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2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing最新文献

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Multiple Description Coding Of Video Using Phase Scrambling 基于相位置乱的视频多描述编码
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2008-08-26 DOI: 10.1109/ICME.2008.4607394
S.P. Hojjat, K. F. Sadri, S. Shirani
{"title":"Multiple Description Coding Of Video Using Phase Scrambling","authors":"S.P. Hojjat, K. F. Sadri, S. Shirani","doi":"10.1109/ICME.2008.4607394","DOIUrl":"https://doi.org/10.1109/ICME.2008.4607394","url":null,"abstract":"In this paper, we proposed a method to decrease the effects of data loss in communication of a video sequence using phase scrambling. Phase scrambling is used to spread the data of each pixel of a video sequence over all pixels of the scrambled video. In our experiments we studied the effects of different loss patterns. The results obtained by employing this method shows great improvements compared to cases of data loss without exploiting phase scrambling. This technique can be readily used in transmission of video segments over unreliable networks.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132451996","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
OFDM Interference Suppression for DS/SS Systems using Complex FIR Filter 利用复杂FIR滤波器抑制DS/SS系统的OFDM干扰
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-11-01 DOI: 10.1093/ietfec/e90-a.11.2388
Y. Shimizu, Y. Sanada
{"title":"OFDM Interference Suppression for DS/SS Systems using Complex FIR Filter","authors":"Y. Shimizu, Y. Sanada","doi":"10.1093/ietfec/e90-a.11.2388","DOIUrl":"https://doi.org/10.1093/ietfec/e90-a.11.2388","url":null,"abstract":"In this paper, the performance of narrow band interference (NBI) rejection scheme for direct sequence spread spectrum (DS/SS) is analyzed. A 2-tapped complex FIR filter is used for filtering a chip code to suppress NBI. In this system, the spectrum of transmitted signal has a null at an arbitrary frequency. By choosing filter coefficients, the authors place this null at NBI center frequency to mitigate the effect of NBI. In this paper, an OFDM signal is considered as NBI. The performance of this scheme is theoretically analyzed by introducing Queueing model, and validated via simulation.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","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":"115385981","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
On Construction of Concatenated Low-Density Generator Matrix Codes 关于串联低密度发生器矩阵码的构造
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313269
Y. Kumano, T. Ohtsuki
{"title":"On Construction of Concatenated Low-Density Generator Matrix Codes","authors":"Y. Kumano, T. Ohtsuki","doi":"10.1109/PACRIM.2007.4313269","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313269","url":null,"abstract":"Low-density generator-matrix (LDGM) codes have advantages - fast encoding and parallel decoding, however the performance of the LDGM code is asymptotically bad. This problem can be solved by concatenating two LDGM codes serially. However, little is known about the construction of the concatenated LDGM codes - component LDGM codes, the combination of inner and outer coding rates, inner and outer code weights. In this paper, we investigate the parity check matrix of component LDGM codes that suited to concatenated LDGM codes. We also investigate appropriate combination of inner and outer coding rates and inner and outer code weights, and so on. In addition, we investigate how to set the maximum number of inner and outer iterations for concatenated LDGM codes. Our results are useful for the construction of concatenated LDGM codes.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115692399","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: 3
A Side Information Embedded PTS Scheme in the OFDM Communication System OFDM通信系统中的边信息嵌入式PTS方案
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313234
H. Ryu, Seon-Ae Kim, Chengxiang Wang
{"title":"A Side Information Embedded PTS Scheme in the OFDM Communication System","authors":"H. Ryu, Seon-Ae Kim, Chengxiang Wang","doi":"10.1109/PACRIM.2007.4313234","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313234","url":null,"abstract":"Partial transmit sequence (PTS) scheme has been widely studied to reduce the peak-to-average power ratio (PAPR) of Orthogonal frequency-division multiplexing (OFDM) signal since it is flexible and any spectral regrowth is not made. A necessity of the PTS scheme is to transmit the side information about the phase rotation factors for correct OFDM symbol recovery. In this paper, a new side information embedded PTS scheme using the reference symbols is proposed for the PAPR reduction and the BER performance is analyzed when the erroneous side information is received. In this proposed method, the information about the rotation factors is expressed by the phase of reference symbols. The proposed method maintains the same PAPR reduction performance as the conventional PTS scheme and OFDM symbols are correctly recovered by the side information to meet the required BER level. Also, the proposed method can be easily realized for all kinds of digital modulation formats in the OFDM communication system.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120944849","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
Face Recognition Using Multiscale Gabor Wavelet 基于多尺度Gabor小波的人脸识别
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313229
Lin Huang, Wenjing Zhang
{"title":"Face Recognition Using Multiscale Gabor Wavelet","authors":"Lin Huang, Wenjing Zhang","doi":"10.1109/PACRIM.2007.4313229","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313229","url":null,"abstract":"This paper proposes and analyzes multiscale Gabor wavelet and eigenface method for face recognition. The face images are processed by using one-dimensional (1D) filter masks to extract the Gabor features without two-dimensional (2D) Fourier transform. The results of analysis and experiments show that the computational cost and the storage amount of Gabor features in PGE method are significantly lower than the ones in general 2D Gabor wavelet methods with a comparable recognition rate.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127248708","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
An Architecture and Performance of Maestro3 Cluster Network maestro集群网络的结构与性能研究
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313277
H. Kuribayashi, K. Yasuda, K. Aoki, K. Wada, M. Ono
{"title":"An Architecture and Performance of Maestro3 Cluster Network","authors":"H. Kuribayashi, K. Yasuda, K. Aoki, K. Wada, M. Ono","doi":"10.1109/PACRIM.2007.4313277","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313277","url":null,"abstract":"In cluster computing, communication performance is an important factor that determines overall performance of a cluster. The typical conventional approaches in improving communication performance are to use a dedicated cluster network and/or off loading protocols to network devices. However, in these approaches, the host processor still consumes much computing resources to process communication procedures. To improve efficiency in parallel processing, host processors has to be able to concentrate on primary computation by introducing more aggressive and flexible off loading mechanism. We are currently developing a new cluster network, called Maestro3, which has a capability of off loading user-defined software modules. Both a network interface and a switch of Masetro3 include a general purpose processor, which is tightly coupled with network hardware, and a high-capacity memory. This paper presents an architecture and preliminary evaluation of Maestro3 cluster network.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125290855","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
Lossless Compression of Error Diffused Images by Coding Multi-Level Images Having Least Entropy 基于最小熵多层图像编码的误差扩散图像无损压缩
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313175
F. Ono, M. Kitamura
{"title":"Lossless Compression of Error Diffused Images by Coding Multi-Level Images Having Least Entropy","authors":"F. Ono, M. Kitamura","doi":"10.1109/PACRIM.2007.4313175","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313175","url":null,"abstract":"A lossless compression of an error-diffused image by lossless coding of entropy-minimized multi-level image, which can produce given halftone image at the receiver side, is studied. Through the study, block-type error diffusion is introduced to consider the two-dimensional entropy, and both of entropy-based prioritisation method and prediction-error-based prioritisation method in inverse halftoning procedure are proposed and compared. The result shows that the restored image by proposed methods has about 40% less entropy than that of the original multi-level image, but 50-70% larger than that of halftone image. However through the simulation of pseudo high resolution images, it was expected that the proposed method could even show less entropy than that of the bi-level image in higher resolution cases.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115256777","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
A Built-in Application Control Module for SAGE SAGE内置应用控制模块
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313191
S. Kuwabara, K. Ichikawa, S. Date, S. Shimojo
{"title":"A Built-in Application Control Module for SAGE","authors":"S. Kuwabara, K. Ichikawa, S. Date, S. Shimojo","doi":"10.1109/PACRIM.2007.4313191","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313191","url":null,"abstract":"Recently, the amount of scientific data has been increasing because of technological advancement in measurement and high-performance computing. As the result, visualization technologies are becoming increasingly important to analyze the scientific data. Among visualization technologies, SAGE is gathering attention of scientists in these days. It not only enables the visualization of tens of million pixel-class high-resolution image but also has the potential to realize the collaboration environment where scientists can work together for their common research purpose. However, there remain still technical issues in SAGE, since it is still in the process of development. A problem of application operability, which prevents SAGE users from efficiently operating various applications on SAGE, is targeted in this paper. This problem is caused from the architectural design that SAGE users have to manage window-related operation and application-related operation from different interfaces. For solving the problem, we have developed a built-in application control module for SAGE. Our built-in application control module unifies the separate interfaces for window management and application operation. As a result, users can control application from a unified user interface, SAGE UI.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121838084","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
Investigating high-speed transport protocol flows on 10-gigabit testbed JGNII; with monitoring the Linux kernel internally 在10gb JGNII测试台上研究高速传输协议流在内部监视Linux内核
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313194
K. Kumazoe, M. Tsuru, Y. Oie
{"title":"Investigating high-speed transport protocol flows on 10-gigabit testbed JGNII; with monitoring the Linux kernel internally","authors":"K. Kumazoe, M. Tsuru, Y. Oie","doi":"10.1109/PACRIM.2007.4313194","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313194","url":null,"abstract":"The recent deployment of high-speed network equipment has made it possible for us to enjoy the benefit of high-speed transport protocols in 10-gigabit-class networks. However, a TCP flow in such high-speed environments might cause extremely bursty traffic that could create a bottleneck anywhere in the end-to-end path, i.e., sender/receiver hosts could be bottlenecks. Therefore, we have been developing TCPVisible, an easy-to-use tool for monitoring TCP/UDP-related internal dynamics at sender and receiver hosts in detail, which allows us to know when and where packet losses have occurred internally in the kernel. We introduce preliminary experiments in this paper investigating the performance of two kinds of high-speed transport protocols (HTCP and BIC) in 10-Gbps paths between the US and Japan, where the usefulness of TCPVisible could be demonstrated.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116851569","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
Domain Dependent Word Segmentation Based on Conditional Random Fields 基于条件随机场的领域相关分词
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 2007-09-24 DOI: 10.1109/PACRIM.2007.4313226
T. Fukuda, M. Izumi, T. Miura
{"title":"Domain Dependent Word Segmentation Based on Conditional Random Fields","authors":"T. Fukuda, M. Izumi, T. Miura","doi":"10.1109/PACRIM.2007.4313226","DOIUrl":"https://doi.org/10.1109/PACRIM.2007.4313226","url":null,"abstract":"In this investigation, we propose an experimental approach for word segmentation in Japanese under domain-dependent situation. We apply Conditional Random Fields (CRF) to our issue. CRF learns several probabilistic parameters from training data with specific feature functions dependent on domains. Here we propose how to define domain specific feature functions.","PeriodicalId":395921,"journal":{"name":"2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417345","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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