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相关概念视频

Communication01:03

Communication

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Communication01:28

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Sharing information, concepts, and emotions to foster mutual understanding is communication. The sender, recipient, and transaction must be considered in this manner. The sender is the person who shares the message, the recipient is the person who receives and understands the message, and the transaction is the method used to deliver the message and the variables that affect the communication's context and surroundings. The nurse-client connection is built on therapeutic communication.
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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Frequency-dependent Selection01:21

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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Updated: Feb 14, 2026

Data Communication Based on MQTT in a Polymer Extrusion Process
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差异反射频调制与QAM用于基于RIS的通信.

Yajun Fan1,2, Le Zhao1,2, Wencai Yan1,2

  • 1The Key Laboratory of Grain Information Processing and Control (Henan University of Technology), Ministry of Education, Zhengzhou 450001, China.

Sensors (Basel, Switzerland)
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概括
此摘要是机器生成的。

不同反射频调制 (DRFM) 通过通过反射模式,载体和符号共同编码数据来增强无线通信,而不需要通道状态信息 (CSI). 一个新的方程振幅调制 (QAM) 方案进一步提高了DRFM的性能.

关键词:
不同反射频调制的不同反射频调制.四位数幅度调制的四位数幅度调制.可重新配置的智能表面.

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科学领域:

  • 无线通信无线通信
  • 信号处理 信号处理

背景情况:

  • 可重新配置的智能表面 (RIS) 辅助索引调制 (IM) 为下一代无线网络提供了潜力.
  • 获取基于RIS的IM系统的通道状态信息 (CSI),特别是多域IM,会导致大量的飞行员开销.

研究的目的:

  • 引入一种新的差异反射频调制 (DRFM) 系统,将直角频率分割复杂化 (OFDM) 与RIS辅助的差异反射调制 (DRM) 集成在一起.
  • 开发一个无CSI的DRFM系统,减少飞行员的开销,提高通信效率.
  • 设计和评估DRFM的高速方程振幅调制 (QAM) 方案,以提高吞吐量和性能.

主要方法:

  • 该DRFM系统通过反射模式,分组载体和星座符号的激活排列来共同编码信息位.
  • 发射器使用克罗尼克产品将不同编码的反射时间和时间频率块结合起来.
  • 为DRFM设计了一种新的高速率QAM方案,与传统调制相比,它提供了更好的数据速率和错误性能.

主要成果:

  • 拟议的DRFM系统有效地运行,不需要在发射器,RIS或接收器上进行CSI,从而消除了飞行员的开销.
  • 与基于PSK的DRFM相比,新的QAM方案提高了DRFM的吞吐量和性能.
  • 模拟结果表明,QAM辅助的DRFM在类似的光谱效率下优于传统的PSK,APSK和恒星QAM调制,但SNR受到轻微的损害.

结论:

  • 对于RIS辅助系统来说,DRFM提供了一个有前途的无CSI通信范式,大大降低了开销.
  • 结合OFDM和一种新的QAM方案,提升了DRFM的能力,提供了卓越的性能和光谱效率.
  • 对于未来的无线通信系统来说,DRFM是一个可行的和高效的解决方案,特别是那些采用RIS技术的无线通信系统.