Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286366
E. Del Re, Renato Pucci, L. Ronga
The IEEE 802.15.4 standard (ZigBee) provides low cost and low power connectivity for Wireless Sensor Network (WSN) devices that need a monthly or years duration of battery, with low DataRate and small dimensions. All such features fit pretty well the requirements of a space mission and for this reason the spatial community is investigating the possibility of using WSN in planetary exploration context, in particular on Mars. After an accurate analysis of the past missions retrieved data, we individuate the most common propagation contexts on Mars and we evaluate the performance of an IEEE802.15.4 standard based sensor network working at 2.4GHz for that contexts. In order to evaluate the applicability of the IEEE 802.15.4 standard to planetary exploration context, a characterization of the most common five frequency channel is obtained taking into account all the Martian geomorphologic, atmospheric and eolian features. Considering such frequency channels, thanks to Simulink and OMNET++ simulation models, network performances like Bit Error Rate (BER), Symbol Error Rate (SER) and Throughput are obtained. The possibility to implement a packet level coding is also investigated.
{"title":"IEEE802.15.4 Wireless Sensor Network in Mars exploration scenario","authors":"E. Del Re, Renato Pucci, L. Ronga","doi":"10.1109/IWSSC.2009.5286366","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286366","url":null,"abstract":"The IEEE 802.15.4 standard (ZigBee) provides low cost and low power connectivity for Wireless Sensor Network (WSN) devices that need a monthly or years duration of battery, with low DataRate and small dimensions. All such features fit pretty well the requirements of a space mission and for this reason the spatial community is investigating the possibility of using WSN in planetary exploration context, in particular on Mars. After an accurate analysis of the past missions retrieved data, we individuate the most common propagation contexts on Mars and we evaluate the performance of an IEEE802.15.4 standard based sensor network working at 2.4GHz for that contexts. In order to evaluate the applicability of the IEEE 802.15.4 standard to planetary exploration context, a characterization of the most common five frequency channel is obtained taking into account all the Martian geomorphologic, atmospheric and eolian features. Considering such frequency channels, thanks to Simulink and OMNET++ simulation models, network performances like Bit Error Rate (BER), Symbol Error Rate (SER) and Throughput are obtained. The possibility to implement a packet level coding is also investigated.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130337460","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286372
B. Collini-Nocker
{"title":"PhD session 3 (room E) networking II","authors":"B. Collini-Nocker","doi":"10.1109/IWSSC.2009.5286372","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286372","url":null,"abstract":"","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128773703","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286417
F. Cercas, J. C. Silva, N. Souto, R. Dinis
Recent studies have determined the performance of TCH(n,k) (Tomlinson, Cercas, Hughes) codes in different environments, namely for mobile satellite channels for which TCH codes of small length n (e.g. 16) present some advantages when compared with TCH codes of higher length (e.g. 256). However, the correlation characteristics of TCH codes of small length present some peaks that deteriorate its performance. In this paper we present a method to properly bit-map the incoming data bits to the code words so as to minimize this effect. The improvement in performance was obtained by simulation and is compared with previous known results.
{"title":"Optimum bit-mapping of TCH codes","authors":"F. Cercas, J. C. Silva, N. Souto, R. Dinis","doi":"10.1109/IWSSC.2009.5286417","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286417","url":null,"abstract":"Recent studies have determined the performance of TCH(n,k) (Tomlinson, Cercas, Hughes) codes in different environments, namely for mobile satellite channels for which TCH codes of small length n (e.g. 16) present some advantages when compared with TCH codes of higher length (e.g. 256). However, the correlation characteristics of TCH codes of small length present some peaks that deteriorate its performance. In this paper we present a method to properly bit-map the incoming data bits to the code words so as to minimize this effect. The improvement in performance was obtained by simulation and is compared with previous known results.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133778991","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286400
P. Tosovsky
Software Defined Radio concept brought high degree of flexibility to radio communication links. The main idea of the concept is to carry most of signal processing to the digital domain where the processing can be driven by software. The same approach can be used for Software Defined Array Antenna. Every Antenna element of the array is equipped by analog-todigital conversion unit which samples a received signal. The Antenna element is constructed as a dual polarization unit; both polarization planes are sampled separately to the I/Q plane vector representation. The data are collected via digital bus by a central unit where the data are processed by adaptive beamforming and demodulation algorithm to maximize quality of desired signal. This architecture has several advantages; interconnection bus is purely digital (easier wiring design), mutual RF coupling between the Antenna units (typically via reference oscillator wiring) is effectively suppressed and the Antenna array is fully deployable without any extra effort. In connection with both polarization planes sampling, we obtain the receiver which is capable to receive signal with any polarization (include elliptical), placed to random part of spectrum within processed bandwidth and modulated by arbitrary type of modulation with maximum signal to noise ratio.
{"title":"Software Defined Phased Array Antenna architecture and design approach","authors":"P. Tosovsky","doi":"10.1109/IWSSC.2009.5286400","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286400","url":null,"abstract":"Software Defined Radio concept brought high degree of flexibility to radio communication links. The main idea of the concept is to carry most of signal processing to the digital domain where the processing can be driven by software. The same approach can be used for Software Defined Array Antenna. Every Antenna element of the array is equipped by analog-todigital conversion unit which samples a received signal. The Antenna element is constructed as a dual polarization unit; both polarization planes are sampled separately to the I/Q plane vector representation. The data are collected via digital bus by a central unit where the data are processed by adaptive beamforming and demodulation algorithm to maximize quality of desired signal. This architecture has several advantages; interconnection bus is purely digital (easier wiring design), mutual RF coupling between the Antenna units (typically via reference oscillator wiring) is effectively suppressed and the Antenna array is fully deployable without any extra effort. In connection with both polarization planes sampling, we obtain the receiver which is capable to receive signal with any polarization (include elliptical), placed to random part of spectrum within processed bandwidth and modulated by arbitrary type of modulation with maximum signal to noise ratio.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131737681","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286359
P. Brandl, T. Plank, E. Leitgeb
The use of optical communication links is a growing and promising technology, with applications spreading over many areas of telecommunication. This paper will present the results of an investigation on interplanetary communication requirements for future space mission which was done under an ESA contract and SatNEx II. From the user point of view, the technology behind the data transmission is irrelevant. However, when applying optical wireless links, high data rates could be realized with less effort compared to RF links. It should be clarified how optical communication links can provide well working solutions for a growing demand on data rates. Moreover, some first system designs with corresponding link budget calculations were performed.
{"title":"Optical wireless links in future space communications with high data rate demands","authors":"P. Brandl, T. Plank, E. Leitgeb","doi":"10.1109/IWSSC.2009.5286359","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286359","url":null,"abstract":"The use of optical communication links is a growing and promising technology, with applications spreading over many areas of telecommunication. This paper will present the results of an investigation on interplanetary communication requirements for future space mission which was done under an ESA contract and SatNEx II. From the user point of view, the technology behind the data transmission is irrelevant. However, when applying optical wireless links, high data rates could be realized with less effort compared to RF links. It should be clarified how optical communication links can provide well working solutions for a growing demand on data rates. Moreover, some first system designs with corresponding link budget calculations were performed.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132001923","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286398
Yongxiong Ren, A. Dang, Hong Guo
This paper investigates the performance of high-rate block codes in log-normal fading atmospheric channel based on the discussion of channel characteristics. Several block codes are under study, especially two kinds of iterative decoding codes with high code rate and low encoder/decoder complexity: Hamming-based TPC codes and block circulant based LDPC codes. The code types selection and iterative decoding algorithms for the two codes are discussed. The performance of several codes under different turbulence strength are also reported. Both TPC and LDPC codes can achieve impressive coding gain based on theoretical analysis and extensive computer simulation. In term of superior property in coding gain, error floor effect and hardware implementation, we recommend TPCs as FEC scheme for FSO system.
{"title":"Iterative decodable block codes for high-speed free space optical communication","authors":"Yongxiong Ren, A. Dang, Hong Guo","doi":"10.1109/IWSSC.2009.5286398","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286398","url":null,"abstract":"This paper investigates the performance of high-rate block codes in log-normal fading atmospheric channel based on the discussion of channel characteristics. Several block codes are under study, especially two kinds of iterative decoding codes with high code rate and low encoder/decoder complexity: Hamming-based TPC codes and block circulant based LDPC codes. The code types selection and iterative decoding algorithms for the two codes are discussed. The performance of several codes under different turbulence strength are also reported. Both TPC and LDPC codes can achieve impressive coding gain based on theoretical analysis and extensive computer simulation. In term of superior property in coding gain, error floor effect and hardware implementation, we recommend TPCs as FEC scheme for FSO system.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128438824","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286418
J. Seseña
{"title":"Special session 2 (room E) ISICOM: the research challenges for the European SatCom","authors":"J. Seseña","doi":"10.1109/IWSSC.2009.5286418","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286418","url":null,"abstract":"","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123896371","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286411
P. Pillai, H. Cruickshank
{"title":"Special session 3 (room 18) security","authors":"P. Pillai, H. Cruickshank","doi":"10.1109/IWSSC.2009.5286411","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286411","url":null,"abstract":"","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128777566","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286360
P. Romano, P. Schrotter, O. Koudelka, M. Wittig
A major effort in current developments for future space missions is the improvement of communications capabilities. With increasing interest in space research and long-term exploration programs including a variety of both near Earth and deep space missions of the major space agencies, communications faces additional challenges. Next-generation communication systems must be able to cope with long-distance communication links, supporting disruption-tolerant networking (DTN), implementing efficient store-and-forward strategies for data download, and providing interoperability between missions. Therefore, innovative concepts for the creation of an Interplanetary Internet (IPN) are currently under investigation. The Interplanetary Internet Special Interest Group (IPNSIG) has already elaborated a suitable IPN network architecture and identified key research areas. Since the main challenges for IPN are efficient data transport strategies, current research activities are focused on the transport layer. However, in order to achieve these goals, improvements at all OSI layers are necessary. The presented paper deals with future developments required for the establishment of an Interplanetary Internet. After introducing an IPN network architecture proposed by [1], the suitability of terrestrial Internet and existing space communications standards for IPN is analyzed. Current protocol developments for IPN are introduced and compared with the previously investigated standards. Finally, future IPN developments are presented. This analysis focuses on all OSI layers, providing a set of recommendations for the improvement of existing technologies and proposing some innovative concepts and solutions.
{"title":"Developments towards an Interplanetary Internet","authors":"P. Romano, P. Schrotter, O. Koudelka, M. Wittig","doi":"10.1109/IWSSC.2009.5286360","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286360","url":null,"abstract":"A major effort in current developments for future space missions is the improvement of communications capabilities. With increasing interest in space research and long-term exploration programs including a variety of both near Earth and deep space missions of the major space agencies, communications faces additional challenges. Next-generation communication systems must be able to cope with long-distance communication links, supporting disruption-tolerant networking (DTN), implementing efficient store-and-forward strategies for data download, and providing interoperability between missions. Therefore, innovative concepts for the creation of an Interplanetary Internet (IPN) are currently under investigation. The Interplanetary Internet Special Interest Group (IPNSIG) has already elaborated a suitable IPN network architecture and identified key research areas. Since the main challenges for IPN are efficient data transport strategies, current research activities are focused on the transport layer. However, in order to achieve these goals, improvements at all OSI layers are necessary. The presented paper deals with future developments required for the establishment of an Interplanetary Internet. After introducing an IPN network architecture proposed by [1], the suitability of terrestrial Internet and existing space communications standards for IPN is analyzed. Current protocol developments for IPN are introduced and compared with the previously investigated standards. Finally, future IPN developments are presented. This analysis focuses on all OSI layers, providing a set of recommendations for the improvement of existing technologies and proposing some innovative concepts and solutions.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123196524","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}
Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286320
F. Belli, M. Luglio, C. Roseti, F. Zampognaro
This paper analyses performance of competing TCP connections when running over different Return Channel Satellite Terminals (RCSTs) and competing for DVB-RCS return link bandwidth through DAMA mechanisms. A test campaign has been performed over a Linux-based satellite emulator supporting a multi-RCST configuration in a star-based architecture, with the main goal to evaluate TCP behavior in terms of both capacity utilization and fairness. In the proposed communication scenario, TCP performance relates on the joint effect of two nested control loops: TCP congestion/rate control loop and DAMA bandwidth assignment loop. Various TCP versions have been taken into account: Reno, Vegas, Westwood+, Hybla, Cubic and Noordwijk, a new TCP specifically designed for DVB-RCS point-to-point links. Rate Based Capacity Request (RBDC) has been selected as the access protocol.
本文通过DAMA机制分析了运行在不同返回信道卫星终端(rcst)上竞争TCP连接以及竞争DVB-RCS返回链路带宽时的性能。在一个基于linux的卫星模拟器上执行了一个测试活动，该模拟器支持基于星型架构中的多rcst配置，其主要目标是根据容量利用率和公平性来评估TCP行为。在提出的通信场景中，TCP性能与两个嵌套控制环的共同作用有关:TCP拥塞/速率控制环和DAMA带宽分配环。考虑到各种TCP版本:Reno, Vegas, Westwood+， Hybla, Cubic和Noordwijk，一种专门为DVB-RCS点对点链路设计的新TCP。已选择RBDC (Rate Based Capacity Request)作为接入协议。
{"title":"Evaluation of TCP performance over emulated DVB-RCS scenario with multiple RCSTs","authors":"F. Belli, M. Luglio, C. Roseti, F. Zampognaro","doi":"10.1109/IWSSC.2009.5286320","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286320","url":null,"abstract":"This paper analyses performance of competing TCP connections when running over different Return Channel Satellite Terminals (RCSTs) and competing for DVB-RCS return link bandwidth through DAMA mechanisms. A test campaign has been performed over a Linux-based satellite emulator supporting a multi-RCST configuration in a star-based architecture, with the main goal to evaluate TCP behavior in terms of both capacity utilization and fairness. In the proposed communication scenario, TCP performance relates on the joint effect of two nested control loops: TCP congestion/rate control loop and DAMA bandwidth assignment loop. Various TCP versions have been taken into account: Reno, Vegas, Westwood+, Hybla, Cubic and Noordwijk, a new TCP specifically designed for DVB-RCS point-to-point links. Rate Based Capacity Request (RBDC) has been selected as the access protocol.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115321829","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}
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