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This work studies the SWIPT-based half-duplex (HD) decode-and-forward (DF) relay network, wherein the relay user can scavenge power from the source’s radio-frequency (RF) signals and then utilize it to convey the information to the destination. Specifically, two SWIPT-based relaying schemes, termed static power splitting- (SPS-) based relaying (SPSR) and optimal dynamic power splitting- (DPS-) based relaying (ODPSR), are proposed to investigate the benefits of each one fully. Based on the above discussions, the relaying system’s performance for outage probability (OP) is studied. Concretely, we derive the analytical expressions for both SPSR and DPSR methods. Finally, the numerical simulations are executed to corroborate the analysis and simulation results.

With the unprecedented growth of wireless data traffic and IoT devices (IoTDs), energy consumption in wireless communications has increased significantly in the last few decades [

This work analyzed the performance of the SWIPT-based half-duplex (HD) DF relay system, whereas the relay user scavenges power from the source RF signals and then uses it to transmit data to the destination. This research’s contributions are given as follows:

We propose a novel system model of a SWIPT-enabled DF relaying network with the PSR protocol. Moreover, we propose two SWIPT-based relaying schemes, namely, SPS-based relaying (SPSR) and optimal DPS-based relaying (ODPSR), to study each one’s advantages fully

Based on the proposed system model, we derive the analysis expressions of outage probability for SPSR and ODPSR schemes

The Monte Carlo simulations are presented to corroborate the mathematic analysis. Specifically, we also present an insightful analysis of the effectiveness of different system parameters on the system performance, i.e., source transmit power, number of relay nodes, energy harvesting coefficient, and rate threshold

The remainder of this paper is structured. The system model of the SWIPT-assisted DF relay system is presented in Section

We consider a SWIPT-assisted DF relaying network as in Figure

System model.

IT and EH processes with power-splitting relaying protocols.

Let us denote

Assume that all of the channels are Rayleigh fading. Hence, the channel gains

To take the path-loss model into account, we have

Then, the PDFs of

The received signal at the relay

The transmit power at relay

The received signal at the destination can be given as

From (

From (

Finally, the overall SNR and capacity of the system and can be, respectively, given by

In this paper, we apply the partial relay selection (PRS) method to improve communication performance. Specifically, the best relay can be selected among

From (

The CDF

By considering the independent and identical distributed (i.i.d.) random variables (RVs), i.e.,

The OP at the destination can be defined as

By combining with (

By applying (

From (

Substituting (

By applying (

Finally, with the help of ([

This part presents the numerical results to show the impacts of various parameters on the outage performance for the proposed SWIPT-enabled DF relaying network with PSR using Monte Carlo simulations [^{6} samples for each Rayleigh fading channel.

Figure

Outage probability versus

In Figure

Outage probability versus a number of sources (

Figure

Outage probability versus

Figure

Outage probability versus

This work proposed a new PSR protocol for a SWIPT-enabled relaying network over DF-based Rayleigh fading channels. The system model included one source, multiple relays, and one destination for the data transmission from source

There is no available data in our work.

The authors declare that they have no conflicts of interest.

The main contribution of Phu Tran Tin (

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