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We consider a single-input multiple-output (SIMO) multiple-access channel (MAC) multi-cellular communication scenario in which two base stations having a group of users each, are situated in two adjacent cells. In order to provide cooperative diversity at the base stations (BSs), multiple relays are used. Each group of users transmits information to its corresponding BS directly as well as via relays,...
In this paper, a secured dual-hop confidential communication system is considered. In which, a source transmits secret information to the destination in the presence of an interferer and an eavesdropper. And, multiple relays provide cooperative diversity at the destination. The interferer, source and relays are equipped with single antenna whereas the destination and eavesdropper are equipped with...
An Inset feed E-Shape Microstrip Patch Antenna has been developed and simulated for operation of Industrial, Scientific and Medical (ISM) band (2.40-2.52 GHz). The patch antenna is simulated using IE3D™ EM simulator (version 14.0) and optimized with an evolutionary stochastic optimizer i.e. Particle Swarm Optimization (PSO) technique. Optimized results show that the antenna is working in ISM frequency...
This paper deals with a transition between CPW and rectangular waveguide suitable in phased array antenna environment. In case of phased array antenna where the scan angles are very large, the sub array size gets reduced. Hence in such cases the feed element size becomes very small and the accommodation of active module comprising phase shifter and amplifier at the back side of the radiator is not...
In high-performance aircraft, spacecraft, satellite, and missile applications, where size, weight, cost, performance, ease of installation, and aerodynamic profile are constraints, and low-profile antennas may be required. Presently there are many other government and commercial applications, such as mobile radio and wireless communications that have similar specifications. To meet these requirements,...
A survey of the recent studies and findings on miniaturized, compact, low profile microstrip patch antennas (MSA) using metamaterials (MTMs) is presented. The MTM based theoretical and practical design techniques, and issues for RF and wireless communication systems have been investigated. Theory and principles of these electromagnetic artificial materials have been discussed in terms of physical...
This paper reports the design methodology of wideband corrugated horn antenna (1.8:1) at C-Band (Tx: 3.7-4. 2 GHz, Rx: 5.9-6.7 GHz). This paper discusses in detail various sections of horn design. i. e. input taper, mode converter, transition section, and output flare. It brings the comparison of analyzed and measured results. The measured return loss is better than 22.9 dB over C-transmit band, better...
This paper presents the design and development of sequentially rotated broadband circularly polarized stacked patch array antenna for data & voice communication in MSS service. A Sequential rotation technique is used for improvement in axial ratio in 2 times 2 array environment. The driven element is Electromagnetically Coupled square patch with dual edges fed by T power divider. A parasitic patch...
Very recently (since 2001), the emerging metamaterials (MTMs) have created new hopes for the upcoming technologies such as nanotechnology, bioengineering, artificial-sense-intelligence and wireless, optodigital communication systems. Based on our study we have presented the in-depth conceptual understanding of electromagnetic properties, high frequency responses and potential applications of the new...
Photovoltaic (PV) water pumping systems have been increasingly popular in remote areas where grid is not accessible or is too costly to install. These systems are mostly used for agriculture and household purposes. Generally, such systems use permanent magnet dc motors because of their simple circuit configuration and control strategy. However these systems require frequent maintenance. On the other...
With large influx of freshwater that decreases sea-surface salinities, weak wind forcing of <10 m s−1 and almost always warm (>28°C) sea-surface temperature that stratifies and shallows the mixed layer leading to low or no nutrient injections into the surface, primary production in Bay of Bengal is reportedly low. As a consequence, the Bay of Bengal is considered as a region of low biological...
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