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関連する概念動画

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
418
The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

743
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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Propagation of Action Potentials01:23

Propagation of Action Potentials

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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
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Updated: Sep 10, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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強化された無線通信チャネルのための標準的な伝播モデルを使用して,アダプティブモジュール化技術の最適化

Rahim Khan1, Zahid Ullah Khan2, Sher Taj3

  • 1College of Information and Communication Engineering, Harbin Engineering University, Harbin150001, China.

Scientific reports
|August 21, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,標準伝播モデル (SPM) に統合された適応的調節技術を導入し,無線通信の効率を改善します. SPMで強化されたシステムは,ビットエラーレート (BER) を大幅に削減し,長距離リンクのスペクトル効率を高めます.

キーワード:
アダプティブ・モジュールビットエラー率異なるコミュニケーションチャネルM-aryフェーズシフトキーリングM-ary正方形振幅調節信号と干渉の比 + 騒音比標準的な伝播モデル

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科学分野:

  • ワイヤレス通信システム
  • 信号処理
  • 電気通信工学

背景:

  • パケットの損失や低スペクトル効率などの制限に直面しています.
  • 既存のコミュニケーション パラダイムは より良いパフォーマンスのために強化する必要があります.

研究 の 目的:

  • アダプティブ・モジュレーション技術を用いて無線システムの通信効率を向上させる.
  • ビットエラーレート (BER) を最小限に抑え,長距離のセルラーリンクのスループットを最大限にします.
  • 帯域幅の利用を改善するために標準伝播モデル (SPM) パラメータを最適化します.

主な方法:

  • 標準伝播モデル (SPM) に統合されたアダプティブ・モジュレーション・テクニックを利用した.
  • アディティブ・ホワイト・ガウスノイズ (AWGN),レイリー,リシアンフェイディングモデルにおける性能を評価した.
  • SPMパラメータを動的に選択するための高度な最適化アルゴリズムを使用しています.

主要な成果:

  • 10−2のターゲットBERを達成し,6 kmのセル半径での64-QAMモデュレーションのスペクトル効率を高めました.
  • 信号対干渉加減ノイズ比 (SINR) の有意な改善: 40% (AWGN),43% (レイリー),41% (リシアン).
  • SPMで強化されたシステムは,SINRが優れ,SPM以外の方法と比較してBERが低下した 64-QAMの安定的な展開を可能にしました.

結論:

  • 提案されたSPM統合型アダプティブ・モジュレーション技術は,無線通信の効率を効果的に高めます.
  • このシステムは様々なチャネル条件で堅実な性能を示し,従来のアプローチを上回ります.
  • 最適化されたSPMパラメータは,長距離セルラーリンクで高スペクトル効率と低BERを達成するために不可欠です.