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This paper presents a geometric-based time-varying ultrawideband (UWA) channel model for the mobile robot-to-robot (R2R) communication scenario. The proposed model takes the nonstationarity of the channel into account. The influence of the ground reflected signal on the R2R channel is also considered in the model. To provide insight into the time-varying behaviour of the R2R channel, the concept of...
The scattering and reflections that occur-during indoor propagation create serious problems for multi-path channel transmissions due to seriously suffering from plenty of resolvable multipath components (MPCs) through line of sight (LOS) and non-line of sight (NLOS) environments. This high-gain antenna can be used to evaluate indoor, single-in single-out (SISO) and multiple-in multiple-out (MIMO)...
Optimum sensor node placement for Wireless Sensor Network (WSN) is needed for cost effective deployment that provides maximum coverage and minimum energy consumption without jeopardizing the connectivity. A sensor node placement technique that utilizes a new biologically inspired optimization technique that imitates the behavior of territorial predators in marking their territories with their odours...
We propose in this paper a new mechanism for selecting a most suitable partner in a cooperative wireless communication system, using a type of game called the Bidding game. In this game, in which the conventional theories of economic bidding are applied, the cooperative communication network is modeled as a single-user, multi-relay system in which the source acts as the auctioneer while the relays...
After the presence of high Bandwidth-Delay Product (high-BDP) networks, many researches have been conducted to prove either the existing TCP variants can achieve an excellent performance without wasting the bandwidth of these networks or not. In this paper, a comparative test-bed experiment on a set of high speed TCP variants has been conducted to show their differences in bandwidth utilization, loss...
The growing awareness towards energy efficient cellular networks has paved way for new technologies to enable design towards green cellular networks. According to technical analysts, the base stations are the most energy intensive element in a typical cellular network. Saving power in base stations is therefore the primary focus in green cellular networks. The main goal of designing green base stations...
Resource allocation management is one of the effective factors of WiMAX base station performance. Various goals could be achieved when the resource allocation scheme exploits in the right direction. However, the assessment of the resource allocation algorithms lacks to a uniform performance metrics. Where, most of the researches are trying to show authors perspectives in the finding results to show...
In an orthogonal frequency division multiplexing (OFDM) system, the performance is sensitive to the carrier frequency offset (CFO). This CFO will destroy the orthogonality between the subcarriers and cause intercarrier interference (ICI), which not only reduces the carrier to interference power ratio (CIR), but also leads to a phase rotation of the desired signal. In existing ICI cancellation schemes,...
In this paper, we consider a two-way relay channel (TWRC) network model in wireless bidirectional network, where end nodes have the full channel-state information (CSI) and relay nodes only have the channel-amplitude information (CAI). Our objective is to minimize the transmission power under the condition that the required transmission rates are satisfied. Different from previous works which assume...
Cognitive Radio (CR) is the next-generation wireless communication system that enables unlicensed users (or Secondary Users, SUs) to operate in white spaces, which are the underutilized licensed channels owned by the licensed users (or Primary Users, PUs), in order to address spectrum scarcity. Practical deployment of CR involves interactions among PUs, SUs, government (or the national spectrum policy...
Mobile Ad hoc Network (MANET) is a dynamic decentralized network consisting of randomly moving wireless Mobile Nodes (MNs) that cooperatively perform the routing discovery without specific user administration. Since in this network area each node moves in an arbitrary manner, the network topologies change frequently. In recent years availability of small, inexpensive low-powered GPS receivers and...
Ethernet Passive Optical Network (EPON) has gained the interest of many researchers nowadays as it is one of the best technologies to overcome congestion in the local loop between the customer and local exchange. Many network simulators exist in order to study EPON, but the simplest method to study EPON is using MATLAB. However, in order to study EPON using MATLAB, the traffics need to be generated...
In this paper, a computationally efficient jamming technique is developed for spectrally efficient communication system and the comparison is made with the jamming technique for power efficient communication system. Various aspects of jamming from the viewpoint of modulation techniques and its effect on the performance of communication system due to processed jamming versus unprocessed jamming are...
In this article optical code division multiple access (OCDMA) was chosen as multiplexing technique because it's considered as the next-generation optical access network. A multi premises downstream optical network was implemented using direct detection method based on OCDMA technique. The users encoded by modified prime code at C band with channel spacing 50 GHz. In this article low error rate transmission...
This paper proposes a new format-compliant perceptual encryption scheme based on the Multiple Description Coding (MDC). The proposed technique exploits the scalable property of MDC which results in multiple encrypted format-compliance video streams. An unbalanced MDC was specially designed to serve the purpose of perceptual encryption in such a way that it provides the control over quality differences...
This paper addressed the problem of decentralized and non-cooperative resource allocation among resource sharing base stations in multi-channel wireless access networks. Inspired by cohesion and adhesion properties of liquid form of matter, we propose a sophisticated yet elegant technique in ensuring near-optimal individual and overall utility of the resource shared base stations. While using game...
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