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Cooperative diversity has gained much interest due to its ability to mitigate multipath fading without using multiple antennas. There has been considerable research on cooperative transmission discussing how cooperation can improve the performance of the physical layer. During the last few years, researchers have also started to take into consideration cooperative transmission in routing. However,...
Cooperative communication uses spatial diversity to mitigate multipath fading. With an appropriate assignment of partners it also decreases the energy expenditure of the network. Together with optimum transmit power allocation, it is a useful technique to overcome the energy constraint problem in wireless sensor nodes. The calculation of optimum power in a Rician fading channel is a computationally...
Even though the wireless positioning in sensor networks has been extensively studied in the past decades, there is no contribution discussing positioning the receiver that belongs to another system, i.e., the third-party receiver. In this paper, we propose a new scheme to solve the problem by full-duplex rtechnique. In our scheme, we let the sensors conduct the full-duplex relay for the target receiver...
In practical underwater wireless optical communications (UWOC), pulse modulation technique has been widely used due to the high optical power efficiency and relatively low system complexity. Compared with the simplest on-off keying (OOK) scheme, digital pulse interval modulation (DPIM) improves both power efficiency and error performance and requires no symbol synchronization. Polarization shift keying...
Beamforming has been used in wireless sensor networks (WSNs) to increase the communication range of sensor nodes. These works investigate the beamforming performance using the theory of random arrays, and aims to achieve maximum transmitting power. Since the relative positions of sensor nodes and frequency/spatial response are generally unknown, it's also referred to as blind beamforming. In this...
In this paper, cooperative spectrum sensing based censored energy detection is considered in order to improve the accuracy of the decision made about the spectrum availability. Proposed two witnesses fusion rule is used to derive a spectrum sensing final decision. However, the accuracy of this decision cannot be ensured unless the best choice of the two decision thresholds is made such that the probabilities...
In this paper, a method for node localization in a novel small world - wireless sensor network (SW-WSN) is proposed. A SW-WSN is created by introducing small world characteristics into a conventional wireless sensor network (WSN). Introduction of long-ranged links between selected nodes in a WSN reduces average path length (APL) of the network without affecting the clustering coefficient (CC) significantly...
The recent advance in radio frequency (RF) energy transfer has enabled wireless-powered communication (WPC), where wireless devices are powered by dedicated wireless energy transmitters. In this paper, we study a WPC scenario consisting of one access point (AP) and one user. The user is assumed to have no embedded energy supply and need to harvest energy from RF signals broadcast by the AP. Different...
The backscatter communication system has tremendous potential in commercial applications, still very less work has been done to study the benefits of it. Backscatter communication system is the backbone of many low cost and low power distributed wireless systems. The data transmission between various nodes in wireless communication system always comes with the risk of third party interception. This...
Extended network lifetime and load balancing are important requirements for many WSN applications. There are many clustering routing schemes for homogeneous proactive and reactive WSNs but they suffer from the problem of uneven load distribution and back transmission. This paper presents an energy efficient load balanced clustering scheme with away cluster head (ACH) scheme and free association mechanism...
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...
Scarcity of the radio frequency spectrum available for use by the vast number of wireless devices is already a challenge faced by ubiquitous communication networks, including the Internet of Things. The Cognitive Radio (CR) technology provides promising solutions to address part of such challenges. CR is based on allowing the so-called holes, the spectrums that remain unoccupied by their licensed...
In this paper, we examine, via analysis, the improvement in device localizability through collaboration. Depending on the sensitivity of the receivers in the devices, it is not unusual for an unlocalized device to lack a sufficient number of detectable positioning signals from localized devices to determine its location without ambiguity (i.e., to be uniquely localizable). This occurrence is well-known...
This paper deals with the performance evaluation of a cognitive overlay wireless sensor network relying on a low complexity spectrum sensing technique. In particular, the paper proposes a dynamic channels selection policy in order to improve the performance of a IEEE 802.15.4e sensor overlay network. Further, the paper proposes a suitable analytic model to carry out a performance evaluation analysis,...
Energy efficient routing protocol design in the presence of noise and interference is a challenging task in wireless sensor networks (WSNs). In this paper, we present a robust, energy efficient multi-path routing protocol that uses the residual energy and Signal-to-Noise Ratio (SNR) to predict the best next hop node during the route establishment. The new protocol uses multi-path to transmit the data...
In Clustered-Underwater Wireless sensor networks (CUWSNs), battery operated sensing devices are grouped and connected with each other through wireless interfaces. Energy and processing efficiency are the two important parameters in these systems. CUWSNs with reduced number of transmissions utilize less energy and prolong the lifetime of the network. In this paper, a new protocol is proposed which...
Over the past few years, wireless sensor network (WSN) systems have been expanded rapidly due to the decreasing size and cost of sensor devices as well as the advances in wireless communication technologies. In this paper the impact of directional antennas on energy efficiency and reliability of WSN systems is investigated. The WSN performance using directional antennas is compared to the reference...
IRAN is located in a region of high seismic potential. This paper presents a real-time method of predicting earthquake before its arrival. Our proposed method is based on cross-correlation calculation of data sensed by Wireless Sensor Network (WSN) as well as, Transfer Function (TF) calculation for the seismic wave propagation path between a location close to the hypo-center and the location where...
The paper is focused on the use of methods of compressed sensing (CS) in energy efficient monitoring of signals. CS allows to minimize the number of data that need to be transmitted to the sink node in the WSN environment. As a case study, we use compressed sensing for monitoring of mains voltage deformation. In this case we can assume that the measured signal is sparse in frequency domain and using...
The ability of wireless terminals to harvest energy from Radio Frequency (RF) signals is gaining tremendous momentum as a mean to prolong the lifetime of these terminals and to recycle the radiated energy. This article gives a much needed statistical analysis for the amount of harvested energy over a period of time $T$. By studying the input/output characteristics of a typical harvesting circuit,...
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