Pub Date : 2007-12-12DOI: 10.1109/CANET.2007.4401715
M. Akbari, M. Ahmadian, S. Salari
Repeat of preamble is a usual method for time and frequency synchronization in a large group of multicarrier systems. The essential drawback of this method is reduction of maximum estimated frequency offset range with increasing the length of preamble. Recently, Zhang et al. proposed a method for joint frame synchronization and carrier frequency offset estimation scheme in OFDM systems. To the best knowledge of the authors, no extend of this method for MIMO-OFDM systems have been presented in the literature yet. In this paper we propose a new extension of joint frame and frequency synchronization of MIMO-OFDM systems with the preamble we name it "Mirror preamble". Increase the maximum carrier frequency offset acquisition range up to one half of the total bandwidth of all subcarriers is a desire result obtained from mirror preamble. In this paper we have used Zero Correlation Zone (ZCZ) sequences in the proposed preamble structure and to the contrary of Zhang et al. that neglected the effects of dispersive multi-path channel in their analysis, we have a discussion about reduction of these effects in the methods based mirror preamble.
{"title":"Joint frame and frequency synchronization for MIMO OFDM systems with ZCZ sequences","authors":"M. Akbari, M. Ahmadian, S. Salari","doi":"10.1109/CANET.2007.4401715","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401715","url":null,"abstract":"Repeat of preamble is a usual method for time and frequency synchronization in a large group of multicarrier systems. The essential drawback of this method is reduction of maximum estimated frequency offset range with increasing the length of preamble. Recently, Zhang et al. proposed a method for joint frame synchronization and carrier frequency offset estimation scheme in OFDM systems. To the best knowledge of the authors, no extend of this method for MIMO-OFDM systems have been presented in the literature yet. In this paper we propose a new extension of joint frame and frequency synchronization of MIMO-OFDM systems with the preamble we name it \"Mirror preamble\". Increase the maximum carrier frequency offset acquisition range up to one half of the total bandwidth of all subcarriers is a desire result obtained from mirror preamble. In this paper we have used Zero Correlation Zone (ZCZ) sequences in the proposed preamble structure and to the contrary of Zhang et al. that neglected the effects of dispersive multi-path channel in their analysis, we have a discussion about reduction of these effects in the methods based mirror preamble.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"33 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":"114862181","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.2007.4401702
S. A. Sadchikova, Aleksey V. Son, V. M. Son
This paper introduces model of associative switching network, based on binary relations of associative calculus, group theory and finite state automaton. This paper describes architecture of switching element of broadband associative switching network. The structural relations are based on group theory and associative calculus. Application of group theory permits to describe switching elements as finite automaton, which executes procedures of switching and route selection on hardware logic level. So, switching elements can be implemented on the optical and optoelectronic basis.
{"title":"Model of broadband associative switching network","authors":"S. A. Sadchikova, Aleksey V. Son, V. M. Son","doi":"10.1109/CANET.2007.4401702","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401702","url":null,"abstract":"This paper introduces model of associative switching network, based on binary relations of associative calculus, group theory and finite state automaton. This paper describes architecture of switching element of broadband associative switching network. The structural relations are based on group theory and associative calculus. Application of group theory permits to describe switching elements as finite automaton, which executes procedures of switching and route selection on hardware logic level. So, switching elements can be implemented on the optical and optoelectronic basis.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"82 6 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":"129959696","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.2007.4401665
A. Markhasin, A. Kolpakov, V. Drozdova
Abstract -In this paper, we present optimization tasks of the spectral and power efficiency of the m-ary channels' in wireless and mobile networks. The invariant efficiency criterions based on the m-ary digital channel's Shannon capacity are introduced. Two invariant fundamental resources efficiency optimums are investigated: first - the maximum spectral efficiency in bit-per-second-per-Hertz, and seconds -the minimum specific power consumption in SNR-per-bit-per-second-per-Hertz. These criterions were constructed based on invariant parameters. The fact that the value of invariant function F(x1, x2...) does not change by substitution instead of every x1 argument's his x1* (x1, x2,...) invariant maps may be suitable for universal appropriateness research both information measures and power measures.
{"title":"Optimization of the spectral and power efficiency of m-ary channels in wireless and mobile systems","authors":"A. Markhasin, A. Kolpakov, V. Drozdova","doi":"10.1109/CANET.2007.4401665","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401665","url":null,"abstract":"Abstract -In this paper, we present optimization tasks of the spectral and power efficiency of the m-ary channels' in wireless and mobile networks. The invariant efficiency criterions based on the m-ary digital channel's Shannon capacity are introduced. Two invariant fundamental resources efficiency optimums are investigated: first - the maximum spectral efficiency in bit-per-second-per-Hertz, and seconds -the minimum specific power consumption in SNR-per-bit-per-second-per-Hertz. These criterions were constructed based on invariant parameters. The fact that the value of invariant function F(x1, x2...) does not change by substitution instead of every x1 argument's his x1* (x1, x2,...) invariant maps may be suitable for universal appropriateness research both information measures and power measures.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"46 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":"123796946","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.2007.4401678
N. Mahamatov, Jongsu Lee, Min-Kyu Lee
This paper aims at presenting an analysis of the telecommunication services diffusion process in Commonwealth of Independent States (CIS). Also to investigate diffusion dynamics and to analyze complementarity and competition trends among technologies. To identify the most important factors associated with Telecommunication services diffusion, determinants and their influences in the diffusion among the CIS countries. The Telecommunication services in this analysis include: Internet, mobile cellular phone and fixed telephone services. Present study assigns Internet service as well as fixed telephone and mobile phone service to the category of telecommunications services by incorporating the effects of the Internet in the telecommunications service market. In this paper we apply modified diffusion models to telecommunication growth in CIS countries. Empirical analysis presents - telecommunication services in CIS are mostly complementary to each other. Analyses of estimation results and factors associated with ICT diffusion dynamism can play significant role to provide policy recommendations for these countries and for other developing countries to achieve the desired pervasiveness of the information communication technologies.
{"title":"Telecommunication services diffusion in cis: dynamics of competition and complementarity among telecommunication services","authors":"N. Mahamatov, Jongsu Lee, Min-Kyu Lee","doi":"10.1109/CANET.2007.4401678","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401678","url":null,"abstract":"This paper aims at presenting an analysis of the telecommunication services diffusion process in Commonwealth of Independent States (CIS). Also to investigate diffusion dynamics and to analyze complementarity and competition trends among technologies. To identify the most important factors associated with Telecommunication services diffusion, determinants and their influences in the diffusion among the CIS countries. The Telecommunication services in this analysis include: Internet, mobile cellular phone and fixed telephone services. Present study assigns Internet service as well as fixed telephone and mobile phone service to the category of telecommunications services by incorporating the effects of the Internet in the telecommunications service market. In this paper we apply modified diffusion models to telecommunication growth in CIS countries. Empirical analysis presents - telecommunication services in CIS are mostly complementary to each other. Analyses of estimation results and factors associated with ICT diffusion dynamism can play significant role to provide policy recommendations for these countries and for other developing countries to achieve the desired pervasiveness of the information communication technologies.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"35 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":"122999525","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.2007.4401681
M. Shafik, H.M. El Badawy, G. Selim
Nowadays, WiMAX has become one of the candidate networks in order to achieve high speed Internet via wireless access systems .In this paper, the broadband wireless access system provided by IEEE802.16 and its modification for mobile customers IEEE802.16e will be addressed .Exclusively the downlink data transmission will be considered .the system performance will be tested in different operating environment. Rayleigh fading channel, channel estimation and equalization are considered also partial and full usage of subcarriers will be investigated with the support of cyclic prefix implementation. In addition the proposed simulation model has been tested using a Stanford channel model.
{"title":"Simulation and assessment of WiMAX network performance in different environments","authors":"M. Shafik, H.M. El Badawy, G. Selim","doi":"10.1109/CANET.2007.4401681","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401681","url":null,"abstract":"Nowadays, WiMAX has become one of the candidate networks in order to achieve high speed Internet via wireless access systems .In this paper, the broadband wireless access system provided by IEEE802.16 and its modification for mobile customers IEEE802.16e will be addressed .Exclusively the downlink data transmission will be considered .the system performance will be tested in different operating environment. Rayleigh fading channel, channel estimation and equalization are considered also partial and full usage of subcarriers will be investigated with the support of cyclic prefix implementation. In addition the proposed simulation model has been tested using a Stanford channel model.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"87 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":"116763773","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 : 2007-12-04DOI: 10.1109/ISCIT.2007.4391991
Gang Yang, Zhengjie Yang
A new tone reservation (TR) scheme for the peak-to-average power ratio (PAPR) reduction in the orthogonal frequency division multiplexing (OFDM) system is proposed. Different from the conventional TR scheme, the cancellation signals are generated by using FFT/IFFT iteration. Simulation results show that the new TR scheme based on FFT/IFFT has a perfect PAPR reduction performance and the number of iteration is significantly reduced.
{"title":"PAPR reduction in the OFDM system employing tone reservation based on FFT/IFFT","authors":"Gang Yang, Zhengjie Yang","doi":"10.1109/ISCIT.2007.4391991","DOIUrl":"https://doi.org/10.1109/ISCIT.2007.4391991","url":null,"abstract":"A new tone reservation (TR) scheme for the peak-to-average power ratio (PAPR) reduction in the orthogonal frequency division multiplexing (OFDM) system is proposed. Different from the conventional TR scheme, the cancellation signals are generated by using FFT/IFFT iteration. Simulation results show that the new TR scheme based on FFT/IFFT has a perfect PAPR reduction performance and the number of iteration is significantly reduced.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114211295","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 : 2007-09-01DOI: 10.1109/CANET.2007.4401680
H. Nigmatov, D. Abdukadirov, D. Abdukadirova, D. Shaykhutdinova, F. Rakhimova
In the given report the server by the account technical -economic parameters of objects-consumers of the information is considered questions of development of a uniform technique of maintenance of information safety in networks of telecommunication.
{"title":"To a technique of optimization of information safety in networks and systems of telecommunication","authors":"H. Nigmatov, D. Abdukadirov, D. Abdukadirova, D. Shaykhutdinova, F. Rakhimova","doi":"10.1109/CANET.2007.4401680","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401680","url":null,"abstract":"In the given report the server by the account technical -economic parameters of objects-consumers of the information is considered questions of development of a uniform technique of maintenance of information safety in networks of telecommunication.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127890419","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 : 2007-09-01DOI: 10.1109/CANET.2007.4401699
N. Yunusov, R.K. Atametov, S. Yuldasheva
The quantity ratio simulating the characteristics of a photodiode and photo receiving device on the field-effect transistor with p-n controlling junction as a current amplifier as a power function of input optical radiation is presented in the work.
{"title":"Mathematical model of a photodiode and photo receiving device on the field-effect transistor with p-n controlling junction as a current amplifier","authors":"N. Yunusov, R.K. Atametov, S. Yuldasheva","doi":"10.1109/CANET.2007.4401699","DOIUrl":"https://doi.org/10.1109/CANET.2007.4401699","url":null,"abstract":"The quantity ratio simulating the characteristics of a photodiode and photo receiving device on the field-effect transistor with p-n controlling junction as a current amplifier as a power function of input optical radiation is presented in the work.","PeriodicalId":413993,"journal":{"name":"2007 3rd IEEE/IFIP International Conference in Central Asia on Internet","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125219269","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}
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