Randall Olsen's scientific contributions
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Publications (8)
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 out...
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 dire...
We discuss novel methods and techniques for the design and development of low cost light weight directional antennas at microwave frequencies for unmanned system communications application. These are based on Rotman lens, Risley prism and the multi-horn switched beam antenna principles.
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 t...
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 dis...
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...
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. Su...
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 expeditiona...
Citations
... 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. ...
... 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. ...
... 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]. ...
... 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. ...
