Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401661
Yan Zheng, Yue Ping
The emerging ultra wideband (UWB) system offers a great potential for the design of high speed short-range wireless communications. In order to obtain the higher data rates and high capacity, one possible solution is to exploit both spatial and multipath diversities via the use of multiple-input multiple-output (MIMO) and proper coding techniques. The major problems of such systems are high cost and complexity due to more than one radio frequency (RF) chains at both end links. An effective technique to reduce this overhead is to allow the transmitter and/or the receiver to select an optimum antenna subset according to some optimization criterion. In this paper .based on traditional MB-OFDM ultra-wide band physics level structure, we analyze coded multiple-input/multiple output (MIMO) systems with antenna selection at the transmitter side. Proposed an optimum selection criterion to minimize the bit error ratio (BER) and Improved the algorithm to reduce the computation quantity when a channel adapted space-time block coding (STBC) are used. The simulation result indicated that, the STBC-MB-OFDM system may obtain the better diversity gain under the low signal to noise ratio, and the system with antenna selection is reduced the bit error ratio (BER) and complexity in the revision S-V channel.
{"title":"Performance analysis of the MB-OFDM ultra-wide band communication system with space-time block coding and antenna selection","authors":"Yan Zheng, Yue Ping","doi":"10.1109/CANET.2007.4401661","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401661","url":null,"abstract":"The emerging ultra wideband (UWB) system offers a great potential for the design of high speed short-range wireless communications. In order to obtain the higher data rates and high capacity, one possible solution is to exploit both spatial and multipath diversities via the use of multiple-input multiple-output (MIMO) and proper coding techniques. The major problems of such systems are high cost and complexity due to more than one radio frequency (RF) chains at both end links. An effective technique to reduce this overhead is to allow the transmitter and/or the receiver to select an optimum antenna subset according to some optimization criterion. In this paper .based on traditional MB-OFDM ultra-wide band physics level structure, we analyze coded multiple-input/multiple output (MIMO) systems with antenna selection at the transmitter side. Proposed an optimum selection criterion to minimize the bit error ratio (BER) and Improved the algorithm to reduce the computation quantity when a channel adapted space-time block coding (STBC) are used. The simulation result indicated that, the STBC-MB-OFDM system may obtain the better diversity gain under the low signal to noise ratio, and the system with antenna selection is reduced the bit error ratio (BER) and complexity in the revision S-V channel.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130594279","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401712
l.I. Jumanov, A. Akhatov, O. Djumanov
The architecture of uniform information space of Republic of Uzbekistan by a hierarchical principle on the basis distributed mobile IT systems is stated. For the information space of regional management which is formed as set of the distributed databases and knowledge, storehouses of the information, computing centers, managing systems, and also applied Internet-portals and systems for representation of modern e-services the task of providing of reliability of inputting, transfer and processing of the information of a various nature and format is put and solved at a level of the users of network services of an applied level (Applied, Presentation, Session levels of OSI model). The algorithms based on principles of statistical and dictionary coding are developed for the control of the information reliability at the expense of statistical redundancy. There are used the schemes of coding by methods of Huffman, Lempel-Ziv-Welch, transformation of Burrows-Wheeler and arithmetical coding.
{"title":"An effective quality control of textual information on the basis of statistical redundancy in distributed mobile IT systems and e-applications","authors":"l.I. Jumanov, A. Akhatov, O. Djumanov","doi":"10.1109/CANET.2007.4401712","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401712","url":null,"abstract":"The architecture of uniform information space of Republic of Uzbekistan by a hierarchical principle on the basis distributed mobile IT systems is stated. For the information space of regional management which is formed as set of the distributed databases and knowledge, storehouses of the information, computing centers, managing systems, and also applied Internet-portals and systems for representation of modern e-services the task of providing of reliability of inputting, transfer and processing of the information of a various nature and format is put and solved at a level of the users of network services of an applied level (Applied, Presentation, Session levels of OSI model). The algorithms based on principles of statistical and dictionary coding are developed for the control of the information reliability at the expense of statistical redundancy. There are used the schemes of coding by methods of Huffman, Lempel-Ziv-Welch, transformation of Burrows-Wheeler and arithmetical coding.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121345545","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401690
I. Gavrilov, A. Chernyshov, S. M. Ibraeva, J.F. Kabanova, A. Puziy, M. Suvorova
In article questions of TV video streams compression efficiency increasing by codecs on the basis of wavelet transformations, due to elimination of time redundancy by means of formation of an interframe difference are considered. Experimental results of compression of interframe image differences of various plots in relation to the keyframe are resulted.
{"title":"Interframe processing of TV images in wavelet codecs for cellular communication systems","authors":"I. Gavrilov, A. Chernyshov, S. M. Ibraeva, J.F. Kabanova, A. Puziy, M. Suvorova","doi":"10.1109/CANET.2007.4401690","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401690","url":null,"abstract":"In article questions of TV video streams compression efficiency increasing by codecs on the basis of wavelet transformations, due to elimination of time redundancy by means of formation of an interframe difference are considered. Experimental results of compression of interframe image differences of various plots in relation to the keyframe are resulted.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115221468","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401708
Chun-Liang Liu, Chung-Hsin Huang, C. Chiu
In this paper, an image based ray-tracing model is used to calculate the channel capacity for various materials of partitions in indoor ultra wideband (UWB) system with multiple input multiple output (MIMO). The material parameters of the partitions such as dielectric constant and conductivity are both dependent on operation frequency in our calculations for more precise results. The effects of various materials of partitions on 2times2 MIMO UWB system are simulated for different signal-to-noise ratio (SNR).
{"title":"Channel capacity for various materials of partitions in indoor ultra wideband communication system with multiple input multiple output","authors":"Chun-Liang Liu, Chung-Hsin Huang, C. Chiu","doi":"10.1109/CANET.2007.4401708","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401708","url":null,"abstract":"In this paper, an image based ray-tracing model is used to calculate the channel capacity for various materials of partitions in indoor ultra wideband (UWB) system with multiple input multiple output (MIMO). The material parameters of the partitions such as dielectric constant and conductivity are both dependent on operation frequency in our calculations for more precise results. The effects of various materials of partitions on 2times2 MIMO UWB system are simulated for different signal-to-noise ratio (SNR).","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128065642","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401719
K. Yadav, N. Singh, S. Maskara
The need for spectrally efficient transmission on wireless channels can be achieved by adaptive transmission in which channel prediction is an important tool to combat the harmful effects of fading. The study in this paper has been emphasized to investigate the channel prediction technique using pilot symbol assisted modulation (PSAM). This technique is implemented using modified long range prediction (MLRP) and estimation of signal parameters using rotation invariance technique (ESPRIT) algorithm. This paper compares PSAM, with other techniques and also put some results for Wireless LANs. A significant improvement in terms of mean square error, predictor order, predicted channel envelope and bit error rate has been achieved.
{"title":"Analysis of pilot symbol assisted modulation using modified long range prediction algorithm for rayleigh fading channel","authors":"K. Yadav, N. Singh, S. Maskara","doi":"10.1109/CANET.2007.4401719","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401719","url":null,"abstract":"The need for spectrally efficient transmission on wireless channels can be achieved by adaptive transmission in which channel prediction is an important tool to combat the harmful effects of fading. The study in this paper has been emphasized to investigate the channel prediction technique using pilot symbol assisted modulation (PSAM). This technique is implemented using modified long range prediction (MLRP) and estimation of signal parameters using rotation invariance technique (ESPRIT) algorithm. This paper compares PSAM, with other techniques and also put some results for Wireless LANs. A significant improvement in terms of mean square error, predictor order, predicted channel envelope and bit error rate has been achieved.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131208530","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401709
J. Azizov, O. Hidoev, J. Sangirov, D. Rahmatov
As global standards evolve on WPAN mobility, engineering design becomes more challenging for sensor nodes that form WPAN groups at random based on data sensing and acquisition (application) profiles. As sensor node platforms typically have computation blocks that can handle a minimal set of instructions (8 bit microcontrollers and less) and are greatly constrained (8KB static firmware footprint and 64KB RAM), the clear challenge in supporting multi-applications (and hence multi-radios) to enhance the sensor 's functionalities is the implementation of different radio and application profile stacks on the embedded system. The main design bottlenecks are system architecture optimization for multi-radio stacks, application-driven PHY/MAC emulation in the 8KB static firmware and of course, ensuring low power and high battery life. Our studies indicate that overcoming these embedded systems engineering bottlenecks in sensor node designs involves rethinking a few standards and raising the need to have new standards in the IETF LoWPAN WG. On this paper, we would like to show the need to introduce a new protocol in the LoWPAN WG derived from overcoming some of the sensor node design bottlenecks in seamless pervasive indoor environments.
{"title":"Impact of application-driven multi-radio emulation in embedded devices on IETF LoWPAN standards","authors":"J. Azizov, O. Hidoev, J. Sangirov, D. Rahmatov","doi":"10.1109/CANET.2007.4401709","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401709","url":null,"abstract":"As global standards evolve on WPAN mobility, engineering design becomes more challenging for sensor nodes that form WPAN groups at random based on data sensing and acquisition (application) profiles. As sensor node platforms typically have computation blocks that can handle a minimal set of instructions (8 bit microcontrollers and less) and are greatly constrained (8KB static firmware footprint and 64KB RAM), the clear challenge in supporting multi-applications (and hence multi-radios) to enhance the sensor 's functionalities is the implementation of different radio and application profile stacks on the embedded system. The main design bottlenecks are system architecture optimization for multi-radio stacks, application-driven PHY/MAC emulation in the 8KB static firmware and of course, ensuring low power and high battery life. Our studies indicate that overcoming these embedded systems engineering bottlenecks in sensor node designs involves rethinking a few standards and raising the need to have new standards in the IETF LoWPAN WG. On this paper, we would like to show the need to introduce a new protocol in the LoWPAN WG derived from overcoming some of the sensor node design bottlenecks in seamless pervasive indoor environments.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117090428","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401666
F. Yu, Yun Li, Fei Fang, Qianbin Chen
Energy aware routing protocol plays an important role in the performance of mobile ad hoc networks because mobile hosts in such networks are usually battery-operated. In this paper, based on TORA, we present an energy-aware routing protocol E-TORA. E-TORA selects routes according to hop count and residual energy of nodes. The nodes that have more energy have more probability chosen by E-TORA. Simulation results comparing with TORA in NS-2 show that E-TORA can balance effectively energy consumption of each node and increase evidently the lifetime of the network.
{"title":"A new TORA-based energy aware routing protocol in mobile ad hoc networks","authors":"F. Yu, Yun Li, Fei Fang, Qianbin Chen","doi":"10.1109/CANET.2007.4401666","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401666","url":null,"abstract":"Energy aware routing protocol plays an important role in the performance of mobile ad hoc networks because mobile hosts in such networks are usually battery-operated. In this paper, based on TORA, we present an energy-aware routing protocol E-TORA. E-TORA selects routes according to hop count and residual energy of nodes. The nodes that have more energy have more probability chosen by E-TORA. Simulation results comparing with TORA in NS-2 show that E-TORA can balance effectively energy consumption of each node and increase evidently the lifetime of the network.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121938324","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401686
M. T. Honary, J. Chitizadeh
Energy efficiency is a critical parameter in wireless sensor networks. Clustering the nodes and controlling the number of cluster heads and members provides an effective way of energy efficiency. In this paper, we develop a clustering protocol for single hop wireless sensor networks. We utilize a competition algorithm for cluster selection phase that the competition's range is a function of distance to base station. Our objective is to balance the energy consumption of the clusterheads all over the network. Simulation results show the more balanced energy consumption and longer lifetime. Moreover, the proposed scheme delivers more packets of data to the base station, which provides more accuracy of the monitored phenomenon.
{"title":"Lifetime prolonging of wireless sensor networks via a recursive clustering algorithm","authors":"M. T. Honary, J. Chitizadeh","doi":"10.1109/CANET.2007.4401686","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401686","url":null,"abstract":"Energy efficiency is a critical parameter in wireless sensor networks. Clustering the nodes and controlling the number of cluster heads and members provides an effective way of energy efficiency. In this paper, we develop a clustering protocol for single hop wireless sensor networks. We utilize a competition algorithm for cluster selection phase that the competition's range is a function of distance to base station. Our objective is to balance the energy consumption of the clusterheads all over the network. Simulation results show the more balanced energy consumption and longer lifetime. Moreover, the proposed scheme delivers more packets of data to the base station, which provides more accuracy of the monitored phenomenon.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121988448","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401683
M. R. Doomun, K. Soyjaudah, D. Bundhoo
Encryption, which is the backbone of security protocols, is computationally intensive and consumes energy and computational resources that are limited in wireless devices. This paper focuses on evaluating the performance of Rijndael-Advanced Encryption Standard (AES) encryption scheme in terms of energy consumed and execution time, and modeling the computational operations involved. The objective is to provide simulation results to help in the design and optimization of efficient cryptographic techniques. The computational model as a function of primitive operations shows a good estimate of encryption complexity, hence the energy consumption for encryption.
加密是安全协议的支柱，它是计算密集型的，并且消耗无线设备中有限的能源和计算资源。本文着重从能耗和执行时间两方面对Rijndael-Advanced Encryption Standard (AES)加密方案的性能进行了评价，并对所涉及的计算操作进行了建模。目的是提供仿真结果，以帮助设计和优化有效的加密技术。作为原始操作函数的计算模型显示了对加密复杂性的良好估计，从而减少了加密的能量消耗。
{"title":"Energy consumption and computational analysis of rijndael-AES","authors":"M. R. Doomun, K. Soyjaudah, D. Bundhoo","doi":"10.1109/CANET.2007.4401683","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401683","url":null,"abstract":"Encryption, which is the backbone of security protocols, is computationally intensive and consumes energy and computational resources that are limited in wireless devices. This paper focuses on evaluating the performance of Rijndael-Advanced Encryption Standard (AES) encryption scheme in terms of energy consumed and execution time, and modeling the computational operations involved. The objective is to provide simulation results to help in the design and optimization of efficient cryptographic techniques. The computational model as a function of primitive operations shows a good estimate of encryption complexity, hence the energy consumption for encryption.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131206450","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}
Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401697
A. Rasulov
The defect structures such as surface atomic steps and point defects have been studied by computer simulation of ion scattering and channelling processes. The energy and angular distributions of ions scattered and dechannelled from semi-infinite and isolated steps on the Cu(100) and GaP(100) surface as well as the characteristics of particles channelled through Cu(100) with point defect structures have been calculated. It was shown that the low energy ion scattering and channelling can be use successfully for analysis of defect structures in single crystals.
{"title":"Analysis of defect structures in single crystals by ion scattering and channelling","authors":"A. Rasulov","doi":"10.1109/CANET.2007.4401697","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401697","url":null,"abstract":"The defect structures such as surface atomic steps and point defects have been studied by computer simulation of ion scattering and channelling processes. The energy and angular distributions of ions scattered and dechannelled from semi-infinite and isolated steps on the Cu(100) and GaP(100) surface as well as the characteristics of particles channelled through Cu(100) with point defect structures have been calculated. It was shown that the low energy ion scattering and channelling can be use successfully for analysis of defect structures in single crystals.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131365949","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：