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The study of electrically small radiofrequency (RF) antenna elements is of both practical and fundamental importance. From a practical standpoint, emerging applications such multi-input multi-output (MIMO) mobile communications systems and RF-tagging benefit from the ability to make antenna size smaller. In this paper, we consider the use of materials with negative electric permittivity as a building block for constructing effective small antenna elements. Although such materials do not occur naturally at microwave frequencies, negative permittivity can be realized at microwave frequencies using plasmas of the appropriate charge density.
Wireless geolocation (position determination) may be accomplished via many techniques. RSS techniques are interesting due to their simplicity and generality, and can be accomplished from a set of reference stations radiating any set of waveforms. This motivates the idea of performing RSS-type positioning from a set of Signals-of-Opportunity (SoO) that happen to be in a local area (e.g. commercial radio, TV sources, etc.). The large number of potential sources helps improve the location accuracy.
A penetration test is a method of evaluating the security of a target by simulating an attack. Because multi-step attacks are often the most effective way for an attacker to compromise a system or network, we consider the problem of automatically designing a penetration test to remotely evaluate the security of a target computer or network device.
This white paper will cover switching system IP transformation with the ALU 5060 IP Call Server (5060 ICS). The 5060 ICS realizes a standards-based Voice and Video over IP (VVoIP) solution implemented in the Industry’s open standard, IP Multimedia Subsystem (IMS), for converged voice, data and video, or multimedia, communications.
Faster, more powerful and dense computing hardware generates significant heat and imposes considerable data center cooling requirements. The primary benefits of the LGS cooling solution include reduced energy requirements, optimized utilization of data center space, and lower OPEX and CAPEX.
Cloud solutions from LGS Innovations provide on-demand network access with sufficient bandwidth and carrier grade redundancy for mission-critical services and applications. This white paper addresses the networked data center (including Cloud and application assurance solutions).
The consideration of content-centric networking as a fundamental driver for mobile ad-hoc network (MANET) protocol design, including systematic evaluation of the suitability and effectiveness of existing approaches toward designing a content-centric MANET.
We demonstrate a record receiver sensitivity of 2.7 photons per bit at 6.23-Gb/s net data rate using PDM-QPSK with 4-ary-pulse-position-modulation. This signal is transmitted over a 370-km unrepeatered ultra-large-area-fiber span with 71.7-dB total loss budget.
Government agencies and departments can minimize the complexity, mitigate the risks, and reduce the costs of deploying wireless microwave systems with solutions from LGS Innovations.
A power-efficient modulation/detection scheme from LGS Innovations to improve the receiver sensitivity in optical communication systems, particularly for space communications.
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