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This paper investigates the decode-and-forward (DF) full-duplex (FD) cooperative relaying system with SWIPT. Specifically, the relay node can harvest energy from the source’s RF signal, and then the harvested energy is used for transferring information to the destination. Besides, we consider both direct and two-hop relaying links to transmit data from the source to the destination. In the performance analysis, we derive the exact expressions for outage probability (OP) by applying the receiver’s selection combining (SC) technique. Then, the Monte Carlo simulation is performed to verify the correctness of the mathematical analysis. Finally, the simulations show that the mathematic expressions match simulation results, which authenticates the mathematical analysis.

Recently, the explosive growth of the Internet of Things (IoT) has led to a massive amount of traffic data, which has brought a great burden on the mobile devices’ energy consumption [

Besides energy harvesting, full-duplex technology for cooperative relaying systems also attracted significant attention from researchers [

Motivated by the above discussions, this paper proposed and investigated the system performance analysis of a SWIPT-aided relay network in the full-duplex (FD) decode-and-forward (DF) mode with the consistency of direct link from the selection source to a destination. Moreover, the relay node is equipped with a full-duplex antenna, and it can harvest energy from the source node. The contributions of this paper are listed as follows:

We model a novel SWIPT-enabled DF relaying network with full-duplex transmission in the presence of direct link to improve the total throughput at the destination.

Based on the proposed system model, we derive the exact closed-form expression of outage probability at the destination.

The correctness of the mathematical analysis is validated through Monte Carlo simulations. Specifically, the influences of different system parameters on the system performance are investigated, i.e., number of sources, rate threshold requirement, source transmit power, and power splitting ratio.

The remainder of this paper is organized as follows. In Section

We consider a cooperative relaying network as shown in Figure

System model.

IT and EH processes.

The channel between two users is assumed to be block Rayleigh fading, where channel gain is a constant value during one block and changes across different blocks. Moreover, the channel coefficient between node

The received signal at the relay is given as follows:_{0}, respectively.

The relay’s harvested energy is calculated as

From (

The received signal at the destination from the source and relay is, respectively, given by_{0} at the destination

In our model, we adopt the decode-and-forward (DF) protocol. Consequently, the signal-to-interference-to-noise ratio (SINR) at the relay

Substituting (_{0} << _{S}, we have

From (

For simplicity, we assume that

We propose the optimal source selection protocol, in which the best selection source is given as follows:

By denoting

Then, the corresponding probability density function (PDF) can be obtained by

The OP of the system can be defined as [

By combining with (

Specifically,

From (

Next,

By applying Eq. 3.324,1 of [

Substituting (

By combining (

Finally, by substituting (

The system throughput can be defined as [

This section provides the simulation results to verify the performance, i.e., outage probability (OP) and intercept probability (IP), of our proposed methods with the selection combining (SC) technique. The results are obtained by running

In Figure

OP and IP versus

Figure

OP and IP versus

Figure

OP and IP versus

In Figure

OP and IP versus

This paper studied the DF FD relaying network with a direct link between the source and destination. Specifically, the FD-enabled relay node can harvest energy from the source and transmit data to the destination at the same time. By taking into account the above discussions, we derive the exact closed-form expression of the outage probability (OP) in the receiver’s selection combining (SC) technique. Moreover, the simulation results show the correctness of the analytical results compared with the Monte Carlo simulation. For future works, we can extend this study to a more generalized model by considering a nonlinear EH. Another promising problem is to consider two-way relaying networks, which provide higher spectral efficiency.

No data were used to support this study.

The authors declare that they have no conflicts of interest.

Phu Tran Tin (

This research was supported by the Industrial University of Ho Chi Minh City (IUH), Vietnam, under Grant no. 72/HD-DHCN.