Linear Array Design with Switched Beams for Wireless Communications Systems

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.

Multi‐beam steered harmonic pattern synthesis in timed antenna array with optimized and pre‐defined RF switching

“…Optimal directivity and gain can be achieved by optimizing parameters such as inter‐element spacing, excitation amplitude, and excitation phase. The design of proper antenna array techniques leads to significant improvement in the reliability and throughput of the wireless communication systems 11 . Antenna beams are used for different applications in communication systems.…”

Beamforming of a Linear Array Applying PSO Algorithm with Restrictive Approach

“…The analysis presented in [21] proves that an amount of beams equivalent to the number of elements (n elements and n beam-pointing directions) in a given antenna array is a good trade-off in terms of overall system costs and SNR performance. An amount of beams bigger than the number of elements causes small improvements in the system performance, tending to average SNR level saturation.…”

Beamforming of an E-shaped Linear Array for WLAN Systems Applying PSO Algorithm with Restrictive Approach

“…Considering such array covering a 60 • sector of a cellular cell, four distinguished beams are required to yield efficiently coverage of such sectored area. The choice of the number of beams take into account the balance between stable performance during transmission and system requirementsas available bits for feedback information to set the chosen beamforming during the communication [19]. Consequently, four sets of excitation amplitudes should be provided by the optimization algorithm to radiate the required patterns.…”