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PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.最新文献

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A novel circle construction for SONET/WDM wavelength assignment 一种用于SONET/WDM波长分配的新型圆结构
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1093/ietcom/e89-b.3.966
Wei Li, T. Gulliver, Wei Zou
{"title":"A novel circle construction for SONET/WDM wavelength assignment","authors":"Wei Li, T. Gulliver, Wei Zou","doi":"10.1093/ietcom/e89-b.3.966","DOIUrl":"https://doi.org/10.1093/ietcom/e89-b.3.966","url":null,"abstract":"Wavelength assignment has become an important issue in SONET/WDM ring design with the application of optical add-drop multiplexers in optical networks. Among wavelength assignment methods, circle construction for all-to-all uniform traffic is of great importance because these circles can be used for wavelength assignment under non-uniform traffic conditions. In this paper, we propose a matrix based circle construction algorithm for all-to-all uniform traffic in a bidirectional SONET/WDM ring. This algorithm divides all-to-all uniform traffic into a group of full circles and so results in an efficient wavelength assignment.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115449370","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
Estimation of fading distribution parameters in noisy channels 噪声信道中衰落分布参数的估计
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517295
Yunfei Chen, N. Beaulieu
{"title":"Estimation of fading distribution parameters in noisy channels","authors":"Yunfei Chen, N. Beaulieu","doi":"10.1109/PACRIM.2005.1517295","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517295","url":null,"abstract":"The problem of estimating parameters of two main fading distributions, Ricean and Nakagami-m, is considered. Unlike most previous estimators which use samples from a noiseless channel, new estimators which use samples from a noisy Ricean or Nakagami-m fading channel, respectively, are proposed. In contrast to the previous work, the noise power in the channel is assumed unknown. Both maximum likelihood designs and moment-based designs are considered. The performances of the new estimators are examined and compared with those of previous estimators derived in the literature. Numerical results show that the new estimators outperform corresponding estimators in the literature when both are operating in noisy environments.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127383033","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
Shape-directed fundus image scaling method applied on an ophthalmology CAD system 形状导向眼底图像缩放方法在眼科CAD系统中的应用
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517293
Kai Sheng, K. Katagishi, K. Toraichi, Y. Mitamura, H. Murakami, A. Koike, T. Asami
{"title":"Shape-directed fundus image scaling method applied on an ophthalmology CAD system","authors":"Kai Sheng, K. Katagishi, K. Toraichi, Y. Mitamura, H. Murakami, A. Koike, T. Asami","doi":"10.1109/PACRIM.2005.1517293","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517293","url":null,"abstract":"Scaling fundus image to the required resolution is one of the important tools in the ophthalmology CAD system. In this paper, we develop a shape-directed fundus image scaling method for the ophthalmology CAD system in which a blood vessels extraction tool is also provided. The method first applies two kinds of functions to record the extracted blood vessels in order to maintain the shape of blood vessels including curvature and relative width at any resolution. The scaling procedure is then directed by these functions and the scaled image with this method has good shape maintenance of blood vessels without jag or blur border usually brought by other methods. The experiment results verify the effectiveness of our method and the measurement of the cross-correlation coefficient between the original image and the scaled image shows the correction of the interpolation kernel selection according to the Fluency information theory.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125288357","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 new technique for improving the speed of double point multiplication 一种提高双点乘法运算速度的新技术
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517374
M. Khabbazian, T. Gulliver, V. Bhargava
{"title":"A new technique for improving the speed of double point multiplication","authors":"M. Khabbazian, T. Gulliver, V. Bhargava","doi":"10.1109/PACRIM.2005.1517374","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517374","url":null,"abstract":"Double point multiplication is a fundamental operation in elliptic curve digital signature verification. In this paper, we propose a new technique to accelerate this operation. Using the proposed technique, we show that a significant improvement in speed can be obtained at the cost of slightly increased bandwidth. We also show that multiple processors can provide substantial performance improvements.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114323397","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
Multilevel optimization of speech coding algorithms for modern DSP architectures 现代DSP架构下语音编码算法的多级优化
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517276
M. Awan, S. Masud, N. Khan, F. Abdullah
{"title":"Multilevel optimization of speech coding algorithms for modern DSP architectures","authors":"M. Awan, S. Masud, N. Khan, F. Abdullah","doi":"10.1109/PACRIM.2005.1517276","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517276","url":null,"abstract":"Real-time implementation of speech coding algorithm requires the DSP code to be highly optimized and the underlying hardware to be fast. This paper presents the results obtained from multi-level optimization of ITU-T G.729A low complexity speech codec on an embedded DSP platform. The implementation platform used in this work is based on analog devices Blackfin BF533 fixed-point media processor. Several high-level and low-level optimization techniques have been concurrently employed in this work to improve the run-time performance of the codec. Improvement in performance has been evaluated through the reduction in MIPS count for each optimization step. Results show that over twenty full-duplex channels of G.729A can be supported on this DSP platform in real-time.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115883848","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
Order statistics for correlated fading channels 相关衰落信道的阶统计量
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517299
M. Elkashlan, T. Khattab, C. Leung, R. Schober
{"title":"Order statistics for correlated fading channels","authors":"M. Elkashlan, T. Khattab, C. Leung, R. Schober","doi":"10.1109/PACRIM.2005.1517299","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517299","url":null,"abstract":"In this paper, a simple procedure for computing the cumulative distribution function (CDF) of the r-th order statistic for correlated Nakagami fading channels with an arbitrary covariance matrix is proposed. This method, numerical in nature, is useful in assessing the impact of correlation on diversity system performance. The method represents a significant theoretical tool that can be applied to the analysis of diversity systems operating over correlative Nakagami-m fading channels. Numerical results are presented to illustrate the effect of fading correlation and fading severity on the received signal statistics.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124328952","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
Implementing multipath source routing in a wireless ad hoc network testbed 在无线自组织网络测试台上实现多路径源路由
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517283
Y. Zhai, O. Yang, Wenlan Wang, Y. Shu
{"title":"Implementing multipath source routing in a wireless ad hoc network testbed","authors":"Y. Zhai, O. Yang, Wenlan Wang, Y. Shu","doi":"10.1109/PACRIM.2005.1517283","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517283","url":null,"abstract":"Ad hoc networks are receiving more and more attentions these years due to their flexibility. This paper introduces the setup of a wireless testbed based on IBM laptops and Cisco wireless cards, discusses the implementation of multipath source routing on Linux Redhat system and provides the measurement results. The performance evaluation of multipath source routing was conducted and compared with dynamic source routing protocol. We demonstrate by experiment that a little bit more overhead can enhance performance and give a more effective source routing.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"29 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124437281","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
Partial RAKE receivers for weak signals in impulsive fading environment 部分RAKE接收机用于脉冲衰落环境下的微弱信号
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517307
Seokho Yoon, S. Choi, S. Park, S. Choi, B. Kim, I. Song
{"title":"Partial RAKE receivers for weak signals in impulsive fading environment","authors":"Seokho Yoon, S. Choi, S. Park, S. Choi, B. Kim, I. Song","doi":"10.1109/PACRIM.2005.1517307","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517307","url":null,"abstract":"The partial RAKE receiver (PRR) is analyzed in the presence of fading and impulsive noise. The maximum likelihood PRR for impulsive, fading channel is derived, and a suboptimum PRR with reduced complexity is obtained. It is shown from numerical results that, when the noise is impulsive, the PRRs designed for impulsive noise offer performance improvement over those optimized for Gaussian environment. It is observed that the suboptimum PRR exhibits almost the same performance as the optimum PRR.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121901334","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
Differentiated services for wireless networks 无线网络差异化业务
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517367
M. Enugula, R. El-Marakby
{"title":"Differentiated services for wireless networks","authors":"M. Enugula, R. El-Marakby","doi":"10.1109/PACRIM.2005.1517367","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517367","url":null,"abstract":"In this paper, we present some of the current work on extending differentiated services architecture to wireless networks to provide QoS. The current approaches explained focus on mobility management, signaling, dynamic resource allocation, and admission control. Various alternatives for bandwidth allocation during mobility are discussed. An adaptive service for streaming applications is also described to improve resource utilization. Finally, we compare the current approaches based on signaling, resource allocation, and admission control.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122005622","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
Effect of imperfect CSI on iteratively decoded BICM over Nakagami fading channels 不完全CSI对中上衰落信道迭代译码BICM的影响
PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005. Pub Date : 2005-10-17 DOI: 10.1109/PACRIM.2005.1517232
C. Polprasert, J. Ritcey
{"title":"Effect of imperfect CSI on iteratively decoded BICM over Nakagami fading channels","authors":"C. Polprasert, J. Ritcey","doi":"10.1109/PACRIM.2005.1517232","DOIUrl":"https://doi.org/10.1109/PACRIM.2005.1517232","url":null,"abstract":"We investigate the impact of imperfect channel state information (CSI) on the bit error rate (BER) performance of uncoded and coded modulation schemes over Nakagami fading channels using the model proposed in C. Polprasert and JA Ritcey (2005). The analytical and asymptotic BER performance of uncoded M-PSK modulation is evaluated and verified by the simulation. For coded modulation, the error free feedback bound (EF bound) of the bit-interleaved coded modulation with iterative decoding (BICM-ID) for both perfect and imperfect CSI is developed. We show that asymptotically, the error floor generated due to imperfect CSI depends on the fading parameter and the power correlation coefficient between the fading coefficient and its estimate.","PeriodicalId":346880,"journal":{"name":"PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005.","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124947757","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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