Pointing, acquisition, and tracking considerations for mobile directional wireless communications systems

Rzasa, John R.; Ertem, M. C.; Davis, Christophér C.

doi:10.1117/12.2026691

Cited by 13 publications

(7 citation statements)

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“…To minimize the scanning delay, we propose splitting our scanning into two phases: acquisition and realignment. During the acquisition phase, we first calibrate once to get the environmental noise level for setting 𝑡ℎ𝑟𝑒𝑠ℎ𝑜𝑙𝑑 1 and then scan in an Archimedian spiral [4] pattern which is commonly used in FSO [78]. This pattern is useful for the acquisition stage as it can scan a large area in an efficient amount of time.…”

Section: Robust Link Acquisitionmentioning

confidence: 99%

Sunflower

Carver

Shao

Lensgraf

et al. 2022

Proceedings of the 20th Annual International Conference on Mobile Systems, Applications and Services

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Locating underwater robots is fundamental for enabling important underwater applications. The current mainstream method requires a physical infrastructure with relays on the water surface, which is largely ad-hoc, introduces a significant logistical overhead, and entails limited scalability. Our work, Sunflower, presents the first demonstration of wireless, 3D localization across the air-water interface -eliminating the need for additional infrastructure on the water surface. Specifically, we propose a laser-based sensing system to enable aerial drones to directly locate underwater robots. The Sunflower system consists of a queen and a worker component on a drone and each tracked underwater robot, respectively. To achieve robust sensing, key system elements include (1) a pinholebased sensing mechanism to address the sensing skew at air-water boundary and determine the incident angle on the worker, (2) a novel optical-fiber sensing ring to sense weak retroreflected light, (3) a laser-optimized backscatter communication design that exploits laser polarization to maximize retroreflected energy, and (4) the necessary models and algorithms for underwater sensing. Realworld experiments demonstrate that our Sunflower system achieves average localization error of 9.7 cm with ranges up to 3.8 m and is robust against ambient light interference and wave conditions. CCS CONCEPTS• Hardware → Sensor devices and platforms; Sensor applications and deployments.

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Section: Robust Link Acquisitionmentioning

confidence: 99%

Sunflower

Carver

Shao

Lensgraf

et al. 2022

Proceedings of the 20th Annual International Conference on Mobile Systems, Applications and Services

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“…In E-band long-range communication, the essential requirement for antennas, except for the gain performance, is steerable beam, since antenna mast movement can increase the risk of outage by introducing additional attenuation (see Figure 2 ). This is further discussed in [ 10 ]. In this regard, the high-gain reflector/lens antennas with mechanical alignment and phased arrays seem to be the winning solution.…”

Section: Review On System Designmentioning

confidence: 99%

Towards 100 Gbps over 100 km: System Design and Demonstration of E-Band Millimeter Wave Communication

Zhang

et al. 2022

Sensors

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Long-range E-band communication with fiber-equivalent speed is emerging extensively as a critical technology in the next-generation communication. This paper firstly reviews the relevant progress in recent research. A brief survey is presented on high-speed, long-range E-band communication systems and their relevant techniques that are essential to the link design, including antenna, power amplifier (PA), channel, and digital baseband processing. In the second part, we review our recent field trial of a long-range air-to-ground E-band link, which maintains steady transmission from a slow-moving helium balloon to the ground station with a vertical dimension of 20 km. The improvement directions and future research topics are then discussed.

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“…There is another body of work that deals with pointing, acquisition and tracking such as [2], [11], [12], [13] and [14]. The survey carried out by the authors in [2] is comprehensive, but the discussion focuses mainly on the hardware, such as the gimbal and mirror based steering PAT systems for tracking the beam position.…”

Section: L Rmentioning

confidence: 99%

“…The work [12] proposes gimbal less MEMS micro-mirrors for fast tracking of the time-varying beam position. The authors in [13] explore the acquisition performance of a gimbal based pointing system experimentally that uses spiral techniques for scanning the uncertainty region. Finally, the paper [14] carries out an experimental study in order to find an optimal beam radius that minimizes the bit error rate for a terrestrial channel that undergoes turbulence/scintillation effects.…”

Section: L Rmentioning

confidence: 99%

“…The following scanning techniques are typically used for the purpose of acquisition [22]: 1) Continuous spiral scan, 2) step spiral scan, 3) segmented scan, 4) and raster scan. Continuous spiral is the most common and efficient scanning technique [22], [8], [13]. Therefore, in this paper, we will 4The recipient may not detect the initiator's signal if the transmitted power is not sufficient.…”

Section: Scanning Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Signal Acquisition With Photon-Counting Detector Arrays in Free-Space Optical Communications

Bashir

Alouini

2020

IEEE Trans. Wireless Commun.

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Pointing and acquisition are an important aspect of free-space optical communications because of the narrow beamwidth associated with the optical signal. In this paper, we have analyzed the pointing and acquisition problem in free-space optical communications for photon-counting detector arrays and Gaussian beams. In this regard, we have considered the maximum likelihood detection for detecting the location of the array, and analyzed the one-shot probabilities of missed detection and false alarm using the scaled Poisson approximation. Moreover, the upper/lower bounds on the probabilities of missed detection and false alarm for one complete scan are also derived, and these probabilities are compared with Monte Carlo approximations for a few cases. Additionally, the upper bounds on the acquisition time and the mean acquisition time are also derived. The upper bound on mean acquisition time is minimized numerically with respect to the beam radius for a constant signal-to-noise ratio scenario. Finally, the complementary distribution function of an upper bound on acquisition time is also calculated in a closed form. Our study concludes that an array of smaller detectors gives a better acquisition performance (in terms of acquisition time) as compared to one large detector of similar dimensions as the array.

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Pointing, acquisition, and tracking considerations for mobile directional wireless communications systems

Cited by 13 publications

References 0 publications

Sunflower

Sunflower

Towards 100 Gbps over 100 km: System Design and Demonstration of E-Band Millimeter Wave Communication

Signal Acquisition With Photon-Counting Detector Arrays in Free-Space Optical Communications

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