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A 10ns Delay Range 1.5GHz BW True-Time-Delay Array-Based Passive-Active Signal Combiner with Negative-Cap Stabilized RAMP for Fast Precise Localization

https://doi.org/10.1109/RFIC61187.2024.10600032

Xu, Qiuyan ; Lin, Chung-Ching ; Wadaskar, Aditya ; Hu, Huan ; Cabric, Danijela ; Gupta, Subhanshu ( June 2024 , IEEE)

Free, publicly-accessible full text available June 16, 2025
Custom Over-the-air Scalable mmWave Testbed for Fast TTD-Based Rainbow Beam Training

https://doi.org/10.1109/ICC51166.2024.10622779

Mokri, Mohammad Ali ; Wang, Yen-Chin ; Li, Ruifu ; Wadaskar, Aditya ; Gupta, Subhanshu ; Heo, Deukhyoun ; Cabric, Danijela ( June 2024 , IEEE)

Millimeter-wave (mmWave) systems require a large number of antennas, which makes the beam training challenging and time-consuming for conventional phased arrays. Recently, a true-time-delay (TTD) array-based beam training algorithm has been shown as an effective solution to overcome the training overhead in large arrays. In this paper, we present a custombuilt over-the-air (OTA) testbed to study the effects of hardware impairments on the TTD-based beam training and verify its feasibility in a real system. We proposed an orthogonal matching pursuit (OMP) based reconstruction algorithm along with a phase calibration dictionary to combat nonidealities such as strong frequency selectivity and phase misalignment in the received raw IQ signal. Post-processing results showed that with the nonideality effects properly handled, the 3D TTD beam training algorithm can achieve high AOA estimation accuracy.
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Free, publicly-accessible full text available June 9, 2025
A Switching-less True-time-delay based Beam Probing Approach for Ultra-Low Latency Wireless Communications: System Analysis and Demonstration

https://doi.org/10.1109/TCSII.2022.3178716

Xu, Qiuyan ; Wadaskar, Aditya ; Lin, Chung-Ching ; Yan, Han ; Boljanovic, Veljko ; Gupta, Subhanshu ; Cabric, Danijela ( May 2022 , IEEE Transactions on Circuits and Systems II: Express Briefs)

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3D Rainbow Beam Design for Fast Beam Training with True-Time-Delay Arrays in Wideband Millimeter-Wave Systems

https://doi.org/10.1109/IEEECONF53345.2021.9723402

Wadaskar, Aditya ; Boljanovic, Veljko ; Yan, Han ; Cabric, Danijela ( October 2021 , 2021 55th Asilomar Conference on Signals, Systems, and Computers)

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