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関連する概念動画

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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RISベースの通信のためのQAMによる微分反射周波数調節.

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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PubMed
まとめ
この要約は機械生成です。

微分反射周波数調節 (DRFM) は,チャンネル状態情報 (CSI) を必要とせずに,反射パターン,キャリア,シンボルを介してデータを共同でコーディングすることによって,無線通信を強化します. 新しい四角振幅調節 (QAM) システムは,DRFMのパフォーマンスをさらに向上させます.

キーワード:
微分反射周波数調節による周波数調節です.四角形の振幅調節は,四角形の振幅調節である.再構成可能なインテリジェントの表面.

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科学分野:

  • ワイヤレス通信 ワイヤレス通信
  • シグナル処理 信号処理

背景:

  • 再構成可能なインテリジェント・サーフェス (RIS) 支援インデックス・モジュレーション (IM) は,次世代無線ネットワークの可能性を秘めています.
  • RISベースのIMシステム,特にマルチドメインのIMのためのチャネル状態情報 (CSI) の取得は,重要なパイロットオーバーヘッドにつながります.

研究 の 目的:

  • 新規のディファレンシャル反射周波数調節 (DRFM) システムを導入し,直交周波数分割複合 (OFDM) とRIS支援のディファレンシャル反射調節 (DRM) を統合する.
  • CSIのないDRFMシステムを開発し,パイロットオーバーヘッドを削減し,通信効率を高める.
  • DRFMのための高速四角振幅調節 (QAM) スキムの設計と評価を行い,スループットとパフォーマンスを改善します.

主な方法:

  • DRFMシステムは,反射パターン,グループ化されたキャリア,星座シンボルのアクティベーションパルムテーションを通じて,情報ビットを共同で暗号化します.
  • 送信機は,Kronecker製品を使用して,反射時間と時間周波数ブロックを異なるコードで組み合わせます.
  • DRFM向けに新しい高速度QAMスキームが設計され,従来のモジュレーションと比較してデータレートとエラーパフォーマンスを向上させています.

主要な成果:

  • 提案されたDRFMシステムは,送信機,RIS,または受信機でCSIを必要とせずに効果的に動作し,それによってパイロットオーバーヘッドを排除します.
  • 新しいQAMスキームは,PSKベースのDRFMと比較してDRFMのスループットとパフォーマンスを向上させます.
  • シミュレーション結果は,QAM支援のDRFMが,SNRのわずかなペナルティで,同様のスペクトル効率で従来のPSK,APSK,およびスター-QAMの調節を上回ることを示しています.

結論:

  • DRFMは,RIS支援システムの有望なCSIフリー通信パラダイムを提供し,オーバーヘッドを大幅に削減します.
  • OFDMと新しいQAMスキームの統合により,DRFMの機能が向上し,優れた性能とスペクトル効率を提供します.
  • DRFMは,将来のワイヤレス通信システム,特にRISテクノロジーを採用するシステムの実現可能で効率的なソリューションです.