基于Hammersley序列的张量积模型变换增强变量域控制

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"这篇研究论文探讨了通过基于汉默斯利序列的张量积模型变换增强变量领域控制的方法,即增强型高阶奇异值分解的超立方体网格生成,以及汉默斯利采样方法为基础的并行分布式补偿设计。" 在当前的控制理论与实践中,变量领域控制是一种有效的方法,它允许控制器根据系统的动态特性调整其操作域。这篇论文的标题"Enhancement of the Variable Universe of Discourse Control by Hammersley Sequence-Based TP Model Transformation"表明,作者旨在通过利用汉默斯利序列的张量积模型变换来提升这种控制策略的效果。这种方法的核心在于,它使用汉默斯利采样法生成高维空间中的超立方体网格,这在处理高阶奇异值分解时特别有用,因为高阶奇异值分解能揭示系统动态的复杂结构。 高阶奇异值分解(Higher Order Singular Value Decomposition, HOSVD)是一种矩阵分析技术,可以用于多维数据的降维和压缩,同时保持关键信息。在控制系统中,它可以用来识别系统的主要动态模式,这对于设计更精确和适应性强的控制器至关重要。论文提出的EHTPVUD(增强型张量积模型变换变量领域控制器)设计,就是基于这种思路,通过汉默斯利采样生成的网格来优化控制器的设计。 此外,论文还提出了一种基于汉默斯利采样方法的并行分布式补偿方案作为对比。并行分布式补偿(Parallel Distributed Compensation, PDC)通常用于状态反馈控制,通过分散控制回路来改善系统性能。在这里,汉默斯利采样法被用来生成增益,这些增益用于合成误差和误差导数,从而进一步优化控制策略。 EHTPVUD的设计是基于误差领域和误差导数领域的。这意味着控制器不仅考虑当前的误差状态,还考虑了误差的变化率,这可以提高控制系统的响应速度和稳定性。通过这种方式,EHTPVUD能够更加灵活地应对系统动态的变化,提高整体的控制性能。 这篇研究论文提供了一种创新的控制设计方法,利用汉默斯利序列的特性改进了变量领域控制,同时引入并行分布式补偿的概念,以应对复杂的系统动态。这一工作对于理解和改进现代控制系统,特别是在需要处理高维度数据和复杂动态的场景下,具有重要的理论和实践意义。

Unlike the classical encryption schemes,keys are dispensable in certain PLS technigues, known as the keyless secure strat egy. Sophisticated signal processing techniques such as arti- ficial noise, beamforming,and diversitycan be developed to ensure the secrecy of the MC networks.In the Alice-Bob-Eve model, Alice is the legitimate transmitter, whose intended target is the legitimate receiver Bob,while Eve is the eavesdropper that intercepts the information from Alice to Bob.The secrecy performance is quantified via information leakagei.ethe dif ference of the mutual information between the Alice-Bob and Alice-Eve links. The upper bound of the information leakage is called secrecy capacity realized by a specific distribution of the input symbols, namely,capacity-achieving distribution.The secrecy performance of the diffusion-based MC system with concentration shift keying(CSK)is analyzed from an informa- tion-theoretical point of view,providing two paramount secrecy metrics, i.e., secrecy capacity and secure distance[13].How ever, only the estimation of lower bound secrecy capacity is derived as both links attain their channel capacity.The secrecy capacity highly depends on the system parameters such as the average signal energy,diffusion coefficientand reception duration. Moreover, the distance between the transmitter and the eavesdropper is also an important aspect of secrecy per- formance. For both amplitude and energy detection schemes secure distance is proposed as a secret metricover which the eavesdropper is incapable of signal recovery. Despite the case with CSK,the results of the secure metrics vary with the modulation type(e.g.pulse position,spacetype) and reception mechanism(e.g.passive,partially absorbingper fectly absorbing).For ease of understanding,Figure 3 depicts the modulation types and the corresponding CIRs with different reception mechanisms. Novel signa processing techniques and the biochemical channel properties can further assist the secrecy enhancement in the MC system.The molecular beam forming that avoids information disclosure can be realized via the flow generated in the channel.Besidesnew dimensions of diversity, such as the aforementioned molecular diversity of ionic compounds, can beexploited. Note that the feasibility of these methods can be validated by the derived secrecy metrics.

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