2009 First International Conference on Advances in Satellite and Space Communications最新文献

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Automatic Registration of Satellite Images 自动配准卫星图像
C. Serief, Y. Bentoutou, M. Barkat
{"title":"Automatic Registration of Satellite Images","authors":"C. Serief, Y. Bentoutou, M. Barkat","doi":"10.1109/.18","DOIUrl":"https://doi.org/10.1109/.18","url":null,"abstract":"In remote sensing applications, the traditional procedure for registering a pair of images requires the manual selection of ground control points at significant landmarks of the images. The primary drawback of this approach is that a trained expert is needed to manually select each individual ground control point in the remotely sensed images. This is very laborious and time consuming. In this paper, a new feature-based approach to automate image-to-image registration is proposed for remote sensing applications. This new approach exploits the nonsubsampled contourlet transform to automatically extract a set of control points across spatial and directional resolutions where misalignment between images can be expected to appear. Preliminary experimental results demonstrate the effectiveness and accuracy of the proposed algorithm.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123033729","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}
引用次数: 4
Voice Activity Detection Based on Wavelet Packet Transform in Communication Nonlinear Channel 通信非线性信道中基于小波包变换的语音活动检测
R. Chiodi, D. Massicotte
{"title":"Voice Activity Detection Based on Wavelet Packet Transform in Communication Nonlinear Channel","authors":"R. Chiodi, D. Massicotte","doi":"10.1109/.27","DOIUrl":"https://doi.org/10.1109/.27","url":null,"abstract":"This paper presents a voice activity detection (VAD) algorithm based on the Wavelet Packet Transform and the Teager Energy Operation (TEO) processing. The signal is decomposed into subband signals. We used the multi-resolution analysis property of the Wavelet Transform to extract and analyse time-frequency components corresponding to speech. In order to obtain a parameter called Voice Activity Shape (VAS), we used TEO processing to better distinguish subband signals corresponding to speech. The subband variance values of each TEO signal are summed to obtain the VAS, which is higher in speech regions than in non speech regions. Experimental results show that our VAD perform better than the G729B, particularly in difficult noise conditions and also in the case when the speech sound is passed in a nonlinear communication channel. Experimental results are shown in the case of real speech communications from a spaceship to terrestrial 3G cellular network assuming nonlinear interferences.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123989430","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}
引用次数: 6
Analyses and Suppression Method of Frequency Offset and Timing Offset in FH-OFDM System 跳频- ofdm系统中频偏和时偏的分析与抑制方法
Xiupei Zhang, H. Ryu, B. Jo, G. Baek
{"title":"Analyses and Suppression Method of Frequency Offset and Timing Offset in FH-OFDM System","authors":"Xiupei Zhang, H. Ryu, B. Jo, G. Baek","doi":"10.1109/.8","DOIUrl":"https://doi.org/10.1109/.8","url":null,"abstract":"Recently, FH-OFDM (frequency hopping orthogonal frequency division multiplexing) system has been widely used in communication system. However, FH-OFDM system is sensitive to frequency offset and timing offset, which are inherently unavoidable in wireless mobile communication systems and can seriously degraded system performance. So, research on estimation and compensation of these offsets is of great importance. In this paper, a novel joint method for estimating carrier frequency offset and timing offset is proposed. This algorithm exploits pilots to estimate the offsets, and compared with other methods, the processing can be completed in one symbol time period. Thus, this method can be used in both static and ergodic channel. The estimation can be divided into frequency offset estimation and timing offset estimation. Also, both frequency offset and timing offset estimation are divided into two steps: coarse frequency offset estimation step, fine frequency offset estimation step, fraction timing offset estimation step and integer timing offset estimation step. Through the computer simulations, the suggested algorithm shows very good performance results both in AWGN and multipath environments.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126939403","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}
引用次数: 2
Advances in Latin American Satellite Communications 拉丁美洲卫星通信的进展
A. Yarali, Sebastian Coe
{"title":"Advances in Latin American Satellite Communications","authors":"A. Yarali, Sebastian Coe","doi":"10.1109/.32","DOIUrl":"https://doi.org/10.1109/.32","url":null,"abstract":"While many still view Latin America as a third world region that is lacking the necessary infrastructure and technical prowess in order to sustain long-term investment in complex satellite communications technology, a brief historical review reveals that this is far from the truth. As a result of over a half-century of experimentation and development in rocketry and satellite technologies, Latin America, in only a few decades, has been able to implement a number of sophisticated applications. Favorable political conditions, combined with a renewed interest in investing in technologies that traditionally have been seen as high-risk, promise a host of new opportunities for both consumers and industry players in the Latin America satellite telecommunications market.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125388742","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}
引用次数: 0
Reduced Cluster Search ML Decoding for QO-STBC Systems QO-STBC系统的简化聚类搜索ML解码
I. Suzuki, T. Abrão, B. Angélico, F. Ciriaco, P. Jeszensky, F. Casadevall
{"title":"Reduced Cluster Search ML Decoding for QO-STBC Systems","authors":"I. Suzuki, T. Abrão, B. Angélico, F. Ciriaco, P. Jeszensky, F. Casadevall","doi":"10.1109/.17","DOIUrl":"https://doi.org/10.1109/.17","url":null,"abstract":"Since the maximum likelihood (ML) decoding results too complex when the modulation order and the number of receive antennas increase, an efficient reduced complexity ML-based decoding scheme applied to a multiple-input-multiple-output (MIMO) antenna systems with quasi-orthogonal space-time block code (QO-STBC) is proposed, and named reduced cluster search ML decoding (RCS-ML). Its performance and complexity aspects are compared to the conventional ML decoding approach. High-order modulation indexes and short low density parity check codes (LDPC) are considered. Numerical results have indicated no degradation in the performance and an increasing reduction in the complexity of RCS-ML decoding with respect to the conventional ML when the modulation order increases.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128365814","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}
引用次数: 4
LDPC-Based Iterative Algorithm for Compression of Correlated Sources at Rates Approaching the Slepian-Wolf Bound 基于ldpc的相关源趋近Slepian-Wolf界速率压缩迭代算法
F. Daneshgaran, M. Laddomada, M. Mondin
{"title":"LDPC-Based Iterative Algorithm for Compression of Correlated Sources at Rates Approaching the Slepian-Wolf Bound","authors":"F. Daneshgaran, M. Laddomada, M. Mondin","doi":"10.1109/.13","DOIUrl":"https://doi.org/10.1109/.13","url":null,"abstract":"This article proposes a novel iterative algorithm based on Low Density Parity Check (LDPC) codes for compression of correlated sources at rates approaching the Slepian-Wolf bound. The setup considered in the article looks at the problem of compressing one source at a rate determined based on the knowledge of the mean source correlation at the encoder, and employing the other correlated source as side information at the decoder which decompresses the first source based on the estimates of the actual correlation. We demonstrate that depending on the extent of the actual source correlation estimated through an iterative paradigm, significant compression can be obtained relative to the case the decoder does not use the implicit knowledge of the existence of correlation.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125945478","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}
引用次数: 2
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