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Design of long time interleaver for future S-DMB services 面向未来S-DMB业务的长时间交织器设计
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656816
Sooyoung Kim, Jongsu Lee, Jonghoon Lee, S. Yeo, S. Song, H. Kim, D. Ahn
{"title":"Design of long time interleaver for future S-DMB services","authors":"Sooyoung Kim, Jongsu Lee, Jonghoon Lee, S. Yeo, S. Song, H. Kim, D. Ahn","doi":"10.1109/IWSSC.2008.4656816","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656816","url":null,"abstract":"In this paper, we present an efficient interleaver, designed for future personal mobile satellite services. Burst errors incurred by long term fading of mobile satellite channels will seriously degrade the service quality. Interleaving is an effective solution to this situation, by randomizing the errors before the channel decoders. This paper describes the design and the simulation results of a convolutional interleaver for personal mobile satellite system based on orthogonal frequency division multiplexing (OFDM) transmissions, especially IEEE mobile WiMax specification. We first analyze long term fading characteristics of mobile satellite channels, and analyze the simulation results of bit error rate (BER) performance according to various system parameters and channel conditions.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125517521","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: 2
Channel allocation algorithm for novel polarization tracking free Ku-band mobile satellite communication systems 新型无极化跟踪ku波段移动卫星通信系统的信道分配算法
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656752
K. Nakahira, K. Kobayashi, K. Ohata
{"title":"Channel allocation algorithm for novel polarization tracking free Ku-band mobile satellite communication systems","authors":"K. Nakahira, K. Kobayashi, K. Ohata","doi":"10.1109/IWSSC.2008.4656752","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656752","url":null,"abstract":"We have developed a new channel allocation algorithm for use with a new Ku-band mobile satellite communication system that is being developed as a separate piece of work. The system enables new Earth stations to use a low cost polarization tracking free antenna. To expand system flexibility, the new Earth stations and conventional earth stations are hoped to share a satellite transponder. However, the problem is that the satellite transponder sharing significantly increases cross polarization interference. Our algorithm overcomes the problem. It takes into account station types and maintains assigned channels so as not to increase cross polarization interference and to reduce wasteful bandwidth gaps in the satellite transponder. We simulated channel allocation under various traffic conditions on a computer in order to test our algorithmpsilas performance. The results showed that our algorithm can increase the accommodation number of stations and achieves a low cross polarization interference.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126936907","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: 6
A compact microstrip antenna with tapered peripheral slits for CubeSat RF Payloads at 436MHz: Miniaturization techniques, design & numerical results 用于436MHz立方体卫星射频有效载荷的具有锥形外围狭缝的紧凑型微带天线:小型化技术，设计和数值结果
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656804
C. Kakoyiannis, P. Constantinou
{"title":"A compact microstrip antenna with tapered peripheral slits for CubeSat RF Payloads at 436MHz: Miniaturization techniques, design & numerical results","authors":"C. Kakoyiannis, P. Constantinou","doi":"10.1109/IWSSC.2008.4656804","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656804","url":null,"abstract":"We elaborate the design and simulation of a planar antenna that is suitable for CubeSat picosatellites. The antenna operates at 436 MHz and its main features are miniature size and the built-in capability to produce circular polarization. The miniaturization procedure is given in detail, and the electrical performance of this small antenna is documented. Two main miniaturization techniques have been applied, i.e. dielectric loading and distortion of the current path. We have added an extra degree of freedom to the latter. The radiator is integrated with the chassis of the picosatellite and, at the same time, operates at the lower end of the UHF spectrum. In terms of electrical size, the structure presented herein is one of the smallest antennas that have been proposed for small satellites. Despite its small electrical size, the antenna maintains acceptable efficiency and gain performance in the band of interest.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114339170","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: 35
Open-loop analysis of an error detector for blind symbol timing recovery using baud-rate samples 基于波特率采样的符号时序盲恢复错误检测器的开环分析
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656779
M. Flohberger, W. Gappmair, O. Koudelka
{"title":"Open-loop analysis of an error detector for blind symbol timing recovery using baud-rate samples","authors":"M. Flohberger, W. Gappmair, O. Koudelka","doi":"10.1109/IWSSC.2008.4656779","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656779","url":null,"abstract":"For symbol timing recovery with feedback loops, Mueller and Mueller (MM) detectors can be an attractive solution in comparison to other algorithms. This is mainly due to the fact that they are operated at baud rate, thus avoiding any performance degradation in form of the jitter floor as it is the case with zero-crossing or Gardner synchronizers as most prominent examples in this respect. However, in order to guarantee reliable results, MM trackers require the carrier phase to be established. Motivated by this background, a timing error detector for carrier-independent and non-data-aided (blind) synchronization of the symbol timing is analyzed and discussed, which needs only one sample per symbol. Assuming linearly modulated signals, the detector characteristic (S-curve) is computed exactly and verified by simulation results, with the slope in the stable equilibrium point given in closed form such that the tracking loop can be specified accordingly.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131930111","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: 6
Impact of aircraft boundary layer on laser beam propagation 飞机边界层对激光束传播的影响
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656811
F. Stathopoulos, P. Constantinou
{"title":"Impact of aircraft boundary layer on laser beam propagation","authors":"F. Stathopoulos, P. Constantinou","doi":"10.1109/IWSSC.2008.4656811","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656811","url":null,"abstract":"Creating an optical point-to-point link with an aircraft is a challenging issue. This link can be formed in various ways: (a) via a direct link between the earth base and the aircraft, (b) via a direct link between the two aircrafts or (c) via a satellite. Such a link can achieve: high propagation speed of the beam in long distances, high data rate and secure information transmission. The goal is the minimization of the beam wavefront distortion. In this work we study the flow field around an aircraft. The main contributions of our work are: (a) we derive the relation between air properties - e.g. density and pressure - and the refractive index, and then quantify the affect of the flow field on the laser beam, (b) we introduce a framework that can be applied in any flying object and any kind of flow, (c) using this framework we are able to describe and quantify the aberration of the wavefront. Via extensive simulations we examine the distortion of the wavefront with regards to various parameters. We believe that our findings can form the basis for better telecommunication results.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123674950","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: 2
Evaluation of fog attenuation results for optical wireless links in free space 自由空间光无线链路雾衰减结果的评价
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656761
M. S. Awan, E. Leitgeb, Marzuki, M. S. Khan, F. Nadeem, Carlo Capsoni
{"title":"Evaluation of fog attenuation results for optical wireless links in free space","authors":"M. S. Awan, E. Leitgeb, Marzuki, M. S. Khan, F. Nadeem, Carlo Capsoni","doi":"10.1109/IWSSC.2008.4656761","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656761","url":null,"abstract":"Fog presents the biggest challenge to propagation of optical signal in free space causing severe attenuations reaching up to several hundred of dB/km. In this paper, an overall fog attenuation behavior of the optical wireless links installed at Milan (Italy) and Graz (Austria) under moderate continental fog conditions, and Nice (France) under dense maritime fog environments is compared and evaluated based on the measured fog attenuations data. The attenuation data evaluated here of Graz and Milan consists of five and two winter months respectively, while for Nice it consists of eight summer days. It is shown that like any other meteorological effects, optical signal attenuations in different fog environments depends very much on the season, geographical location and on the time of the day. Based on the analysed data results for moderate fog environments, we infer that attenuations are particularly high during months of December, January and February, whereas, for dense maritime fog environments it depends additionally to some other meteorological parameters besides the geographical location and the time of the day. From this attenuation behavior analysis interesting results are obtained which can be helpful to understand the fog and its attenuations prediction behavior for optical signals transmitted in free space.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124490369","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: 12
Low-rate coding using incremental redundancy for GLDPC codes 使用增量冗余的GLDPC码的低速率编码
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656817
M. Cunche, V. Savin, V. Roca, G. Kraidy, A. Soro, J. Lacan
{"title":"Low-rate coding using incremental redundancy for GLDPC codes","authors":"M. Cunche, V. Savin, V. Roca, G. Kraidy, A. Soro, J. Lacan","doi":"10.1109/IWSSC.2008.4656817","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656817","url":null,"abstract":"In this paper we propose a low-rate coding method, suited for application-layer forward error correction. Depending on channel conditions, the coding scheme we propose can switch from a fixed-rate LDPC code to various low-rate GLDPC codes. The source symbols are first encoded by using a staircase or triangular LDPC code. If additional symbols are needed, the encoder is then switched to the GLDPC mode and extra-repair symbols are produced, on demand. In order to ensure small overheads, we consider irregular distributions of extra-repair symbols optimized by density evolution techniques. We also show that increasing the number of extra-repair symbols improves the successful decoding probability, which becomes very close to 1 for sufficiently many extra-repair symbols.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669835","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: 10
Bringing multimedia services to digital-divide end-users with smart 2-way satellite technologies: The UNIC EC FP6 project 通过智能双向卫星技术为数字鸿沟终端用户提供多媒体服务:UNIC EC FP6项目
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656772
G. Boccolini, M. Luise, B. Garnier, J.-M. Merour
{"title":"Bringing multimedia services to digital-divide end-users with smart 2-way satellite technologies: The UNIC EC FP6 project","authors":"G. Boccolini, M. Luise, B. Garnier, J.-M. Merour","doi":"10.1109/IWSSC.2008.4656772","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656772","url":null,"abstract":"Satellite-based telecom systems provide the best and quickest solution to reducing the digital divide in less-favored areas owing to their wide geographical coverage and the speed and ease of deployment of terminal equipment. However, satellite system must be efficient and cost effective, and capable of full inter-working with state-of-the-art terrestrial broadband networks. This paper presents a novel two-way broadband satellite architecture developed in the framework of the UNIC (UNIversal satellite home Connection) project, sponsored within the 6th EU Research Programme Framework. The UNIC system architecture provides TV-Centric triple play services to actual end-users in the home employing DVB-S2 and DVB-RCS technologies in the forward and the return link, respectively, together with a newly low-cost defined architecture for the distribution of connectivity to end-users, including an ad-hoc interactive Set-Top-Box.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"85 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123176904","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: 4
SATSIX cross-layer architecture SATSIX跨层架构
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656786
I. Melhus, T. Gayraud, F. Nivor, M. Gineste, F. Arnal, A. Pietrabissa, L. Fan
{"title":"SATSIX cross-layer architecture","authors":"I. Melhus, T. Gayraud, F. Nivor, M. Gineste, F. Arnal, A. Pietrabissa, L. Fan","doi":"10.1109/IWSSC.2008.4656786","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656786","url":null,"abstract":"Next-generation broadband satellite systems will have the capability to provide cost-effective universal broadband access for the users. But in order to meet userspsila requirements, many enhancements have to be made on the existing satellite technologies. One of the promising methods is the introduction of cross-layer design. There are several advantages of a layered approach, since modularity, robustness and ease of designs are easily achieved. However the properties of the different layers have substantial interdependencies and a modularized design may therefore be suboptimal with regards to performance and availability. In this paper, we will carry out a review of cross-layer design in general, and based on this a cross-layer architecture for the next-generation broadband satellite system is proposed. Two main components are identified in the proposed cross-layer architecture: QoS and resource management and mobility management.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122860692","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: 2
Channel-Aware Scheduling algorithms with Channel Prediction for reliable multicast data transmission over geostationary satellite networks 信道感知调度算法与信道预测在地球同步卫星网络上可靠的多播数据传输
2008 IEEE International Workshop on Satellite and Space Communications Pub Date : 2008-10-24 DOI: 10.1109/IWSSC.2008.4656754
A. Sali, G. Acar, B. Evans, G. Giambene
{"title":"Channel-Aware Scheduling algorithms with Channel Prediction for reliable multicast data transmission over geostationary satellite networks","authors":"A. Sali, G. Acar, B. Evans, G. Giambene","doi":"10.1109/IWSSC.2008.4656754","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656754","url":null,"abstract":"In this paper, real-time channel prediction (RTChP) technique is implemented with channel-aware scheduling algorithms to increase decision accuracy at the scheduler. The channel-aware scheduler receives feedback messages in the form of channel state information (CSI) from the terminals via reservation slots in the return link. In the face of reliable multicast transmission, the channel-aware scheduler aims to reduce the number of packets received in error at the terminals. As a consequence, additional retransmission passes can be decreased, resulting in higher resource utilization in the forward link and reduced session delay. Simulation results are presented with considerations of a channel-aware scheduling (CAS) algorithm. From simulation results, RTChP increases performance gain when a lower number of terminals are considered. However, when the scenario involves more terminals, the prediction technique is ineffective and its performance deteriorates. Essentially, the RTChP implemented at the scheduler is useful only for small multicast group.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131174415","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: 5
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