Abstract
Envisioned analog beamforming, high-gain, phased antenna array systems operating at millimeter-wave (mmWave) frequencies require a fast beam selection process for practical implementation in mobile units in a changing propagation environment. This paper proposes a novel direction of arrival (DoA) estimation technique using a single RF chain reconfigurable Alford loop antenna at sub-6GHz frequencies to facilitate a rapid optimal beam selection process at mmWave frequencies. Measurement-based DoA estimation, demonstration of reduced beam scanning overhead at mmWave frequencies, and design of a software-defined-radio (SDR)-based testbed for evaluating the proposed integrated system are addressed.
Highlights
Millimeter wave unlicensed spectrum is a key enabler for future high data rate wireless communication systems
This paper proposes a new low complexity coarse direction of arrival (DoA) estimation at sub-6GHz to aid in the beam scanning process of the mmWave antenna system [9]
The proposed solution operates in the New Radio (NR) band (1GHz–52.6GHz) [11] where the high data rate mmWave communication module operates at 28GHz and the low data rate communication and DoA estimation occurs at a sub-6GHz frequency (3.5GHz)
Summary
Millimeter wave (mmWave) unlicensed spectrum is a key enabler for future high data rate wireless communication systems. This paper proposes a new low complexity coarse DoA estimation at sub-6GHz to aid in the beam scanning process of the mmWave antenna system [9]. The proposed solution operates in the New Radio (NR) band (1GHz–52.6GHz) [11] where the high data rate mmWave communication module operates at 28GHz and the low data rate communication and DoA estimation occurs at a sub-6GHz frequency (3.5GHz).
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