TY  - BOOK
AU  - Mohamed Waeel Hamdy,
AU  - Ahmed Hesham Mehana 
AU  - Mohammed Ahmed 
TI  - Enhanced single-shot beam-training using true-time-delay units for mmwave hybrid arrays
U1  - 621.382 
PY  - 2023///
KW  - Communications Engineering
KW  - qrmak
KW  - mmWave
KW  - True-Time-Delay
KW  - Beam-learning
KW  - Hybrid analog
KW  - digital arrays
KW  - single-shot
N1  - Thesis (M.Sc)-Cairo University, 2023; Bibliography: pages 65-67; Issues also as CD
N2  - Massive arrays are used in millimeter wave channels to compensate for the severe propa- gation path loss. One of the common challenges, that is a by-product of massive arrays, is the beam steering and selection. In this work, we use true-time-delay to minimize the beam training overhead associated with large number of antennas in millimeter wave.
We propose an angle-of-arrival estimation algorithm that leverages the degrees of freedom introduced by hybrid beamforming system and thus, allows for single-shot, i.e., single-pilot, estimation process with good performance. The proposed algorithm improves the 5th percentile beamforming gain compared to the existing single-shot algorithms. Our simulations show that the proposed algorithm enhances the receiver’s sensitivity by 3 dB when using hybrid arrays. We show that at relatively fair signal-to-noise ratios, the num- ber of analog-to-digital converters at the receiver side can be decreased without significant performance loss, thus saving power and area
ER  -