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Joint Source and Relay Beamforming Design in Wireless Multi-Hop Sensor Networks with SWIPT.

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Summary

This study optimizes wireless sensor networks using simultaneous wireless information and power transfer. We developed joint beam-forming algorithms to maximize network rates under power and energy constraints for practical receiver schemes.

Keywords:
amplify-and-forwardbeam-formingdiagonalizationenergy harvestingmulti-hoppower splittingsimultaneous wireless information and power transfertime switchingwireless sensor networks

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Area of Science:

  • Wireless communication networks
  • Sensor networks
  • Signal processing
  • Energy harvesting

Background:

  • Explores amplify-and-forward wireless multiple-hop sensor networks (WMSN).
  • Addresses the need for autonomous systems through simultaneous wireless information and power transfer (SWIPT).
  • Investigates two practical receiver schemes: power splitting (PS) and time switching (TS).

Purpose of the Study:

  • To maximize the maximum achievable rate of the WMSN.
  • To develop a joint beam-forming solution for source and relay precoders.
  • To analyze performance under transmit power and harvested energy constraints.

Main Methods:

  • Employs power splitting (PS) for concurrent information decoding (ID) and energy harvesting (EH).
  • Utilizes time switching (TS) for dedicated ID or EH time slots.
  • Proposes diagonalization-based alternating optimization algorithms to handle non-convexity.

Main Results:

  • Achieves a joint beam-forming solution for source and relay precoders.
  • Demonstrates the convergence of the proposed optimization algorithms.
  • Confirms good performance of the algorithms under both PS and TS protocols.

Conclusions:

  • The proposed joint beam-forming strategy effectively maximizes WSN achievable rates.
  • Diagonalization-based alternating optimization provides a tractable solution for SWIPT in WMSNs.
  • The study validates the performance of PS and TS receiver schemes in practical scenarios.