Synchronization of Multiple Independent Subarray Antennas: An Application for Angle of Arrival Estimation

• Published in: IEEE transactions on antennas and propagation Vol. 67; no. 2; pp. 1223 - 1232
• Main Authors: BniLam, Noori, Steckel, Jan, Weyn, Maarten
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive array antenna systems; Algorithms; Angle of arrival; angle of arrival (AoA) estimation; Antenna arrays; Antennas; Apertures; Array signal processing; Computer simulation; Estimation; Frequency synchronization; Internet of Things (IoT) localization; least mean square (LMS) algorithm; maximum likelihood (ML) algorithm; pattern beamforming; Receiving antennas; Synchronization; Time synchronization
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2018.2880014

In this paper, we present a new algorithm to synchronize multiple individual receiving subarray antennas to form an augmented array antenna system. This augmented array antenna has a large antenna aperture that can be used for angle of arrival (AoA) estimations and it provides a better AoA estimation accuracy than the individual subarray antennas. The proposed algorithm synchronizes the time and the frequency of the different subarray antennas, using a joint maximum likelihood (ML) optimization for a data-aided received signal. The phase coherency between the subarray antennas is achieved by using a combination of the least mean square and ML algorithms. The experimental results and the simulation example show that the proposed algorithm: 1) is stable in estimating the augmented array antenna pattern; 2) provides more accurate AoA estimations than the individual subarray antennas; 3) has no limitation to the structure of the augmented array antenna in space; and 4) converges very fast. Furthermore, the experimental results prove the feasibility of using AoA estimation techniques for Internet of Things localization in outdoor environments.