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2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing最新文献

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Performance of DWT-ANN based signal detector/equalizer for DPIM in practical indoor optical wireless links 基于DWT-ANN的DPIM信号检测器/均衡器在实际室内光无线链路中的性能
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610825
S. Rajbhandari, Zabih Ghassemlooy, M. Angelova
{"title":"Performance of DWT-ANN based signal detector/equalizer for DPIM in practical indoor optical wireless links","authors":"S. Rajbhandari, Zabih Ghassemlooy, M. Angelova","doi":"10.1109/CSNDSP.2008.4610825","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610825","url":null,"abstract":"Artificial neural network (ANN) finds its application in communication engineering in a diverse areas such as channel equalization, channel modelling, error control code because of its capability of nonlinear processing, adaptability, and parallel processing. On the other hand, the wavelet transform (WT) with both the time and the frequency resolution provides the exact representation of signal in both domains. Applying these modern tools to signal processing in channel equalization and digital signal detection provide an enhanced performance compared to the traditional tools. In this paper, the slot error rate (SER) performance of digital pulse interval modulation (DPIM) in diffuse indoor optical wireless links employing equalization using discrete WT (DWT) and ANN is reported. The simulation results show that a performance gain of ~8 dB is achieved by utilizing the new approach compared to the traditional approach based on the finite impulse response (FIR) digital filters.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132429601","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
Performance analysis of non-directed equalized indoor optical wireless systems 非定向均衡室内无线光学系统性能分析
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610720
G. Ntogari, T. Kamalakis, T. Sphicopoulos
{"title":"Performance analysis of non-directed equalized indoor optical wireless systems","authors":"G. Ntogari, T. Kamalakis, T. Sphicopoulos","doi":"10.1109/CSNDSP.2008.4610720","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610720","url":null,"abstract":"Indoor optical wireless systems provide an attractive alternative for realizing next generation wireless local area networks (WLANs). In this paper, the potential of non-directed, equalized optical wireless systems is investigated, taking into account the indoor channel impulse response and the characteristics of ambient light noise and thermal noise at the receiver. Two modulation schemes, pulse-position-modulation and on-off keying, are combined with appropriate equalization methods in order to examine the capacity limits of non-directed infrared wireless systems. It is shown that the various non-directed configurations can provide data rates of the order of 100 Mb/s and beyond, over a medium sized room.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114826931","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: 10
Multi-space random projection of face biometric in the radon domain 人脸生物特征在氡域的多空间随机投影
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610785
M. Dabbah, S. Dlay, W. L. Woo
{"title":"Multi-space random projection of face biometric in the radon domain","authors":"M. Dabbah, S. Dlay, W. L. Woo","doi":"10.1109/CSNDSP.2008.4610785","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610785","url":null,"abstract":"Biometric authentication cannot replace traditional authentication systems unless biometric data is sufficiently protected during the entire authentication procedure. In this paper a novel method to protect face biometric is presented. The randomized Radon signature (RRS) overcomes the natural limitations of biometrics by providing unique, non-reversible and reissuable templates to replace face images in storage and during processing. The face image is transformed into the Radon space where the signatures are constructed and then projected into a random multi-space. Using the eigenface algorithm for evaluation, the results have shown a 252.78% improvement in the separation of the genuine and impostor distributions leading to an 81.49% reduction in the equal error rate.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114997331","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
Development of a competition model for a cryptosystem based on the analytical hierarchic process 基于层次分析法的密码系统竞争模型的建立
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610715
J. Serey, L. Quezada, B. Ontiveros, I. Soto, R. Carrasco
{"title":"Development of a competition model for a cryptosystem based on the analytical hierarchic process","authors":"J. Serey, L. Quezada, B. Ontiveros, I. Soto, R. Carrasco","doi":"10.1109/CSNDSP.2008.4610715","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610715","url":null,"abstract":"The objective of this paper is to develop and to validate a competition model which allows to determine when a cryptosystem type is the best-suiteddest to transmit in a communications channel, depending on the kind of technological used device (cellular phone, PDA, notebook, other ones). The results obtained for this dynamic analysis determine the kind of encryption that should be used at the channel in a given time.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117337487","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
Forecasting of traffic load in a live 3G packet switched core network 实时3G分组交换核心网的流量负荷预测
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610775
P. Svoboda, M. Buerger, M. Rupp
{"title":"Forecasting of traffic load in a live 3G packet switched core network","authors":"P. Svoboda, M. Buerger, M. Rupp","doi":"10.1109/CSNDSP.2008.4610775","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610775","url":null,"abstract":"In this paper we analyze different methods for long term forecasts of packet switched traffic from live 3G networks. The dataset consists of over 400 values, each representing the peak load for a separate day. Four different methods were applied to forecast the increase in traffic, two simple: linear and exponential regression, and two more sophisticated ARMA and DHR. We will show in which cases the sophisticated models deliver a better performance and discuss the question if the gain is significant to justify the increased complexity. We present numerical results for long, e.g., more than 100 day, and short time,e.g., hourly or daily, fitting for our case study based on real traces from a live network. The paper concludes with a benchmark based on the observed mean absolute error.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122084331","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: 10
Performance analysis of decentralized user information management system for peer-to-peer real-time communication services 面向点对点实时通信业务的分散用户信息管理系统性能分析
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610821
K. Kuraya, H. Masuyama, S. Kasahara, Y. Takahashi
{"title":"Performance analysis of decentralized user information management system for peer-to-peer real-time communication services","authors":"K. Kuraya, H. Masuyama, S. Kasahara, Y. Takahashi","doi":"10.1109/CSNDSP.2008.4610821","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610821","url":null,"abstract":"Recently, Skype has been receiving considerable attention as a peer-to-peer (P2P) Internet telephony application. In Skype, a voice connection is established via super nodes chosen from among ordinary end-user nodes. User information such as an IP address and port number of an online Skype node is managed by super nodes in a decentralized manner where the number of super nodes changes dynamically according to the number of online Skype nodes. In this paper, we analyze the performance of this decentralized management system of user information. In our analytical model, new nodes join the system according to a nonstationary Poisson process, and the online-node process associated with the number of super nodes is analyzed with a nonstationary Markov chain. We derive the system of difference-differential equations for the probability distribution of the number of online nodes to compute performance measures using the stationary peakedness approximation method. Numerical examples show that the user-information management system based on P2P can keep the quality of service (QoS) more stable than a client-server system with a centralized server of high performance.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124703981","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
Call Blocking Probabilities in a W-CDMA cell with fixed number of channels and finite number of traffic sources 具有固定信道数量和有限流量源数量的W-CDMA小区中的呼叫阻塞概率
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610704
G. Kallos, V. Vassilakis, M. Logothetis
{"title":"Call Blocking Probabilities in a W-CDMA cell with fixed number of channels and finite number of traffic sources","authors":"G. Kallos, V. Vassilakis, M. Logothetis","doi":"10.1109/CSNDSP.2008.4610704","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610704","url":null,"abstract":"This paper focuses on the call blocking probabilities calculation in a W-CDMA cell with fixed number of channels and finite number of traffic sources. To this end, the use of the Engset multirate loss model (EnMLM) is proposed in the uplink direction. To apply the EnMLM we need to extend it by incorporating the so called local blockings. Arriving calls compete for their successful admission to a W-CDMA cell. The call admission depends on the availability of the required channels. To analyze the system, we formulate an aggregate one-dimensional Markov chain, and based on it, we determine the system state probabilities by an efficient recurrent formula. Consequently, we determine the call blocking probabilities in the uplink direction. Although the proposed model is approximate, its accuracy is found to be quite satisfactory. The evaluation is done through simulation. Moreover, the model performs better than the existing model which assumes infinite number of traffic sources in the cell.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128205923","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: 18
Performance investigation of pattern effect suppression in semiconductor optical amplifier using optical delay interferometer 利用光延迟干涉仪抑制半导体光放大器图样效应的性能研究
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610762
K. Zoiros, T. Siarkos, C. Koukourlis
{"title":"Performance investigation of pattern effect suppression in semiconductor optical amplifier using optical delay interferometer","authors":"K. Zoiros, T. Siarkos, C. Koukourlis","doi":"10.1109/CSNDSP.2008.4610762","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610762","url":null,"abstract":"The ability of an optical delay interferometer (ODI) to suppress the pattern effect in a semiconductor optical amplifier (SOA) whose dynamic response is slower than the period of its driving high-speed return-to-zero (RZ) data signal is demonstrated through numerical simulation and theoretical analysis.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127438815","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
Broadband NFC - A system analysis for the uplink 宽带NFC -一个系统分析的上行链路
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610713
D. Rinner, H. Witschnig, E. Merlin
{"title":"Broadband NFC - A system analysis for the uplink","authors":"D. Rinner, H. Witschnig, E. Merlin","doi":"10.1109/CSNDSP.2008.4610713","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610713","url":null,"abstract":"Near field communication (NFC) is a new, short-range wireless connectivity technology that evolved from a combination of existing contactless identification and interconnection technologies. Products with built-in NFC will have the aim to simplify the way consumer devices interact with one another. Data-intensive applications based on NFC or applications for health care/e-government need an increase from the actual defined and standardised transmission rates of 424 kbit/s to a higher rate. The topic of this paper is to point out physical layer parameters, limitations and concepts, allowing to enhance the transmission rate of the 13.56 MHz NFC-systems. Finally one implementation of a lab scaled prototype with a transmission rate of 6.78 Mbit/s from card to reader is demonstrated and discussed.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130065701","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: 7
A multi-objective optimization framework for video compression and transmission 视频压缩与传输的多目标优化框架
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing Pub Date : 2008-07-25 DOI: 10.1109/CSNDSP.2008.4610736
A. Al-Najdawi, R. Kalawsky
{"title":"A multi-objective optimization framework for video compression and transmission","authors":"A. Al-Najdawi, R. Kalawsky","doi":"10.1109/CSNDSP.2008.4610736","DOIUrl":"https://doi.org/10.1109/CSNDSP.2008.4610736","url":null,"abstract":"In video transmission over low-bandwidth channels, high-quality video and sufficient channel throughput should be guaranteed. The last two decades have witnessed an unprecedented growth of wireless communication technologies. It turned out that competition for bandwidth resources is fierce, and onboard power and weight constraints in autonomous vehicles limit the maximum data transmission rates. These factors highlight a critical need for very effective data compression schemes. Images tend to be the most bandwidth-intensive data; therefore, image and video compression methods are particularly valuable. In this paper, the authors present a novel technique for optimizing video compression while visual quality is not compromised. This opens up new scopes in the domain of visual quality assessment of images and videos returned from autonomous vehicles.","PeriodicalId":241330,"journal":{"name":"2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130154680","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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