Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333101
A. Kyrgiazos, B. Evans, P. Thompson, N. Jeannin
Future internet demands are being increased dramatically year by year. Terrestrial systems are unable to satisfy these demands in all geographical areas and thus broadband access by satellite is a key service provision platform. Considering the traffic demands, the raw capacity should approach a Terabit/s by 2020 to meet these demands. So the challenge is to reduce the cost/bit and to increase the satellite capacity from today's 10 Gbps to 1 Tbps by 2020. In order to find the available spectrum, the migration to higher bands such as Ka-band, Q/V bands is considered a neccessity. But migrating to these higher bands in order to have access to more available spectrum, we experience severe precipitation attenuation, and the feeder links that carry much more capacity are more vulnerable to these high attenuations. ACM is unable to cope with the precipitation fades in these higher bands, and single site diversity results in an excessive number of extra earth stations which is not cost effective. It is envisaged that future systems may interconnect gateways to allow traffic routing between them, a so called `Smart Gateway diversity scheme'. This scheme is discussed and potential architectures are proposed. We evaluate the performance of such schemes in terms of their availability.
{"title":"Gateway diversity scheme for a future broadband satellite system","authors":"A. Kyrgiazos, B. Evans, P. Thompson, N. Jeannin","doi":"10.1109/ASMS-SPSC.2012.6333101","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333101","url":null,"abstract":"Future internet demands are being increased dramatically year by year. Terrestrial systems are unable to satisfy these demands in all geographical areas and thus broadband access by satellite is a key service provision platform. Considering the traffic demands, the raw capacity should approach a Terabit/s by 2020 to meet these demands. So the challenge is to reduce the cost/bit and to increase the satellite capacity from today's 10 Gbps to 1 Tbps by 2020. In order to find the available spectrum, the migration to higher bands such as Ka-band, Q/V bands is considered a neccessity. But migrating to these higher bands in order to have access to more available spectrum, we experience severe precipitation attenuation, and the feeder links that carry much more capacity are more vulnerable to these high attenuations. ACM is unable to cope with the precipitation fades in these higher bands, and single site diversity results in an excessive number of extra earth stations which is not cost effective. It is envisaged that future systems may interconnect gateways to allow traffic routing between them, a so called `Smart Gateway diversity scheme'. This scheme is discussed and potential architectures are proposed. We evaluate the performance of such schemes in terms of their availability.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"8 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":"132617968","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333093
M. Crosnier, R. Dhaou, F. Planchou, A. Beylot
Mobile Ad-hoc Network, associated with satellite connectivity, is a promising solution to provide communication for safety professionals where the standard terrestrial network is not available. Since satellite links are throughput and delay constrained, load distribution is a key mechanism in order to meet safety requirements. As a consequence, this paper presents a load balancing mechanism which distributes traffics among different satellite gateways of a mobile ad-hoc network. The principle is based on the OLSR routing protocol and relies on the correspondence between satellite gateway load and the size of the cluster served by this gateway. The specificity of the proposed mechanism is to tailor the load balancing procedure to the satellite parameters. Besides, the principle is very simple and the complexity lies in the additional mechanisms that limit untoward aftermath of load balancing with inappropriate scenarios.
{"title":"A cluster-based load balancing between satellite gateways in a MANET","authors":"M. Crosnier, R. Dhaou, F. Planchou, A. Beylot","doi":"10.1109/ASMS-SPSC.2012.6333093","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333093","url":null,"abstract":"Mobile Ad-hoc Network, associated with satellite connectivity, is a promising solution to provide communication for safety professionals where the standard terrestrial network is not available. Since satellite links are throughput and delay constrained, load distribution is a key mechanism in order to meet safety requirements. As a consequence, this paper presents a load balancing mechanism which distributes traffics among different satellite gateways of a mobile ad-hoc network. The principle is based on the OLSR routing protocol and relies on the correspondence between satellite gateway load and the size of the cluster served by this gateway. The specificity of the proposed mechanism is to tailor the load balancing procedure to the satellite parameters. Besides, the principle is very simple and the complexity lies in the additional mechanisms that limit untoward aftermath of load balancing with inappropriate scenarios.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"35 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":"127467563","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 : 2012-09-07DOI: 10.1109/ASMS-SPSC.2012.6333104
G. Liva, E. Paolini, Tomaso de Cola, M. Chiani
Recently, short binary and non-binary iteratively-decodable codes have been proposed within the Next Generation Uplink (NGU) working group (WG) of the Consultative Committee for Space Data Systems (CCSDS). The NGU WG targets the design of an enhanced uplink mainly for telecommand with the aim of updating the current uplink standard that employs a short (63, 56) BCH code to protect the telecommand messages. The proposed non-binary turbo/LDPC codes attain large coding gains over the standardized BCH codes, but also over their binary turbo/LDPC counterparts (up to 1.5 dB of coding gain for information blocks of 64 bits). This paper overviews the proposed non-binary code construction, illustrating the potential of non-binary turbo/LDPC codes in the short block length regime. The impact of the proposed solution at system level is investigated, together with its integration in the CCSDS protocol stack.
{"title":"Codes on high-order fields for the CCSDS next generation uplink","authors":"G. Liva, E. Paolini, Tomaso de Cola, M. Chiani","doi":"10.1109/ASMS-SPSC.2012.6333104","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333104","url":null,"abstract":"Recently, short binary and non-binary iteratively-decodable codes have been proposed within the Next Generation Uplink (NGU) working group (WG) of the Consultative Committee for Space Data Systems (CCSDS). The NGU WG targets the design of an enhanced uplink mainly for telecommand with the aim of updating the current uplink standard that employs a short (63, 56) BCH code to protect the telecommand messages. The proposed non-binary turbo/LDPC codes attain large coding gains over the standardized BCH codes, but also over their binary turbo/LDPC counterparts (up to 1.5 dB of coding gain for information blocks of 64 bits). This paper overviews the proposed non-binary code construction, illustrating the potential of non-binary turbo/LDPC codes in the short block length regime. The impact of the proposed solution at system level is investigated, together with its integration in the CCSDS protocol stack.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115663345","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 : 1900-01-01DOI: 10.1109/ASMS-SPSC.2012.6333097
A. Ijaz, A. Awoseyila, B. Evans
The current DVB-S2 standard specifies the use of constant energy level pilots for receiver synchronization and equalization algorithms. However, these are unsuitable for APSK modulations due to the nonlinear response of the satellite power amplifier. In this paper, we investigate the performance of two low-complexity techniques for nonlinear compensation in DVB-S2 systems, i.e. static predistortion and cluster based sequence equalizer (CBSE). We also propose how multilevel pilot structures, matched to each technique, can be used for carrier recovery. Simulation results are presented in terms of total degradation wherein both techniques are shown to achieve a significant improvement over the conventional system.
{"title":"Carrier recovery and nonlinear compensation for DVB-S2 using multilevel pilots","authors":"A. Ijaz, A. Awoseyila, B. Evans","doi":"10.1109/ASMS-SPSC.2012.6333097","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333097","url":null,"abstract":"The current DVB-S2 standard specifies the use of constant energy level pilots for receiver synchronization and equalization algorithms. However, these are unsuitable for APSK modulations due to the nonlinear response of the satellite power amplifier. In this paper, we investigate the performance of two low-complexity techniques for nonlinear compensation in DVB-S2 systems, i.e. static predistortion and cluster based sequence equalizer (CBSE). We also propose how multilevel pilot structures, matched to each technique, can be used for carrier recovery. Simulation results are presented in terms of total degradation wherein both techniques are shown to achieve a significant improvement over the conventional system.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129328034","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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