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In wireless ad hoc networks, hidden nodes has been an important topic of recent research. This paper proposes a novel and efficient distributed multi-channel assignment algorithm, Virtual Sieve Distributed Channel Assignment Algorithm (VSDCA), for wireless ad hoc networks to avoid hidden node problem. The main purpose of this algorithm is to guarantee all links with hidden node problems to be assigned...
Gene temporal expression data clustering has been widely used to study dynamic biological systems. However, most temporal gene expression data often contain noise, missing data points, and non-uniformly sampled time points, which imposes challenges for traditional clustering methods of extracting meaningful information. To improve the clustering performance, we introduce a novel clustering approach...
Green ICT (Information and Communication Technology) is a new focus with the goal of saving energy by optimizing mobile network communications and ultimately protecting the natural climate. Here we consider the design of vehicular ad-hoc networks (VANETs) to reduce energy consumption due to communications. Based on a realistic transport traffic scenario on a motorway, rdquoM4rdquo in UK, this paper...
Nodes in energy-efficient ad-hoc wireless networks can benefit more of new ad-hoc services, as well as, can support better new emerging ad-hoc applications. In this paper we introduced a method that can be used to select the optimum location of relay nodes, and derived the range of relay node location that results in energy saving. The optimal node transmission range is derived in terms of the propagation...
Most nodes of ad-hoc wireless networks are battery-powered, therefore energy efficiency is an important concern in ad-hoc networks. Most transmission and energy consumption models in ad-hoc wireless networks assume an ideal physical layer model, where the probability of the packet being received by the neighbour is 100% once the neighbour node is within the transmission range of the transmitter. In...
Geographic Routing (GR) algorithms are increasedly studied in ad-hoc wireless networks, and energy efficiency is of particular interest. Among the existing GR algorithms, the Most Forward within Radius (MFR) algorithm selects the next hop node as far as possible from the source node to minimise the network delay time while the energy consumption is not considered. The Nearest Forward Progress (NFP)...
Wireless ad hoc networks operation is constrained by energy consumption of every network nodes. To this end, this paper, based on Geographical Adaptive Fidelity (GAF) topology management protocol, analyzes the energy consumption in a rectangular ad-hoc wireless network. Three GAF models for energy efficiency are introduced and discussed: equal-grid, adjustable-grid and genetic algorithm models. In...
Nodes in energy-efficient ad-hoc wireless networks can benefit more of new ad-hoc services, as well as, can support better new emerging ad-hoc applications. In this paper, we introduce an approach to achieve the energy efficiency based on both optimal transmission range and topology management of ad-hoc wireless networks. We derive the relationship between the optimal transmission range (optimal grid...
Network lifetime is one of the most important parameters in ad-hoc wireless networks, and it is not only constrained by the battery capacity of the nodes in the networks but also by the energy efficient operation of the nodes. This paper evaluates energy consumption and network lifetime in a rectangular network model based on the Geographical Adaptive Fidelity (GAF) topology management protocol. We...
A new architecture of two-hop-relay variable-rate cellular system was introduced, and the analytical model of this system was built. Then based on this model, we get the average downlink throughput and the call blocking probability of the system respectively. Finally, through numerical calculation, we analyze the impact of the various parameters on the performance of the two-hop-relay variable-rate...
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