2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)最新文献

{"title":"CRDSA, CRDSA++ and IRSA: Stability and performance evaluation","authors":"Alessio Meloni, M. Murroni","doi":"10.1109/ASMS-SPSC.2012.6333080","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333080","url":null,"abstract":"In the recent past, new enhancements based on the well established Aloha technique (CRDSA, CRDSA++, IRSA) have demonstrated the capability to reach higher throughput than traditional SA, in bursty traffic conditions and without any need of coordination among terminals. In this paper, retransmissions and related stability for these new techniques are discussed. A model is also formulated in order to provide a basis for the analysis of the stability and the performance both for finite and infinite users population. This model can be used as a framework for the design of such a communication system.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114214563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A simple high precision method for extrapolating Sat-AIS system performance","authors":"E. Re, V. Boissinot, A. Ginesi, C. Tobehn","doi":"10.1109/ASMS-SPSC.2012.6333087","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333087","url":null,"abstract":"SAT-AIS is gaining momentum thanks to the push of the users and to the different ongoing institutional and private initiatives. System performance characterization is a central task for the system design, as the constellation has to be sized efficiently to meet the user requirements. However due to the complexity of the systems, often composed of more than 10 satellites in a LEO constellation, this characterization can be extremely time consuming when a full processing approach is undertaken. This paper presents a method for extrapolating the system performance of a SAT-AIS constellation based on a partial characterization of the detection technology onboard the satellites of the constellation. An extensive validation of the extrapolation technique was carried out thanks to the valuable data collected by ESA in the frame of the Comparative Performance Assessment (CPA) carried out between the end of 2011 and beginning of 2012. Thanks to these data, the method was tested against full processing simulations for different systems, and was proven to be extremely accurate.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125820359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SB-SAT- Persistent data communication LEO spacecraft via the Inmarsat-4 GEO constellation","authors":"B. Johnston, M. Haslam, E. Trachtman, R. Goldsmith, H. Walden, P. McGaugh","doi":"10.1109/ASMS-SPSC.2012.6333079","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333079","url":null,"abstract":"This paper provides a high level overview of the new SB-SAT technology which is being developed. The terminal and service capabilities deliver a “disruptive” technology which is a paradigm shift in the way data is relayed to and from LEO spacecraft. It will allow the deployment of smaller and cheaper LEO missions that require frequent communication contacts in the near-earth environment. Future variants of the system will allow deeper penetration of the product onto the market for LEO data transfer and once deployed this system should revolutionize many aspects of LEO satellite operations and management.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129016948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing an efficient communications protocol to deliver alert messages to the population during crisis through GNSS","authors":"Tomaso de Cola, J. Chaves, C. P. Niebla","doi":"10.1109/ASMS-SPSC.2012.6333068","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333068","url":null,"abstract":"Multi-channel Early Warning Systems are currently used to warn the population at risk and reduce the impact of crisis. Nevertheless, satellite networks, which offer robust and reliable communication solutions during major disaster events, are not yet being fully considered for direct communication to the citizens. The paper will address solutions for the transmission of alert messages to warn/inform the population in risk during crisis through GNSS. The solution proposed is based on a protocol for alert messages that is compatible with the Common Alert Protocol (CAP), but lightweight in comparison with CAP, so that it can be applied over a variety of communication links, i.e. over different communication standards, even in very narrow band channels, such as Satellite-Based Augmentation System (SBAS). The paper will analyse the opportunities and implications of using GNSS to disseminate alert messages to the population and propose the principles for a flexible protocol that allows the translation of CAP messages (XML-based) into a very flexible and lightweight protocol for transmission in very narrow band channels.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124790812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance analysis of the S-MIM messaging protocol over satellite","authors":"A. Recchia, F. Collard, Natalia Antip","doi":"10.1109/ASMS-SPSC.2012.6333110","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333110","url":null,"abstract":"In this paper we present experimental results of the ETSI S-MIM (S-band Mobile Interactive Multimedia) protocol, tested for the first time over a real GEO satellite (EUTELSAT 10A) and through a fully compliant ground platform. In particular, the employed radio interface implements the Part 3 of the standard, i.e. the asynchronous access protocol, especially conceived for the interactive messaging services. The performance assessment done by satellite validates the theoretical results and opens the way for the exploitation of low-power mobile and fixed terminals, thus allowing the proliferation of satellite mass market applications.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"7 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127017762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Satellite cognitive communications: Interference modeling and techniques selection","authors":"S. Sharma, S. Chatzinotas, B. Ottersten","doi":"10.1109/ASMS-SPSC.2012.6333061","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333061","url":null,"abstract":"Due to increasing demand of high speed data rate for satellite multimedia and broadcasting services and spectrum scarcity problem in satellite bands, exploring new techniques for enhancing spectral efficiency in satellite communication has become an important research challenge. In this aspect, satellite cognitive communication can be considered as a promising solution to solve spectrum scarcity problem. In this paper, different cognitive techniques such as underlay, overlay, interweave and database related techniques are discussed by reviewing the current state of art. Exact beam patterns of a multi-beam satellite are plotted over the Europe map and interference modeling between terrestrial Base Station (BS) and satellite terminal is carried out on the basis of interference power level. Furthermore, suitable cognitive techniques are proposed in high and low interference regions in the context of satellite cognitive communication.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114639214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Code acquisition under strong dynamics: The case of TT&C for LEOP","authors":"Giulio Gabelli, G. Corazza, L. Deambrogio, R. Casile","doi":"10.1109/ASMS-SPSC.2012.6333098","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333098","url":null,"abstract":"This paper tackles the issue of code acquisition of Spread Spectrum (SS) signals used for Telemetry, Tracking and Control (TT&C) of satellites operating in the Launch and Early Orbit Phase (LEOP). Peculiar to this scenario is the very low signal to noise plus interference ratio, that requires very accurate frequency estimation during code acquisition in order to guarantee the lock of the tracking loops. In this work we introduce a multi-dwell architecture composed of a first detection stage, aimed to perform coarse measurements of code delay and frequency offset, and a refinement stage in which very accurate estimations of signal frequency offset and Doppler rate are carried out. The proposed methods are tested by means of numerical simulations in terms of estimation accuracy and mean acquisition time and compared with classical code acquisition strategies, yielding compelling results and proving their effectiveness.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125728814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integration between telecommunication, navigation and earth observation systems for crisis response management","authors":"J. Cote, N. Chuberre, Bertrand d'Armagnac, L. D. Monte, Charlotte Mathieu","doi":"10.1109/ASMS-SPSC.2012.6333067","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333067","url":null,"abstract":"With an increasingly capable and complex European Security landscape, Space technologies are playing a vital role in crisis response both within Europe and across the globe. In this domain, Europe is developing capabilities to address many useful space technology applications that are directly applicable to both civilian and security needs. As expressed by various actors in the civil security and defense domains, there is a need for operational and sustainable space-based services that would be more responsive, integrated and under European control (i.e. based on European assets) through the combination of services provided by the different domains of space applications such as Earth observation, telecommunications and navigation. In the frame of the \"European Integrated Space Architectures for Crisis Response\" study led by Thales Alenia Space (T AS), and funded and supported by ESA, several crisis scenarios have been thoroughly analyzed in order to identify the needs of all the crisis response stakeholders in terms of telecommunication, observation and navigation services. A trade-off has been carried out on existing and planned space and non space assets to fulfill the mission requirements and led to identify some gaps which can be removed by innovative space assets. From an aggregation of existing and planned assets operating with various standards, spectrum and non interoperable terminals and networks that will be available in 2015, the study led to propose a reduced set of new space assets to fulfill the crisis response requirements that could not be addressed by non space assets only. Through an integrated and harmonized approach, the infrastructure foreseen at the 2025 time horizon will make it possible to improve the management of natural disasters, piracy or oil-spills wherever it may occur and efficiently support the European security policy and the external action service for the benefit of all member states at optimized overall cost. This article presents the main findings of the study. In particular, it discusses the main mission requirements that new assets dedicated to crisis management will have to fulfill.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132949836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LTE trials in the return channel over satellite","authors":"V. Jungnickel, H. Gäbler, U. Krueger, K. Manolakis, T. Haustein","doi":"10.1109/ASMS-SPSC.2012.6333083","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333083","url":null,"abstract":"Integrating terrestrial and satellite communications promises several advantages, whereas the most evident one is that modern satellite networks achieve global coverage using a multiple spot beam architecture. In order to increase the spectral efficiency, orthogonal waveforms like single-carrier frequency-division multiple access (SC-FDMA) are investigated recently. In this paper, we verify experimentally that SC-FDMA waveforms taken from the 3GPP Long Term Evolution (LTE) standard can be transmitted reliably in the return channel over satellite using low-cost equipment. Mainly, we introduce an additional timing advance offset depending on satellite elevation and geographical location. And we ensure that precise information about the frequency offset measured in the forward channel is reused for compensation in the return channel at each terminal. We demonstrate in real-time transmission experiments over a geostationary Ku-band satellite that all modulation formats defined for the up-link in the LTE Release 8 standard can be decoded error-free. Using 16-QAM, we have realized a spectral efficiency of 3.2 bits/s/Hz.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133723369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of carrier and channel parameters for land-mobile satellite channels","authors":"W. Gappmair, M. Bergmann, O. Koudelka","doi":"10.1109/ASMS-SPSC.2012.6333096","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333096","url":null,"abstract":"Information about the channel state is particularly useful for adapting transmission parameters to different fading conditions. With slowly fading channels, the signal-to-noise ratio (SNR) is the most significant figure of merit to obtain the required goals in terms of availability and throughput. Using mobile satellite links, however, the situation may change within the round-trip time. Therefore, not just SNR estimates have to be delivered to the transmitter station in the context of an adaptive coding and modulation strategy, but also some additional information about the signal-to-interference ratio (SIR) and, perhaps more important, the Doppler spread of the mobile link, which determines the amount of variation in time. Assuming a channel determined by correlated Rician fading, an appropriate estimation framework for carrier frequency and phase, SNR, SIR, and Doppler spread will be discussed in the current paper. The signal model reflects in principle the conditions on a time-selective land-mobile satellite link, whereas frequency selectivity - as it is typical for multipath propagation - is considered to be negligible.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114500334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}