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Space missions management requires to cope with a number of different issues, among which the need of properly handling contacts among one or more ground antennae, and one or more satellites belonging to a space mission. The manuscript presents a planning approach designed to support the automatic allocation of contact opportunities among a set of ground stations and a set of satellites, with the...
This paper discusses the possible application of an innovative set of binary sequences, the De Bruijn ones, for spread spectrum applications, in which it may be useful to have a quite huge set of sequences to allocate different users, in order to avoid interference among them. The sequences are evaluated and compared to more traditional sets (Gold and Chaotic sequences) by means of the Periodic Ambiguity...
Remote home care, enabled by Information and Communication Technologies, plays an important role in the delivery of pervasive health services. One of the most challenging drivers in the deployment of pervasive health care solutions is the population ageing phenomenon. In this paper, we present a wireless, home-centered, health monitoring system architecture that can efficiently manage medical devices...
Limiting the power consumption to increase the lifetime of the nodes is a basic issue in wireless sensor networks. The energy efficiency requirement becomes essential in specific scenarios, like the one related to in-body networks of implantable biomedical sensors: prolonging the battery lifetime is of primary importance. A suitable design of the communication protocol and transmission technique may...
Modern home data networks based on the IP paradigm are nowadays conceived to support either the delivery of multimedia contents, and different services, such as home automation (e.g. household appliances commands, lighting and surveillance controls), and assisted living functions. A common delivery infrastructure, however, seldom corresponds to a unified service supply. This paper presents an interactive...
Code division multiple access (CDMA) using direct sequence (DS) spread spectrum modulation provides multiple access capability essentially thanks to the adoption of proper sequences as spreading codes. The ability of a DS-CDMA receiver to detect the desired signal relies to a great extent on the auto-correlation properties of the spreading code associated to each user; on the other hand, multi-user...
This paper presents preliminary evaluations about the possible adoption of de Bruijn sequences as an alternative to more conventional spreading codes in direct sequence spread spectrum automotive radars. The main advantage in using binary de Bruijn sequences relies in their huge cardinality with respect to any other family of binary sequences, at a parity of length. A huge cardinality represents a...
This paper deals with the analysis of the correlation properties, and radar-related properties, of a family of binary sequences known as De Bruijn sequences. They are considered in the framework of Spread Spectrum applications, and compared to other solutions, such as those adopting chaos-based sequences. Due to the complexity of the generation process, the analysis of De Bruijn sequences is limited...
High definition (HD) is showing an increasing popularity not only among professional and high cost video communication systems, but also among consumer devices. The aim of this paper is to investigate the adoption of HD in H.264/AVC video codecs for videoconference applications, where real time constraints, like short time delay, must agree with low complexity and computational costs. In order to...
This paper deals with the possibility of improving the concealment effectiveness of an H.264 decoder, by means of the integration of a scene change detector. This way, the selected recovering strategy is driven by the detection of a change in the scene, rather than by the coding features of each frame. The scene detection algorithm under evaluation has been chosen from the technical literature, but...
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