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Cluster Cooperation in Wireless-Powered Sensor Networks: Modeling and Performance Analysis.

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This study explores wireless-powered sensor networks (WPSNs) using cooperative relaying. Near cluster sensors can significantly reduce far cluster outage probability, enhancing overall network performance.

Keywords:
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Area of Science:

  • Wireless communication networks
  • Energy harvesting sensor systems
  • Cooperative relaying protocols

Background:

  • Wireless-powered sensor networks (WPSNs) face challenges in energy management and reliable data transmission.
  • Hybrid access points (HAPs) can provide both power and communication signals to sensors.
  • Cooperative communication strategies can improve network performance by utilizing relay nodes.

Purpose of the Study:

  • To investigate the performance of a WPSN with a hybrid access point and clustered sensors.
  • To analyze the impact of cooperative relaying from near cluster sensors to far cluster sensors.
  • To derive a closed-form expression for outage probability and evaluate system performance.

Main Methods:

  • Modeling the WPSN with a HAP, near cluster, and far cluster.
  • Utilizing sensors that harvest and store energy from the HAP's signals.
  • Employing an amplify-and-forward (AF) relaying strategy for cooperation.
  • Using a finite Markov chain to model relay battery dynamics.

Main Results:

  • A general analytical model for WPSN with cluster cooperation was developed.
  • Closed-form expressions for outage probability were derived.
  • Simulation results validated the theoretical analysis and demonstrated parameter effects.
  • High HAP transmit power drastically reduces far cluster outage probability without performance degradation for near cluster sensors.
  • The proposed cooperative scheme significantly outperforms direct transmission for the far cluster's outage performance.

Conclusions:

  • Cooperative relaying in WPSNs enhances performance, particularly for distant sensors.
  • The proposed model accurately predicts system behavior and guides design optimization.
  • WPSNs with intelligent relaying offer a promising approach for reliable wireless sensing.