Jack Chuang's research while affiliated with National Institute of Standards and Technology and other places
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Publications (18)
If a wireless channel is said wide-sense stationary (WSS), the mean and autocorrelation of its small-scale fading are position invariant. This occurs when the channel is rich in propagation paths -their complex summation averages out any position-specific characteristics. Extensive measurement campaigns have validated the microwave channel to be WS...
Sensing with communication waveforms has drawn growing interest thanks to the ubiquitous availability of wireless networks. However, the required sensing resources may not always be available in a communication system. In addition, the communication system may have limited bandwidth, beamwidth, and transmit power, which could limit the sensing accu...
Efficient design of integrated sensing and communication systems can minimize signaling overhead by reducing the size and/or rate of feedback in reporting channel state information (CSI). To minimize the signaling overhead when performing sensing operations at the transmitter, this paper proposes a procedure to reduce the feedback rate. We consider...
The design of integrated sensing and communication (ISAC) systems has drawn recent attention for its capacity to solve a number of challenges. Indeed, ISAC can enable numerous benefits, such as the sharing of spectrum resources, hardware, and software, and improving the interoperability of sensing and communication. In this paper, we seek to provid...
Millimeter-wave (mmWave) communications promise Gigabit/s data rates thanks to the availability of large swaths of bandwidth between 10–100 GHz. Although cellular operators prefer the lower portions of the spectrum due to popular belief that propagation there is more favorable, the measurement campaigns to confirm this – conducted by ten organizati...
Beamforming training refers to the exhaustive scan over which the transmitter and receiver jointly steer their beams along a predefined set of double-directional angles to determine the beam pairs that coincide with the dominant propagation paths of the channel, for spatial multiplexing at millimeter-wave. When mobile, training necessitates a high...
We propose a 28.5-GHz channel sounder that switches through all antennas of multiple dual-polarized
$8 \times 8$
phased arrays at the transmitter and receiver and performs beamforming in postprocessing through digital weights to synthesize a sweepable beam. To our knowledge, we are the first to implement—what we refer to as—
switched beamforming...
Due to narrow beamwidth and channel sparseness, millimeter-wave receivers will detect much less multipath than their microwave counterparts, fundamentally changing the properties of the small-scale fading. By corollary, the de facto Rayleigh-Rice model, which assumes a rich multipath environment interpreted by the Clarke-Jakes omnidirectional ring...
Previous efforts to develop simulation and/or measurement-based channel propagation models for the effect of human blockage on millimeter-wave communication systems have yielded important results, but lack either accuracy, generality, or simplicity. To fill that void, in this paper we propose a hybrid geometrical-empirical model for human presence;...
This paper describes the calibration of the
Volcano
ray-tracing engine against channel measurements collected in an urban environment with a state-of-the-art 28-GHz directional channel sounder. A discrete set of rays, representing planar wavefronts propagating between the transmitter and receiver, were extracted from the measurements and characte...
Development of a comprehensive channel propagation model for high-fidelity design and deployment of wireless communication networks necessitates an exhaustive measurement campaign in a variety of operating environments and with different configuration settings. As the campaign is time-consuming and expensive, the effort is typically shared by multi...
Millimeter-wave channel sounders are much more sensitive to phase drift than their microwave counterparts by virtue of shorter wavelength. This matters when coherently combining untethered channel measurements – scanned over multiple antennas either electronically or mechanically in seconds, minutes, or even hours – to obtain directional informatio...
We describe a 60-GHz channel sounder with phased-array antennas and 1-GHz bandwidth. It estimates the angle of departure (AoD)/angle of arrival (AoA) of channel multipath components (MPCs) by sweeping the antenna space of the transmitter/receiver through 5.6° electronically steerable beams. The associated 26.1-dBi gain and resultant 36-dBm EIRP of...
The exponential increase in wireless data transmission from smartphones has led to the saturation of the sub-6-GHz bands where cellular networks have operated to date forcing providers to migrate to the millimeter-wave (mmWave) regime for 5G. Although available channel bandwidths will grow from tens of megahertz to several gigahertz, propagation lo...
Citations
... Smart "Internet of Things" (IoT) systems refer to interconnected networks of devices, sensors, and objects that communicate and interact, collect and analyze data, make smart decisions based on the accumulated data, and take actions that improve the systems' efficiency, productivity, and safety and security [1][2][3][4][5][6][7][8][9][10]. These systems leverage the capabilities of IoT and data science technologies, such as networking connectivity, data analytics, and automation, to enable intelligent and efficient operations across various application domains. ...
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... The receiver horn antenna is mounted on a robotic arm that traces out a 35 × 35 synthetic aperture that is perpendicular to the ground, while the transmitter horn antenna is fixed on a tripod. An optical camera system estimates the aperture positions of the robotic arm to within 100 µm [32]. ...
... characteristics [2]; recently, the 802.11ay has been standardized to address this challenge and enables wireless local area network (WLAN) devices to achieve transmission rates of up to 100 Gbps in the 60 GHz band [3]. ...
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... We use the same traffic generator for our system and all baselines. 2) Users angle estimation (initial access): We use the channel collected from mobile 28 GHz testbed [14], using switched beamforming techniques [15], [16] for user's angle estimation. We leverage the existing 5G NR SSB Beam scan [17] using an exhaustive search to estimate angles. ...
... This corresponds to the most favorable case for widesense stationarity. Misalignment causes the channel response to vary even more with displacement along the rail, the case we consider in [36]. ...
... When the target moves towards the communication link, the beams are overlapping, the LoS link vanishes and blockage occurs. In order to model the blockage, the following channel model from BS to the single antenna UE is considered with and without blockage [38,39]: ...
... Given the site-specific nature of InF scenarios and the recent interest in millimeter-wave (mmWave) frequency bands for industrial wireless networks, many channel and network performance metrics for mmWave communications have been lately generated through ray-tracing [8], [9]. Ray-tracing can be considered an interesting approach for radio propagation and characterization in InF scenarios. ...
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... It scrutinizes the impact of diverse building materials (including glass, wood, IRR glass, and concrete) and antenna properties in O2I scenarios. In [24], for indoor-to-indoor and O2I scenarios, an office building was utilized to analyze penetration losses across different incident angles, underscoring the substantial penetration loss experienced by a 60 GHz channel in indoor environments. Additionally, in [25], the terragraph sounder (TG) channel sounder tool, developed by META, serves as a practical instrument for measuring physical channel properties. ...
... Similarly, the work in [25] examined path loss propagation prediction and optimization, employing the popular Hata model at 800 MHz in an urban area. In a similar study, Gentile et al. [26] proposed a suitable methodology for benchmarking radio-frequency channel sounders through a system model. Te current contribution exploited an efcient parameter-based ML estimation model combined with the lognormal distribution function to estimate spatial variations of wireless propagated signals. ...
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... A different category of beamformer mismatch is when the transmitter and receiver are not synchronized. Very limited work has been reported on robust approaches that account for signal corruptions arising from carrier frequency offsets [17], [23], [24]. However, in highinterference and high-multipath environments, typically measuring the carrier frequency offset is not feasible and robust solutions are needed. ...
