Randall Olsen’s scientific contributions

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Publications (8)


A solution to network protocol issues for directional ad-hoc networks through topology control and a multiple-radio-per-node architecture
  • Conference Paper

November 2011

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61 Reads

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6 Citations

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Randall Olsen

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Christopher Meagher

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[...]

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Nathaniel Stevens

Line of Sight (LOS) communications and mobile networking are important capabilities for future military operations. Central to this idea is the desire for increased bandwidth and the ability to operate in the absence of satellite-based communications. A key concept in tactical edge wireless networks and airborne backhaul networks is the use of directional antennas to boost the performance of radio systems. As most current radio and wireless networking protocols were designed for omni-directional and/or fixed infrastructure environments, the use of directional antennas introduces disrupting side effects in many protocol layers of a networking system. Solving these issues is the topic of much current academic research. In this paper we describe a Multiple-Radio-per-node Architecture (MRA) that eliminates most of these problems. That is, our solution involves making changes to the architecture of a wireless node as an alternative to making changes to the design of network protocol layers. As a result, our architecture makes it possible to immediately build fully directional mobile ad-hoc networks (MANETs) using a wide range of radios without requiring major modification to the radio or existing protocols. Instead, the focus is on building a system of controllers that understand the capabilities of a given radio and implement appropriate discovery, tracking, and topology control algorithms.


Directional ad hoc networking technology (DANTE) performance at sea

November 2011

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124 Reads

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15 Citations

SPAWAR Systems Center Pacific has spent several years developing directional wireless networks. These networks harness the power of highly directive antennas (range extension, higher data rates, lower power consumption, etc.) and have software to deal with the additional beam-steering complexity. The directional networking technology, DANTE, is outlined first. Three Trident Warrior at-sea tests of DANTE are then described, with summaries of each of their successes and limitations. Finally, we briefly relate ongoing DANTE-2 research efforts on the antennas and networking software.



Semi-automated Rotman lens design focusing on anti-jam performance

August 2010

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18 Reads

In this paper, the authors introduce the need for semi-automating the design of Rotman lenses and describe steps taken at SPAWAR Systems Center Pacific (SSC-PAC) to address this need. With this semi-automated design tool, the authors have been able to design several different lenses and not only verify their individual performance but compare key traits such as phase/magnitude error and insertion loss amongst all the lenses and against some lenses reported in the literature. These traits are important in improving antijam/interference performance of a Rotman lens-based wireless communications system.


Network solutions for employing COTS radios in multi-sector directional architectures

December 2008

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73 Reads

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5 Citations

Central to this paper is the use of electronically-steered directional antennas with COTS radio technology to increase performance. In this paper, we describe a multi-sector wireless architecture using several such radios/antennas in a complete system. We discuss networking issues and solutions that arise due to this architecture including link discovery, signal tracking, handover, and the coordination of these between nodes. We also introduce the concept of using a ldquogateway aliasrdquo which provides transparent routing by allowing multiple radios to appear as a single node. The system has been implemented using high gain, switched-beam directional antennas and tested in an operational environment. Results and future direction are discussed.


Physical simulation of long distance and directional wireless channels

December 2008

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23 Reads

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1 Citation

In order to accurately test directional or multiplexed systems in a lab environment, a testbed should simulate both directional wireless channels and propagation delay. Using one or more RF lenses, one can test a radio system that uses switched or adaptively steerable antennas: one side is switched by an ldquoenvironmentrdquo controller, the other by the the discovery and tracking loop of the radio system. True path delay testing can be done by using analog RF-to-optical converters and miles of low-cost, low-loss fiber optics. Apart from verifying latency, this test can also determine if there are issues with ACK or other timeouts: information unavailable by simply attenuating a link to simulate distance.


Spatially Aware Wireless Networks (SPAWN) for Higher Data Rate and Range Performance with Lower Probability of Detection

December 2007

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32 Reads

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4 Citations

Technical solutions are needed to provide affordable, high-capacity wireless communications to United States Navy (USN) forces by exploiting commercial off-the-shelf (COTS) technologies. There is also a pressing need to extend battlespace connectivity within a theater of operations, particularly for littoral and expeditionary warfare operations. Such requirements dictate the use of directional or "spatially aware" wireless networks, enabled by low cost, electronically-steered antennas. A phased array antenna system of this type has been implemented using Rotman lens technology, and antenna control applications and directional protocols are under development.


Broadband electronically-steerable array for mission security (BEAMS)

July 2007

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9 Reads

Technical solutions are needed to provide affordable, high-capacity wireless communications services to the US Navy (USN) by employing commercial off-the-shelf (COTS) technology that is Internet Protocol (IP) ready. There is a pressing need to extend battle space connectivity within a theater of operations, particularly for littoral and expeditionary warfare. The use of unmanned aerial vehicles (UAVs) with lightweight communications relay packages can provide this extended range capability for networks of users. Phased array antennas, a complementary enabling technology, brings with it the additional major challenge of being tailored to and operating in a 'networked' environment.

Citations (4)


... Then, the multiple-radio-perplatform architecture is introduced. 4 A single carrier platform has multiple radios; each tied to a phasedarray antenna. With this architecture, the carrier can communicate with the nearby neighbor in any direction without blocking or shadowing. ...

Reference:

A low-delay information sharing algorithm for multiple-radio-per-platform networking
A solution to network protocol issues for directional ad-hoc networks through topology control and a multiple-radio-per-node architecture
  • Citing Conference Paper
  • November 2011

... Directional wireless links (i.e., radio transmission and receiving with directional antennas) play an important role in the emerging 5G cellular systems [1]- [3] and other communications systems [4]- [7]. Directional wireless links are particularly attractive to military tactical applications [8]- [11]. In addition to the capacity improvement due to higher antenna gains, directional links provide excellent anti-jamming (AJ) performances [12]- [15], beneficial to the electromagnetic spectrum dominance strategies. ...

Directional ad hoc networking technology (DANTE) performance at sea
  • Citing Article
  • November 2011

... Having multiple radios allows them to be placed near their corresponding directional antenna, thus removing the need for expensive, lossy RF cable runs. The only drawback in this second architecture is the need for software to keep track of which radios are being used [1]. ...

Network solutions for employing COTS radios in multi-sector directional architectures
  • Citing Conference Paper
  • December 2008

... The two most important issues for this type of tracking are 1) How long can you stay off the current, working beam without breaking the link? and 2) How long must you dwell on the sampled beam to get an adequate power reading? Using the physical simulation system described in [5], we found that 50ms was sufficient to get an accurate power reading, as long as some data was being pushed across the link. This is because signal strength as reported by 802.11 radios is calculated upon the receipt of a packet by the data link layer. ...

Physical simulation of long distance and directional wireless channels
  • Citing Conference Paper
  • December 2008