The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Broadcasting is a part of the communication spectrum supported by VANETs through which information is disseminated to all the vehicles in the network. The dissemination process requires multiple retransmissions to achieve network coverage in a multi-hop environment. However, unsupervised retransmissions cause broadcasting storm, whereas on the other hand network coverage is cannot be achieved without...
A miniaturized Quad band-notch co-planar waveguide (CPW) ultrawideband (UWB) antenna is presented in this paper. The band-notch characteristics around S-band (2.70–3.10 GHz) and downlink C-band (3.70–4.20 GHz) are realized by etching meander-line and horizontal slot in radiating patch. Furthermore, by adding an extended stub and L-shaped slot on ground plane of the antenna, rejection in WLAN (4.90–5...
The Internet of Vehicles (IoVs) is an emerging paradigm aiming to introduce a plethora of innovative applications and services that impose a certain quality of service (QoS) requirements. The IoV mainly relies on vehicular ad-hoc networks (VANETs) for autonomous inter-vehicle communication and road-traffic safety management. With the ever-increasing demand to design new and emerging applications for...
A compact two-port diversity/MIMO antenna with dual band-notch characteristics for ultra wideband (UWB) applications is presented in this paper. The antennas exhibit a good impedance match over frequency band of 3.1 GHz–12 GHz, while exhibiting high isolation. Enhanced isolation is achieved with a decoupling structure having circular slots. The decoupling structure provides isolation of more than...
Internet of Things (IoT) will play an important role in the contemporary communication networks. In this modern and future communication paradigm hundreds of different smart Internet enabled devices will communicate with each other continuously. For such communication networks and smart devices, apart from the sophisticated communication protocols, efficient hardware will also play a very crucial...
In recent years, Vehicular Ad-hoc Networks (VANETs) have become important and critical part of the Intelligent Transport System (ITS). VANETs have brought the potential of new services and various applications for emergency, comfort and commercial use. However, designing a practical VANET architecture is still hindered with lot of challenges. One such challenge is to route the data packets from source...
Broadcasting is one of the communication mechanism utilised in VANET architecture through which an up-to-date traffic data can be disseminated among the commuters and this can help reduce traffic jams/congestions. Broadcasting storm (broadcasting) is considered to be an NP-hard problem consisting of multiple objectives. Conventional techniques use Multi-Objective Genetic Algorithms (MOGAs) to solve...
In this paper, a low cost broadband single layer reflectarray is proposed for X-band applications. The proposed reflectarray consists of truncated circular patch coupled to octagonalring delay line. The unit element is optimized to work at X-band with the center frequency of 10 GHz. A broad reflection phase range of more than 600° is obtained by varying the length of delay line. The reflectarray is...
A miniaturized dual port multiple-input multiple-output (MIMO) antenna, operating in ultrawideband (UWB) frequency band communication is presented in this paper. The antenna elements are located in side-by-side configuration. The suggested antenna exhibits a good impedance match (VSWR ≤ 2) covering frequency band of 2.5 GHz–10.4 GHz, while exhibiting high isolation. A structure consisting of a strip...
In this paper, a quad-band-notch Ultra Wideband (UWB) antenna is presented. The band-notch is achieved by introducing two meander-line slots in elliptical radiation element, a defected ground plane L-shape slot and an inverted U-slot in feed line. Four notches are achieved centered at frequencies WiMAX 3.5 GHz, IEEE 802.11a/n 5.2 GHz and 5.8 GHz and downlink X-band 7.4 GHz. The substrate employed...
In this paper, a UWB monopole antenna for GPR applications is presented. The antenna offers a large bandwidth from 250 MHz to more than 6 GHz and is relatively compact in size (20 cm × 22.5 cm) than other antennas operating in same frequency range. The time domain performance of this antenna is also analyzed for use it in impulse based radar systems. A prototype of antenna was manufactured and tested...
Achieving high Quality of Service (QoS) in routing is one of the major issues to be tackled in VANET. This is primarily due to the interference among vehicles and the objects present within the transmission environment. This also causes rapid degradation in transmitted signal and affects the overall system throughput. As a result, the system performance parameters such as delay, packet drop ratio...
In recent years, vehicular ad-hoc networks have emerged as a key wireless technology offering countless new services and applications for the transport community. Along with many interesting and useful applications, there have been a number of design challenges to create an efficient and reliable routing scheme. A conventional design approach only optimizes routing schemes without considering the...
Modeling wireless transmission in stringent networks such as VANETs is a challenging task. This requires mathematically incorporating all the environmental effects present within such a dynamics atmosphere. The key attributes to model the wireless channel are physical constraints inherent to such networks such as lack of permanent infrastructure, limited knowledge in relation to the position of vehicles...
Routing is an important and critical issue for successful transmission in Vehicular Ad-hoc Networks (VANETs). Most of the traditionally designed routing schemes are based on optimising their parameters individually in the existing VANET architecture. Such approaches may not result in an overall efficient system. Therefore, it is important to consider various parameters from multiple layers such as...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.