论文标题
使用块代码和平方构造的基于媒体调制的星座设计
Constellation Design for Media-based Modulation using Block Codes and Squaring Construction
论文作者
论文摘要
高效的星座设计对于改善通信系统的性能很重要。在多维编码调制和时空编码的MIMO系统的背景下，在文献中对多维星座设计的问题进行了广泛的研究。此类星座正式称为晶格代码，其中根据某些标准选择了从某个高维晶格的有限点。在本文中，我们考虑了基于媒体调制（MBM）的星座/信号集设计的问题，这是一种最新的MIMO频道调制方案，具有有希望的理论和实际好处。 MBM的星座设计与多维编码调制和常规MIMO系统的星座设计主要是因为MBM信号向量的固有稀疏结构。具体而言，我们需要具有良好距离属性的结构化稀疏晶格代码。在这项工作中，我们表明，使用（N，K）非二进制块代码与基于晶格的多级平方结构结合使用，可以系统地为MBM系统构建具有某些保证最小距离的MBM信号。与常规MBM信号集相比，使用拟议的构造获得的MBM信号集已显示出可显着改善的位误差性能。特别是，发现所提出的信号集可以在低至中度的SNR方向上实现更高的多样性斜率。
Efficient constellation design is important for improving performance in communication systems. The problem of multidimensional constellation design has been studied extensively in the literature in the context of multidimensional coded modulation and space-time coded MIMO systems. Such constellations are formally called as lattice codes, where a finite set of points from a certain high dimensional lattice is chosen based on some criteria. In this paper, we consider the problem of constellation/signal set design for media-based modulation (MBM), a recent MIMO channel modulation scheme with promising theoretical and practical benefits. Constellation design for MBM is fundamentally different from those for multidimensional coded modulation and conventional MIMO systems mainly because of the inherent sparse structure of the MBM signal vectors. Specifically, we need a structured sparse lattice code with good distance properties. In this work, we show that using an (N,K) non-binary block code in conjunction with the lattice based multilevel squaring construction, it is possible to systematically construct a signal set for MBM with certain guaranteed minimum distance. The MBM signal set obtained using the proposed construction is shown to achieve significantly improved bit error performance compared to conventional MBM signal set. In particular, the proposed signal set is found to achieve higher diversity slopes in the low-to-moderate SNR regime.
