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Generally in practice there are Optical Fiber, Waveguides, Satellite Communication, Coaxial Cable and copper Wire which are utilized by the heterogeneous and homogeneous networks to offer wider range of data and voice communication to the end users. In future as the demands for bandwidth increases for the purpose of communication, this results into imbalance of the traffic load. To provide addition...
Heterogeneous wireless sensor network (HWSN) consists of sensor nodes with different ability, such as computing power and sensing range. Compared with homogeneous wireless sensor network, the design of protocols for such networks has to be more complex due to the energy constraint in order to prolong the lifetime of the network. As energy consumption mostly comes from the radio transmissions, bandwidth...
The dissemination of information in wireless networks is a fundamental aspect in several network processes, such as routing, monitoring and management. Nowadays, most of the techniques for dissemination of management information adopt controlled flooding approaches, which usually impairs the network performance. In this sense, the optimization of the dissemination of management information for dense...
Distributed systems have rapidly changed the face of Internet Technology. Web syndication is a competitive collaborative content delivery system over the cloud, which refers to making web feeds/ material available from a site to other people with a summary of the website's content including the recent updates. The relevance of web syndication has been remarkable in the fields of e-Governance, e-Commerce...
On the basis of ranged-based methods, in this paper, we will raise a ranging method of TOA (Time of Arrival) based on ultra-wideband (UWB) communication technology. UWB signal have many beneficial characteristics such as good confidentiality, strong penetrating ability, high positioning accuracy and low power consumption. However, for the application of the node localization, UWB direct signal is...
The goal of our research is to improve data availability in large-scale wireless networks in a disaster scenario, where spatially correlated group of nodes may fail. In this paper, we analytically evaluate the efficacy of existing replication schemes from structured overlay networks under relaxed system constraints. The analysis shows that these schemes do not guarantee data survivability under the...
We focus on an opportunistic communication system consisting of multiple independent channels with time-varying states. With limited sensing, a user can only sense and access a subset of channels and accrue rewards determined by the state of the sensed channels. We formulate the problem of optimal sequential channel probing as a restless multi-armed bandit process, for which a powerful index policy-Whittle's...
We propose a novel distributed cross-layer optimization approach for cognitive radio wireless networks. A cognitive radio is a wireless device that is capable of sensing the prevailing environmental conditions and automatically adapting its operating parameters in order to enhance the performance of both the system and potentially the whole network. Given the lack of a centralized intelligence to...
The underwater target localization problem is one important application for underwater acoustic sensor networks. This paper, based on "underwater acoustic transmission theory", solves the target localization problem. The proposed algorithm firstly studies the principle of underwater acoustics and applies it to set up the model of underwater signal energy transmission. According to the model,...
The increasing ubiquity of mobile embedded systems has been matched by the evolution of a variety of wireless network standards and technologies. The major constraints of wireless embedded systems are limitations of communication bandwidth, processing capabilities, and battery power. Remote wireless embedded systems often act as sensors, which provide data to a certain community. The exchange of data...
In this paper, we introduce a pricing model that ensures efficient resource allocation that provides guaranteed quality of service while maximizing profit in multiservice networks. Specifically, a dynamic allocation policy is examined that relies on online measurements while each service class operates under a probabilistic bound delay constraint. We present a rigorous analysis of the properties of...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
This paper discusses the performance of the wavelet based filtered multi-tone (WFMT) modulation. The novel WFMT modulation was proposed in 2003 for improving characteristics of wireless and DSL multicarrier systems. In this paper we describe a main idea of WFMT and discuss the advantages of this novel modulation. The WFMT modulation in comparison with OFDM and DMT has low level of out-of-band side...
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