A multilevel coded modulation approach for hexagonal signal constellation
A multilevel coded modulation approach for hexagonal signal constellation
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DOI：
10.1109/twc.2009.090103
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发表时间：
2009-10
影响因子：
10.4
通讯作者：
M. Tanahashi;H. Ochiai
中科院分区：
文献类型：
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作者：
M. Tanahashi;H. Ochiai
我们提出了一种称为六角形壳调制（HSM）的新编码调制。 HSM的信号星座由六角形的壳样瓷砖组成，因此峰值与平均功率比（PAR）低于标准的正方形正交振幅调制（QAM），具有可比的带宽效率和最小的欧几里得距离。主要的挑战是HSM具有未达到的星座点，因此将二进制信息分配给HSM并不直接。我们通过应用多级编码调制（MLC）方案来解决此问题，其中使用二进制输入三元输出（BITO）涡轮代码的三元组设置分区来充分利用非功率-TWO恒星点的属性。在整个信中，我们专注于18个ARY HSM，其信息率为3位/符号作为特定示例。结果表明，当PAR受到限制时，该系统以相同的速率优于标准正方形16-QAM。
We propose a new coded modulation called hexagonal shell modulation (HSM). The HSM has a signal constellation composed of shell-like tiling of hexagons and thus has a lower peak-to-average power ratio (PAR) than a standard square quadrature amplitude modulation (QAM) with comparable bandwidth efficiency and minimum Euclidean distance. The main challenge is that HSM has a non-power-of-two number of constellation points, and thus assignment of binary information to HSM is not straightforward. We resolve this by applying a multilevel coded modulation (MLC) scheme where a ternary set partitioning combined with binary-input ternary-output (BITO) turbo codes is employed to fully exploit the property of the nonpower- of-two constellation points. Throughout this letter, we focus on an 18-ary HSM with the information rate of 3 bit/symbol as a specific example. It is shown that this system outperforms the standard square 16-QAM with the same rate when PAR is constrained.