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Wireless cameras can be used to gather situation awareness information (e.g., humans in distress) in disaster recovery scenarios. However, blindly sending raw video streams from such cameras, to an operations center or controller can be prohibitive in terms of bandwidth. Further, these raw streams could contain either redundant or irrelevant information. Thus, we ask "how do we extract accurate...
Individual optimization of sensor data transport over a fixed network or designing a network around fixed sensor data distribution requirements is less efficient than joint optimization. Simplified rules and methods of estimating bandwidth and planning networks are needed to tackle the more complex problem of joint optimization. A process of estimating and combining steady-state and burst data flows...
Compression of science data for space missions is an established technique whereas data compression of housekeeping telemetry is rare. This paper questions this state of affairs and we investigate the potential advantages and disadvantages of the latter. Using real data from the ROSETTA spacecraft we describe a set of experiments demonstrating that massive compression of housekeeping data can be achieved...
The four-aperture element for the double-layer corporate-feed hollow waveguide slot array has reflection below -15 dB over 9.5% bandwidth assuming the mutual couplings by the periodic boundary walls.
Bandwidth limitations restrict the frame rate and resolution of video feeds transmitted to users in wireless surveillance networks. This paper investigates whether Dynamic Preference Specification (DPS), which gives users the ability to dynamically specify preferences regarding frame rate and resolution, positively affects the ability to achieve surveillance tasks. User preference information is used...
Dual-resonant double square ring elements are applied to the design of a four-layer transmitarray operating at 30 GHz. The design procedure is described and results of a 7.5% -1 dB gain bandwidth and 47% radiation efficiency are reported.
Three different RF chain architectures operating in the FSS (fixed satellite services) + BSS (broadcast satellite) spectrum are presented and discussed. The RF chains are based on a common wideband corrugated feed horn, but differ on the approach used for bands and polarizations separation. A breadboard of a novel self-diplexed configuration has been designed, manufactured and tested. It proves to...
Broadcatching is a promising mechanism to improve the experience of BitTorrent users by automatically downloading files advertised through RSS feeds. However, though widely used, the mechanism itself has not been well studied. In this paper, we conducted extensive experiments on PlanetLab to evaluate the performance of Broadcatching under different typical scenarios. The results demonstrated the effectiveness...
This paper focuses on the axial ratio bandwidth, and gives out the theoretical computation of the axial ratio bandwidth of a multiple-feed microstrip antenna. The more feeds, the better the axial ratio is. When using multiple-feed for one patch, sequential rotation technology can be adopted. Starting from the mechanism of circular polarization obtaining from multiple-feed method, the detail analysis...
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