Proceedings ArticleDOI
Studies of pointing, acquisition, and tracking of agile optical wireless transceivers for free-space optical communication networks
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TLDR
The performance characteristics of these agile transceivers for pointing, acquisition, and tracking (PAT), including the influence of acceleration/deceleration time, motor angular speed, and angular re-adjustment, on latency and packet loss in small free space optical (FSO) wireless test networks are studied.Abstract:
Free space, dynamic, optical wireless communications will require topology control for optimization of network performance. Such networks may need to be configured for bi- or multiple-connectedness, reliability and quality-of-service. Topology control involves the introduction of new links and/or nodes into the network to achieve such performance objectives through autonomous reconfiguration as well as precise pointing, acquisition, tracking, and steering of laser beams. Reconfiguration may be required because of link degradation resulting from obscuration or node loss. As a result, the optical transceivers may need to be re-directed to new or existing nodes within the network and tracked on moving nodes. The redirection of transceivers may require operation over a whole sphere, so that small-angle beam steering techniques cannot be applied. In this context, we are studying the performance of optical wireless links using lightweight, bi-static transceivers mounted on high-performance stepping motor driven stages. These motors provide an angular resolution of 0.00072 degree at up to 80,000 steps per second. This paper focuses on the performance characteristics of these agile transceivers for pointing, acquisition, and tracking (PAT), including the influence of acceleration/deceleration time, motor angular speed, and angular re-adjustment, on latency and packet loss in small free space optical (FSO) wireless test networks.read more
Citations
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Journal ArticleDOI
Underwater Optical Wireless Communications, Networking, and Localization: A Survey
TL;DR: This work provides a comprehensive survey on the challenges, advances, and prospects of underwater optical wireless networks (UOWNs) from a layer by layer perspective which includes physical layer issues including propagation characteristics, channel modeling, and modulation techniques.
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Underwater Optical Wireless Communications, Networking, and Localization: A Survey
TL;DR: In this article, the authors provide a comprehensive survey on the challenges, advances, and prospects of underwater optical wireless networks (UOWNs) from a layer by layer perspective which includes: 1) Potential network architectures; 2) Physical layer issues including propagation characteristics, channel modeling, and modulation techniques 3) Data link layer problems covering link configurations, link budgets, performance metrics, and multiple access schemes; 4) Network layer topics containing relaying techniques and potential routing algorithms; 5) Transport layer subjects such as connectivity, reliability, flow and congestion control.
Journal ArticleDOI
Autonomous reconfiguration in free-space optical sensor networks
A. Desai,Stuart D. Milner +1 more
TL;DR: This research focuses on the physical and logical control and reconfigurability of network topologies through intelligent and dynamic rearrangement of nodes in an optical wireless sensor network, and investigates tradeoff between solution quality and computational time.
Proceedings ArticleDOI
Hybrid free space optical/RF networks for tactical operations
Stuart D. Milner,C.C. Davis +1 more
TL;DR: The key technologies under research and development include: topology and diversity control software; hardware for pointing, acquisition and tracking (PAT); and a combined aperture FSO/RF transceiver with joint PAT.
Proceedings ArticleDOI
Obscuration minimization in dynamic free space optical networks through topology control
TL;DR: This paper focuses on the design of efficient and scalable algorithms for physical layer topology optimization, that is, algorithms to select the topology configuration which optimizes a given physical layer objective.
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