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Coplanar Turbo-FSK: A Flexible and Power Efficient Modulation for the Internet-of-Things

机译：COPLANAR TURBO-FSK：对互联网的灵活和功率有效调制

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摘要

As the Internet-of-Things (IoT) has expanded, multiple solutions have attempted to address the issues of the Low Power Wide Area (LPWA) networks physical layer. In a previous work, we proposed the Turbo-FSK, a constant envelope modulation with orthogonal alphabet that allows the receiver to operate at very low levels of power (high sensitivity performance) and very low levels of energy per bit Eb. The scheme was demonstrated to approach Shannon's limit as close as 0.29 dB. However, the scheme lacks flexibility in terms of spectral efficiency (always lower than 10~(-1)) bits/s/Hz), especially compared to the recently standardized Narrow-Band IoT (NB-IoT) solution. In this work, we propose an evolution of the initial scheme, so-called Coplanar Turbo-FSK (C-TFSK). In order to increase the spectral efficiency of the system, two new features are introduced: a modulation combining linear and orthogonal properties where only subsets of the alphabet are orthogonal and a puncturing mechanism. Several aspects of the scheme are then studied under asymptotic hypothesis, such as the influence of the linear component of the alphabet and the effects of puncturing. The high flexibility in terms of spectral efficiency, the short distance to Shannon's limit, and the constant envelope property make the C-TFSK a serious contender for the physical layer of the IoT.
机译：随着物联网（IoT）的发展，多种解决方案试图解决低功耗广域（LPWA）网络物理层的问题。在之前的工作中，我们提出了Turbo-FSK，这是一种具有正交字母表的恒定包络调制，允许接收机在非常低的功率水平（高灵敏度性能）和非常低的每比特能量水平下工作。该方案被证明接近香农极限，接近0.29 dB。然而，与最近标准化的窄带IoT（NB-IoT）解决方案相比，该方案在频谱效率（总是低于10-1）比特/秒/赫兹）方面缺乏灵活性。在这项工作中，我们提出了初始方案的一种改进，即所谓的共面Turbo FSK（C-TFSK）。为了提高系统的频谱效率，引入了两个新特性：结合线性和正交特性的调制（其中只有字母表的子集是正交的）和穿孔机制。然后在渐近假设下研究了该方案的几个方面，如字母表线性分量的影响和穿孔的影响。在频谱效率方面的高灵活性、到香农极限的短距离以及恒定的包络特性使C-TFSK成为物联网物理层的有力竞争者。

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