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2007 International Symposium on Intelligent Signal Processing and Communication Systems最新文献

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Study on the MAC protocol for integrated Ad hoc networks and TD-SCDMA 集成Ad hoc网络和TD-SCDMA的MAC协议研究
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445890
Suyi Zhang, Lianfeng Shen, Bo Xu
{"title":"Study on the MAC protocol for integrated Ad hoc networks and TD-SCDMA","authors":"Suyi Zhang, Lianfeng Shen, Bo Xu","doi":"10.1109/ISPACS.2007.4445890","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445890","url":null,"abstract":"We propose a medium access control (MAC) protocol for networks that integrated TD-SCDMA and Ad hoc networks. The protocol is collision-free and TD-SCDMAand operates under dynamic and distributed circumstances; it can improve channel utilization rate and increase the number of nodes simultaneously accessible to channel by combining control channel and transmission channel in one slot, and each channel is represented by different spreading codes. In this protocol, terminal node can achieve natural cellular communication and operate in ad hoc networks. Thus, the networks can efficiently expand the coverage of the mobile communication system and balance traffic loads. The performance analysis result shows that the proposed scheme proves to achieve good performance in terms of average access probability, throughput and average access delay.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126465346","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
Lightening the interference in three-dimension wireless sensor networks 减轻三维无线传感器网络中的干扰
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445914
Peng Quo, Guangxi Zhu, Xiaoming Lu
{"title":"Lightening the interference in three-dimension wireless sensor networks","authors":"Peng Quo, Guangxi Zhu, Xiaoming Lu","doi":"10.1109/ISPACS.2007.4445914","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445914","url":null,"abstract":"Interference is the main factor that limits capacity of wireless sensor networks. People always consider the interference due to exposed nodes and hidden nodes, however, the interference outside of communication range also influence the data reception. In three-dimension wireless networks, this interference is too serious to be neglected. The paper discusses all the interference in three-dimension wireless sensor networks, gives a formulation about the relationship between interference and the scale of networks, and proposes a media access method which abates interference greatly and assures nodes to successfully receive packets with high probability.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"29 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132477114","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
CSGW-RAS: A novel secure solution for remote access based on SSL CSGW-RAS:一种基于SSL的新型远程访问安全解决方案
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4446008
Yada Hu, H. Yin, Chuang Lin, Xin Jiang, Y. Ouyang, C. Li
{"title":"CSGW-RAS: A novel secure solution for remote access based on SSL","authors":"Yada Hu, H. Yin, Chuang Lin, Xin Jiang, Y. Ouyang, C. Li","doi":"10.1109/ISPACS.2007.4446008","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4446008","url":null,"abstract":"A novel secure solution for remote access is proposed. Compared with the previous methods such as dial-up and vpn, our solution CSGW-RAS is quite new at using SSL for data transfer and GNU/Linux pseudo network device for data forward. It offers two important types of properties. One is security, which includes confidentiality, IP assigning and authentication, etc. We compare CSGW-RAS with IPSec VPN which is widely-used for its high security, by using a security risk index. The results shows that our solution is as secure as IPSec VPN. The other is simplicity. CSGW-RAS completely throws away the complexity both in deployment and in operation but is different with the so-called SSL VPN which is just a Web proxy. The security and performance analysis show that our solution is quite secure and easy-to-use with a little lost in efficiency which results from the handshake process but would not affect its whole performance.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134256777","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
A novel CAI for combining Ad hoc and TD-SCDMA network 一种结合Ad hoc和TD-SCDMA网络的新型CAI
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445844
Ming Wu, Tiecheng Song, Lianfeng Shen
{"title":"A novel CAI for combining Ad hoc and TD-SCDMA network","authors":"Ming Wu, Tiecheng Song, Lianfeng Shen","doi":"10.1109/ISPACS.2007.4445844","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445844","url":null,"abstract":"For the potential gains in the capacity and the coverage of cellular network, a common air interface (CAI), including the smooth handover function, should be achieved with a single terminal by combining ad hoc network and TD-SCDMA. In this paper, we firstly introduce the frame structure and time slots allocation of TD-SCDMA. Secondly, a communication coexistent strategy that makes use of the idle slots in cellular communication is described. Then the paper proposes a new compatible CAI based on the conception of superframe. Later the corresponding communication process of the air interface is presented. Finally, several performance parameters of this system are analyzed, including the average number of success reservation nodes and the average access time delay. The analysis results indicate that the good performance can be achieved by this common air interface.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128932760","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: 1
Image fusion using a contourlet HMT model 使用contourlet HMT模型进行图像融合
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445978
Min Wang, Dongliang Peng, Zhanwen Liu, Shuyuan Yang
{"title":"Image fusion using a contourlet HMT model","authors":"Min Wang, Dongliang Peng, Zhanwen Liu, Shuyuan Yang","doi":"10.1109/ISPACS.2007.4445978","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445978","url":null,"abstract":"In this paper hidden Markov tree (HMT) based image fusion methods are investigated. Considering the failure of wavelet in representing the geometry of image edges in dimension 2, here a new contourlet HMT model for image fusion is proposed. Because the CHMT model efficiently captures all dependencies across scales, space and directions through a tree structured dependence network, it can give more accurate description of images. Moreover, the CHMT has a simple tree structure with fewer parameters than wavelet HMT (WHMT), which enables efficient training using the expectation maximization (EM) algorithm. Inputting the contourlet coefficients of source images to train the CHMT model, we can get the edge probability density functions. Local inner-product fusion rule is performed on the high- frequency directional sub-bands, which is acquired by the product of the high-frequency directional coefficients by the edge probability density function of CHMT. The low- frequency sub-bands are compared to preserve the coefficients whose module are minimum. The experiment results show the superiority of the proposed image fusion method to WHMT and contourlets, both in image clarity, implementation speed, standard deviation, average gradient and average cross entropy.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130747643","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
Efficient free viewpoint image reconstruction from multi-focus imaging sequences based on dimension reduction 基于降维的多焦点图像序列的高效自由视点图像重建
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445846
X. Ou, T. Hamamoto, K. Kodama
{"title":"Efficient free viewpoint image reconstruction from multi-focus imaging sequences based on dimension reduction","authors":"X. Ou, T. Hamamoto, K. Kodama","doi":"10.1109/ISPACS.2007.4445846","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445846","url":null,"abstract":"This paper deals with the technique for generating free viewpoint images by using multi-focus imaging sequences. The method may enable us to realize dense 4-D ray-space reconstruction from 3-D multi-focus imaging sequences. Previously, we proposed a method of generating free viewpoint, iris and focus images directly from multi-focus imaging sequences with a 3-D convolution filter that expresses how the scene is defocused in the sequence. However, the cost of the spatial frequency analysis based on 3-D FFT is not inexpensive. In this paper, efficient reconstruction of free viewpoint images by dimension reduction and 2-D FFT is discussed. We show some experimental results by using synthetic images. Epipolar plane images are also reconstructed in order to estimate the disparity between generated free viewpoint images.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127864320","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: 5
A modified Toeplitz algorithm for DOA estimation of coherent signals 相干信号DOA估计的改进Toeplitz算法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445828
Chen Hui, Huang Ben-xiong, Deng Bin, Hou Yaoqin
{"title":"A modified Toeplitz algorithm for DOA estimation of coherent signals","authors":"Chen Hui, Huang Ben-xiong, Deng Bin, Hou Yaoqin","doi":"10.1109/ISPACS.2007.4445828","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445828","url":null,"abstract":"A new algorithm based on cross-correlation vector Toeplitz reconstruction, called CVT method, is proposed in this paper. The CVT method can estimate coherent signal source effectively. The CVT utilizes the internal relation of array receiving data to realize signal sources de-coherent. Compared with the classical spatial smoothing algorithms the proposed algorithm has higher estimation precision under the condition of the same phase. The reason is that the CVT method can realize de-coherent completely, but the spatial smoothing algorithms realize rank reconstruction only. The produce of rank reconstruction introduces cross- correlation noise into modified signal covariance matrix. But the CVT method can transform the signal covariance matrix of coherent source into diagonal matrix. Therefore, the CVT algorithm has some advantages of low computational load, better robustness and higher estimation precision than spatial smoothing algorithm. The theoretical analysis and simulation results show that the proposed method is effective.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133819944","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: 9
Common-mode rejection ratio analysis of rail-rail input stage fully differential two-stage OP-AMP 轨-轨输入级全差动两级运放共模抑制比分析
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445919
K. Trijpech
{"title":"Common-mode rejection ratio analysis of rail-rail input stage fully differential two-stage OP-AMP","authors":"K. Trijpech","doi":"10.1109/ISPACS.2007.4445919","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445919","url":null,"abstract":"A fully differential rail-rail input stage and class AB output stage with and without common-mode feedback circuit are proposed. There are at least 4 schematics to be proposed. The first schematic is CMOS rail-rail input stage and class AB output stage without common-mode feedback (CMFB) circuit. The second schematic is CMOS rail-rail input stage and class AB output stage with CMFB circuit. For low voltage operation, the tail current sources of the first and second schematics are removed. As a consequence, there is no voltage drop between drain and source terminals of the current source, and bulk-source voltage effect of the input transistor is removed.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115702622","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: 1
SAR image segmentation based on spatially adaptive weighted possibilistic c-means clustering 基于空间自适应加权可能性c均值聚类的SAR图像分割
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445884
X. Tian, S. Gou, L. Jiao
{"title":"SAR image segmentation based on spatially adaptive weighted possibilistic c-means clustering","authors":"X. Tian, S. Gou, L. Jiao","doi":"10.1109/ISPACS.2007.4445884","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445884","url":null,"abstract":"Due to the influence of speckle in synthetic aperture radar (SAR) image, statistical dependencies among neighboring pixels should be considered in SAR image segmentation. The spatially adaptive weighted possibilistic c-means (SAW-PCM) clustering algorithm is proposed in which spatial information is introduced into PCM approach to directly adjust the membership. The relationship between the neighboring pixels is described through Markov random fields (MRF). To preserve detail information in SAR images, the directional neighborhood system set is established. The selection of neighborhood systems is based on similarity measurement (SM) between wavelet energies of comprehensive result of steerable wavelet transform. Among the different neighborhood alternatives, the one with the highest SM value is chosen to compute the weight value. The experimental results on real SAR images demonstrate the merit of the proposed method, especially in the preservation of details within a SAR image.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115705249","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
Image super-resolution reconstruction based on adaptive interpolation norm regularization 基于自适应插值范数正则化的图像超分辨率重建
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445983
Yubing Han, F. Shu, Qingchuan Zhang
{"title":"Image super-resolution reconstruction based on adaptive interpolation norm regularization","authors":"Yubing Han, F. Shu, Qingchuan Zhang","doi":"10.1109/ISPACS.2007.4445983","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445983","url":null,"abstract":"An image super-resolution reconstruction algorithm is proposed based on adaptive interpolation norm regularization, which can not only preserve more details near image edges than Tikhonov regularization, but also efficiently alleviate the staircasing of total variation regularization on flat regions. Furthermore, we propose the use of regularization functional instead of a constant regularization parameter. The regularization functional is defined in terms of the restored image at each iteration step, therefore allowing for the simultaneous determination of its value and the restoration of the degraded image. The iteration scheme, convergence and control function are thoroughly studied. Experimental results demonstrate the power of the proposed method.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114464346","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
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