The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The protection of busbar demands high integrity and high speed relaying scheme. This paper presents a new differential relaying scheme for the protection of busbar. The proposed scheme depends on the difference of the value of incoming and outgoing line currents of the respective phase at a particular bus. The proposed scheme has been tested extensively using the PSCAD/EMTDC software package with...
It is known that some transient events are too difficult to be detected immediately; especially high impedance faults, faults that occur at zero-crossing voltage and faults in the relay proximity. A novel approach for detecting transient events and wave distortion, based on Principal Component Analysis is presented. The proposed algorithm is easy to implement and is not time consuming. It only requires...
Mobile devices location systems for remote objects are increasingly used today by several enterprises. Many systems use positioning devices such as GPS and communication devices to send remote location data. These systems suffer from many constraints related to the precision of the location at any point of time, the availability of specified devices, their high cost and the periodical expensive use...
Fault tolerance is a key element for reliable data delivery in practical applications of wireless sensor networks (WSNs). Sensor node failure can be caused by many reasons including environmental effects, transmission link instability, failure of hardware component and battery drainage. Fault tolerance is of particular interest in multi-tier heterogeneous networks where relay nodes are used to transport...
One of the key enhancement elements of next generation LTE networks is the deployment of relays. Relays provide added performance gains in the form of enhanced coverage for mobile UEs situated in poor coverage areas. Relays provide coverage gains in high shadowing areas and also help reduce power consumption at the UE terminal by enabling a better communication channel. A striking aspect of relays...
In this paper, we investigate the performance of a single-relay assisted cooperative vehicular network in a highway traffic scenario. Source and relaying vehicles are assumed to be traveling in the same direction with similar speeds. This results in a relative velocity nearly equal to zero and leads to a frequency-flat and time-flat fading in source-to-relay link. On the other hand, source-to-destination...
This paper presents a new scheme for demodulate-and-forward two-way relaying scheme based on Alamouti code. Two nodes, A and B, employ Space-Time Alamouti code to transmit their messages to each other through relay node (RN). The RN receiver uses Minimum Mean Square Error Successive Interference Cancellation (MMSE-SIC) to separate signals originating at nodes A and B. The RN transmitter applies XOR...
Traditional techniques and technologies for water management will no longer be cost effective or efficient in meeting the demands and challenges of the coming years. In this paper we describe Aqua-Net, a wireless sensor networks (WSNs)-based architectural framework for an efficient and reliable water management application. We identify areas of research that we are currently engaged in. The proposed...
In this paper two novel methods for using network coding in the cooperative networks have been proposed. In the first scheme, network coding generates some redundancy in addition to the redundancy that is generated by the channel code. These redundancies are used in an iterative decoding system at the destination. In the second scheme, the output of the channel encoder in each source node is shortened...
We consider a coded cooperative relaying scheme in which two sources communicate with a destination with the assistance of a relay when necessary for improved bandwidth efficiency, reduced energy consumption and enhanced system performance. Based on the decoding status of source signals, the destination decides whether to ask the relay for help. Also, the relay can refuse the destination's request...
In this paper we investigate the combination of Adaptive Modulation and Coding (AMC) and Hybrid Automatic Repeat reQuest (HARQ) techniques in an orthogonal cooperative scheme using infra-structured (fixed) relays. We consider realistic large scale and small scale path loss models, taking into account the antennas heights and the presence or not of line of sight (LOS). Results demonstrate that large...
In recent years network coding has emerged as an innovative approach to disseminate information in wireless networks. It is generally believed that by using network coding considerable amount of energy could be saved. However, in case of wireless sensor networks, significant challenges such as unreliable data transmission, limited transmission power of sensor nodes, external interference limit the...
In this paper, we consider a communication system employing a relay equipped with multi antennas. The relay transmits a linear transformation of its received signal vector to the destination node. We study the design of Relay Transformation Matrix (RTM) by maximizing the average and instantaneous SNR at the destination assuming a limited relay transmit power. To achieve the full multiplexing of such...
Co-operative relay is emerging technique for 3G/4G high bandwidth networks in order to improve the capacity of edge nodes. As the deployment cost is high, there might be a few number of relay nodes in the cell which can help the edge nodes to transmit their data. From this perspective, one of the key problems for a relay node is to make decision which edge nodes to help and how much resource need...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.