The research, examining the signal strength of radio waves travelling over the sea, identified late afternoons and early evenings in spring and summer as a time when enhanced signals occur.
The research by Salil Gunashekar was part of his Doctoral studies at the University of Leicester’s Department of Engineering and has yielded results that have implications for the design of cellular telephone networks operating in marine and coastal regions
Dr Gunashekar, who is now a Post-Doctoral Research Associate in the Radio Systems Research Group, said: “In today's world, radio waves are an indispensable means of communicating information 'without wires' from one place to another, be it for radio broadcasts or cell phones, television transmissions or airport radars.
“When radio waves travel for long distances over the sea their strength can be affected by the weather. The constantly changing weather conditions over the sea mean that marine and coastal environments, in particular, are prone to unusual atmospheric phenomena that enable radio waves to travel longer distances and have higher strengths than expected.”
On Wednesday 4th June, in the fourth of the series of Doctoral Inaugural Lectures, Dr Gunashekar will present the key findings of his Ph.D. research in which he conducted a detailed theoretical and experimental investigation of the propagation characteristics of over-sea radio communications.
Specifically, between August 2003 and August 2005, three long-range radio paths operating at a frequency in the ultra high frequency band (UHF: specifically 2 Gigahertz) were established in the British Channel Islands. This frequency is of particular importance since it is used by many mobile phones. The relationship between specific over-sea propagation mechanisms and signal strength distribution patterns in a temperate region such as the English Channel have been examined, modelled and correlated with meteorological parameters.
Dr Gunashekar said: “Interestingly, signal strength enhancements have been observed on all three radio paths, predominantly in the late afternoon and evening periods, in the spring and summer months. During these periods, which occur only approximately 5-10% of the time, the influence of higher-altitude radio wave ‘trapping’ structures has been verified.”
The research conducted in this investigation is expected to have implications for the design of cellular telephone networks operating in marine and coastal regions, as well as other maritime communication systems such as those used in commercial shipping and sea-rescue operations, and is all the more applicable to the United Kingdom because of its extensive coastline.
Salil Gunashekar is a Post-Doctoral Research Associate in the Radio Systems Research Group (Department of Engineering) at the University of Leicester, UK. He is currently working on a project that is experimentally investigating the feasibility of utilising multiple-input multiple-output (MIMO) techniques within the High Frequency radio band. The project is concerned with the application of modern antenna technology to this radio band with the aim of delivering increased data rates.
Salil completed his Ph.D. from the University of Leicester in November 2006. During his Ph.D. research, a detailed experimental and theoretical study of the long-range, over-sea propagation of 2 GHz radio waves in the British Channel Islands was conducted. The various issues that were investigated are of direct relevance in the planning of radio communication systems operating in the UHF band (e.g. GSM and UMTS) in marine and coastal regions.
Salil also completed an M.Sc. in Information and Communications Engineering from the University of Leicester in 2003. Before coming to Leicester, he did an M.Sc. in Informatics from the University of Delhi, India (2002). In 2000, Salil graduated with an honours degree in Physics from St. Stephen’s College, University of Delhi.
Ather Mirza | alfa
The Great Unknown: Risk-Taking Behavior in Adolescents
19.01.2017 | Max-Planck-Institut für Bildungsforschung
A sudden drop in outdoor temperature increases the risk of respiratory infections
11.01.2017 | University of Gothenburg
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences