Abstract
As one of key technologies of future networks, vehicle-to-everything (V2X) communication has recently been proposed to improve conventional vehicle systems in terms of traffic and communications. Main benefits of using V2X are efficient and safe traffic as well as low-latency communications and reliable massive connections. Non-orthogonal multiple access (NOMA) scheme was introduced as a promising solution in the fifth-generation (5G) mobile communications, by which quality-of-service (QoS) requirements of many 5G-enabled applications are satisfied as a result of improved network throughput and lower accessing and transmission latency. In this paper, we study NOMA-based communications between vehicles equipped with multiple antennas over Nakagami-m fading channels in V2X networks, in which uplink and downlink transmission between two vehicles with upper controller are supported by a road side unit (RSU) to increase the capacity rather than simply be connected to the base station. In the NOMA-V2X system under study, the outage probability depends on the power allocation factor of RSU transmission and the operation of successive interference cancellation (SIC) at vehicles. Analyses and simulations verify that the outage performance of NOMA-V2X system are mainly affected by fading parameters, levels of imperfect SIC, and power allocation factors.
Highlights
Vehicle-to-everything (V2X) networks are expected to enable various applications of emerging and promising technologies in Internet of Things (IoT)
For performance evaluation of Non-orthogonal multiple access (NOMA)-V2X, we investigate a typical pair of vehicles with random pairing in NOMA networks
We studied the outage performance of vehicles equipped with multiple antennas in NOMA-V2X networks over Nakagami-m fading channels
Summary
Vehicle-to-everything (V2X) networks are expected to enable various applications of emerging and promising technologies in Internet of Things (IoT). In a dense environment causing severe data congestion, the LTE-based vehicle networks may meet new challenges to satisfy requirements of low latency, high reliability, and a large number of connected devices [3,4,5] These requirements are different from those of LTE D2D communications in which easier demands are required by V2X applications. A power allocation scheme maximizing the achievable sum-rate was proposed in [16], where a relay node provides the ability to allow multiple FUs’ DL and UL transmissions in the TW-CNOMA scheme. Different from [26], we consider the relay-assisted NOMA-based broadcasting/multicasting schemes for the links from BS to vehicles. NOMA and relay-assisted broadcasting/multicasting communications, we can improve spectrum efficiency, increase the number of connections, and achieve lower latency and high reliability.
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