000			02895namaa22004091i 4500
003			OSt
005			20250409120900.0
008			250317s2023 |||a|||f m||| 000 0 eng d
040			_aEG-GICUC _beng _cEG-GICUC _dEG-GICUC _erda
041	0		_aeng _beng _bara
049			_aDeposit
082	0	4	_a621.382
092			_a621.382 _221
097			_aM.Sc
099			_aCai01.13.08.M.Sc.2024.Mo.E
100	0		_aMohamed Waeel Hamdy, _epreparation.
245	1	0	_aEnhanced single-shot beam-training using true-time-delay units for mmwave hybrid arrays / _cby Mohamed Waeel Hamdy ; Supervisors Prof. Ahmed Hesham Mehana, Dr. Mohammed Ahmed Abdelghany.
246	1	5	_aطريقة محسنة لتدريب الحزمة من مرة واحدة باستخدام أجهزة تأخير الوقت الحقيقية للمصفوفات الهوائية الهجينة لنظم الموجات الميلليمترية /
264		0	_c2023.
300			_a67 pages : _billustrations ; _c30 cm. + _eCD.
336			_atext _2rda content
337			_aUnmediated _2rdamedia
338			_avolume _2rdacarrier
502			_aThesis (M.Sc)-Cairo University, 2023.
504			_aBibliography: pages 65-67.
520			_aMassive 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
530			_aIssues also as CD.
546			_aText in English and abstract in Arabic & English.
650		7	_aCommunications Engineering _2qrmak
653		0	_ammWave _aTrue-Time-Delay _aBeam-learning _aHybrid analog _adigital arrays _asingle-shot
700	0		_aAhmed Hesham Mehana _ethesis advisor.
700	0		_aMohammed Ahmed _ethesis advisor.
900			_b01-01-2023 _cAhmed Hesham Mehana _cMohammed Ahmed _dHebat-Allah Moustafa Mourad _dElsayed Mostafa Saad Mostafa _UCairo University _FFaculty of Engineering _DDepartment of Electronics and Communications Engineering
905			_aShimaa _eHuda
942			_2ddc _cTH _e21 _n0
999			_c171180