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DOI：
10.1109/icumt.2017.8255182
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
Khodr A. Saaifan;N. Islam;W. Henkel
中科院分区：
文献类型：
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作者：
Khodr A. Saaifan;N. Islam;W. Henkel
在本文中，我们研究了格码的信号空间分集（SSD），以减轻无线MIMO系统中的脉冲噪声的影响。Middleton Class-A（MCA）模型是叠加到加性白色高斯噪声（AWGN）上的脉冲干扰的最被接受的模型之一。为了证明SSD的罗利衰落和脉冲噪声，我们评估的成对错误概率（PEP）的最佳格解码下完美的知识的噪声状态。然而，由于脉冲噪声的空间耦合，MCA模型的MIMO系统的扩展导致相关的多变量分布。为了保持格型编码在MIMO系统中的全分集优势，研究了在瑞利衰落和相关脉冲噪声环境下格型空时编码的对角设计。我们还利用MIMO信道的零空间，使用一个简单的阈值检测器来提取噪声状态。我们表明，最佳格ST解码器可以实现由噪声白化变换，然后由一个传统的球解码器。最后，我们评估了最佳格ST解码的PEP，这表明脉冲噪声耦合如何限制SSD的性能改善相对于接收天线的数量。
In this paper, we investigate signal space diversity (SSD) of lattice codes to mitigate the effect of impulse noise in wireless MIMO systems. A Middleton Class-A (MCA) model is one of the most accepted models for impulsive interference superimposed to additive white Gaussian noise (AWGN). To prove SSD for both Raleigh fading and impulse noise, we evaluate the pairwise-error probability (PEP) of optimum lattice decoding under perfect knowledge of noise states. However, due to the spatial coupling of impulse noise, the extension of the MCA model to MIMO systems leads to a correlated multivariate distribution. To maintain the full diversity advantages of lattice coding in MIMO systems, we investigate a diagonal design of lattice space-time (ST) coding for Rayleigh fading and correlated impulse noise. We also utilize a null space of the MIMO channel to extract noise states using a simple threshold detector. We show that the optimum lattice ST decoder can be realized by a noise-whitening transformation followed by a conventional sphere decoder. Finally, we evaluate the PEP of the optimum lattice ST decoding, which shows how impulse noise coupling limits the performance improvements of SSD with respect to the number of receive antennas.