In this paper recent developments of RF front-end system based on the active integrated antenna design concepts are presented. Thanks to the enhancements in the design of special antennas working as radiator as well as providing the other circuit functionalities, the antenna-integrated RF front ends have been capable of improving the circuit-efficiency and compactness. These enhancements are il...

The optimal antenna location for maximizing the channel capacity is searched by particle swarm optimizer (PSO). There are two different receiver locations considered in the simulation. The receivers are located with uniform intervals distribution (i) on the tables; (ii) in the whole indoor environment. Numerical results have shown that our proposed method is effect to find the optimal location ...

A random matrix model is introduced that probabilistically describes the multi–path propagation between a transmitting and receiving antenna array with a limited number of scatterers for indoor environments. The model allows to analytically calculate signal–to–interference– and–noise ratios and channel capacities for communication systems that apply, similar to the BLAST [1] proposal, antenna a...

We investigate the use of multiple transmitting and or receiving antennas for single user communications over the additive Gaussian channel with and without fading We derive formulas for the capacities and error exponents of such channels and describe computational procedures to evaluate such for mulas We show that the potential gains of such multi antenna systems over single antenna systems is...

dN The field scattered by an antenna contains a component that is the short circuit scattered field normalized by the short circuit current, and a second component that ls the radiation field normalized by the transmitting current and multiplied by a factor (1 r). RCS is the magnitude squared of the difference between two terms, one being the square root of a complex "structural" cross section,...

. The ~easurement of the differential propagation phase and copolar correlation coefficient are affected by the d1fferent1al phase pattern of the antenna system when operating in an alternate horizontal and vertical transmitting scheme. Direct phase pattern measurements of a large dish such as that of the CSU CHILL is difficult because of the need to obtain phase reference. A simple technique i...

The capacity of a flat-fading wireless channel increases with the number of antennas used at both ends of the wireless link. However, the complexity of Multiple Input Multiple Output (MIMO) transmission algorithms increases coincidently. Transmitting and receiving over a subset of the available antennas is referred to as antenna selection. A signal strength based selection criterion is introduc...

In the HF band (3-30 MHz), the equipment used for transmission or for location finding, rely on the antenna system which can be very varied, using antenna diversity and/or space diversity. The roles of these antennas or antenna arrays are presented in this paper using a bi-vectorial model related to ionospheric links. This narrow band model includes propagation effects, transmitting and receivi...