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Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
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Design Example01:23

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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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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Localization Performance Analysis and Algorithm Design of Reconfigurable Intelligent Surface-Assisted D2D Systems.

Mengke Wang1, Tiejun Lv1, Pingmu Huang2

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

Sensors (Basel, Switzerland)
|June 19, 2024
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Summary
This summary is machine-generated.

This study introduces a cooperative localization system using reconfigurable intelligent surfaces (RISs) for high-precision positioning in millimeter-wave (mmWave) bands. The system achieves centimeter-level accuracy with reduced transmission power, overcoming blockage challenges.

Keywords:
beamforming designdevice-to-device (D2D)millimeter-wavepositioning error boundreconfigurable intelligent surfaces

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Area of Science:

  • Wireless Communication
  • Localization Systems
  • Signal Processing

Background:

  • High-precision localization in the millimeter-wave (mmWave) band is crucial but challenged by signal blockages.
  • Existing localization methods struggle with reliability in complex environments.
  • Device-to-device (D2D) communication offers potential for enhanced localization.

Purpose of the Study:

  • To propose a novel cooperative localization system for user equipment (UEs) assisted by reconfigurable intelligent surfaces (RISs).
  • To address the challenges posed by mmWave signal blockages in localization tasks.
  • To optimize the system for centimeter-level positioning accuracy and energy efficiency.

Main Methods:

  • Development of a cooperative localization model integrating RISs as anchor points and UEs.
  • Derivation of the positioning error bound (PEB) as a key performance metric.
  • Design of a joint beamforming strategy for UE-RIS communication to optimize channel state information (CSI) and minimize PEB.

Main Results:

  • The proposed RIS-assisted cooperative localization system achieves centimeter-level accuracy.
  • The system demonstrates superior performance compared to RIS-assisted base station positioning.
  • A reduction of 10 dBm in transmission power is achieved while maintaining high accuracy.

Conclusions:

  • The proposed UE-RIS cooperative localization system effectively overcomes mmWave blockage issues.
  • The joint beamforming design significantly enhances localization precision and efficiency.
  • This approach offers a promising solution for future high-accuracy, all-scenario localization.