Outage analysis in two‐way communication with RF energy harvesting relay and co‐channel interference

Abstract

The study of relays with the scope of energy-harvesting (EH) looks interesting as a means of enabling sustainable, wireless communication without the need to recharge or replace the battery driving the relays. However, reliability of such communication systems becomes an important design challenge when such relays scavenge energy from the information bearing RF signals received from the source, using the technique of simultaneous wireless information and power transfer (SWIPT). To this aim, this work studies bidirectional communication in a decode-and-forward (DF) relay assisted cooperative wireless network in presence of co-channel interference (CCI). In order to quantify the reliability of the bidirectional communication systems, a closed form expression for the outage probability of the system is derived for both power splitting (PS) and time switching (TS) mode of operation of the relay. Simulation results are used to validate the accuracy of our analytical results and illustrate the dependence of the outage probability on various system parameters, like PS factor, TS factor, and distance of the relay from both the users. Results of performance comparison between PS relaying (PSR) and TS relaying (TSR) schemes are also presented. Besides, simulation results are also used to illustrate the spectral-efficiency and the energy-efficiency of the proposed system. The results show that, both in terms of spectralefficiency and the energy-efficiency, the two-way communication system in presence of moderate CCI power, performs better than the similar system without CCI. Additionally, it is also found that PSR is superior to TSR protocol in terms of peak energy-efficiency.

Performance analysis of full‐duplex cellular two‐way relay networks with the Nth worst relay selection under channel estimation error and cochannel interference

“…Besides CEE, we also consider that each relay is affected by N r number of CCI with power P I from the other users in the network, † whereas the end terminals are only impaired by the noise. 35,39,40 Consideration of CCI is indeed necessary because of the aggressive reuse of frequency channels for high spectrum utilization. Moreover, the channel coefficient between T r and ith (i = 1, … , N r ) interferer, h R ,i can be modeled as i.i.d.…”

“…Thus, the relays may be interfered by the other mobile and/or relays from the adjacent cell, and BS and USs are only affected by the noise. 35,39 Moreover, such an assumption can find its applicability, for instance, in scenarios where the BS and USs are located at the center of neighboring cells, while the relays are placed near to the borders. In addition, because of the existence of shadowing and deep fading in some specific geographical directions the BS and USs may not be affected by CCI, whereas the relays may suffer a lot.…”

“…where U is the number of points for the Gauss-Laguerre integration, and t m and w(t m ) gives the abscissas and weights of Gauss-Laguerre integration, respectively. Now, invoking the CDF F LB Λ (z) from (6) and the PDF LB Λ (z) (can be obtained by differentiating (6) with respect to z) into (39), the first moment E{Λ N,L } and second moment E{Λ 2 N,L } can be obtained by putting n = 1 and n = 2, respectively, in (39). Consequently, substituting E{Λ N,L } and E{Λ 2 N,L } into (37), we can obtain the closed-form expression of the ESR  LB sum .…”

Dynamic Power Splitting Strategy for SWIPT Based Two‐Way Multiplicative AF Relay Networks with Nonlinear Energy Harvesting Model

“…Up to now, several works have been reported regarding this issue [10][11][12][13][14][15]. Authors of [10,11] introduced decode-andforward (DF) and amplify-and-forward (AF) into PS strategy based SWIPT with two-step TWRNs, respectively. Reference 2 Wireless Communications and Mobile Computing [12] studied the optimal PS strategy to maximize the energy efficiency.…”

“…However, the above works discussed [10][11][12][13][14][15] were based on the assumption of a linear energy harvesting (LEH) model, which was shown to be inaccurate and not capable of capturing the nonlinear behaviour of RF energy harvesting (RF-EH) circuits [16]. As a result, those existing strategies based on the LEH model lead to significant performance loss in a real scenario owing to the mismatching between linear and nonlinear EH (NLEH) model.…”