Wahab Ali Gulzar Khawaja

Works (12)

Updated: November 27th, 2023 08:06

2023 article

Propagation Measurements and Coverage Analysis for mmWave and Sub-THz Frequency Bands with Transparent Reflectors

Ganesh, A. P., Khawaja, W., Ozdemir, O., Güvenç, İ., Nomoto, H., & Ide, Y. (2023, June 1). 2023 IEEE 97TH VEHICULAR TECHNOLOGY CONFERENCE, VTC2023-SPRING.

By: A. Ganesh n, W. Khawaja n , O. Ozdemir n, İ. Güvenç n , H. Nomoto* & Y. Ide*

author keywords: 5G; 6G; channel sounding; curved reflectors; flat reflectors; mmWave; ray tracing; sub-THz; transparent reflectors
topics (OpenAlex): Advanced Wireless Communication Technologies; Millimeter-Wave Propagation and Modeling; Advanced MIMO Systems Optimization
TL;DR: Analysis of the use of passive transparent reflectors to improve signal coverage in an NLOS indoor scenario reveals that the transparent reflector outperforms the metal reflector and increases the radio propagation coverage in all three frequencies of interest: 28 GHz, 39 GHz, and 120 GHz. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: November 20, 2023

2022 article

Indoor Propagation Measurements with Transparent Reflectors at 28/39/120/144 GHz

Anjinappa, C. K., Ganesh, A. P., Ozdemir, O., Ridenour, K., Khawaja, W., Guvenc, I., … Ide, Y. (2022, May 16). 2022 IEEE International Conference on Communications Workshops (ICC Workshops).

By: C. Anjinappa n, A. Ganesh n, O. Ozdemir n, K. Ridenour n, W. Khawaja n , I. Guvenc n , H. Nomoto*, Y. Ide*

author keywords: 6G; B5G; Indoor coverage; mmWave; non-line-of-sight (NLOS); Sub-THz; Transparent reflectors
topics (OpenAlex): Millimeter-Wave Propagation and Modeling; Advanced Wireless Communication Technologies; Antenna Design and Analysis
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11. Sustainable Cities and Communities (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: September 26, 2022

2021 article

Channel Prediction for mmWave Ground-to-Air Propagation Under Blockage

Khawaja, W., Ozdemir, O., Guvenc, I., Khawaja, W., Ozdemir, O., & Guvenc, I. (2021, May 7). IEEE Antennas and Wireless Propagation Letters, Vol. 8, pp. 1364–1368.

By: W. Khawaja* , O. Ozdemir n, I. Guvenc n , W. Khawaja, O. Ozdemir & I. Guvenc

author keywords: Trajectory; Unmanned aerial vehicles; Predictive models; Azimuth; Receivers; Prediction algorithms; Forecasting; Blockage; channel prediction; millimeter wave (mmWave); unmanned aerial vehicle (UAV)
topics (OpenAlex): Millimeter-Wave Propagation and Modeling; UAV Applications and Optimization; Radio Wave Propagation Studies
TL;DR: A novel method of channel prediction during the GA link blockage at 28 GHz is provided, and results obtained from ray-tracing simulations indicate a close match between the actual and the predicted mmWave channel. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 16, 2021

2020 article

Correction of Channel Sounding Clock Drift and Antenna Rotation Effects for mmWave Angular Profile Measurements

Erden, F., Ozdemir, O., Khawaja, W., & Guvenc, I. (2020, January 1). IEEE Open Journal of Antennas and Propagation, Vol. 1, pp. 71–87.

By: F. Erden n , O. Ozdemir n, W. Khawaja n  & I. Guvenc n 

author keywords: 28 GHz; channel sounding; clock drift; Hungarian algorithm; millimeter-wave (mmWave); multipath component (MPC)
topics (OpenAlex): Millimeter-Wave Propagation and Modeling; Microwave Engineering and Waveguides; Microwave and Dielectric Measurement Techniques; Electromagnetic Compatibility and Measurements
TL;DR: This paper proposes an algorithm to correct the clock drift and MPC delay errors due to the rotation of the antennas and compares the MPCs from the SICL measurement and the corrected SECL measurements using a Hungarian algorithm based MPC matching method. (via Semantic Scholar)
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7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 24, 2019

2020 article

Coverage Enhancement for NLOS mmWave Links Using Passive Reflectors

Khawaja, W., Ozdemir, O., Yapici, Y., Erden, F., & Guvenc, I. (2020, January 1). IEEE Open Journal of the Communications Society, Vol. 1, pp. 263–281.

By: W. Khawaja* , O. Ozdemir n, Y. Yapici n, F. Erden n  & I. Guvenc 

author keywords: Coverage; indoor; mmWave; non-line-of-sight (NLOS); outdoor; PXI; ray tracing (RT); reflector
topics (OpenAlex): Millimeter-Wave Propagation and Modeling; Power Line Communications and Noise; Microwave Engineering and Waveguides
TL;DR: This work provides an analytical model for the end-to-end received power in an NLOS scenario using reflectors of different shapes and sizes and shows that the reflected received power for the NLOS link is the same as line-of-sight (LOS) free space received power of the same link distance. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 24, 2019

2020 article

Methodology for Benchmarking Radio-Frequency Channel Sounders Through a System Model

Gentile, C., Molisch, A. F., Chuang, J., Michelson, D. G., Bodi, A., Bhardwaj, A., … Dupleich, D. (2020, July 2). IEEE Transactions on Wireless Communications, Vol. 19, pp. 1–1.

By: C. Gentile*, A. Molisch *, J. Chuang *, D. Michelson *, A. Bodi*, A. Bhardwaj *, O. Ozdemir n, W. Khawaja n  ...

author keywords: Antenna measurements; Calibration; Wireless communication; Standards; Benchmark testing; Antenna arrays; Channel models; Antenna; measurement; propagation; cross-validation; millimeter-wave; mmWave
topics (OpenAlex): Millimeter-Wave Propagation and Modeling; Advanced MIMO Systems Optimization; Power Line Communications and Noise
TL;DR: This paper proposes an alternative methodology – which is both practical and reliable – based on a mathematical system model to represent the channel sounder that is applied to a ground-truth channel response that is identical for all systems. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 2, 2020

2020 article

Multiple ray received power modelling for mmWave indoor and outdoor scenarios

Khawaja, W., Ozdemir, O., Erden, F., Ozturk, E., & Guvenc, I. (2020, October 22). IET Microwaves Antennas & Propagation, Vol. 14, pp. 1825–1836.

By: W. Khawaja n , O. Ozdemir n, F. Erden n , E. Ozturk n & I. Guvenc n 

author keywords: indoor radio; array signal processing; ray tracing; millimetre wave propagation; directive antennas; 5G mobile communication; millimetre wave antennas; multipath channels; mmWave indoor scenarios; millimetre-wave frequency bands; fifth generation networks; mmWave frequencies; high gain antennas; beamforming mechanisms; mmWave end-to-end propagation; individual ray sources; radiation patterns; outdoor open area; dominant rays; radiation pattern; path loss; multipath components; indoor corridor scenarios; lower gain antennas; multiple ray received power modelling; mmWave outdoor scenarios
topics (OpenAlex): Millimeter-Wave Propagation and Modeling; Advanced MIMO Systems Optimization; Telecommunications and Broadcasting Technologies
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (OpenAlex)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: December 21, 2020

2020 article

Ultra-Wideband Air-to-Ground Propagation Channel Characterization in an Open Area

Khawaja, W., Ozdemir, O., Erden, F., Guvenc, I., & Matolak, D. W. (2020, June 17). IEEE Transactions on Aerospace and Electronic Systems, Vol. 56, pp. 4533–4555.

By: W. Khawaja n , O. Ozdemir n, F. Erden n , I. Guvenc n  & D. Matolak *

author keywords: Antenna measurements; Receiving antennas; Ultra wideband antennas; Antenna radiation patterns; Loss measurement; Area measurement; Air-to-ground  (AG); channel model; drone; multipath channel; path loss; propagation measurements; ultra-wideband  (UWB); unmanned-aerial-vehicle  (UAV)
topics (OpenAlex): UAV Applications and Optimization; Millimeter-Wave Propagation and Modeling; Radio Wave Propagation Studies
TL;DR: The Saleh–Valenzuela model was found to provide a good fit for the statistical channel model and an analytical path loss model based on antenna gains in the elevation plane is provided for unobstructed UAV hovering and moving (in a circular path) propagation scenarios. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries, ORCID
Added: January 4, 2021

2018 article

UWB channel measurements and modelling for hurricanes

Khawaja, W., Guvenc, I., & Chowdhury, A. (2018, April 12). IET Microwaves Antennas & Propagation, Vol. 12, pp. 1691–1699.

By: W. Khawaja n , I. Guvenc n  & A. Chowdhury *

author keywords: ultra wideband communication; wireless channels; radiotelemetry; storms; time-domain analysis; data analysis; statistical analysis; radiowave propagation; multipath channels; UWB channel measurement; public safety operation; channel propagation; hurricane condition; ultrawideband channel measurement; Florida International University; time-domain P410 radio; empirical data analysis; UWB statistical broadband channel model; large-scale UWB propagation parameter; small-scale UWB propagation parameter; line-of-sight link; LOS link; nonline-of-sight link; NLOS link; wind driven rain; WDR; link obstruction
topics (OpenAlex): Ultra-Wideband Communications Technology; Precipitation Measurement and Analysis; Millimeter-Wave Propagation and Modeling
TL;DR: The authors characterise the effects of rain and wind speed on large-scale and small-scale UWB propagation parameters considering both line-of-sight (LOS) and non-LOS (NLOS) links and developed an UWB statistical broadband channel model for hurricanes. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries
Added: October 19, 2018

2017 article

UAV Air-to-Ground Channel Characterization for mmWave Systems

Khawaja, W., Ozdemir, O., & Guvenc, I. (2017, September 1). 2017 Ieee 86th Vehicular Technology Conference (Vtc-Fall).

By: W. Khawaja n , O. Ozdemir n & I. Guvenc n 

topics (OpenAlex): Millimeter-Wave Propagation and Modeling; UAV Applications and Optimization; Advanced MIMO Systems Optimization
TL;DR: The characterization of mmWave air-to-ground (AG) channels for unmanned aerial vehicle (UAV) communications is studied and details of a universal serial radio peripheral (USRP) based channel sounder that can be used for AG channel measurements for mmWave (60 GHz) UAV communications are presented. (via Semantic Scholar)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2017 conference paper

UWB radar based beyond wall sensing and tracking for ambient assisted living

2017 14th ieee annual consumer communications & networking conference (ccnc), 142–147.

By: W. Khawaja , F. Koohifar & I. Guvenc 

Source: NC State University Libraries
Added: August 6, 2018

2017 article

Ultra-Wideband Channel Modeling for Hurricanes

Khawaja, W., Guvenc, I., & Chowdhury, A. (2017, September 1). 2017 Ieee 86th Vehicular Technology Conference (Vtc-Fall).

By: W. Khawaja n , I. Guvenc n  & A. Chowdhury *

topics (OpenAlex): Precipitation Measurement and Analysis; Radio Wave Propagation Studies; Indoor and Outdoor Localization Technologies; Millimeter-Wave Propagation and Modeling
TL;DR: From the empirical data analysis in time domain, a UWB statistical broadband channel model for hurricanes is developed and the effects of rain and wind speed on large scale and small scale UWB propagation parameters are characterized. (via Semantic Scholar)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

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