DVB-S

Abstract: Satellite based Digital Video Broadcasting (DVB-S) allows the same low cost satellite dish to receive both television programs and Internet traffic The satellite system is used to construct a high-speed simplex distribution system, while the return path, needed for the Internet service will be provided using a low speed terrestrial network The bandwidth asymmetry between the return and forward paths results in a problem, which we have termed "ACK congestion" A number of techniques that may alleviate ACK congestion over a DVB satellite link are analysed through simulation The paper also presents a new ACK Compaction technique to eliminate ACK congestion, and an ACK spacing technique to preserve the self-clocking principle of TCP

Abstract: Drones and unmanned aerial vehicles (UAVs) are increasingly popular, thus posing danger and threats to infrastructures and public safety. A technology for drone detection and classification would therefore significantly increase the level of security. In scenarios such as concerts, sport events, trade fairs, or in any situation where significant aggregation of people is present, such techniques should be non-invasive. That means they do not have to pose an additional threat to people themselves. To this end, passive radars offer an appealing solution, since they are able to offer a non-cooperative surveillance while not emitting any electromagnetic signal. On the contrary, they rely on existing transmitting infrastructure (also referred to as illuminators of opportunity, IoO), such as broadcasting signal sources (FM radio, terrestrial and satellite digital video broadcasting, cellular communication and so on). In this work, the possibility to exploit satellite television based passive radar for UAV detection is analyzed by experimental validation. In addition, micro-Doppler signatures for drones have been extracted, which might give information for subsequent UAV classification.

Abstract: The MPEG-2 standard supports a range of transmission methods for a range of services. This document provides a threat analysis and derives the security requirements when using the Transport Stream, TS, to support an Internet network-layer using unidirectional lightweight encapsulation (ULE). The document also provides the motivation for link-level security for a ULE Stream. A ULE Stream may be used to send IPv4 packets, IPv6 packets, and other Protocol Data Units to an arbitrarily large number of receivers supporting unicast and/or multicast transmissions.

Abstract: A monolithic heterodyne receiver for digital video broadcasting via-satellite (DVB-S) applications is presented. The integrated circuit consists of a down-converter block and a phase-locked-loop-based local-oscillator synthesizer to translate the DVB-S RF-band (10.7-12.75 GHz) to an IF ranging in the L-band (0.95-2.15 GHz). The receiver exhibits a conversion gain of 38 dB, a single-sideband noise figure of 7 dB, and an output 1-dB compression point of +5 dBm. A 2.2-GHz-wide voltage-controlled oscillator (VCO) tuning range, extending from 8.6 to 10.8 GHz, is achieved adopting a transformer-based topology. The VCO phase noise is as low as -95 dBc/Hz at 100-kHz offset from a 10.6-GHz carrier. The integrated receiver draws 160 mA from a 3.3-V supply voltage. This paper demonstrates the feasibility of a Ku-band DVB-S heterodyne receiver integrated in low-cost 46-GHz-f/sub T/ silicon bipolar technology.