Simultaneous Wireless Power Transfer and Secure Multicasting in Cooperative Decode-and-Forward Relay Networks

Area of Science:

• Wireless communication networks
• Information theory
• Signal processing

Background:

• Cooperative decode-and-forward (DF) relays are crucial for extending network coverage and improving reliability.
• Simultaneous wireless information and power transfer (SWIPT) is an emerging technology enabling devices to harvest energy wirelessly.
• Secure multicasting ensures that information is delivered to intended recipients while preventing eavesdropping.

Purpose of the Study:

• To investigate simultaneous wireless power transfer and secure multicasting using cooperative DF relays.
• To address scenarios with multiple energy receivers and eavesdroppers under a total power budget.
• To optimize network performance by considering two distinct scenarios: maximizing minimum harvested energy and maximizing multicast secrecy rate.

Main Methods:

• The study employs semidefinite relaxation (SDR) to handle non-convex optimization problems.
• A bisection technique is utilized to find optimal solutions for power allocation and relay beamforming.
• Mathematical optimization frameworks are developed to analyze the trade-offs between energy harvesting and secure multicasting.

Main Results:

• The proposed methods effectively solve the transmit power allocation and relay beamformer design problems for both considered scenarios.
• Numerical results demonstrate the performance of the cooperative DF relay network in terms of energy harvesting and secure multicasting.
• The study provides insights into the achievable trade-offs between energy efficiency and security in SWIPT systems.

Conclusions:

• The research successfully demonstrates a framework for optimizing simultaneous wireless power transfer and secure multicasting in cooperative relay networks.
• The findings highlight the effectiveness of SDR and bisection techniques in addressing complex optimization challenges in wireless communications.
• This work contributes to the advancement of secure and energy-efficient wireless communication systems.