Table of Contents Author Guidelines Submit a Manuscript
International Journal of Antennas and Propagation
Volume 2015, Article ID 278160, 9 pages
http://dx.doi.org/10.1155/2015/278160
Research Article

Linear Array Design with Switched Beams for Wireless Communications Systems

1Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
2Universidade Federal do Pampa, 97546-550 Alegrete, RS, Brazil
3Blekinge Institute of Technology, 371 79 Karlskrona, Sweden

Received 19 September 2014; Revised 30 March 2015; Accepted 3 April 2015

Academic Editor: Wenhua Chen

Copyright © 2015 Vinícius Ludwig-Barbosa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents an analysis for optimal design of switched beamforming applied to a linear array for wireless communication systems. The beam switching scheme provides coverage of a given sector in azimuth and controls the sidelobe level simultaneously. The analysis was developed considering arrays composed of Quasi-Yagi elements. The model assumes a user moving in the azimuthal direction under a constant velocity and with an estimation of the signal-to-noise ratio (SNR) at the mobile user (MU). The radio base station applies the beam that yields the best performance during transmission. The decision is based on the feedback information received from the MU. The goal of the analysis is to determine the best trade-off between the array size and number of feedback bits necessary to maximize the SNR at the receiver. The results show that a compromise between the number of beam-pointing directions and the array size should be taken into consideration for a wireless communication system design.