Mohamed Waeel Hamdy, <br/><br/>
Enhanced single-shot beam-training using true-time-delay units for mmwave hybrid arrays / 
 طريقة محسنة لتدريب الحزمة من مرة واحدة باستخدام أجهزة تأخير الوقت الحقيقية للمصفوفات الهوائية الهجينة لنظم الموجات الميلليمترية / 
by Mohamed Waeel Hamdy ; Supervisors Prof. Ahmed Hesham Mehana, Dr. Mohammed Ahmed Abdelghany. 
 - 67 pages :   illustrations ;  30 cm. +   CD. 
<br/><br/>Thesis (M.Sc)-Cairo University, 2023. 
<br/><br/>Bibliography: pages 65-67. 
<br/><br/> 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.<br/>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 
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<br/><br/><br/>Text in English and abstract in Arabic & English. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communications Engineering
<br/><br/><label>Subjects--Index Terms: </label>mmWave  True-Time-Delay  Beam-learning  Hybrid analog  digital arrays  single-shot 
<br/><br/><label>Dewey Class. No.: </label>621.382