Scheduling-Based Transmit Signal Shaping in Energy-Constrained Molecular Communications
Scheduling-Based Transmit Signal Shaping in Energy-Constrained Molecular Communications
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DOI：
10.1109/tmbmc.2023.3329801
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发表时间：
2023-12
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影响因子：
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通讯作者：
Mustafa Can Gursoy;Urbashi Mitra
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文献类型：
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作者：
Mustafa Can Gursoy;Urbashi Mitra
基于扩散的分子通信（DBMC）系统依靠分子的扩散传播来传递信息。在DBMC系统中，由于每个发射的分子都经历随机延迟，因此脉冲整形对DBMC系统的可靠性和整体性能至关重要。为此，考虑到DBMC系统固有的资源有限性，本文提出了一种新的DBMC发射机建模和优化框架。利用无线分组调度理论的工具，DBMC脉冲整形问题被表述为一个能量受限的资源分配问题。通过所开发的框架，证明了可证明的使误差概率最小的最优脉冲形状是延迟尖峰脉冲，其中产生的延迟是可用能量收支的递减函数。然后将框架扩展到吸收和被动/观察接收器结构，以及分子在释放之前可以在发射体中降解的系统。数值结果证实了所开发的分析，并表明延迟尖峰在误差性能方面优于传统的非零宽脉冲形状。
Diffusion-based molecular communications (DBMC) systems rely on diffusive propagation of molecules to convey information. In a DBMC system, as each emitted molecule experiences a stochastic delay, pulse shaping is crucial for a DBMC system’s reliability and overall performance. To this end, acknowledging the inherent resource-limited nature of a DBMC system, a novel framework to model and optimize a DBMC transmitter is introduced in this paper. Leveraging tools from wireless packet scheduling theory, the DBMC pulse shaping problem is formulated as an energy-constrained resource allocation problem. Through the developed framework, it is shown that the provably optimal pulse shape that minimizes the error probability is the delayed-spike pulse, where the incurred delay is a decreasing function of the available energy budget. The framework is then extended to both absorbing and passive/observing receiver structures, as well as systems where molecules can degrade in the transmitter body prior to release. Numerical results corroborate the developed analysis, and show that the delayed-spike outperforms conventional, non-zero-width pulse shapes in terms of error performance.