+48 22 5128 100  
info@il-pib.pl

Szachowa 1,
04-894 Warszawa

|
Paweł Woźniak

Electromagnetic Scattering of Inhomogeneous Plane Wave by Ensemble of Cylinders

Authors: Lorenzo Dinia , Fabio Mangini  , and Fabrizio Frezza

  Download article [1,4 MB]

Abstract:

The interaction between an ensemble of cylinders and an inhomogeneous plane wave is introduced and is determined, in the present paper, through a rigorous theoretical approach. Scattered electromagnetic field generated by an indefinite number of infinite circular cylinders is analyzed by the application of the generalized vector cylinder harmonics (VCH) expansion. The exact mathematical model relied upon to represent this scenario considers the so-called complex-angle formalism reaching a superposition of vectorial cylindrical-harmonics and Foldy-Lax Multiple scattering equations (FLMSE) to account for the multiscattering process between the cylinders. The method was validated by comparing the numerical results obtained with the use of the finite element method and a homemade Matlab code.

Keywords:

electromagnetic scattering, inhomogeneous wave dispersion, lossy media, multi-cylinders scattering, vectorial cylindrical-harmonics.

Published in: Journal of Telecommunications and Information Technology (Early Access)

Page(s): 1-7

DOI: https://doi.org/10.26636/jtit.2020.138519

Date of Publication: 14 July 2020

 

Performance Improvement for Vehicular Communications Using Alamouti Scheme with High Mobility

Authors: My Abdelkader Yousse fi and Ahmed Mouhsen

  Download article [2 MB]

Abstract:

TThe IEEE 802.11p standard is the basic protocol for wireless access in a vehicular environment (WAVE), providing high throughput for multimedia and high quality for vehicular transmissions. However, IEEE 802.11p fails to offer any multi-antenna approaches. In this paper, a multiple-input single-output (MISO) implementation with orthogonal frequency division multiplexing (OFDM), aiming to improve the performance of IEEE 802.11p, is proposed. The authors investigate the impact of time-varying channel on the performance of Alamouti space-time block codes (STBC) in OFDM systems. The Alamouti STBC approach shows good performance in slow time-varying environments, while its Alamouti space frequency block codes (SFBC) counterpart performs better over fast time-varying environments. An adaptive switching scheme is proposed to select appropriate space-block coding (STBC or SFBC) in vehicular channels with high mobility levels. It is shown that the proposed adaptive scheme provides better performance compared with traditional space-block codes.

Keywords:

IEEE 802.11p, MIMO, MISO, OFDM, SFBC, STBC, vehicular channel.

Published in: Journal of Telecommunications and Information Technology (Early Access)

Page(s): 1-10

Date of Publication: 17 July 2020