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A top-down SCMA codebook design scheme based on lattice theory

机译：基于晶格理论的自上而下的SCMA码本设计方案

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Recent work on multiple access has shown sparse code multiple access (SCMA) is a promising scheme dealing with massive connection. In SCMA systems, symbol spreading is combined with symbol mapping. The coded bits are directly mapped to the spread symbols, called codewords, according to SCMA codebook. Several codewords are superposed on the same resource. Since codebook is essential to SCMA system performance, this paper aims to present a novel top-down codebook design scheme for SCMA. Firstly, a geometrically uniform top-layer mother constellation with good energy efficiency is proposed based on lattice theory. After dividing the top layer constellation into several bottom layer constellations, we use matrix operation to optimize their distance spectrums. Then a mapping principle between users and resource is proposed to construct the final codewords. Simulation results shows that this top-down codebook outperforms existing schemes in bit error ratio (BER) while sharply reduce the peak to average power ratio (PAPR).
机译：最近在多路访问方面的工作表明，稀疏代码多路访问（SCMA）是一种处理大规模连接的有前途的方案。在SCMA系统中，符号扩展与符号映射结合在一起。根据SCMA码本，编码后的位直接映射到扩展码元，称为码字。几个代码字叠加在同一资源上。由于码本对于SCMA系统的性能至关重要，因此本文旨在提出一种新颖的自顶向下的码本SCMA设计方案。首先，基于晶格理论，提出了一种具有良好能量效率的几何均匀的顶层母星座。将顶层星座划分为几个底层星座后，我们使用矩阵运算来优化其距离谱。然后提出了用户与资源之间的映射原理，以构造最终的码字。仿真结果表明，该自上而下的码本在误码率（BER）方面优于现有方案，同时大大降低了峰均功率比（PAPR）。

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