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The communication range of underwater acoustic networks (UAN) is limited by the properties of underwater environment. Especially, the networks including small number of nodes have communication problems for long ranges. To challenge this problem, topology control in UAN is a promising solution. In this study, Topology Control Vector Based Forwarding Algorithm (TC-VBF) is proposed. The TC-VBF uses...
The performance of a dual source cooperative multi-hop network is investigated, where linear network coding technique is used by the intermediate nodes to combine and forward the information of two sources. A strip-shaped network is considered where each hop is characterized by a square region in which the nodes are randomly deployed that transmit the information of two sources to a common destination...
Topology structure for UAWSN has to be of general characters of WSN not only, but also consider the limited communication range and cell energy, the effect of single damaged cell to the whole network and so on. This paper analyzes the energy efficiency for UAWSN theoretically and then presents the simulation results for square and triangle topology structures with different network scale. All these...
This paper proposes a routing algorithm that enhances a network lifetime and decreases an end-to-end latency for industrial wireless sensor networks (IWSNs) based on ISA100.11a standard. The proposed algorithm can be applied to large-scale networks where data is conveyed by multi-hop forwarding scheme from source nodes to the sink. By estimating a residual energy and a packet reception rate (PRR)...
Given the ever-increasing popularity of wireless body area networks (WBANs), in some application scenarios, many WBANs may operate densely and lead to a high mutual interference. Excessive interference may severely degrade the network performance, which is called the network co- existence problem. It is critical to fully understand the network co-existence problem to ensure the effectiveness and efficiency...
Recently, collaborative (or cooperative) multi-hop transmissions have gained much attention since they can achieve highly reliable communication and longer life of each node simultaneously. While it is often assumed that each cluster in collaborative multi-hop transmissions has an identical number of nodes in the literature, this assumption is not reasonable since the sensor nodes are not uniformly...
In wireless sensor networks (WSNs), a significant amount of packets are lost when transmitted over wireless links, leading to unnecessary energy expenditure. This lossy property of a link can be described by the packet reception ratio (PRR) over it. In the literature, it was shown that the PRR of a link is a non-decreasing function of its signal to interference-plus-noise ratio (SINR), which indicates...
We consider a multi-relay amplify-and-forward cooperative communication scheme in wireless sensor networks with uniformly distributed nodes. Fixing the average total transmission power from the network and preserving fairness among the selected relays by constraining them to transmit with equal average powers, we aim to improve the signal reception quality at the far-field receiver by means of a proper...
Wireless sensor networks demand the implementation of energy-aware transmission protocols. Recently, cooperative protocols have been suggested for use in sensor networks since they typically require less transmit power than the direct transmission for the same error probability. For sensor networks with short range transmissions, however, the energy consumed in receiving transmissions from cooperative...
In this paper, serial distributed detection under node failure for wireless sensor networks is studied. All previously suggested distributed detection algorithms for wireless sensor networks assume sensor nodes are completely functional. However, sensor nodes are vulnerable to failure for variety of reasons. Hence, node failure tolerant algorithm design is crucial to provide robustness to system under...
Body Area Networks (BAN) offer amazing perspectives to instrument and support humans in many aspects of their life. Among all possible applications, this paper focuses on body monitoring applications having a body equipped with a set of sensors transmitting in real-time their measures to a common sink. The underlying network topology is a star topology which is quite usual in the broad scope of wireless...
In wireless sensor networks, the limited energy of the nodes should be utilized in such a way that the performance measure of the sensing application is optimized. In this paper, power-aware design of IR-UWB sensor networks for distributed signal detection is discussed. The design approach consists of two parts which aim at minimizing the global probability of detection error. First, an application-specific...
Knowledge of node locations is desired in many types of wireless sensor network (WSN) technologies. Cooperative localization has been proved to provide self-calibration in the WSN even in presence of sparse reference nodes and noisy range estimates, as it relies on redundancy exploiting all the available inter-node measurements. In this paper we consider cooperative localization based on time-of-arrival...
The relay selection problem in a large wireless sensor network (WSN) with uniformly distributed identical nodes is investigated for a two-phase cooperative protocol where the signal transmitted from a single source is overheard by the network and is then relayed by multiple selected nodes subject to a total average transmission power. First, a relay selection technique is considered that maximizes...
This paper analyzes the use of link quality, based on the signal to noise ratio, as a metric to improve routing in multi-hop wireless networks. We compare the behavior and performance with those of other approaches, namely a simple minimum-hop selection process, as well as the expected transmission count (ETX) metric, which has recently gathered relevant attention from the scientific community. We...
To extend the lifetime of wireless sensor networks a power-aware design of the communication units is required. This can be accomplished by employing power-controllable impulse radio ultra-wideband (IR-UWB) transceivers. In this paper, two distributed power control algorithms are suggested that are based on a variation of IR-UWB specific parameters. The iterative algorithms converge to the optimal...
Cross-layer design for wireless networks aims at optimizing system-wide performance measures by exploiting dependencies between different network layers. In this paper, an opportunistic power assignment algorithms for IR-UWB sensor networks is presented that is especially designed for distributed signal detection under resource constraints. Specifically, the objective is to minimize the global probability...
The paper proposes an approach of optimizing transmit power in wireless sensor networks with random topology in order to prolong node lifetime. It defines optimal transmit power as the minimum transmit power used by all nodes necessary to guarantee end-to-end bit error rate (BER) requirement. Assuming Rayleigh fading channels and two- dimensional Poisson topology, we bring nearest with forward progress...
What is the fastest rate at which we can collect a stream of aggregated data from a set of wireless sensors organized as a tree? We explore a hierarchy of techniques using realistic simulation models to address this question. We begin by considering TDMA scheduling on a single channel, reducing the original problem to minimizing the number of time slots needed to schedule each link of the aggregation...
Network coding is known to improve throughput by mixing information from different flows and conveying more information in each transmission. Recently some proposals have demonstrated the benefits of applying network coding to wireless networks with broadcast transmissions. It is expected that the opportunities for coding and the corresponding gains depend on the bit-rate chosen for determining routes...
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