Improved S-AF and S-DF Relaying Schemes using Machine Learning based Power Allocation over Cascaded Rayleigh Fading Channels

Abstract

<div>We investigate the performance of a dual-hop intervehicular</div><div>communications (IVC) system with relay selection</div><div>strategy. We assume a generalized fading channel model, known as cascaded Rayleigh (also called n*Rayleigh), which involves the product of n independent Rayleigh random variables. This channel model provides a realistic description of IVC, in contrast to the conventional Rayleigh fading assumption, which is more suitable for cellular networks. Unlike existing works, which mainly consider double-Rayleigh fading channels (i.e, n = 2); our system model considers the general cascading order n; for which we derive an approximate analytic solution for the outage probability under the considered scenario. Also, in this study we propose a machine learning-based power allocation</div><div>scheme to improve the link reliability in IVC. The analytical and simulation results show that both selective decode-and-forward (S-DF) and amplify-and-forward (S-AF) relaying schemes have the same diversity order in the high signal-to-noise ratio regime. In addition, our results indicate that machine learning algorithms can play a central role in selecting the best relay and allocation of transmission power.</div>

Outage Performance Analysis of Type-I HARQ Aided V2V Communications

“…On the one hand, both transmit and receive vehicles are in motion, which results in more significant Doppler effects and more rapid channel dynamics than cellular communications. On the other hand, the transceiver antennas are mounted at almost the same height, where the local scatterers in the surrounding environment incur more than one multiplicative small-scale fading processes, i.e., cascaded fading [2]. The local scattering objects include buildings, vehicles, street corners, tunnels, etc., which obstruct the direct link between two vehicles and lead to non-line-of-sight (NLOS) propagation channel condition [3], [4] (cf.…”

Performance Analysis of MIMO-HARQ Assisted V2V Communications With Keyhole Effect

“…Thus, V2V communications usually undergo time-varying fading channels, which lead to frequent estimations of channel state information (CSI). On the other hand, the transceiver antennas are mounted at almost the same height, where the local scatters in the surrounding environment incur more than one multiplicative small-scale fading processes, i.e., cascaded fading [2]. The local scattering objects include buildings, vehicles, street corners, tunnels, etc., which obstruct the direct link between two vehicles and lead to non-line-of-sight (NLOS) propagation channel condition [3] (cf.…”

Exact analysis of the multihop multibranch hybrid AF/DF relaying networks

“…Specifically, closed-form expression of symbol error probability for these three relaying protocols are derived. The work reported in Alghorani et al 26 has provided a comprehensive performance analysis of selective AF and DF relaying networks over cascaded Rayleigh fading channel in order to find diversity and outage probability. Authors have used machine learning technique to dynamically allocate transmit power to all signal, based on which the AF and DF mode is selected, which improved the overall throughput.…”