NOMA-enabled Cooperative V2V Communications with Fixed-Gain AF Relaying

Year 2023, Volume: 11 Issue: 1, 1 - 12, 30.01.2023

Semiha Koşu , Serdar Özgür Ata

https://doi.org/10.17694/bajece.1090937

Cited By: 1

Abstract

By virtue of its improving bandwidth efficiency along with user fairness, non-orthogonal multiple access (NOMA) technique is considered a promising method for next-generation wireless communication systems. Since fading effect of wireless channels in vehicle-to-vehicle (V2V) communication systems are more severe than those in traditional systems, in this study, we employ the power-domain downlink NOMA technique in cooperative V2V communication systems to enhance data transmission capacity and network efficiency. In the proposed system, the base station communicates with two vehicular nodes, namely near and far users, through a relay vehicle employing the fixed-gain amplify-and-forward scheme. In real-life scenarios, the relay and the users move in high velocities; hence, the corresponding fading channels between these nodes are exposed as having double-Rayleigh fading characteristic in which the fading coefficient of a wireless channel is modeled as the product of two Rayleigh distributed random variables. To analyze the system performance, we first investigate the outage probability and derive its exact closed-form expressions for the near and far users. Then, we make the exact ergodic capacity analysis and obtain the closed-form solution for the near user. Furthermore, outage and ergodic performances of the NOMA-enabled system are compared to the simulation results of the traditional orthogonal multiple access approach. We also give analytic and numerical results to evaluate the performance of the proposed system and show the consistency of Monte-Carlo simulations with analytical derivations. It is observed that even with the small power allocation, both performances of the near user mostly outperform the far user.

Keywords

outage probability, amplify-and-forward, cooperative communications, double Rayleigh, ergodic capacity, fixed-gain, non-orthogonal multiple access, vehicular networks

Supporting Institution

Istanbul Technical University Vodafone Future Lab, Research Fund of the Istanbul Technical University

Project Number

ITUVF20190901P02, MYL-2019-42491

Thanks

This work was supported in part by the Istanbul Technical University Vodafone Future Lab under Project ITUVF20190901P02. The work of Semiha Koşu was supported by the Research Fund of the Istanbul Technical University under Project MYL-2019-42491.

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