This paper extends a recently proposed space-time model for Rayleigh fading to include an arbitrary transmit antenna configuration of any shape and size transmitting simultaneously in a multiple-input multiple-output (MIMO) channel. The space-time correlation function and space-frequency cross spectrum function for a non-isotropic scatterer distribution around the receiver is derived for the ar...

Multiple-input–multiple-output (MIMO) systems offer much capacity gain over single antenna approaches. The recently proposed multistratum space–time code (MSSTC) is such a MIMO-scheme among many others. In this paper, a generalization of the multistratum idea is presented and leads to the new family of multistratum-permutation codes. It is shown, that this scheme can achieve a higher link capac...

The problems to be solved by modern radio electronic systems become more and more complicated and diversified. This process is accompanied by the growing of different demands for such systems’ characteristics and, respectively, active searching of considerable improvement of these characteristics. There the importance of the accidental factors (errors) of amplitude-phase distribution (APD) of a...

Emerging telecommunication technologies like 5G, green communications, and massive MIMO contribute to the use of directional antennas and beamforming. For this reason, modern propagation models should consider directional antennas with different beam widths, gains and radiation pattern directions. Most of the available propagation models are based on omnidirectional or isotropic antennas. A pro...

Microwave imaging techniques are prone to signal corruption from unwanted multipath signals. Near-field systems are especially vulnerable because signals can scatter and reflect from structural objects within or on the boundary of the imaging zone. These issues are further exacerbated when surface waves are generated with the potential of propagating along the transmitting and receiving antenna...

This paper presents the design of an energy harvesting wireless and battery-less silicon-on-chip (SoC) device that can be implanted in the human body to monitor certain health conditions. The proposed architecture has been designed on TSMC 0.18μm CMOS ICs and is an integrated system with a rectenna (antenna and rectifier) and transmitting circuit, all on a single chip powered by an external tra...

In this paper, we derive upper and lower bounds as well as a simple closed-form approximation for the capacity of the continuous-time, bandlimited, additive white Gaussian noise channel in a three-dimensional free-space electromagnetic propagation environment subject to constraints on the total effective antenna aperture area of the link and a total transmitter power constraint. We assume that ...

Wireless communication systems that use multiple transmitting and receiving antennas have received a significant amount of attention. In these spatial multiplexing systems, by transmitting multiple co-channel signals simultaneously, the system capacity can be considerably increased especially in rich-scattering wireless channels. Over the last decade, many investigations into multiple-antenna s...