2007 International Workshop on Satellite and Space Communications最新文献_第3页

Network and Mobility Management for Mobile DVB-S2/DVB-RCS systems 移动DVB-S2/DVB-RCS系统的网络和移动性管理

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409428

A. Iuoras, C. Morlet

引用次数: 2

Relative localization in 802.11/GPS systems 802.11/GPS系统中的相对定位

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409432

D. Giustiniano, F. Lo Piccolo, N. B. Melazzi

引用次数: 2

Scintillation Time Series Synthesis for Satellite Links with Hidden Markov Model 基于隐马尔可夫模型的卫星链路闪烁时间序列综合

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409384

L. Csurgai-Horváth, J. Bitó

{"title":"Scintillation Time Series Synthesis for Satellite Links with Hidden Markov Model","authors":"L. Csurgai-Horváth, J. Bitó","doi":"10.1109/IWSSC.2007.4409384","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409384","url":null,"abstract":"This paper introduces a method to model the rapid attenuation fluctuations (the scintillation) on satellite links with generating the time series of attenuation levels. The applied model is a hidden Markov model which is parameterized from an appropriate filtered Gaussian white noise signal. For the parameterization of the Markov chain the Baum-Welch expectation-maximization algorithm has been used. The resulting Markov model is applicable to generate scintillation time series for any desired duration with the time and amplitude resolution of the original training data. From the synthesized time series the statistical properties like the cumulative distribution and the dynamics of the scintillation can be also determined. To prove the accuracy of the model at first the cumulative distribution function of the original and synthesized time series are compared. A further test of the model validity is the comparison with real scintillation measurement on a land mobile satellite link. Finally, the spectral test of the filtered Gaussian model, the hidden Markov model and the satellite link measurement shows that the constant and decreasing parts in the periodograms are showing similarities what confirms the good quality of the model.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121700968","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}

引用次数: 0

Delay-based Sub-grouping for NORM in Heterogeneous Networks 异构网络中基于时延的NORM子分组

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409404

C. Kulatunga, G. Fairhurst

{"title":"Delay-based Sub-grouping for NORM in Heterogeneous Networks","authors":"C. Kulatunga, G. Fairhurst","doi":"10.1109/IWSSC.2007.4409404","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409404","url":null,"abstract":"The IETF Negative Acknowledgement (NACK) Oriented Reliable Multicast (NORM) protocol offers an attractive solution for small groups that do not have significant receiver heterogeneity. It avoids many of the problems associated with Asynchronous Layered Coding (ALC), such as complexity, Internet Group Management Protocol (IGMP) and routing overhead, lack of TCP friendliness and data duplication. NORM uses a combination of a representative and suppression based approach for reliability and congestion control to avoid multicast feedback implosion. The group's Maximum Round Trip Time (MRTT), maintained at the sender, becomes a metric in this scheme. A large MRTT makes the NORM services very unresponsive. NORM can also be deployed in a heterogeneous network environment where the RTT may differ considerably between sets of users in the network due to their differing propagation delay. An example is when some of the NORM receivers operate over a satellite network, driving the MRTT to a high value. In some satellite scenarios, e.g Digital Video Broadcast - Return Channel via Satellite (DVB-RCS), the feedback packets have to contest for return-path link access. This can lead to large variations in the RTT and results in a MRTT considerably higher than the average RTT. This paper investigates the situations where the NORM framework could be inefficient. By considering the impact on the MRTT, a new mechanism is proposed based on delay-based receiver grouping. This improves the performance of NORM in heterogeneous network environments, including those provided by DVB-RCS satellite networks.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115431246","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}

引用次数: 0

Analytical and Experimental IP Encapsulation Efficiency Comparison of GSE, MPE, and ULE over DVB-S2 GSE、MPE和ULE在DVB-S2上IP封装效率的分析和实验比较

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409401

A. Mayer, B. Collini-Nocker, F. Vieira, J. Lei, M. Vazquez Castro

引用次数: 28

Indoor fading distributions for GPS-based pseudolite signals 基于gps伪卫星信号的室内衰落分布

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409381

A. K. M. Najmul Islam, E. Lohan, E. Pajala, M. Renfors, A. Lakhzouri, H. Laitinen

引用次数: 10

A Priority Paradigm for Deep Space Data Communication 深空数据通信的优先级范式

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409414

M. Ramadas, Shawn Ostermann, Hans Kruse

引用次数: 5

Exact Analysis of Different Detector Algorithms for NDA Carrier Phase Recovery of 16-APSK Signals 不同检测器算法对16-APSK信号NDA载波相位恢复的精确分析

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409389

W. Gappmair, O. Koudelka, S. Cioni, A. Vanelli-Coralli

引用次数: 7

On the Optimization of Signal Constellations for Satellite Channels 卫星信道信号星座优化研究

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409383

E. A. Candreva, G. Corazza, A. Vanelli-Coralli

引用次数: 5

Joint Symbol Timing and Carrier Frequency Recovery for DVB-SH System DVB-SH系统的联合符号定时和载波频率恢复

2007 International Workshop on Satellite and Space Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSSC.2007.4409394

S. Rosati, S. Cioni, M. Neri, A. Vanelli-Coralli, G. Corazza

引用次数: 5