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相关概念视频

Receiver Operating Characteristic Plot01:15

Receiver Operating Characteristic Plot

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A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
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Long-patch Base Excision Repair01:02

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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

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Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
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Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
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Bewley Lattice Diagram01:12

Bewley Lattice Diagram

854
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Updated: Sep 11, 2025

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在OFDMA VLC系统中的资源分配和BER性能分析.

Moslem Forouzesh, Seyed Sadra Kashef

    Optics express
    |August 13, 2025
    PubMed
    概括

    本研究建议在无线机体区域网络 (WBAN) 中用于可见光通信 (VLC) 的联合功率和子载波分配方案,以最大限度地降低符号错误率. 整合挂在墙上的镜子可提高可靠的通信,即使患者的运动和障碍物.

    科学领域:

    • 无线通信系统无线通信系统
    • 生物医学工程 生物医学工程
    • 光学网络的建立是因为光学网络.

    背景情况:

    • 无线人体区域网络 (WBAN) 对于远程患者监控至关重要.
    • 可见光通信 (VLC) 为医疗WBAN提供了一个高效的解决方案,特别是用于外部链接.
    • 尽量减少符号错误率 (SER) 对于可靠的医疗数据传输至关重要.

    研究的目的:

    • 为医疗WBAN中的VLC系统提出一个联合的功率和子载波分配方案.
    • 在传输功率限制和用户率要求下,尽量减少SER.
    • 评估道条件和新型通信策略对系统性能的影响.

    主要方法:

    • 开发了VLC系统的联合电力和子载波分配方案.
    • 采用了改进的通道模型,结合了接收信号功率依赖噪声 (RSN).
    • 评估了接收器倾斜和挂在墙上的镜子 (对于LoS和NLoS) 对资源分配的影响.

    主要成果:

    • RSN和接收器倾斜显著影响资源分配策略.
    • 拟议的方案有效地将医疗WBAN中的SER降到最低.
    • 使用NLoS链接与挂在墙上的镜子可以将断电概率降低到接近零.

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    结论:

    • 拟议的资源分配方案提高了基于VLC的医疗WBAN的可靠性.
    • 挂在墙上的镜子是一个可行的解决方案,可以保持通信的稳定性,防止运动和障碍物.
    • 具有战略资源管理的VLC技术对未来的医疗保健应用有很大的前景.