Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286305
L. Caviglione
Satellite communication is one of the key technologies for the future Internet development, which nowadays is experiencing a new trend in its usage, especially in the field of Web. However the joint utilization of satellites and “trendy” solutions, e.g., Web 2.0 and Software as a Service (SaaS), poses some issues. In this perspective, the contribution of this work is twofold: i) to analyze and introduce new usage patterns imposed by the Web 2.0 phenomena and ii) to study the impact of satellite links in such environments. In addition, an analysis of the main behaviors (both of web browsers and traffic) in the scenario where satellites and Web 2.0 applications are mixed is also provided.
{"title":"Can satellites face trends? The case of Web 2.0","authors":"L. Caviglione","doi":"10.1109/IWSSC.2009.5286305","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286305","url":null,"abstract":"Satellite communication is one of the key technologies for the future Internet development, which nowadays is experiencing a new trend in its usage, especially in the field of Web. However the joint utilization of satellites and “trendy” solutions, e.g., Web 2.0 and Software as a Service (SaaS), poses some issues. In this perspective, the contribution of this work is twofold: i) to analyze and introduce new usage patterns imposed by the Web 2.0 phenomena and ii) to study the impact of satellite links in such environments. In addition, an analysis of the main behaviors (both of web browsers and traffic) in the scenario where satellites and Web 2.0 applications are mixed is also provided.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"107 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":"125051527","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.2009.5286400
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.2009.5286366
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.2009.5286359
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.2009.5286417
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.2009.5286360
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.2009.5286401
M. Noisternig, B. Collini-Nocker, P. Pillai, L. Liang, H. Cruickshank
The Unidirectional Lightweight Encapsulation (ULE) protocol has been defined for efficient transport of IPv4/6 and other protocols over the MPEG-2 Transport Stream (TS). The proliferation of this technology on the mass market may benefit from a security solution protecting against potential threats such as eavesdropping, as well as masquerading, modification of messages, and replay attacks, similar to 802.11 security. A unified ULE security extension header format has been proposed previously by the authors. This paper discusses in detail the processing required for transmitters and receivers supporting this security extension for ULE.
{"title":"Transmitter and receiver processing specification for a unified ULE security extension","authors":"M. Noisternig, B. Collini-Nocker, P. Pillai, L. Liang, H. Cruickshank","doi":"10.1109/IWSSC.2009.5286401","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286401","url":null,"abstract":"The Unidirectional Lightweight Encapsulation (ULE) protocol has been defined for efficient transport of IPv4/6 and other protocols over the MPEG-2 Transport Stream (TS). The proliferation of this technology on the mass market may benefit from a security solution protecting against potential threats such as eavesdropping, as well as masquerading, modification of messages, and replay attacks, similar to 802.11 security. A unified ULE security extension header format has been proposed previously by the authors. This paper discusses in detail the processing required for transmitters and receivers supporting this security extension for ULE.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"32 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":"124921620","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.2009.5286328
D. Skraparlis, V. Sakarellos, A. Panagopoulos, J. Kanellopoulos
A diversity reception scheme using satellite and terrestrial links is an effective technique to reduce the large fading margins in satellite communications operating under fading conditions. The increased demand for bandwidth has led to the employment of frequencies above 10 GHz, where the dominant fading mechanism is rain attenuation. Signal attenuation is aggravated in heavy rain climatic regions. As it has been experimentally verified, the long-term behaviour of rain attenuation induced on a microwave path in tropical regions is approximated by a gamma distribution. In this paper, the outage performance analysis of a satellite-terrestrial diversity reception system operating at frequencies above 10 GHz is presented, employing spatially correlated gamma fading channels. The receiver combines the satellite signal with the signal received by a terrestrial network using either the Maximal Ratio Combining or the Selection Combining techniques. Extended numerical results present the impact of various operational, geometrical and geographical parameters on the outage system performance.
{"title":"Satellite and terrestrial diversity reception performance in tropical regions","authors":"D. Skraparlis, V. Sakarellos, A. Panagopoulos, J. Kanellopoulos","doi":"10.1109/IWSSC.2009.5286328","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286328","url":null,"abstract":"A diversity reception scheme using satellite and terrestrial links is an effective technique to reduce the large fading margins in satellite communications operating under fading conditions. The increased demand for bandwidth has led to the employment of frequencies above 10 GHz, where the dominant fading mechanism is rain attenuation. Signal attenuation is aggravated in heavy rain climatic regions. As it has been experimentally verified, the long-term behaviour of rain attenuation induced on a microwave path in tropical regions is approximated by a gamma distribution. In this paper, the outage performance analysis of a satellite-terrestrial diversity reception system operating at frequencies above 10 GHz is presented, employing spatially correlated gamma fading channels. The receiver combines the satellite signal with the signal received by a terrestrial network using either the Maximal Ratio Combining or the Selection Combining techniques. Extended numerical results present the impact of various operational, geometrical and geographical parameters on the outage system performance.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"34 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":"127139164","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.2009.5286321
R. Boreli, T. Iyer, Christoph Dwertmann, Golam Sarwar, F. Klok
We describe the research outcomes and resulting implementation and validation of a prototype IP telephony and data acceleration system for satellite communications. The system has been designed as a quickly deployable solution for generic use with fixed or mobile satellite services on land or sea. It has been developed in NICTA within the Office in a Box project and is currently being commercialised in 7-ip. Our main research contribution is a TCP proxy for long delay links, based on a novel congestion control and scheduling algorithm which incorporates lossless data compression. Additional contribution is in proposing and developing a silence suppression enhancement to the Asterisk IP telephony gateway. We describe the system and software architecture and software modules which include the satellite modem controller for the management of Inmarsat broadband satellite services. The system has been tested on a number of satellite services including Inmarsat BGAN, IPSTAR and VSAT systems. We present results of validation testing for multi-user IP telephony and data services and show performance improvement compared to standard solutions.
我们描述了一个用于卫星通信的原型IP电话和数据加速系统的研究成果和最终实现和验证。该系统被设计为一种快速部署的解决方案，用于陆地或海上的固定或移动卫星服务。它已经在NICTA的Office in a Box项目中开发，目前正在7-ip中商业化。我们的主要研究贡献是基于一种新的拥塞控制和调度算法的长延迟链路TCP代理，该算法包含无损数据压缩。另外的贡献是在建议和开发沉默抑制增强Asterisk IP电话网关。介绍了该系统的软件架构和软件模块，其中包括用于管理Inmarsat宽带卫星业务的卫星调制解调器控制器。该系统已在若干卫星业务上进行了测试，包括Inmarsat BGAN、IPSTAR和VSAT系统。我们展示了多用户IP电话和数据服务的验证测试结果，并显示了与标准解决方案相比性能的改进。
{"title":"A quickly deployable platform for multi-user communications over satellite links","authors":"R. Boreli, T. Iyer, Christoph Dwertmann, Golam Sarwar, F. Klok","doi":"10.1109/IWSSC.2009.5286321","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286321","url":null,"abstract":"We describe the research outcomes and resulting implementation and validation of a prototype IP telephony and data acceleration system for satellite communications. The system has been designed as a quickly deployable solution for generic use with fixed or mobile satellite services on land or sea. It has been developed in NICTA within the Office in a Box project and is currently being commercialised in 7-ip. Our main research contribution is a TCP proxy for long delay links, based on a novel congestion control and scheduling algorithm which incorporates lossless data compression. Additional contribution is in proposing and developing a silence suppression enhancement to the Asterisk IP telephony gateway. We describe the system and software architecture and software modules which include the satellite modem controller for the management of Inmarsat broadband satellite services. The system has been tested on a number of satellite services including Inmarsat BGAN, IPSTAR and VSAT systems. We present results of validation testing for multi-user IP telephony and data services and show performance improvement compared to standard solutions.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"4 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":"126972566","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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