Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/94114
Title: | Stochastic analysis of urban V2X communications : orthogonality versus non-orthogonality | Authors: | Situ, Z Ho, IWH Xu, X Guan, YL Ding, C |
Issue Date: | Jul-2022 | Source: | ITU Journal on future and evolving technologies, 1 Jul 2022, v. 3, no. 2, p. 19-33 | Abstract: | In this paper, we study the broadcasting performance of urban Vehicle-to-everything (V2X) communications at road intersections. In such environments, dense buildings obstruct the radio channel between vehicles in adjacent road segments and Non-Line-Of-Sight (NLOS) signal propagation reduces the received power level. Therefore, messages that originate from adjacent roads traveling in a non-parallel direction usually have weaker signals than those from the road segment traveling in parallel opposite direction. Besides, the high vehicular density leads to insufficient orthogonal channel resources and high level of interference. We propose to apply Non-Orthogonal Multiple Access (NOMA) to V2X communications at urban road intersections to enhance the spectrum efficiency and improve the Package Delivery Ratio (PDR) performance. With NOMA, signals from multiple transmitters are decoded together and the interference from undesired users can be canceled if these messages are retrieved. Specifically, we study two NOMA-based V2X communication schemes, namely, NOMA-V2X decoded by Successive Interference Cancellation (SIC-V2X) and NOMA-V2X decoded by Joint Decoding (JD-V2X). Based on the tools developed in stochastic geometry, we derive and compare the PDR expressions for both NOMA schemes and the Orthogonal Multiple Access (OMA) scheme. Our results indicate that 1) both NOMA schemes outperform the conventional OMA scheme and the PDR of LOS/NLOS communications with two-user access increases by 51%/369%; 2) for four-user access, the proposed NOMA scheme shows 375% goodput enhancement as compared with the OMA scheme; and 3) JD-V2X provides significant PDR enhancement compared with SIC-V2X in the high data rate regime. Finally, we also demonstrate that the random access based NOMA schemes can achieve lower transmission latency than collision-free scheduling schemes when the road is over 56% jammed. | Keywords: | Joint decoding (JD) Non-Orthogonal multiple access (NOMA) Stochastic analysis Successive interference cancellation (SIC) Vehicle-To-Everything (V2X) |
Publisher: | ITU | Journal: | ITU Journal on future and evolving technologies | ISSN: | 2616-8375 | DOI: | 10.52953/PGAH3644 | Rights: | © International Telecommunication Union, 2022 Some rights reserved. This work is available under the CC BY-NC-ND 3.0 IGO license: https://creativecommons.org/licenses/by-nc-nd/3.0/igo/. The following publication Situ, Z., Ho, I. W-H., Xu, X., Guan, Y. L., & Ding, C. (2022). Stochastic Analysis of Urban V2X Communications: Orthogonality versus Non-Orthogonality. ITU Journal on Future and Evolving Technologies, 3(2), 19-33 is available at https://dx.doi.org/10.52953/PGAH3644. |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
S-JNL-VOL3.ISSUE2-2022-A03-PDF-E.pdf | 5.39 MB | Adobe PDF | View/Open |
Page views
78
Last Week
1
1
Last month
Citations as of Sep 22, 2024
Downloads
41
Citations as of Sep 22, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.