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Communication and data transfer demands are growing fast in last few decades. In order to obtain higher data transfer, it is necessary to determine proper antenna placement in a wireless system. In this paper, we research propagation in tropical environment and L-Band frequency by conducting distance and high variation measurement at frequency 1.8 GHz and 2.4 GHz. The received power level decreases...
This paper is dedicated to the study of the functioning of wireless sensor networks under electromagnetic interference. As a result of electromagnetic interference, there is a degradation of channel quality down to interruption of nearby nodes, which leads to disruption of route. To maintain the stability of the network operation, a sensory field map is built based on RSSI measurements and an alternative...
Wireless Sensor Networks (WSN) are good field for research which can be applied almost in any area and in any circumstances. The traditional LEACH protocol is considered for the research and in this work the Improved LEACH is introduced as an energy efficient Cluster Head (CH) selection considering the energy and distance as parameters. The probability function is modified with the energy and distance...
Over the years, different types of relay selection mechanism in wireless networks have been proposed for Cooperative Medium Access Control (MAC) protocols considering the metrics like — residual energy, delay, signal to noise ratio (SNR) etc. In recent days, distance metric is added to the list for optimal relay selection. However, protocols those use distance metric are found to be suffered from...
WBAN is a network of miniature biomedical sensors centered as implantable, wearable and around the human body to measure various physiological parameters in real time. Due to a resource-constrained nature of WBAN, a number of challenges have emerged. The prominent being the energy efficiency issue, which has been tackled in our work. Our research work concentrates on two operations i.e. clustering...
Beacon allows Bluetooth [1] devices to broadcast and receive tiny information within short distance, which consists of two parts: a broadcaster (beacon device) and a receiver (smartphone app). So, it is being widely used in URL (Uniform Resource Locator) broadcast, distance measurement, localization etc. However, because of its deviation, measured distance value is not always accuracy. In this paper,...
The device-to-device (D2D) distance-based service is affected by distance between the D2D devices. Thus, the wireless distance measurement between devices is an indispensable technology in D2D applications. When mobile devices use the distance between D2D devices in the D2D application, the distance should be measured easily and accurately. Several methods can be used to measure the distance between...
Mobility is one of the basic features that define an ad hoc network, an asset that leaves the field free for the nodes to move. The most important aspect of this kind of network turns into a great disadvantage when it comes to commercial applications, take as an example: the automotive networks that allow communication between a groups of vehicles. The ad hoc on-demand distance vector (AODV) routing...
Vision system could enhance the mobile robot applications and features. However, the vision system could also improve the overall system of mobile robot so as to contain higher complexity with the purpose to be reliable, effective, robust and fast enough to achieve their goals. This paper will present a simple yet reliable monocular vision system in the mobile robot to increase their capabilities...
This paper proposes a method of real-time seamless location cognition in WLAN systems based on monitoring, learning and recognizing the statistics of received data traffic. It uses the property that statistics such as average and variance of throughput are often correlated with the location. The method also uses a confidence parameter to quantify the confidence in the location identification, based...
Recently years research on wireless sensor networks (WSN) paid more attention to solve the localization of the wireless sensors, different algorithms had been applied, one of them is DV-Hop, which still need to be improved to obtained better position accuracy. In this paper, we propose a strategy to get accurate location from the unknown sensor using the average hopsize and average error reducing...
In this paper, we present a new distance and velocity assisted handoff decision algorithm (DVAH). By sampling the received power from base station (BS) continually and with the beforehand downloaded base station coverage radius and some propagation parameters, the mobile terminal (MT) can estimate the distance and the leaving velocity from surrounding BSs. By the assistance of the estimated distance...
In todaypsilas modern wireless ZigBee-based modules, there are two well-known values for link quality estimation: RSSI (received signal strength indicator) and LQI (link quality indicator). In respect to wireless channel models, received power should be a function of distance. From this aspect, we believed that RSSI can be used for evaluating distances between nodes. The experiment described in this...
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