Performance comparison and improvement in adaptive arrays based on time‐ and frequency‐domain signal processing

Abstract

AbstractIt has been known that an adaptive array antenna is effective for reducing frequency‐depending selective fading, which is a problem in wide‐band land‐mobile communication systems. In an environment in which many delayed signals arrive, it is desirable to improve their SN ratio by using co‐phase synthesis. There have been two types of adaptive array antenna for this purpose: an antenna based on time‐domain signal processing using a TDL (tapped delay line), and an antenna based on frequency‐domain signal processing using a fully reconfigurable filter. The latter has variations in its configuration, and is useful for making practical apparatus. However, its convergence process and behavior in a fading environment have not been clearly understood. In this paper, the performance and the advantages and disadvantages of adaptive array antennas based on various configurations with time‐ and frequency‐domain signal processing are compared. It is found that combinations of some configurations improve their performance. The improvement in performance is also described. © 2002 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 85(9): 35–42, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.1117 Copyright © 2002 Scripta Technica