Cluster-based Multi-hop Networks Research Articles

Performance Analysis of Wireless Energy Harvesting Multihop Cluster-Based Networks Over Nakagami- ${m}$ Fading Channels

This paper studies the performance analysis of wireless energy harvesting (EH) cluster-based multi-hop networks, where all communication nodes harvest energy from the radiated signals transmitted by multiple power beacons (PBs) to support the information transmission. To this end, we propose three relay selection schemes. The first scheme tries to select the relay harvesting the largest energy to forward information. The second scheme chooses the relay, providing the best data channel gain from the transmitter to forward information. In the third scheme, two relays in two consecutive clusters will be selected based on the maximum EH link and maximum data link. The destination node is equipped with multiple antennas and applies the maximal ratio combining technique to combine its received signal. The system performances in terms of outage probability of three schemes are evaluated in Nakagami- ${m}$ fading environments and verified by Monte Carlo simulations.

Secrecy Performance Analysis of Multihop Transmission Protocols in Cluster Networks

In this paper, we investigate the secured transmission in cluster-based multi-hop networks. In particular, we evaluate the secrecy performance of three various protocols over Rayleigh fading channel. In the first protocol, at each cluster, a relay is randomly selected to forward the source message to the next cluster. In the second and third ones, relay selection methods are applied to enhance secrecy performance. We derive closed-form expressions of secrecy outage probability and capacity, and then perform Monte Carlo simulations to verify the derivations.

Distributed Ad Hoc Cooperative Routing in Cluster-Based Multihop Networks

Ad Hoc Routing (AHR) was proposed to replace optimal routing in cluster-based multihop networks since it offers lower implementation complexity. However, this complexity reduction comes at the cost of an increase in the required transmission power. In addition, when the conventional distributed relay selection is applied to implement AHR, another increase in the required transmission power occurs due to the receiver selection error. In this paper, Ad Hoc Cooperative Routing (AHCR) that integrates the cooperative transmission with AHR is presented to reduce the difference between the required transmission power of AHR and that of optimal routing. Besides, Distributed Ad Hoc Cooperative Routing (DAHCR) scheme 1 that combines the cooperative transmission with AHR is proposed to reduce the difference between the required transmission power of DAHR and that of AHR. We then address the problem of DAHCR scheme 1 and propose DAHCR scheme 2. Simulation results show that the required transmission power of AHCR and DAHCR scheme 1 is less than that of AHR and DAHR, respectively. In addition, DAHCR scheme 2 further reduces the required transmission power of DAHCR scheme 1. On the other hand, DAHCR scheme 1 increases the complexity by 43% compared to DAHR. Besides, DAHCR scheme 2 increases the complexity by 1.97% compared to DAHCR scheme 1.