Low Earth Orbit (LEO) satellites are used for public networking and for scientific purposes. Communication via satellite begins when the satellite is positioned in its orbital position. Ground stations can communicate with LEO satellites only when the satellite is in their visibility region. The duration of the visibility and the communication vary for each LEO satellite pass over the station, ...

The transition in random fiber networks from two-dimensional to three-dimensional planar structure driven by increasing coverage (total fiber length per unit area) is studied with a deposition model. At low coverage the network geometry depends on the scale-free product of fiber length and coverage while at high coverage it depends on a scale-free combination of flexibility, width and thickness...

Covering a bounded region with minimum number of homogeneous sensor nodes is a NP-complete problem [7]. In this paper we have proposed an id based distributed algorithm for optimal coverage in an unbounded region. The proposed algorithm guarantees maximum spreading in O( √ n) rounds without creating any coverage hole. The algorithm executes in synchronous rounds without exchanging any message. ...

Manuscript received 5-Nov.-2014 and revised 25-Jan.-2015, P-ISSN: 2322-4088 Accepted on 16March-2015 E-ISSN: 2322-3936 Abstract— From practical and theoretical viewpoints, performance analysis of communication systems by using information-theoretic results is important. In this paper, based on our previous work on Multiple Access Channel (MAC) and Multiple Access Relay Channel (MARC), we analyz...

Monitoring the long-distance pipelines, rivers, roads and boundary lines with wireless sensor networks belongs to one-dimensional region monitoring. This paper primarily studies the coverage problems of the sensor networks in one-dimensional regions. Firstly, the onedimensional random coverage model is processed for the sensor nodes in one-dimensional monitoring region, and a formula is given t...