Pub Date : 2007-12-26DOI: 10.1109/IWSSC.2007.4409428
A. Iuoras, C. Morlet
In this paper we address the emerging application of mobility to DVB-RCS/S2 systems, alternatively referred to as Satellite-On-The-Move (SOTM) communications. Broadband mobile communications represent an additional market for the satellites, of interest primarily to transport operators (of planes, ships, trains) but also to end-users in cars. To ensure economy of scale and fast development and deployment of mobile equipments, the adaptation of current satellite broadcast and interactive broadband standards is foreseen. This paper presents issues and techniques dealing with network and mobility management for DVB-RCS/S2 systems. It is shown that synchronization can be ensured by using proper methods even when spectrum spreading techniques are used and that seamless beam handovers can be achieved.
{"title":"Network and Mobility Management for Mobile DVB-S2/DVB-RCS systems","authors":"A. Iuoras, C. Morlet","doi":"10.1109/IWSSC.2007.4409428","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409428","url":null,"abstract":"In this paper we address the emerging application of mobility to DVB-RCS/S2 systems, alternatively referred to as Satellite-On-The-Move (SOTM) communications. Broadband mobile communications represent an additional market for the satellites, of interest primarily to transport operators (of planes, ships, trains) but also to end-users in cars. To ensure economy of scale and fast development and deployment of mobile equipments, the adaptation of current satellite broadcast and interactive broadband standards is foreseen. This paper presents issues and techniques dealing with network and mobility management for DVB-RCS/S2 systems. It is shown that synchronization can be ensured by using proper methods even when spectrum spreading techniques are used and that seamless beam handovers can be achieved.","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":"132808176","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.2007.4409432
D. Giustiniano, F. Lo Piccolo, N. B. Melazzi
In the recent years, there has been an increasing need to capture positioning informations, basically based on GPS systems. The informations retrieved by these satellite systems may be not always available in specific scenarios like indoor areas, tree-covered zones or urban canyons. On the other hand, thanks to the technical advances in wireless networking, low cost 802.11 Wi-Fi networks can be exploited to positioning un-located Wi-Fi terminals by exploiting the presence of located Wi-Fi terminals - GPS based - and the communication capabilities of all the Wi-Fi terminals. In this contribution we will duly define this scenario, and the related directions of work, with a particular focus on location-oriented 802.11 measurement methodologies.
{"title":"Relative localization in 802.11/GPS systems","authors":"D. Giustiniano, F. Lo Piccolo, N. B. Melazzi","doi":"10.1109/IWSSC.2007.4409432","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409432","url":null,"abstract":"In the recent years, there has been an increasing need to capture positioning informations, basically based on GPS systems. The informations retrieved by these satellite systems may be not always available in specific scenarios like indoor areas, tree-covered zones or urban canyons. On the other hand, thanks to the technical advances in wireless networking, low cost 802.11 Wi-Fi networks can be exploited to positioning un-located Wi-Fi terminals by exploiting the presence of located Wi-Fi terminals - GPS based - and the communication capabilities of all the Wi-Fi terminals. In this contribution we will duly define this scenario, and the related directions of work, with a particular focus on location-oriented 802.11 measurement methodologies.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"55 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":"126973435","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.2007.4409384
L. Csurgai-Horváth, J. Bitó
This paper introduces a method to model the rapid attenuation fluctuations (the scintillation) on satellite links with generating the time series of attenuation levels. The applied model is a hidden Markov model which is parameterized from an appropriate filtered Gaussian white noise signal. For the parameterization of the Markov chain the Baum-Welch expectation-maximization algorithm has been used. The resulting Markov model is applicable to generate scintillation time series for any desired duration with the time and amplitude resolution of the original training data. From the synthesized time series the statistical properties like the cumulative distribution and the dynamics of the scintillation can be also determined. To prove the accuracy of the model at first the cumulative distribution function of the original and synthesized time series are compared. A further test of the model validity is the comparison with real scintillation measurement on a land mobile satellite link. Finally, the spectral test of the filtered Gaussian model, the hidden Markov model and the satellite link measurement shows that the constant and decreasing parts in the periodograms are showing similarities what confirms the good quality of the model.
{"title":"Scintillation Time Series Synthesis for Satellite Links with Hidden Markov Model","authors":"L. Csurgai-Horváth, J. Bitó","doi":"10.1109/IWSSC.2007.4409384","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409384","url":null,"abstract":"This paper introduces a method to model the rapid attenuation fluctuations (the scintillation) on satellite links with generating the time series of attenuation levels. The applied model is a hidden Markov model which is parameterized from an appropriate filtered Gaussian white noise signal. For the parameterization of the Markov chain the Baum-Welch expectation-maximization algorithm has been used. The resulting Markov model is applicable to generate scintillation time series for any desired duration with the time and amplitude resolution of the original training data. From the synthesized time series the statistical properties like the cumulative distribution and the dynamics of the scintillation can be also determined. To prove the accuracy of the model at first the cumulative distribution function of the original and synthesized time series are compared. A further test of the model validity is the comparison with real scintillation measurement on a land mobile satellite link. Finally, the spectral test of the filtered Gaussian model, the hidden Markov model and the satellite link measurement shows that the constant and decreasing parts in the periodograms are showing similarities what confirms the good quality of the model.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"16 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":"121700968","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.2007.4409404
C. Kulatunga, G. Fairhurst
The IETF Negative Acknowledgement (NACK) Oriented Reliable Multicast (NORM) protocol offers an attractive solution for small groups that do not have significant receiver heterogeneity. It avoids many of the problems associated with Asynchronous Layered Coding (ALC), such as complexity, Internet Group Management Protocol (IGMP) and routing overhead, lack of TCP friendliness and data duplication. NORM uses a combination of a representative and suppression based approach for reliability and congestion control to avoid multicast feedback implosion. The group's Maximum Round Trip Time (MRTT), maintained at the sender, becomes a metric in this scheme. A large MRTT makes the NORM services very unresponsive. NORM can also be deployed in a heterogeneous network environment where the RTT may differ considerably between sets of users in the network due to their differing propagation delay. An example is when some of the NORM receivers operate over a satellite network, driving the MRTT to a high value. In some satellite scenarios, e.g Digital Video Broadcast - Return Channel via Satellite (DVB-RCS), the feedback packets have to contest for return-path link access. This can lead to large variations in the RTT and results in a MRTT considerably higher than the average RTT. This paper investigates the situations where the NORM framework could be inefficient. By considering the impact on the MRTT, a new mechanism is proposed based on delay-based receiver grouping. This improves the performance of NORM in heterogeneous network environments, including those provided by DVB-RCS satellite networks.
{"title":"Delay-based Sub-grouping for NORM in Heterogeneous Networks","authors":"C. Kulatunga, G. Fairhurst","doi":"10.1109/IWSSC.2007.4409404","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409404","url":null,"abstract":"The IETF Negative Acknowledgement (NACK) Oriented Reliable Multicast (NORM) protocol offers an attractive solution for small groups that do not have significant receiver heterogeneity. It avoids many of the problems associated with Asynchronous Layered Coding (ALC), such as complexity, Internet Group Management Protocol (IGMP) and routing overhead, lack of TCP friendliness and data duplication. NORM uses a combination of a representative and suppression based approach for reliability and congestion control to avoid multicast feedback implosion. The group's Maximum Round Trip Time (MRTT), maintained at the sender, becomes a metric in this scheme. A large MRTT makes the NORM services very unresponsive. NORM can also be deployed in a heterogeneous network environment where the RTT may differ considerably between sets of users in the network due to their differing propagation delay. An example is when some of the NORM receivers operate over a satellite network, driving the MRTT to a high value. In some satellite scenarios, e.g Digital Video Broadcast - Return Channel via Satellite (DVB-RCS), the feedback packets have to contest for return-path link access. This can lead to large variations in the RTT and results in a MRTT considerably higher than the average RTT. This paper investigates the situations where the NORM framework could be inefficient. By considering the impact on the MRTT, a new mechanism is proposed based on delay-based receiver grouping. This improves the performance of NORM in heterogeneous network environments, including those provided by DVB-RCS satellite networks.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"5 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":"115431246","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.2007.4409401
A. Mayer, B. Collini-Nocker, F. Vieira, J. Lei, M. Vazquez Castro
Transmitting variable-length network layer (IP) packets over satellite links with fixed frame lengths (or lengths depending on the ACM transmission mode) requires (IP) encapsulation. For DVB-S links with fixed-size 188-byte TS packets, MPE and ULE encapsulations are available. DVB-S2 provides a compatibility mode to pack TS packets into the longer base band frames (BBFrames). Thus MPE and ULE are also available for S2, as well as a native generic stream encapsulation (GSE), avoiding the double overhead of TS and BBFrame encapsulation. The present paper gives a short overview on the available encapsulation protocols for DVB-S2, and then provides a mathematical efficiency calculation model for these encapsulations, in order to allow for performing theoretical efficiency simulations. Comparison graphs of the efficiency values are presented, using both the efficiency models and measurements from real satellite traffic.
{"title":"Analytical and Experimental IP Encapsulation Efficiency Comparison of GSE, MPE, and ULE over DVB-S2","authors":"A. Mayer, B. Collini-Nocker, F. Vieira, J. Lei, M. Vazquez Castro","doi":"10.1109/IWSSC.2007.4409401","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409401","url":null,"abstract":"Transmitting variable-length network layer (IP) packets over satellite links with fixed frame lengths (or lengths depending on the ACM transmission mode) requires (IP) encapsulation. For DVB-S links with fixed-size 188-byte TS packets, MPE and ULE encapsulations are available. DVB-S2 provides a compatibility mode to pack TS packets into the longer base band frames (BBFrames). Thus MPE and ULE are also available for S2, as well as a native generic stream encapsulation (GSE), avoiding the double overhead of TS and BBFrame encapsulation. The present paper gives a short overview on the available encapsulation protocols for DVB-S2, and then provides a mathematical efficiency calculation model for these encapsulations, in order to allow for performing theoretical efficiency simulations. Comparison graphs of the efficiency values are presented, using both the efficiency models and measurements from real satellite traffic.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"632 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":"114454609","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.2007.4409381
A. K. M. Najmul Islam, E. Lohan, E. Pajala, M. Renfors, A. Lakhzouri, H. Laitinen
During the past few years, accurate positioning of terminals has received much attention in wireless communication. One reason is that of the requirement for emergency call positioning imposed by the authorities. The positioning algorithms based on the Navstar satellites have limitations in the indoor environment because the signal experiences severe attenuation in the indoor environment. The characteristics of the indoor propagation is still not well understood. In many cases, it is assumed that with the deployment of pseudolites, indoor navigation can show better performance. In this paper we analyze the indoor channel propagation using pseudolites, based on the measurement data collected in different scenarios.
{"title":"Indoor fading distributions for GPS-based pseudolite signals","authors":"A. K. M. Najmul Islam, E. Lohan, E. Pajala, M. Renfors, A. Lakhzouri, H. Laitinen","doi":"10.1109/IWSSC.2007.4409381","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409381","url":null,"abstract":"During the past few years, accurate positioning of terminals has received much attention in wireless communication. One reason is that of the requirement for emergency call positioning imposed by the authorities. The positioning algorithms based on the Navstar satellites have limitations in the indoor environment because the signal experiences severe attenuation in the indoor environment. The characteristics of the indoor propagation is still not well understood. In many cases, it is assumed that with the deployment of pseudolites, indoor navigation can show better performance. In this paper we analyze the indoor channel propagation using pseudolites, based on the measurement data collected in different scenarios.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"24 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":"114773885","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.2007.4409414
M. Ramadas, Shawn Ostermann, Hans Kruse
Communicating data in deep-space, across interplanetary distances, entails constraints such as signal propagation delays in the order of minutes and hours, high channel error characteristics, meager and asymmetric bandwidth availability, and disruptions due to planetary orbital dynamics and antenna scheduling constraints on Earth. The licklider transmission protocol (LTP) is being designed as a reliable data transmission protocol optimized for this environment. We present a dynamic priority paradigm for LTP jobs that may help improve the volume and value of data communicated in deep-space by quantifying each job's Intrinsic Value and Immediacy. We study convolutional codes, Reed-Solomon codes, Raptor codes, and some of their combinations, over various channel error rates. We show how the appropriate application of these mechanisms to each job, based on its Immediacy and Intrinsic value, can improve the aggregate value of data transferred over the channel across various job mixes.
{"title":"A Priority Paradigm for Deep Space Data Communication","authors":"M. Ramadas, Shawn Ostermann, Hans Kruse","doi":"10.1109/IWSSC.2007.4409414","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409414","url":null,"abstract":"Communicating data in deep-space, across interplanetary distances, entails constraints such as signal propagation delays in the order of minutes and hours, high channel error characteristics, meager and asymmetric bandwidth availability, and disruptions due to planetary orbital dynamics and antenna scheduling constraints on Earth. The licklider transmission protocol (LTP) is being designed as a reliable data transmission protocol optimized for this environment. We present a dynamic priority paradigm for LTP jobs that may help improve the volume and value of data communicated in deep-space by quantifying each job's Intrinsic Value and Immediacy. We study convolutional codes, Reed-Solomon codes, Raptor codes, and some of their combinations, over various channel error rates. We show how the appropriate application of these mechanisms to each job, based on its Immediacy and Intrinsic value, can improve the aggregate value of data transferred over the channel across various job mixes.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"16 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":"115874173","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.2007.4409389
W. Gappmair, O. Koudelka, S. Cioni, A. Vanelli-Coralli
In the new digital video broadcasting standard for satellite communications (DVB-S2), 16-ary amplitude-phase shift keying (APSK) is recommended as modulation scheme, together with 2/4/8-PSK and 32-APSK as alternatives. For carrier phase recovery with feedback loops, decision-directed (DD) and non- data aided (NDA) detector algorithms are basically applicable to 16-APSK schemes. In a recent paper, however, a hybrid NDA/DD solution has been suggested although not analyzed in detail. Motivated by this fact, the latter is to be investigated in terms of open-loop detector characteristic (S-curve) and jitter variance as the main figures of merit in this respect, but with an additional design parameter introduced for optimization purposes. On the other hand, for comparison reasons, results of power-law and monomial-based Viterbi and Viterbi trackers, as classical NDA solutions, are considered as well.
{"title":"Exact Analysis of Different Detector Algorithms for NDA Carrier Phase Recovery of 16-APSK Signals","authors":"W. Gappmair, O. Koudelka, S. Cioni, A. Vanelli-Coralli","doi":"10.1109/IWSSC.2007.4409389","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409389","url":null,"abstract":"In the new digital video broadcasting standard for satellite communications (DVB-S2), 16-ary amplitude-phase shift keying (APSK) is recommended as modulation scheme, together with 2/4/8-PSK and 32-APSK as alternatives. For carrier phase recovery with feedback loops, decision-directed (DD) and non- data aided (NDA) detector algorithms are basically applicable to 16-APSK schemes. In a recent paper, however, a hybrid NDA/DD solution has been suggested although not analyzed in detail. Motivated by this fact, the latter is to be investigated in terms of open-loop detector characteristic (S-curve) and jitter variance as the main figures of merit in this respect, but with an additional design parameter introduced for optimization purposes. On the other hand, for comparison reasons, results of power-law and monomial-based Viterbi and Viterbi trackers, as classical NDA solutions, are considered as well.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"1 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":"131270167","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.2007.4409383
E. A. Candreva, G. Corazza, A. Vanelli-Coralli
A gradient method is used to obtain the signal constellation that yields to the minimum error probability over a channel affected by non-linear amplification and additive noise. The results show the dominance of phase shift keying when the amplifier is driven near saturation, and the better performance given by amplitude-phase shift keying if the amplifier is operated in its linear region.
{"title":"On the Optimization of Signal Constellations for Satellite Channels","authors":"E. A. Candreva, G. Corazza, A. Vanelli-Coralli","doi":"10.1109/IWSSC.2007.4409383","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409383","url":null,"abstract":"A gradient method is used to obtain the signal constellation that yields to the minimum error probability over a channel affected by non-linear amplification and additive noise. The results show the dominance of phase shift keying when the amplifier is driven near saturation, and the better performance given by amplitude-phase shift keying if the amplifier is operated in its linear region.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"101 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131746467","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.2007.4409394
S. Rosati, S. Cioni, M. Neri, A. Vanelli-Coralli, G. Corazza
In this paper, we present a novel joint symbol timing and carrier frequency synchronization algorithm for orthogonal frequency division multiplexing (OFDM) system with very low hardware complexity. Although we developed the proposed algorithm with reference to the DVB-SH standard, it is easily adaptable to other OFDM based systems. A well-known problem in OFDM modulation is its vulnerability to synchronization errors. In particular, accurate recovery of carrier frequency and symbol timing is crucial for the proper demodulation of the received packets. The proposed algorithm has low hardware complexity, and at the same time achieves very good performance in both AWGN and multipath channels. Finally, the paper includes also a detailed comparison of the proposed technique with several time and frequency synchronization algorithms already presented in the scientific literature and compliant with the DVB-SH physical layer.
{"title":"Joint Symbol Timing and Carrier Frequency Recovery for DVB-SH System","authors":"S. Rosati, S. Cioni, M. Neri, A. Vanelli-Coralli, G. Corazza","doi":"10.1109/IWSSC.2007.4409394","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409394","url":null,"abstract":"In this paper, we present a novel joint symbol timing and carrier frequency synchronization algorithm for orthogonal frequency division multiplexing (OFDM) system with very low hardware complexity. Although we developed the proposed algorithm with reference to the DVB-SH standard, it is easily adaptable to other OFDM based systems. A well-known problem in OFDM modulation is its vulnerability to synchronization errors. In particular, accurate recovery of carrier frequency and symbol timing is crucial for the proper demodulation of the received packets. The proposed algorithm has low hardware complexity, and at the same time achieves very good performance in both AWGN and multipath channels. Finally, the paper includes also a detailed comparison of the proposed technique with several time and frequency synchronization algorithms already presented in the scientific literature and compliant with the DVB-SH physical layer.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"144 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":"133266016","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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