Abstract
As a multi hop self-organizing network, wireless sensor network has the ability to cooperatively sense, collect and process the information of the sensed objects. The applications of WCN in 5G-based Internet of Vehicles (5G-IoV), using information fusion and intelligent information processing technologies, can obtain more reliable and accurate detection parameters, which has been widely concerned. However, the massive connectivity and information exchange in 5G-IoV pose great challenges to the bandwidth efficiency. In order to overcome these issues in 5G-IoV networks, a performance enhanced scheme based on non-orthogonal multiple access (NOMA) is proposed. In the proposed scheme, different vehicle locations are respectively discussed, i.e., whether in the overlap region of cluster head vehicles (CHVs). In particular, different to conventional works, each receiving node only decodes the desired signal to avoid performance loss provided from the poor channel quality limitation. On the other hand, all CHVs decode-and-forward new superposition coded signals with new power allocation factors, while that the maximum ratio combining is utilized at receivers to further improve the ergodic sum-rate (SR) and probability of conflict. The closed-form expressions of ergodic SR for our proposed scheme are analyzed under the independent Rayleigh fading channels. Numerical results corroborating our theoretical analysis show that the superposition coded signal transmission scheme applied to the proposed NOMA-IoV improves the ergodic SR performance significantly compared with the existing works, especially for the high signal-to-noise region.
Highlights
In recent years, traffic safety, travel efficiency, environmental protection and other issues caused by the growing number of cars have became prominent, which results in the research and development of related fields of Internet of Vehicles (IoVs) concerning [1, 2]
3 Methods In this paper, we focus on the downlink transfer scheme for non-orthogonal multiple access (NOMA)-IoV system involving one base station (BS), two cluster head vehicles and three vehicles as shown in Fig. 1, where all the nodes are equipped with a single antenna with perfect channel state information (CSI) and half duplex transmission protocol
5.1 Numerical results we show the numerical results in terms of ergodic SR to demonstrate the performance of the proposed NOMA-IoV system
Summary
Traffic safety, travel efficiency, environmental protection and other issues caused by the growing number of cars have became prominent, which results in the research and development of related fields of Internet of Vehicles (IoVs) concerning [1, 2]. The IoV is based on the intranet and mobile Internet, which integrates the Global Position System (GPS), sensors, radio frequency identification (RFID), data mining, automatic control and other related technologies [3]. According to the agreed architecture, communication protocol and data interaction standard, it is in the process of the vehicle-X(X: vehicle, road, pedestrian, Internet) interaction to realize the integrated network of intelligent traffic management, intelligent dynamic information. Gu et al J Wireless Com Network (2021) 2021:63 service and vehicle intelligent control. With the help of V2X wireless communication technology, IoVs can break through the technical bottleneck of single vehicle in intelligent development, and intuitively improve the intelligent level and automatic driving ability of the Internet connected vehicles [7]. The vehicle clustering has been utilized to reduce the complexity of V2X communications that would improve road traffic efficiency
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