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Related Concept Videos

Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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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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¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Transmission Line Design Considerations01:23

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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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Carrier Generation and Recombination01:22

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Precoder and Decoder Co-Designs for Radar and Communication Spectrum Sharing.

Yuanhao Cui1, Visa Koivunen2, Xiaojun Jing1

  • 1School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Sensors (Basel, Switzerland)
|April 12, 2022
PubMed
Summary
This summary is machine-generated.

New methods enable radar and communication systems to share radio spectrum efficiently. This joint design cancels interference, improving radar detection and communication rates for future wireless technologies.

Keywords:
communication-radar coexistenceintegrated sensing and communicationsspectrum sharing

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Wireless Communications

Background:

  • Increasing demand for wireless services necessitates spectrum sharing between radar and communication systems.
  • Evolving spectrum regulations require diverse radio systems (e.g., 5G NR, LTE, Wi-Fi) to coexist with S-band radars.
  • Effective interference management is crucial for successful spectrum sharing.

Purpose of the Study:

  • To propose a novel nullspace-based joint precoder-decoder design for coexisting multicarrier radar and multiuser multicarrier communication systems.
  • To leverage interference alignment (IA) theory for enhanced spectrum utilization.
  • To improve performance metrics for both radar and communication subsystems.

Main Methods:

  • Developed a joint precoder-decoder design utilizing the maximizing signal interference noise ratio (max-SINR) criterion.
  • Incorporated interference alignment (IA) constraints to manage the interference channel.
  • Analyzed the system's degree of freedom (DoF) for the K+1-radar-communication-user interference channel.

Main Results:

  • Achieved a maximum degree of freedom upper bound for the interference channel through IA.
  • Demonstrated practical full cancellation of interference in both radar and communication systems via simulations.
  • Showcased significant performance gains compared to precoder-only designs.

Conclusions:

  • The proposed joint precoder-decoder design effectively manages interference in coexisting radar and communication systems.
  • Full interference cancellation leads to enhanced radar detection performance and higher communication data rates.
  • This approach offers a viable solution for efficient spectrum sharing in future wireless environments.