{"title":"STAR-RIS-NOMA 赋权车对车通信:中断和遍历容量分析","authors":"Luxmi Kant Vishwakarma , Radhika Gour , Suneel Yadav , Adão Silva","doi":"10.1016/j.vehcom.2024.100852","DOIUrl":null,"url":null,"abstract":"<div><div>This paper delves into the performance evaluation of a non-orthogonal multiple access (NOMA) enabled vehicle-to-vehicle (V2V) communication system empowered by simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS). Herein, we consider that a moving access point (AP) transmits superimposed signals to nearby and distant NOMA vehicles simultaneously via reflection and transmission through a STAR-RIS equipped vehicle with 2<em>N</em> reconfigurable elements, respectively. Specifically, by characterizing all V2V channels as double-Rayleigh fading distributed, we derive the outage probability (OP) and ergodic capacity (EC) expressions for each NOMA vehicle, by employing both perfect and imperfect successive interference cancellation (SIC) at nearby vehicle user. Furthermore, we present the asymptotic OP behavior at high signal-to-noise ratio (SNR) regime to gain deeper insights into the diversity order of NOMA vehicles. The findings reveal that the nearby vehicle under perfect SIC and far vehicle experience a diversity order of <span><math><mfrac><mrow><mi>N</mi><msup><mrow><mi>π</mi></mrow><mrow><mn>4</mn></mrow></msup></mrow><mrow><mn>256</mn><mo>−</mo><msup><mrow><mi>π</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></mfrac></math></span>, which is the function of number of reconfigurable elements (<em>N</em>) in the STAR-RIS. Whereas, a zero diversity order is obtained for nearby user under imperfect SIC case. Moreover, we analytically discuss the high SNR slopes of EC for both user vehicles. Furthermore, Monte-Carlo simulations are conducted to validate our analytical results under various channel and system parameter configurations. We also provide a comparison between the proposed scheme and STAR-RIS based orthogonal multiple access and cooperative relaying systems.</div></div>","PeriodicalId":54346,"journal":{"name":"Vehicular Communications","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"STAR-RIS-NOMA empowered vehicle-to-vehicle communications: Outage and ergodic capacity analysis\",\"authors\":\"Luxmi Kant Vishwakarma , Radhika Gour , Suneel Yadav , Adão Silva\",\"doi\":\"10.1016/j.vehcom.2024.100852\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This paper delves into the performance evaluation of a non-orthogonal multiple access (NOMA) enabled vehicle-to-vehicle (V2V) communication system empowered by simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS). Herein, we consider that a moving access point (AP) transmits superimposed signals to nearby and distant NOMA vehicles simultaneously via reflection and transmission through a STAR-RIS equipped vehicle with 2<em>N</em> reconfigurable elements, respectively. Specifically, by characterizing all V2V channels as double-Rayleigh fading distributed, we derive the outage probability (OP) and ergodic capacity (EC) expressions for each NOMA vehicle, by employing both perfect and imperfect successive interference cancellation (SIC) at nearby vehicle user. Furthermore, we present the asymptotic OP behavior at high signal-to-noise ratio (SNR) regime to gain deeper insights into the diversity order of NOMA vehicles. The findings reveal that the nearby vehicle under perfect SIC and far vehicle experience a diversity order of <span><math><mfrac><mrow><mi>N</mi><msup><mrow><mi>π</mi></mrow><mrow><mn>4</mn></mrow></msup></mrow><mrow><mn>256</mn><mo>−</mo><msup><mrow><mi>π</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></mfrac></math></span>, which is the function of number of reconfigurable elements (<em>N</em>) in the STAR-RIS. Whereas, a zero diversity order is obtained for nearby user under imperfect SIC case. Moreover, we analytically discuss the high SNR slopes of EC for both user vehicles. Furthermore, Monte-Carlo simulations are conducted to validate our analytical results under various channel and system parameter configurations. 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引用次数: 0
摘要
本文深入探讨了通过同时传输和反射可重构智能表面(STAR-RIS)实现的非正交多址(NOMA)车对车(V2V)通信系统的性能评估。在此,我们考虑由一个移动接入点(AP)通过配备有 2N 个可重构元件的 STAR-RIS 的车辆,分别通过反射和传输向附近和远处的 NOMA 车辆同时传输叠加信号。具体地说,通过将所有 V2V 信道描述为双瑞利衰落分布,我们得出了每个 NOMA 车辆的中断概率(OP)和遍历容量(EC)表达式,并在附近车辆用户处采用了完美和不完美的连续干扰消除(SIC)。此外,我们还提出了高信噪比(SNR)情况下的渐进 OP 行为,以深入了解 NOMA 车辆的分集顺序。研究结果表明,在完美 SIC 条件下,近车和远车的分集阶为 Nπ4256-π2,这是 STAR-RIS 中可重构元素数量(N)的函数。而在不完善 SIC 的情况下,附近用户的分集阶数为零。此外,我们还分析讨论了两个用户车辆的高信噪比 EC 斜坡。此外,我们还进行了蒙特卡洛模拟,以验证我们在各种信道和系统参数配置下的分析结果。我们还对所提出的方案与基于 STAR-RIS 的正交多址和合作中继系统进行了比较。
STAR-RIS-NOMA empowered vehicle-to-vehicle communications: Outage and ergodic capacity analysis
This paper delves into the performance evaluation of a non-orthogonal multiple access (NOMA) enabled vehicle-to-vehicle (V2V) communication system empowered by simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS). Herein, we consider that a moving access point (AP) transmits superimposed signals to nearby and distant NOMA vehicles simultaneously via reflection and transmission through a STAR-RIS equipped vehicle with 2N reconfigurable elements, respectively. Specifically, by characterizing all V2V channels as double-Rayleigh fading distributed, we derive the outage probability (OP) and ergodic capacity (EC) expressions for each NOMA vehicle, by employing both perfect and imperfect successive interference cancellation (SIC) at nearby vehicle user. Furthermore, we present the asymptotic OP behavior at high signal-to-noise ratio (SNR) regime to gain deeper insights into the diversity order of NOMA vehicles. The findings reveal that the nearby vehicle under perfect SIC and far vehicle experience a diversity order of , which is the function of number of reconfigurable elements (N) in the STAR-RIS. Whereas, a zero diversity order is obtained for nearby user under imperfect SIC case. Moreover, we analytically discuss the high SNR slopes of EC for both user vehicles. Furthermore, Monte-Carlo simulations are conducted to validate our analytical results under various channel and system parameter configurations. We also provide a comparison between the proposed scheme and STAR-RIS based orthogonal multiple access and cooperative relaying systems.
期刊介绍:
Vehicular communications is a growing area of communications between vehicles and including roadside communication infrastructure. Advances in wireless communications are making possible sharing of information through real time communications between vehicles and infrastructure. This has led to applications to increase safety of vehicles and communication between passengers and the Internet. Standardization efforts on vehicular communication are also underway to make vehicular transportation safer, greener and easier.
The aim of the journal is to publish high quality peer–reviewed papers in the area of vehicular communications. The scope encompasses all types of communications involving vehicles, including vehicle–to–vehicle and vehicle–to–infrastructure. The scope includes (but not limited to) the following topics related to vehicular communications:
Vehicle to vehicle and vehicle to infrastructure communications
Channel modelling, modulating and coding
Congestion Control and scalability issues
Protocol design, testing and verification
Routing in vehicular networks
Security issues and countermeasures
Deployment and field testing
Reducing energy consumption and enhancing safety of vehicles
Wireless in–car networks
Data collection and dissemination methods
Mobility and handover issues
Safety and driver assistance applications
UAV
Underwater communications
Autonomous cooperative driving
Social networks
Internet of vehicles
Standardization of protocols.