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Electronic communication system i.e. the radio wave propagation is completely depends on the medium. The signals of LF and VLF are rapidly alternated by the earth's surface. The medium and short wave signals are also affected by troposphere and ionosphere conditions. The line of sight propagation depend both the troposphere condition and ground conductivity. There are various propagation models currently...
Summary form only given. Convergence of communication and computing technologies is rapidly changing the requirement of wireless devices. While wireless wide area network (WWAN) based on cellular radios was evolving, a new set of wireless LAN networks which are fundamentally different from cellular networks emerged. Devices for applications in the wireless LAN networks (WLAN), wireless personal area...
In this paper the analysis and design of compact CPW-fed slot antenna that operates in the IEEE 802.11a frequency band from 5.15 GHz to 5.35 GHz for wireless applications through a single grounded coplanar waveguide port for achieving sectorized radiation pattern is presented. The antenna is designed on a RT/duroid 5880 substrate with a permittivity 2.22 and with the size of 18.8 mm times 12.3 mm...
This communication presents an overview of the research work carried out related to microstrip antenna technology and Computational Electromagnetics in the Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi over the last few years. The communication also presents the identified areas of the research in the related field and discusses the various computational,...
In this paper, a smart adapter for seamless transmission of IP packets between end to end systems over an error prone half duplex wireless link is proposed. The performance of TCP/IP reduces over wireless links as TCP is basically designed to handle packet loss due to congestion rather than due to high error rates. Performance of half duplex wireless link has been improved using smart adapter.
Summary form only given. Most existing, emerging and proposed industrial, scientific and medical applications of microwave energy are briefly discussed. Advantages in using microwaves in above applications are given. The proposed use of microwave technology as a clean and ecofriendly technology when used for transportation of solar energy from a geostationary satellite to earth, and detoxification...
For WLAN applications frequency synchronization is one of the most important issues. The preamble allows the receiver to use efficient maximum likelihood algorithms to estimate and correct for the frequency offset, before the actual information portion of the packet starts. In order to increase the performance and provide frequency synchronization in orthogonal frequency-division multiplexing systems,...
The design of a triple-band planar monopole antenna is proposed. This antenna covers IEEE 802.11a, 802.11b, and 802.11g WLAN bands. Since the antenna is printed on a substrate, it can be easily integrated with the associated microstrip circuits lying on the same plane of the substrate. The antenna has been designed by using IE3D, a full wave MoM simulator from Zeland, USA. The characteristics of the...
In this paper an improved and modified interleaver design based on the code distance spectrum is proposed. The low weight paths in the code trellis which give large contributions to the error probability in the signal-to-noise ratio region of interest for practical communication systems are eliminated, so that they do not appear in the overall code trellis after interleaving. The proposed interleaver...
The field of wireless sensor networks offers a rich, multi-disciplinary area of research, in which a variety of tools and concepts can be employed to address a diverse set of applications. As such, many potentials of this field have been under study both in academia and in the industry. Smart environments represent the next evolutionary development step in building, utilities, industrial, home, shipboard,...
This review paper envisages use of multiple antenna elements in wireless communication over frequency non-selective radio channels. Various upcoming transmit strategies are discussed and compared to existing strategies such as beam forcing and space time block coding. It is revealed through this paper that the performance of transmission algorithm is largely dependent on channel characteristics such...
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