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Although Wireless Sensor Networks (WSNs) comprise one of the most rapidly evolving networking areas, in order to achieve significant widespread use, it is essential to provide tools enabling WSN users (especially the non-expert ones) to design, develop and deploy efficient WSNs with respect to specific requirements. Despite the importance of such objectives a significant lack is identified in the...
In the present work, we propose a practical RF propagation model - free-space outdoor model - suitable for WSN due to the fact that it considers the most important WSN constraints and RF signal propagation path loss factors. The model is based on combining four path loss factors, which cause distortion and weakening of the RF signal, i.e. free-space path loss, ground reflection path loss, RSS uncertainty...
This paper studies the MAC layer performance in demanding wireless sensor networks. The requirements for wireless MAC are discussed based on a prominent CSMA-based MAC protocol evaluation varying critical network parameters. The objective is to investigate the current radio access technologies suitability for wireless sensor networked applications. The channel access mechanisms are analyzed in more...
As wireless sensor networks (WSNs) are being developed for a wide range of application fields of real-time monitoring and control, a design overview seems important so as to investigate alternative communication aspects while treating the WSN as a whole system. As applications become more demanding the need to consider also deployment constraints and application particularities on top of the commonly...
As wireless sensor networks (WSNs) are being developed for a wide range of application fields of real-time monitoring and control, a design overview seems important so as to investigate alternative communication aspects while treating the WSN as a whole system. As applications become more demanding the need to consider also deployment constraints and application particularities on top of the commonly...
Deployment of senor nodes brings the challenging question on how to place the sensor nodes in order to achieve a particular coverage degree with optimum number of nodes. An important factor, which deployment process also should take into account is the radio signal propagation to guarantee reliable communication links among the network. In the present work, we firstly define a pre-deployment simulation...
As tracking applications for moving objects become more challenging, demands for accurate and reliable tracking methods using wireless sensor networked devices increase. The use of received signal strength (RSS) of the propagated signals, provided by most sensor radios, is the popular means of achieving such a task. Despite the great RSS variation, which may result in inaccurate estimation of the...
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