Investigation on energy harvesting enabled device-to-device networks in presence of co-channel interference

1. TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol. 19, No. 1, February 2021, pp. 27∼35 ISSN: 1693-6930, accredited First Grade by Kemenristekdikti, No: 21/E/KPT/2018 DOI: 10.12928/TELKOMNIKA.v19i1.16138 r 27 Investigation on energy harvesting enabled device-to-device networks in presence of co-channel interference Thanh-Luan Nguyen1 , Dinh-Thuan Do2 1 Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City, Vietnam 2 Wireless Communications Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam Article Info Article history: Received Mar 25, 2020 Revised Jul 7, 2020 Accepted Sep 24, 2020 Keywords: Amplify-and-forward Co-channel interference Energy harvesting Ergodic capacity Outage capacity ABSTRACT Energy harvesting from ambient radio-frequency (RF) sources has been a novel approach for extending the lifetime of wireless networks. In this paper, a cooperative device-to-device (D2D) system with the aid of energy-constrained relay is considered. The relays are assumed to be able to harvest energy from information signal and co- channel interference (CCI) signals broadcasted by nearby traditional cellular users and forward the source’s signal to its desired destination (D2D user) utilizing amplify-and- forward (AF) relaying protocol. Time switching protocol (TSR) and power splitting protocol (PSR) are proposed to assist energy harvesting and information processing at the relay. The proposed approaches are applied in a model with three nodes in- cluding the source (D2D user), the relay and the destination (D2D user), the system throughput is investigated in terms of the ergodic capacity and the outage capacity, where the analytical results are obtained approximately. Our numerical results verify the our derivations, and also points out the impact of CCI on system performance. Fi- nally, this investigation provide fundamental design guidelines for selecting hardware of energy harvesting circuits that satisfies the requirements of a practical cooperative D2D system. This is an open access article under the CC BY-SA license. Corresponding Author: Dinh-Thuan Do Wireless Communications Research Group Faculty of Electrical and Electronics Engineering Ton Duc Thang University, Ho Chi Minh City, Vietnam Email: dodinhthuan@tdtu.edu.vn 1. INTRODUCTION Recent advances in energy harvesting technology has indicated that far-field wireless power transfer can also provide interesting aspects in wireless communication systems [1–7]. Notice that the source signals carry both energy and information at the same time. Hence, a hypothesis receiver which can process the information and harvest energy simultaneously is required [8, 9]. However, such device is difficult to im- plement since the limitation of circuitry. Furthermore, harvesting protocols for information processing and energy harvesting separately have been mentioned in many scientific papers [10, 11]. In cooperative device- to-device (D2D) networks, an intermediate relay is deployed between D2D users to enhance the coverage rate and throughput of communication systems [12, 13]. For both time-switching relaying (TSR) and power-splitting relaying (PSR) protocols, the co-channel Journal homepage: http://journal.uad.ac.id/index.php/TELKOMNIKA

2. 28 r ISSN: 1693-6930 interference (CCI) signals act as unnecessary signals, i.e. noises, in information processing phase; on the contrary, supply energy for forwarding information signal in the energy harvesting phase. More importantly, energy harvesting (EH) can be implemented in modern networks such as device-to-device (D2D) networks, small cell networks as many recent works in [14–18]. The authors in [14] examined joint optimization problem to maximize the energy efficiency evaluation related to D2D pairs together with the amount of harvested power by cellular user equipment. We need more complex technologies for D2D communications in some way in cellular bands [15–18]. The impacts of CCI signals are also considered in [19–24]. Motivated by these recent works, we continue to fill gap in the system performance under considering energy harvesting protocols in D2D scenario under impact of CCI by traditional cellular users. In this paper, the TSR and PSR receiver architectures and the corresponding protocols are also adopted. A three-node model of amplify-and-forward (AF) relaying is proposed for both protocols, where the source node can only communicate with destination node with the aid of an intermediate energy-constrained relay node. 2. SYSTEM MODEL Figure 1 illustrates the system model for the underlay D2D in which two devices, namely UEDS and UEDD, participate in the communication through a controlling base station (BS). Assuming heavily blocked line-of-sight (LOS) path from UEDS to UEDD, the EH-D2D relay is then deployed to assist the transmission. In addition, the relay harvests energy from the RF-signal emitted from the UEDS and each interferer UECi, i = 1, ..., M. Both the source-to-relay link and relay-to-destination link transmission experience quasi-static independent flat Rayleigh fading with the average gain E{|hS|2 } = ΩS and E{|hD|2 } = ΩD, respectively, in which E{·} specifies expectation operator. It is previously stated that the CUEs are the cross-mode interferers and can be treated as CCIs at the relay in the proposed model. The CCIs deteriorate the system performance but surprisingly aid the energy harvesting process at the relay. Relay 1 UEC M UEC BS interference Information link energy harvesting S UED D UED control link Figure 1. System model of D2D network under impact of the co-channel interferences 3. TIME SWITCHING-BASED RELAYING PROTOCOL Complying with the TSR-assisted relay architecture, after receiving the RF-signal broadcasted by UEDS, the relay passes the signal to the energy harvesting receiver for a duration of ξrT block time and then to the information receiver for that of (1 − ξr) T/2 block time [12]. Accordingly, the relay performs energy harvesting process and then information process, respectively. Under the presences of the UECs, i.e., the cellular users, the received signal at node R is modeled as yR (t) = hSs (t) + PM i=1 lisi(t) (t) + ñR[a] (t) , (1) where s (t) is the information signal with power of PS , E{|s(t)|2 }, hS ∈ C is the complex channel factor from UEDS to R, si (t) specifies the i-th interference signal with the power of Pi , E{|si(t)|2 }, li ∈ C TELKOMNIKA Telecommun Comput El Control, Vol. 19, No. 1, February 2021 : 27 – 35

3. TELKOMNIKA Telecommun Comput El Control r 29 denotes complex channel factor from UECi to R, the number of CCIs is denoted by M and ñR[a] (t) is the corrupted narrow band Gaussian noise observed at the receiving antenna. Subsequently, the received signal is converted to a basebanded complex signal after the down conversion process, which results the sampled baseband signal yR (k) given by yR(k) = hSs(k) + PM i=1 lisi(k) + nR[a] (k) + nR[c] (k) | {z } ,nTSR R (k) , (2) where si(k) and s(k) denote the signals induced after sampling the ith interfererence signal and the source signal, respectively, nR[a] (k) is the baseband additive white Gaussian noise (AWGN) at the receiving antenna, and nR[c] (k) is the sampled AWGN induced after being converted to baseband, si(k) and s(k) have zero means and variance of NR[a] and NR[c], respectively, and nTSR R (k) is defined as the total Gaussian noise at node R introduced from adopting the TSR architecture. The relay then utilizes ξrT block time to harvest energy from the received signals. Hence, the energy harvested at the relay is given by Eh = ξe PS |hS| 2 + PM i=1 Pi |li| 2 ξrT, (3) where ξe, with 0 ≤ ξe ≤ 1 represents the efficiency of the energy harvester, its value depends on the manu- facturer. Assuming that the relay fully absorbs the harvested energy to forward the received signal to the other D2D user, i.e., the UEDD node. Accordingly, the transmit power at the relay can be obtained as PR = Eh (1−ξr)T/2 = 2ξrξe 1−ξr PS |hS| 2 + PM i=1 Pi |li| 2 , (4) As a priority, the relay amplifies the received signal with a gain factor G and then forwards yR(k) to UEDD. The gain factor G is given by G = √ PR q PS |hS| 2 + PM i=1 Pi |li| 2 + NTSR R , (5) where NTSR R ∆ = NR[a]+NR[c] denotes the total Gaussian noise power observed at the relay under TSR protocol. Secondly, the received signal at UEDD after being sampled, yD (k) is given by yD(k) = hSs(k)hDG + PM i=1 lisi(k) + nTSR R (k) hDG + nD(k). (6) 4. POWER SPLITTING-BASED RELAYING PROTOCOL Let P be the received power at R and β, 0 ≤ β ≤ 1, denote the energy harvesting ratio of the PSR protocol, thus βP specifies the amount of power inputted into the energy harvester. The remaining power, i.e., (1 − β)P, inputs the information transmission to forward the UEDS’s signal to UEDD. Under the presences of cross-mode CCIs, the received signal observed at the relay antenna is yR (t) = hSs (t) + PM i=1 lisi(t) (t) + ñR[a] (t) . (7) The sampled baseband signal at the relay node, yR (k), is given by yR(k) = p (1 − β)hSs (k) + √ 1 − β M P i=1 lisi (k) + p 1 − βnR[a] (k) + nR[c] (k) | {z } ∆ =nPSR R (k) , (8) in which nPSR R (k) denotes the total Gaussian noise introduced by the PSR-assisted relay. At the relay, an amount of received signal, is adopted for energy harvesting. Hence, the energy harvested at the node R is Eh = ξe PS|hS|2 + PM i=1 Pi|li|2 ξrT. (9) Investigation on energy harvesting enable device-to-device networks... (Thanh-Luan Nguyen)

4. 30 r ISSN: 1693-6930 Assume that the harvested energy is perfectly consumed by the relay. As a result, the transmit power at the node R is expressed as PR = EH T/2 = ξe PS |hS| 2 + PM i=1 Pi |li| 2 β. (10) Similarly, the relay firstly amplifies the received signal with the gain factor, G, which can be expressed as G = √ PR q (1 − β) PS |hS| 2 + (1 − β) PM i=1 Pi |li| 2 + NPSR R , (11) where NPSR R ∆ = (1 − β) NR[a] + NR[c]. Accordingly, the received signal after the being sampled at the destination node, yD (k), is given by yD(k) = hSs(k)hDG + PM i=1 lisi(k) + nPSR R (k) hDG + nD(k). (12) 5. GENERAL ANALYSIS We find that the TSR and PSR protocols have similar mechanisms, deriving a general form for the signal-to-noise-plus-interence ratio (SINR) can be feasible. In order to derive an unified result, we define nY R (k) as the total Gaussian noise at the relay with variance of NY R (k) for the Y ∈ {TSR, PSR} protocol, the expressions of nTSR R (k) and nPSR R (k) are defined in the previous section. Therefore, the unified form of the achievable end-to-end SINR under the adoption of the protocol Y, denoted by ΨY gen, can be expressed as ΨY gen = γ1 γINF + 1 γY g 1 + NY R γ1+γINF + NY R , (13) in which γ1 , PS|hS|2 , γINF , PM i=1 Pi|li|2 , γTSR g , 2ξrξe 1−ξr |hD|2 ND and γPSR g , βξe |hD|2 ND . Hereafter, we define SNR , PSΩS/ND as the average signal-to-noise ratio (SNR). 5.1. Outage probability In this paper, considering the whole system, an outage event occurs whenever ΨY gen drops below an acceptable threshold, γth (dB). Accordingly, the outage probability is defined as PY out = Pr ΨY gen γth = FΨY gen (γth) . (14) It is not tractable to derive the exact outage probability in closed-form from (14). Hence, to simplify the calculation, we apply the high SNR approximation. At high SNR, where the UEDS transmits with relatively high power level, the term ”NY R/(γ1 + γINF )” in the denominator of (13) can be negligible. As a result, the approximated SINR at the relay is given by ΨY gen ≈ γ1 γINF + 1 γY g + NY R . (15) Therefore, the approximated outage probability, PY out, in (14) is then rewritten as FΨY gen (γth) ≈ Z ∞ 0 Z ∞ 0 Pr γ1 γth z + 1 y + NY R fγINF (y)fγY g (z)dydz. (16) Note that γTSR g and γPSR g are random variables having exponential distribution. Subsequently, the probability density function (PDF) of γY g is given by fγY g (z) , 1 γ̄Y g exp − z γ̄Y g , z 0, (17) TELKOMNIKA Telecommun Comput El Control, Vol. 19, No. 1, February 2021 : 27 – 35

5. TELKOMNIKA Telecommun Comput El Control r 31 where γ̄TSR g , 2ξrξe 1−ξr ΩD ND and γ̄PSR g = ξeβ ΩD ND . In addition, the CDF of γ1 is Fγ1 (x) = 1 − exp n − x γ̄1 o , where γ̄1 , PSΩS and the PDF of γINF is given by fγINF (y) = v(D) X i=1 τi(D) X j=1 χi,j(D) µ−j hii (j − 1)! yj−1 exp − y µhii , y 0, (18) in which D = diag (µ1, µ2, ..., µM ) specifies a diagonal matrix with the eigenvalues of µi = Pi ND Ωi, υ (D) denotes the number of distinct diagonal elements, µh1i µh2i ... µhυ(D)i are the distinct diagonal elements in descending order, τi (D) is the multiplicity of µhii, and χi,j(D) is the (i, j)-th characteristic coefficient of the matrix D [24]. Substituting (18) and (17) into (16), the approximated PY out expressed in the integral-form is given by PY out ≈1 − 1 γ̄Y g exp − NY Rγth γ̄1 v(D) X i=1 τi(D) X j=1 χi,j(D) (j − 1)! × 1 µj hii Z ∞ 0 yj−1 exp − γth γ̄1 + 1 µhii dy | {z } I1 Z ∞ 0 exp − γth γ̄1 − z γ̄Y g dz | {z } I2 . (19) Subsequently, the above integrals (I1 and I2) can be derived in closed-form with the help of [25, (2.3.3.1)] and [25, (2.3.16.1)] as I1 = ∞ Z 0 yj−1 exp − γth γ1 + 1 µhii y dy = Γ(j) γth γ̄1 + 1 µhii −j , (20) I2 = ∞ Z 0 exp − γth γ̄1z − z γ̄Y g dz = 2 γthγ̄Y g γ̄1 !1/2 K1 2 r γth γ̄1γ̄Y g ! , (21) respectively, where Kv (·) denotes the v-th order modified Bessel function of the second kind and Γ(x) specifies the Gamma function. Hence, the outage probability PY out can be approximated by using (21), (20) and (19) which then results the following equation after some algebraic steps PY out ≈1 − s 4γth γ̄Y g γ̄1 K1 s 4γth γ̄Y g γ̄1 ! exp − NY Rγth γ̄1 v(D) X i=1 τi(D) X j=1 χi,j(D) 1 + µhiiγth γ̄1 −j . (22) When the interfering signals are statistically independent and identically distributed (i.i.d.), i.e., µi = µ, i = 1, 2, ..., M, then υ (D) = 1 and τi (D) = M, the outage probability, PY out, is then reduced to PY out =1 − s 4γth γ̄Y g γ̄1 K1 s 4γth γ̄Y g γ̄1 ! exp − NY Rγth γ̄1 1 + µγth γ̄1 −M . (23) 5.2. Outage capacity and achievable throughput The outage capacity for the AF cooperative D2D system under consideration is given by CY O = 1 − PY out log2 (1 + γth) (24) The achievable throughput is defined in terms of effective transmission block time, which is the block time utilized for relay-to-destination transmission. According to [24], the achievable throughput of a cooperative system is given by τY O =      (1 − ξr)T/2 T CTSR O , Y ≡ TSR T/2 T CPSR O , Y ≡ PSR = (1 − ξr)CTSR O /2 , Y ≡ TSR CPSR O /2 , Y ≡ PSR (25) Investigation on energy harvesting enable device-to-device networks... (Thanh-Luan Nguyen)

6. 32 r ISSN: 1693-6930 5.3. Ergodic capacity and achievable throughput In this subsection, the throughput achieved by evaluating the Ergodic capacity in the unit of bits/Hz is derived as the third important metrics to evaluate the system performance. In the AF-cooperative D2D communication, using ΨY gen in (8), the received SINR at the relay, CE is given by CY E =E 1 2 log2(1 + ΨY gen) = Z ∞ 0 log2(1 + $)fΨY gen ($)d$, (26) where fΨY gen ($) stands for the PDF of the random variable ΨY gen. Applying the integration by parts for the integral in (32), the above expression becomes CY E = h log2(1 + $)(FΨY gen ($) − 1) i

9. ∞ 0 − 1 ln2 Z ∞ 0 1 1 + $ [FΨY gen ($) − 1]d$ (27) = 1 ln2 Z ∞ 0 1 1 + $ (1 − FΨY gen ($))d$, (28) where {f (x)} b a ∆ = f (b) − f (a) . Similarly as in 5.2, the throughput at the destination depends only on the effective transmission time, (1 − ξr) T/2 for TSR protocol and T/2 for PSR protocol, and can be expressed as τY E = (1 − ξr)CTSR O /2 , Y ≡ TSR CPSR O /2 , Y ≡ PSR (29) 6. NUMERICAL RESULTS In this section, the simulation results and the approximated analytical results are derived. To evaluate the effects of the interference on the system throughput we define SIR ∆ = PS ΩS PM i=1 PiΩi as the average signal-to- interference ratio. The variances are assumed to the identical and kept fixed, that is ND = 1, NR[a] = NR[c] = 1 and the SINR threshold, is set to 8 dB unless stated otherwise. In Figures 2-5, we assume a single interferer (M = 1). In addition, the energy conversion efficiency is set to 1 (ξe = 1). Importantly, in order to evaluate the impact of the interference on the throughput, we define kµk = µ {γINF } as the normalized power distribution, where µ = µh1i, µh2i, ..., µhMi . 0 0.2 0.4 0.6 0.8 1 0 0.5 1 1.5 ξ r Throughput (bit/s/Hz) Y = TSR Analytical SIR = 10 dB Analytical SIR = 20 dB Simulation τ E PSR τ O PSR Figure 2. Throughput as a function of the energy harvesting ratio with two values of the average SIR, the average SNR is set to 20 dB TELKOMNIKA Telecommun Comput El Control, Vol. 19, No. 1, February 2021 : 27 – 35

10. TELKOMNIKA Telecommun Comput El Control r 33 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 β Throughput (bit/s/Hz) Y = PSR Analytical SIR = 10 dB Analytical SIR = 20 dB Simulation τ E PSR τ O PSR Figure 3. Throughput τTSR E ,τTSR O , τPSR E and τPSR O as a function of the average SNR, in which SIR = 10 dB Figure 2 shows throughput τTSR E and τTSR O versus the energy harvesting ratio ξr for different values of average SIR where SNR is set to 20 dB. The simulation results of τTSR E are evaluated, where CY E and ΨY gen are obtained. The solid curves are the corresponding approximated analytical results of τTSR E which derived in (33). The dashed curves are the corresponding approximated analytical results of τTSR O derived. It is observed in Figure 3 that the throughput increases as the energy harvesting ratio, ξr increases from 0 to some optimal value but later as ξr continues increasing, the relay wastes more time on energy harvesting rather than information transmission resulting that the throughput of the system starts dropping down from its maximum value. 0 5 10 15 20 25 30 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 SNR (dB) optimal ξ r (Y = TSR) τO TSR SIR = 10 dB τO TSR SIR = 20 dB τE TSR SIR = 10 dB τE TSR SIR = 20 dB Figure 4. Optimal ξr versus the average SNR for different values of the average SIR 0 5 10 15 20 25 30 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 SNR (dB) optimal β Y = PSR τ O PSR SIR = 10 dB τO PSR SIR = 20 dB τE PSR SIR = 10 dB τ E PSR SIR = 20 dB Figure 5. Optimal β versus the average SNR for different values of the average SIR Figure 4 and Figure 5 shows the optimal ξr and optimal β, respectively, the corresponding optimal throughputs where the average SIR is set to 10 dB are illustrated in Figure 3. It is seen that, in TSR protocol, as the average SNR increases the optimal ξr decreases. This implies that the system performance can effectively be enhanced and the time spent for energy harvesting (ξrT ) can also be reduced by increasing the transmit power of the source, PS. In addition, the optimal ratios to achieve the optimal throughput τTSR E increases as the average SIR increases. However, the similar trend does not apply to optimal τTSR O , in this case, the optimal ξr does not change as the average SIR increases. The converse happened in PSR protocol, where the optimal β increases as the average SNR increases. Furthermore, the optimal β to achieve the optimal throughput τPSR E decreases as the average SIR increases. This implies that, in PSR protocol, more power is used for energy harvesting as the average SNR increases and less power can be needed if there is an increasing in the power of the interference. The impact of CCI power distribution to the system throughput is illustrated in Figure 6 and Figure 7 for system with TSR and PSR protocol, respectively. The energy harvesting ratio ξr and β are set to 0.2 and 0.8, respectively. Though the power distributions are different, e.g. kµ1k = (1.0, 0, 0, 0) , kµ2k = Investigation on energy harvesting enable device-to-device networks... (Thanh-Luan Nguyen)

11. 34 r ISSN: 1693-6930 (0.5, 0.5, 0, 0, 0) and kµ1k = (1.0, 0, 0, 0), but the total power of interferers remains the same value. It is observed that, the achievable throughput decreases as the normalized power distribution are changed from kµ1k to kµ2k and from kµ2k to kµ3k. 0 5 10 15 20 25 30 0 0.2 0.4 0.6 0.8 1 1.2 1.4 SNR (dB) Throughput (bit/s/Hz) Y = TSR Ana. µ = (1.0 0 0 0) Ana. µ = (0.5 0.5 0 0) Ana. µ = (0.25 0.25 0.25 0.25) Simulation τ E TSR τ O TSR Figure 6. Throughput τTSR E and τTSR O versus the average SNR under different CCI power distribution where the average SIR is set to 10 dB 0 5 10 15 20 25 30 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 SNR (dB) Throughput (bit/s/Hz) Y = PSR Ana. µ = (1.0 0 0 0) Ana. µ = (0.5 0.5 0 0) Ana. µ = (0.25 0.25 0.25 0.25) Simulation τ E PSR τ O PSR Figure 7. Throughput τPSR E and τPSR O versus the average SNR under different CCI power distribution where the average SIR is set to 10 dB 7. CONCLUSION In this paper, an AF cooperative D2D system was proposed where the EH-assisted relay is affected by co-channel interferences (CCI) from the CUEs. The energy-constrained relay absorbs the harvested energy from the received source signal and CCI signals to support the transmission between D2D users. The system performance can be deteriorated if the power of the CCI signals increases. One can effectively increase the system throughput by increasing the average SNR, this can be achieved by increasing the transmit power of D2D users. Lastly, different power distribution can also affect to the system throughput. REFERENCES [1] T.-L. Nguyen, D.-T. Do, ”Power Allocation Schemes for Wireless Powered NOMA Systems with Imperfect CSI: System model and performance analysis, ” International Journal of Communication Systems, vol. 31, no. 15, 2018. [2] D.-T. Do, et al., “Wireless power transfer enabled NOMA relay systems: two SIC modes and performance evaluation,” TELKOMNIKA Telecommunication Computing Electronics and Control, vol. 17, no.6, pp. 2697-2703, 2019. [3] D.-T. Do and C. B. Le, ”Exploiting Outage Performance of Wireless Powered NOMA,” TELKOMNIKA Telecommu- nication Computing Electronics and Control, vol. 16, no. 5, pp. 1907-1917, 2018. [4] D.-T. Do, M.-S. Van Nguyen, T. A. Hoang, B. M. Lee, “ Exploiting Joint Base Station Equipped Multiple Antenna and Full-Duplex D2D Users in Power Domain Division Based Multiple Access Networks,” Sensors,vol. 19, no. 11, pp. 2475-2494, 2019. [5] D.-T. Do and C. B. Le, “Application of NOMA in Wireless System with Wireless Power Transfer Scheme: Outage and Ergodic Capacity Performance Analysis,” Sensors, vol. 18, no. 10, pp. 3501-3517, 2018. [6] D.-T. Do, M.-S. V. Nguyen, “Outage probability and ergodic capacity analysis of uplink NOMA cellular network with and without interference from D2D pair,” Physical Communication, vol. 37, 2019. [7] R. Rajesh, V. Sharma, and P. Viswanath, ”Information capacity of energy harvesting sensor nodes,” Proc. 2011 IEEE Int. Symp. Inf. Theory, pp. 2363-2367, July 2011. [8] L. R. Varshney, ”Transporting information and energy simultaneously,” Proc. 2008 IEEE Int. Symp. Inf. Theory, pp. 1612-1616, July 2008. [9] P. Grover, A. Sahai, ”Shannon meets Tesla: Wireless information and power transfer,” Proc. 2010 IEEE Int. Symp. Inf. Theory, pp. 2363-2367, July 2010. [10] R. Zhang and C. K. Ho, ”MIMO broadcasting for simultaneous wireless information and power transfer,” IEEE Trans. Wirel. Commun., vol. 12, no. 5, pp. 1989-2001, May 2013. [11] B. Medepally and N. B. Mehta, ”Voluntary energy harvesting relays and selection in cooperative wireless networks,” IEEE Trans. Wirel. Commun., vol. 9, no. 11, pp. 3543-3553, November 2010. [12] A. A. Nasir, X. Zhou, S. Durrani, and R. A. Kennedy, ”Relaying protocols for wireless energy harvesting and information processing,” IEEE Trans. Wirel. Commun., vol. 7, no. 12, pp. 3622-3636, Nov. 2013. TELKOMNIKA Telecommun Comput El Control, Vol. 19, No. 1, February 2021 : 27 – 35

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Investigation on energy harvesting enabled device-to-device networks in presence of co-channel interference