This manuscript investigates the system performance of hybrid wireless and power line communication networks for indoor Internet of Things applications. Differentiating itself from the existing literature, the performance of the direct link and dual-hop energy harvesting relay-aided links is analyzed under the condition of indoor fading modeled by log-normal distribution. Moreover, the manuscript presents the analytical expressions of the successful transmission probability of the deployed opportunistic decode-and-forward and amplify-and-forward relay selection scheme, and validates them with Monte Carlo simulations. Moreover, the impact of different system parameters on the successful transmission probability is revealed. For the considered hybrid system, in general, the opportunistic decode-and-forward relaying scheme outperforms the opportunistic amplify-and-forward relaying scheme. As importantly, increasing the source to relay distance and power splitting ratio over certain limits significantly deteriorates the system performance, indicated by the decrease in the successful transmission probability.
In this paper, we consider a non-orthogonal multiple access (NOMA) based underlay cognitive radio (CR) system consisting of a source, two destinations, and a relay in the secondary network. The source communicates with two destinations using the NOMA technique via the assistance of the relay operating in full-duplex (FD) mode. The operations of all secondary nodes are affected by the interference from a primary transmitter. Meanwhile, secondary transmitters must adjust their transmission powers so that the interference probability to a primary receiver is always less than a given value. Under this average interference power constraint, we propose the maximum average interference power (MAIP) constraint for the relay to achieve its highest possible average transmit power. Based on the MAIP constraint, we derive the exact closed-form expression of the outage probabilities and ergodic capacities at two destination users. Monte-Carlo simulations verify the accuracy of the obtained mathematical expressions. Numerical results show that the considered NOMA-FD-CR relay system's performance is significantly affected by the interference from the primary transmitter and the maximum tolerable interference of the primary receiver. Additionally, using the MAIP constraint at the relay substantially improves the quality of the received signal at the far user with a slight reduction in the signal quality at the near user and fulfills the interference constraint without needing the instantaneous channel state information (CSI).
Due to the development of state-of-the-art fifth-generation communication (5G) and Internet-of-Things (IoT), the demands for capacity and throughput of wireless networks have increased significantly. As a promising solution for this, a radio access technique, namely, non-orthogonal multiple access (NOMA) has been investigated. Particularly, in this paper, we analyse the system performance of a joint time allocation and power splitting (JTAPS) protocol for NOMA-based energy harvesting (EH) wireless networks over indoor scenarios, which we modelled with log-normal fading channels. Accordingly, for the performance analysis of such networks, the analytical expression of a metric so-called “ergodic outage probability” was derived. Then, thanks to Monte Carlo simulations done in Matlab, we are able to see how different EH power splitting (PS) and EH time switching (TS) factors influence the ergodic outage probability. Last, but not least, we plot the simulation results along with the theoretical results for comparison studies.
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