Yunchou Xing's research while affiliated with New York University and other places

Publications (34)

Preprint
Full-text available
Small-cell cellular base stations are going to be used for mmWave and sub-THz communication systems to provide multi-Gbps data rates and reliable coverage to mobile users. This paper analyzes the base station coverage of sub-THz communication systems and the system performance in terms of spectral efficiency through Monte Carlo simulations for both...
Preprint
Full-text available
Sub-Terahertz (THz) frequencies between 100 GHz and 300 GHz are being considered as a key enabler for the sixth-generation (6G) wireless communications due to the vast amounts of unused spectrum. The 3rd Generation Partnership Project (3GPP) included the indoor industrial environments as a scenario of interest since Release 15. This paper presents...
Article
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Comparisons of outdoor Urban Microcell (UMi) large-scale path loss models, root mean square (RMS) delay spreads (DS), angular spreads (AS), and the number of spatial beams for extensive measurements performed at 28, 38, 73, and 142 GHz are presented in this letter. Measurement campaigns were conducted from 2011-2020 in downtown Austin, Texas, Manha...
Preprint
Full-text available
Comparisons of outdoor Urban Microcell (UMi) large-scale path loss models, root mean square (RMS) delay spreads (DS), angular spreads (AS), and the number of spatial beams for extensive measurements performed at 28, 38, 73, and 142 GHz are presented in this letter. Measurement campaigns were conducted from 2011-2020 in downtown Austin, Texas, Manha...
Article
Full-text available
This letter provides a comparison of indoor radio propagation measurements and corresponding channel statistics at 28, 73, and 140 GHz, based on extensive measurements from 2014-2020 in an indoor office environment. Side-by-side comparisons of propagation characteristics (e.g., large-scale path loss and multipath time dispersion) across a wide rang...
Article
Full-text available
This paper demonstrates how spectrum up to 1 THz will support mobile communications beyond 5G in the coming decades. Results of rooftop surrogate satellite/tower base station measurements at 140 GHz show the natural isolation between terrestrial networks and surrogate satellite systems, as well as between terrestrial mobile users and co-channel fix...
Article
Full-text available
Millimeter-wave (mmWave) and sub-Terahertz (THz) frequencies are expected to play a vital role in 6G wireless systems and beyond due to the vast available bandwidth of many tens of GHz. This paper presents an indoor 3-D spatial statistical channel model for mmWave and sub-THz frequencies based on extensive radio propagation measurements at 28 and 1...
Preprint
Full-text available
Millimeter-wave (mmWave) and sub-Terahertz (THz) frequencies are expected to play a vital role in 6G wireless systems and beyond due to the vast available bandwidth of many tens of GHz. This paper presents an indoor 3-D spatial statistical channel model for mmWave and sub-THz frequencies based on extensive radio propagation measurements at 28 and 1...
Preprint
Full-text available
High Altitude Platform Station (HAPS) has the potential to provide global wireless connectivity and data services such as high-speed wireless backhaul, industrial Internet of things (IoT), and public safety for large areas not served by terrestrial networks. A unified HAPS design is desired to support various use cases and a wide range of requireme...
Preprint
Full-text available
Terahertz frequency bands will likely be used for the next-generation wireless communication systems to provide data rates of hundreds of Gbps or even Tbps because of the wide swaths of unused and unexplored spectrum. This paper presents two outdoor wideband measurement campaigns in downtown Brooklyn (urban microcells) in the sub-THz band of 140 GH...
Preprint
Full-text available
This paper demonstrates how spectrum up to 1 THz will support mobile communications beyond 5G in the coming decades. Results of rooftop surrogate satellite/tower base station measurements at 140 GHz show the natural isolation between terrestrial networks and surrogate satellite systems, as well as between terrestrial mobile users and co-channel fix...
Preprint
Full-text available
This letter provides a comparison of indoor radio propagation measurements and corresponding channel statistics at 28, 73, and 140 GHz, based on extensive measurements from 2014-2020 in an indoor office environment. The empirical investigations used a wideband sliding correlation-based channel sounder with steerable horn antennas at both the transm...
Preprint
Millimeter-wave (mmWave) and Terahertz (THz) will be used in the sixth-generation (6G) wireless systems, especially for indoor scenarios. This paper presents an indoor three-dimensional (3-D) statistical channel model for mmWave and sub-THz frequencies, which is developed from extensive channel propagation measurements conducted in an office buildi...
Preprint
Accurate precise positioning at millimeter wave frequencies is possible due to the large available bandwidth that permits precise on-the-fly time of flight measurements using conventional air interface standards. In addition, narrow antenna beamwidths may be used to determine the angles of arrival and departure of the multipath components between t...
Preprint
Accurate channel modeling and simulation are indispensable for millimeter-wave wideband communication systems that employ electrically-steerable and narrow beam antenna arrays. Three important channel modeling components, spatial consistency, human blockage, and outdoor-to-indoor penetration loss, were proposed in the 3rd Generation Partnership Pro...
Preprint
This paper provides indoor reflection, scattering, transmission, and large-scale path loss measurements and models, which describe the main propagation mechanisms at millimeter wave and Terahertz frequencies. Channel properties for common building materials (drywall and clear glass) are carefully studied at 28, 73, and 140 GHz using a wideband slid...
Preprint
This paper provides an analysis of radio wave scattering for frequencies ranging from the microwave to the Terahertz band (e.g. 1 GHz - 1 THz), by studying the scattering power reradiated from various types of materials with different surface roughnesses. First, fundamentals of scattering and reflection are developed and explained for use in wirele...
Article
Full-text available
Frequencies from 100 GHz to 3 THz are promising bands for the next generation of wireless communication systems because of the wide swaths of unused and unexplored spectrum. These frequencies also offer the potential for revolutionary applications that will be made possible by new thinking, and advances in devices, circuits, software, signal proces...
Preprint
With the relatively recent realization that millimeter wave frequencies are viable for mobile communications, extensive measurements and research have been conducted on frequencies from 0.5 to 100 GHz, and several global wireless standard bodies have proposed channel models for frequencies below 100 GHz. Presently, little is known about the radio c...
Preprint
This article presents measurement guidelines and verification procedures for antenna cross-polarization discrimination (XPD) and penetration loss measurements for millimeter wave (mmWave) channel sounder systems. These techniques are needed to ensure accurate and consistent measurements by different researchers at different frequencies and bandwidt...
Article
This paper provides an overview of the features of fifth generation (5G) wireless communication systems now being developed for use in the millimeter wave (mmWave) frequency bands. Early results and key concepts of 5G networks are presented, and the channel modeling efforts of many international groups for both licensed and unlicensed applications...
Article
This paper shows the remarkable distances that can be achieved using millimeter wave communications, and presents a new rural macrocell (RMa) path loss model for millimeter wave frequencies, based on measurements at 73 GHz in rural Virginia. Path loss models are needed to estimate signal coverage and interference for wireless network design, yet li...

Citations

... N EXT-generation networks continuously adopt newer bands in the higher end of the spectrum, like millimeterwave (mmWave) bands, and even tap into the sub-terahertz bands for 6G [1]- [3]. The adoption of higher spectrum bands helps mitigate the spectrum crunch, but it comes with the challenge of overcoming the associated severe path loss [4], [5]. ...
... The most important characteristic of wave propagation is pathloss, with upper mmWave RFs showing pathloss exponents of omni-directional channels around 2 and 3 in outdoor cellular line-of-sight (LoS) and non-line-of-sight (NLoS) environments [16]. Even though diffraction coefficients are smaller as the RF increases, reflections on concrete walls, metal lampposts and tinted glasses can deliver power from one link end to another, making the link connectivity in NLoS feasible through one or multiple reflections even for upper mmWave. ...
... In this paper, we propose to introduce high altitude platforms (HAPs) as PSs to orchestrate LEO satellites in the learning process, and propose a novel synchronous FL algorithm, FedHAP, to accomplish learning in a highly efficient way by exploiting satellite-HAP as well as inter-satellite/HAP communications. A HAP is a semi-stationary aerial station that operates in the stratosphere which is 18-24 km above the ground [8,9]. Using HAPs to act as PSs leads to several advantages over using GSs or medium/high Earth orbit (MEO/HEO) satellites as PSs, including: 1) a much improved visibility between satellites and PS due to the much elevated altitude (a GS can only "see" a range of 180 o − α where α is the elevation angle), whereas a HAP can "see" even beyond 180 o ); in other words, a HAP will see each satellite more often and can also connect to more satellites at a time; 2) the communication environment above stratosphere is much clearer and stabler than the troposphere and with less interference, which leads to higher data rate and lower transmission and propagation delay [8,9] between satellites and HAPs; 3) the total cost of a HAP (manufacturing, deployment, and maintenance) is much lower than that of a GS which can reach millions of dollars; 4) HAPs can be easily relocated to adapt to the changes of LEO constellations or to the proximity of ground locations that need FL services; on the contrary, a GS nearly not possible to relocate. ...
... Different types of technologies can be band together and integrated and an autonomous and intelligent vehicle will be on the road without compromising the safety aspect of the passenger. By installing more antennas will enable in time of sight conditions, 6G vision can be achieved [10][11][12]. ...
... Meanwhile, it is clear that spatial profiles at mmWave bands tend to be more specular and sparse. In addition, path loss and delay dispersion parameters at 28, 73, and 140 GHz in an indoor scenario have been presented, where good similarity in path loss yet reduced time dispersion were observed in higher frequency bands [15]. In [16], channel sounding results reported in mmMAGIC project (covering different propagation scenarios and different frequency bands in 2 to 86 GHz [17]) were summarized with a focus on root mean square (rms) delay spread (DS), showing that any frequency trend of the DS is small considering its confidence intervals and largely dependent on the specific scenario. ...
... Then, 5 × 10 7 random independent values of RVs Θ xi and Θ yi are generated related to the UAVs' vibrations. After that, using (11) and (12), 5 × 10 7 independent values of intra-cell interference and using (13) and (16), 5 × 10 7 independent values of inter-cell interference are produced. Finally, by averaging over 5 × 10 7 independent runs, the average values of inter-cell and intra-cell interference are obtained. ...
... To support more devices and ultra-high capacity applications, 6th Generation (6G) wireless networks will require data rates that are orders of magnitude higher than available today, thus boosting the need for spectrum 7 . While the 5th Generation (5G) of mobile networks uses carrier frequencies as high as 71 GHz 8 , 6G will move beyond 100 GHz [9][10][11] to aggregate data of many mobile users in ultra-high capacity backhaul links. ...
... In addition, mmWave multipath signal information may further improve the localization accuracy even in NLoS scenarios. Kanhere et al 19 proposed a 3D multipath tracer for the indoor environment using a fusion of temporal, angular, and 3D maps of the environment. The authors claimed this system can provide localization accuracy of 12.6 cm in LoS and 16.3 cm in NLoS scenarios over a distance up to 25 m range measurement with just a single anchor. ...
... We consider an mmW communication system with small-scale fading scenario [25] in this paper. Both the transmitting and receiving antenna arrays are uniform planar antenna arrays, and the number of transmitting and receiving antennas is equal. ...