The present work deals with the dynamic placement of a set of pursuers and a set of relay devices so that the mean distance to a set of moving targets is minimized along a given period of time. The relay devices are here in charge of maintaining the communication between the pursuers. Moving targets, relay devices and pursuers are limited in their movements from one period to the next. The peri...

A novel bit-detect-and-forward (BDF) relaying scheme based on repetition coding with the relay is proposed, significantly improving the robustness to impairments proper to free-space optical (FSO) communications such as unsuitable alignment between transmitter and receiver as well as fluctuations in the irradiance of the transmitted optical beam due to the atmospheric turbulence. Closed-form as...

Wimax is a standard based wireless technology that provides high throughput broadband connection over long distance. It can offer low cost high speed and long range communications for applications. In wimax relay networks the relay stations are used to improve the transmission quality. Bandwidth allocation is the process of assigning bandwidth to users and applications. The comparative analysis...

In wireless sensor network routing protocol design and energy savings optimization is important because most of times nodes are in moving condition and deployed in remote area. This work focuses on minimizing energy consumption and maximizing network lifetime for data relay in one-dimensional queue network. An Energy Saving via Opportunistic Routing (ENS_OR) algorithm is designed to ensure mini...

IEEE 802.16 is a Broadband Wireless Access (BWA) network and thus it is considered to be an alternative solution to wired broadband technologies. Relay station plays a promising role of extending the range of Base station for long distances in WiMAX networks. Relay station is suitable to areas with limited infrastructure such as rural, hilly and lakes, where it is difficult to install many Base...

Cascaded tripping of power lines due to mal-operation of zone 3 distance relays was one of the main causes of many previous blackouts worldwide. Encroachment of load into the zone 3 characteristics is one of the main cause for the maloperation of the relays. By improving the operation of zone 3 of distance relays it is possible to prevent such mal-operations so that cascaded line tripping can b...

The modern power system is equipped with protection based on advanced technology through the use of digital multifunction relay, control and intelligent selectivity, whose purpose to ensure maximum security service continuity relay in presence various fault currents. Distance an important required high voltage transmission lines. In this paper, experimental platform tests have been performed pr...

This paper introduces three coding strategies for using the Luby Transform (LT) code in a relay aided power-line communication scheme. In the first method, the relay decodes the received packets and re-encodes them for transmission towards the destination. In the second method, the relay only forwardes a random linear combination of its received packets towards the destination, while in the thi...

User cooperation is a communication strategy where transmitting users share their resources to help each others’ transmission for reliable delivery of their message at destination. Multiple-access-channel with Dedicated-relay (MAC-DR) is a MAC channel, where there are more than one transmitters, single receiver, and a fixed or dedicated node which act as a relay for transmitting users. In this ...

In this study, we introduce a new two-way relay channel and obtain an inner bound and an outer bound for the discrete and memoryless multiple access relay channels with receiver-source feedback via two-way relay channel in which end nodes exchange signals by a relay node. And we extend these results to the Gaussian case. By numerical computing, we show that our inner bound is the same with o...