Pub Date : 2007-12-26DOI: 10.1109/IWSSC.2007.4409396
M. Flohberger, W. Gappmair, O. Koudelka
Raised cosines represent more or less the de facto standard for baseband shaping in satellite communications. However, any pulse function satisfying the first Nyquist criterion could be used for this purpose. As reported in a recent paper, some of them exhibit considerably less self-noise jitter than raised cosines if they are employed for non-data-aided recovery of the symbol timing with Gardner detectors. With an extended version of the latter, it is shown analytically and by simulation results that the self-noise floor can be decreased significantly in the medium-to-low range of the excess bandwidth, if the corresponding synchronizer is applied to M-PSK signals shaped by a linear instead of a raised cosine pulse function.
{"title":"Improved Self-noise Performance of Gardner Synchronizers for Bandwidth-efficient M-PSK Signals","authors":"M. Flohberger, W. Gappmair, O. Koudelka","doi":"10.1109/IWSSC.2007.4409396","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409396","url":null,"abstract":"Raised cosines represent more or less the de facto standard for baseband shaping in satellite communications. However, any pulse function satisfying the first Nyquist criterion could be used for this purpose. As reported in a recent paper, some of them exhibit considerably less self-noise jitter than raised cosines if they are employed for non-data-aided recovery of the symbol timing with Gardner detectors. With an extended version of the latter, it is shown analytically and by simulation results that the self-noise floor can be decreased significantly in the medium-to-low range of the excess bandwidth, if the corresponding synchronizer is applied to M-PSK signals shaped by a linear instead of a raised cosine pulse function.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"134 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":"127482436","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409418
Yong-Min Lee, Jin-Ho Jo, S. Lee
After the development of transponder equipment as flight model, a series of evaluation processes are performed to verify and identify them on system level if any of the performance parameters are degraded or changed. The results of these evaluations are a valuable data base during the test of the payload on the ground and for future anomaly investigations in orbit. This paper describes the verification activities required to evaluate the RF performances of transponder equipment itself and Ka-band on-board switching transponder subsystem for COMS. ETRI completed the design effort and has finished the development of transponder equipment according to the communications payload development milestone and the Ka-band on-board switching transponder is being assembled and under testing the initial RF performances so far. A brief outline of the project work, the design of the Ka-band communications payloads, and functional capability including three channels of on-board switching transponders and two multi-beam antennas configuration will be also addressed.
{"title":"Verification of RF Performances of Ka-Band On-board Switching Transponder for COMS","authors":"Yong-Min Lee, Jin-Ho Jo, S. Lee","doi":"10.1109/IWSSC.2007.4409418","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409418","url":null,"abstract":"After the development of transponder equipment as flight model, a series of evaluation processes are performed to verify and identify them on system level if any of the performance parameters are degraded or changed. The results of these evaluations are a valuable data base during the test of the payload on the ground and for future anomaly investigations in orbit. This paper describes the verification activities required to evaluate the RF performances of transponder equipment itself and Ka-band on-board switching transponder subsystem for COMS. ETRI completed the design effort and has finished the development of transponder equipment according to the communications payload development milestone and the Ka-band on-board switching transponder is being assembled and under testing the initial RF performances so far. A brief outline of the project work, the design of the Ka-band communications payloads, and functional capability including three channels of on-board switching transponders and two multi-beam antennas configuration will be also addressed.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"181 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":"125351624","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409382
W.W. Wu, M.U. Wu
Digital satellite network is modeled by a set of discrete memoryless channels (DMCs), which reduce to three simple cascade binary symmetric channels (BSCs) for information transmission. The results of channel improvement due to specific error correction are asymptotically or numerically demonstrated in terms of channel capacity, transmission efficiency, message delay, bandwidth conservation and ease message traffic congestion.
{"title":"Simple Digital Satellite Channel Modeling with Bandwidth, Capacity and Efficiency Evaluations","authors":"W.W. Wu, M.U. Wu","doi":"10.1109/IWSSC.2007.4409382","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409382","url":null,"abstract":"Digital satellite network is modeled by a set of discrete memoryless channels (DMCs), which reduce to three simple cascade binary symmetric channels (BSCs) for information transmission. The results of channel improvement due to specific error correction are asymptotically or numerically demonstrated in terms of channel capacity, transmission efficiency, message delay, bandwidth conservation and ease message traffic congestion.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"10 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":"124345090","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/IWSSC.2007.4409405
A. Sali, G. Acar, B. Evans, G. Giambene
In this paper, we propose a feedback implosion suppression (FIS) algorithm that reduces the volume of feedback traffic from receivers in a multicast group over a geostationary satellite network. The system considered in this paper includes a reliable multicast transport protocol that operates on top of a channel-aware scheduler (CAS) with receivers capable of measuring and feeding back to the scheduler their channel state information (CSI). The collected CSI becomes a valuable input to avoid unfavorable channel conditions to reduce the forward link resources that would be wasted to retransmit lost segments. Using a fixed number of available uplink slots, the Radio Network Controller (RNC) decides which receivers to update their feedback messages in the next collection period based on their CSI in the current cycle. The integration of FIS and CAS modules achieves a degree of full reliability in multicast transmission over a satellite network without relying on any collaboration between receivers, or on any infrastructure other than the satellite network.
{"title":"Feedback Implosion Suppression Algorithm for Reliable Multicast Data Transmission over Geostationary Satellite Networks","authors":"A. Sali, G. Acar, B. Evans, G. Giambene","doi":"10.1109/IWSSC.2007.4409405","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409405","url":null,"abstract":"In this paper, we propose a feedback implosion suppression (FIS) algorithm that reduces the volume of feedback traffic from receivers in a multicast group over a geostationary satellite network. The system considered in this paper includes a reliable multicast transport protocol that operates on top of a channel-aware scheduler (CAS) with receivers capable of measuring and feeding back to the scheduler their channel state information (CSI). The collected CSI becomes a valuable input to avoid unfavorable channel conditions to reduce the forward link resources that would be wasted to retransmit lost segments. Using a fixed number of available uplink slots, the Radio Network Controller (RNC) decides which receivers to update their feedback messages in the next collection period based on their CSI in the current cycle. The integration of FIS and CAS modules achieves a degree of full reliability in multicast transmission over a satellite network without relying on any collaboration between receivers, or on any infrastructure other than the satellite network.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"13 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":"123764612","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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