The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The Scalable Video Coding (SVC) is an extension of H.264/AVC offering temporal, spatial, and quality scalability. Compared to the non-scalable profile of H.264/AVC, SVC allows layered transmission of video data. Variable Coding and Modulation (VCM) based DVB-S2 Video Broadcasting Systems enables effective selection of modulation modes and FEC code-rates offering differentiated error protection. In...
Future deep space missions are envisioned to implement the Delay Tolerant Network architecture and to offer very high data rate also towards remote planets to support possible human missions. In this perspective, the need for advanced transmission paradigms and reliability means is needed to ensure the success of such missions. On the one hand, the CCSDS protocol implemented at the application and...
Dimensioning the mobile link for aeronautical communications between aircraft and the satellite is a critical issue due to the limited power available, in particular if an omnidirectional antenna is used on board the aircraft. Also there are large channel variations due to the different effects occurring on the L-band mobile link and over-dimensioning of the user terminal or satellite should be avoided...
This paper presents current status, progress and next steps of the largest standardization effort conducted for satellite communication systems. We highlight the process, in order to understand the mechanisms involved, and novel technology elements. We also allow ourselves to speculate on the possible impact this work can have for the satellite community and see how opportunities for some interesting...
In this paper we extend the analysis of by comparing delay in protocols using retransmission and packet encoding for bidirectional unicast communication over a satellite channel, where the signal propagation delay is significant. We derive results on the total sender-receiver delay based on analysis and computer simulation for a Bernoulli packet arrival distribution.
DVB-SH (Digital Video Broadcasting- Satellite Handled) is a broadcasting standard dedicated to hybrid broadcasting systems combining a satellite and a terrestrial part. On the satellite part, dedicated interleaving and time slicing mechanisms are proposed to mitigate the effects of Land Mobile Satellite (LMS) channel, based on a convolutional interleaver. Depending on the parameters of this interleaver,...
The following topics are dealt with : network coding; automatic identification system; delay tolerant networks; modulation and coding; system architecture; estimation and synchronization theory; multibeam communication; cooperative communication; spectrum sharing; navigation and positioning; signal processing; communication theory; S-band system; and network protocol.
We analyze a wireless communication system in which channel coding is applied to both physical and upper layer. In this scenario, we study the splitting of redundancy between the coding schemes applied to the two layers. Considering a frequency-flat, slowly varying fading channel, we derive the optimum splitting value for a given signalling format. The theoretical analysis is validated by means of...
Mobile terminals communicating through satellite suffer from low channel quality due to the combination of slow and fast fading and limited battery power. Moreover, the advanced applications proliferating over such terminals forbids the use of feedback based packet retransmission schemes over satellite due to their high latency, exceeding three times the round trip time. These feedback based packet...
The benefits of network coding in terms of throughput, security and robustness are well understood for a large class of networks, such as wireless mesh networks and peer-to-peer systems. We ask if similar performance enhancements can be attained in satellite based communications. Our feasibility study focuses on GEO satellite communication systems including regenerative payloads and multi spot-beam...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.