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In this paper suggestion FPC for antenna design not only easy to control the antenna pattern on desired direction and radiation magnitude but also effective and quickly solved the complex tuning parameters of antenna application. Flexible printer circuit (FPC) board serves planar wireless antenna design. Effectively to supersede the antenna based on the traditional fixed printer circuit board (PCB)...
In this paper, we propose a tree-based adaptive broadcasting (TAB) algorithm for data dissemination to improve data access efficiency in vehicle communications. The proposed TAB algorithm first constructs a broadcast tree to determine the broadcast frequency of each data, and splits the broadcast tree into some broadcast wood to generate the broadcast program. In addition, this paper develops an analytical...
Mobile ad hoc networking technologies have increasingly been applied to civilian applications, in areas in which there is little or no communication infrastructure or the existing infrastructure is expensive or inconvenient to use, wireless mobile users will still be able to communicate through the formation of a MANET. Since the advent of wireless communication, the need for mobile ad hoc networks...
In this paper, we devised a novel indoor navigation system based on a probabilistic approach that employs data from the wireless adapter, accelerometer, and compass of the mobile device in order to determine user position. A routing algorithm employed by the device calculates the optimal path between user position and its destination. Experimental results verified that two meter accuracy was achieved...
The focus of this paper is on the precoding and feedback strategies for a radio backhaul link between an access base station (ABS) and the hub base station (HBS) in the presence of mobile stations (MSs). In this paper it is assumed that the access and the backhaul links are simultaneous and use the same frequency band. Two feedback links are exploited at the ABS in order to optimize the communication...
Currently, Transmission Control Protocol (TCP) is the dominant protocol used in the Internet. It is the transport protocol that is responsible for the transmission of around 90% of the Internet traffic. TCP was originally designed for wired network where packet loss due to congestion dominates. Mobile Ad Hoc Network (MANET), one of the wireless networks, has special characteristics which cause several...
This paper considers a realistic mobility model for a military application scenario using a wireless mesh sensor network. Within this model, the sink moves at the network boundary joining and leaving the network for different periods of time. Although the IEEE 802.15.5 standard has portability support for peripheral nodes (leaf devices) and is officially recommended for use in wireless mesh sensor...
Mobile Ad hoc Network (MANET) is the cooperative engagement of a collection of wireless mobile nodes without the support of any centralized access point or existing infrastructure. The use of virtual topologies is a good alternative to build wireless multi-hop networks. It aims to maintain a topology that optimizes broadcasting or network performances. The problem is to determine an appropriate topology...
This paper investigates the performance of Multihop connectivity for inter-vehicle communication (IVC) systems in Vehicular Ad Hoc NETwork (VANET). The hop path between two or more vehicles is dedicated when a broadcast signaling for initiation connectivity is successfully guaranteed. In addition, the performance of vehicular connectivity is not only based on maximum transmission range, but also based...
It is well known that future vehicles will be equipped with Vehicle-to-Vehicle or Vehicle-to-Infrastructure systems (V2X systems where V designates Vehicle and X designates Vehicle or Infrastructure), providing the driver with the actual traffic conditions on the whole route and detailed information about the road. Due to the development of new services, a car becomes a third Internet space succeeding...
Multi-beam spot diffusing optical wireless systems have been shown to offer performance improvement compared to conventional diffuse systems. In this work, the authors build on the genetic algorithm multi-spot diffuse technique [1] by adaptively optimising the power distribution among the radiating spots. Our goal is to reduce the effect of intersymbol interference and to improve the signal-to-noise...
To solve the collaboration issues between wireless Ad Hoc networks and Overlay Network, an Ad Hoc overlay network model was presented and a Key-based Indexing Mechanism (KIM) was proposed accordingly, based on the distributed algorithm of Overlay Network and mobile node local routing algorithm. The mechanism combines protocol of Overlay Network in Logical namespace with routing protocol of mobile...
Relay networks achieve high performance by utilizing cooperation between nodes which can classified as multi-hop networks and cooperative MIMO relaying networks. Cooperative diversity is a transmission technique to overcome fading, multipath and inter-channel interference. As an important part of "spatial diversity" systems, cooperative diversity involving multi hop data relays is a solution...
TCP protocol generally suffers from poor performance and network unfairness problems over multi-hop ad hoc networks. As designed for wired networks only, the legacy TCP always induces the over-reaction of network failure and hurts the quality of end-to-end connection in ad hoc networks. In this case, improvements have been proposed in the literature to help TCP to be aware of the different types of...
Vehicular Ad hoc Network (VANET), as a subclass of mobile Ad hoc Networks (MANETs), is a promising approach for traffic security, mobile internet and V2V communication. While the packet loss estimation of VANET impacts routing protocol and transmission control algorithm, it turns out to be an important issue. In this paper, we propose an estimation algorithm for packet loss on VANET, RPLE (Real time...
With the development of recent vehicular communication technologies, distributing multimedia contents in the vehicular communication networks (VCNs) has become more and more popular, to provide conveniences and entertainment services during the time of driving. However, as multimedia contents are changed and updated dynamically, how to keep the consistency between the original and these replicas in...
We propose an effective path selection considering current traffic load for IEEE 802.16j MMR networks. Previous schemes either consider channel quality or the number of hops in choosing the effective path for traffic to MSs. Our scheme avoids crowded links even though they have high channel quality. Our scheme balances between the channel quality and the current traffic load, aiming at higher fairness...
Vehicular ad hoc networks (VANETs) are an extreme case of mobile ad hoc networks (MANETs). High speed and frequent network topology changes are the main characteristics of vehicular networks. These characteristics lead to special issues and challenges in the network design, such as in medium access control (MAC). Due to the high speed and frequent network partitions, it is difficult to design a MAC...
The concept of wellness mobile is a novel mobile service wherein wireless handheld devices such as cell phones are equipped with a wellness monitoring application, thereby enabling real-time self-wellness monitoring by the cell phone user. The wellness mobile will provide a safe and protective environment for an increasing cell phone user-population to help combat anti-wellness factors such as stress,...
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