Multiple antennas at the transmitter and receiver can achieve enormous capacities by transmitting on the channel’s eigenmodes when the channel realization is known at the transmitter. If the transmitter has no knowledge of the channel, a significant fraction of the eigenmode capacity can be achieved in an open-loop mode, but multidimensional coding is required. In this paper, we show how the op...

Multiple-input multiple-output (MIMO) have been employed in present wireless systems to achieve high data rates within the limited radio frequency (RF) spectrum. MIMO systems make use of multiple transmitting antennas and multiple receiving antennas. The performance analysis of MIMO system over Rayleigh fading channel with ZF receiver is presented. It can be improved by making use of spatial di...

Abstract The work deals with the design, modelling and research of an antenna system for transmitting receiving information in satellite systems. It was revealed that this array a transmitter 85 dBWt is guaranteed to solve target problem providing mobile communications both one global beam plurality beams width 0,7 × 0,7°. should be added advantage forming multiple compared single phased is: hi...

This paper studies the use of directional antennas for received signal strength difference (RSSD) based localization using ultra-wideband and demonstrates the achievable accuracy with this localization method applied to UWB. As introduced in our previous work the RSSD localization is assisted with one Time Difference of Arrival (TDOA) estimation. The use of directional receiving antennas and an...

As radio signals are propagated through the atmosphere, they are affected mostly by variability in refractive index which, in turn, leads to a decrease in their speed of propagation. This will eventually bring about a delay called propagation delay . Propagation delay could be viewed in various forms, but this paper has concentrated on ionospheric and tropospheric propagation delays. These dela...

This paper describes a method for airborne evaluation and verification of the antenna patterns of broadcasting stations. Although it is intended for governmental institutions and broadcasters it may be also of interest to anyone who wants to evaluate large radiating structures. An airborne measurement to investigate the properties of the structure in all dimensions is needed. For complicated la...

This paper presents an effort to construct a multiuser (MU) multiple-input multipleoutput (MIMO) broadcast channel (BC) model. Our method is able to adequately build in the correlation and mutual coupling, which are important factors affecting the multi-antenna arrays. This helps to decrease the need for complex mathematical analysis and allows an easy simulation of the MU MIMO BC performance. ...

The space solar power station (SSPS) capable of providing earth with primary power has been researched for 50 years. The SSPS is a tremendous design involving optics, mechanics, electromagnetism, thermology, control, and other disciplines. This paper presents a novel design project for SSPS named OMEGA. The space segment of the proposed GEO-based SSPS is composed of four main parts, such as sph...