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arXiv 2407.00481eess.SP
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机器类通信波形:新维度的探索

Machine-Type Communication Waveforms: An Exploration of New Dimensions

Michael Wang, Lei Wang, Xiaohu You

AI总结:

本文提出一类广义MTC波形,揭示FSK和LoRa仅为其子集,并发现新波形维度作为额外自由度,以低复杂度实现能量与资源效率及鲁棒性的优化。

摘要:

本文推导了一类广义波形,并将其应用于机器类通信(MTC),同时研究了其相对于传统调制波形的底层结构特性。首先,确定了一种频率误差容限的规范波形,用于统一前导码和业务信号设计,非常适合作为复合波形(通常称为传输突发)用于MTC。研究表明,用于大规模物联网(mIoT)业务信号的最广泛使用的调制方案,例如FSK和LoRa调制,仅仅是该规范波形的子集。然后探索了该波形提供的固有特性和自由度。最重要的是,发现并利用了一个新的波形维度,作为满足MTC需求(即能量和资源效率以及鲁棒性)的额外自由度。在AWGN、频率平坦和频率选择性信道中,通过分析和数值方法评估了相应的益处。我们证明,FSK和LoRa都无法完全满足mIoT需求,因为从广义波形类的角度来看,两者都没有充分利用自由度。最后,设计了一种解决方案,在各种部署环境和实际约束下优化能量和资源效率,同时保持低复杂度特性。

英文摘要:

This paper derives a generalized class of waveforms with an application to machine-type communication (MTC) while studying its underlying structural characteristics in relation to conventional modulation waveforms. First, a canonical waveform of frequency-error tolerance is identified for a unified preamble and traffic signal design, ideal for MTC use as a composite waveform, commonly known as a transmission burst. It is shown that the most widely used modulation schemes for mIoT traffic signals, e.g., FSK and LoRa modulation, are simply subsets of the canonical waveform. The intrinsic characteristics and degrees of freedom the waveform offers are then explored. Most significantly, a new waveform dimension is uncovered and exploited as additional degrees of freedom for satisfying the MTC requirements, i.e., energy and resource efficiency and robustness. The corresponding benefits are evaluated analytically and numerically in AWGN, frequency-flat, and selective channels. We demonstrate that neither FSK nor LoRa can fully address the mIoT requirements since neither fully exploits the degrees of freedom from the perspective of the generalized waveform class. Finally, a solution is devised to optimize energy and resource efficiency under various deployment environments and practical constraints while maintaining the low-complexity property.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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