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An incremental redundancy short length LDPC codes based on random construction techniques 一种基于随机构造技术的增量冗余短长度LDPC码
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478640
Shereen A. M. Baghdady, Y. Fahmy, M. El-Soudani
{"title":"An incremental redundancy short length LDPC codes based on random construction techniques","authors":"Shereen A. M. Baghdady, Y. Fahmy, M. El-Soudani","doi":"10.1109/ICTEL.2010.5478640","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478640","url":null,"abstract":"In this paper, a powerful class of irregular low-density parity check (LDPC) codes based on random construction techniques is presented. The resultant codes have accurate profile with the additional features of making them suitable for incremental redundancy systems. The proposed codes also have low encoding complexity and can be decoded efficiently. Moreover, these codes show better puncturing performance than irregular LDPC codes obtained by other techniques over a wide range of code rates (0.6~0.9) and become more distinctive at higher rates.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126332545","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
Electromagnetic field representation in the radiating near field region of Bases Transceiver Station antennas 基地收发站天线辐射近场区域的电磁场表示
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478796
D. Trinchero, R. Stefanelli
{"title":"Electromagnetic field representation in the radiating near field region of Bases Transceiver Station antennas","authors":"D. Trinchero, R. Stefanelli","doi":"10.1109/ICTEL.2010.5478796","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478796","url":null,"abstract":"This paper analyses the limitations of the standard methods normally applied to predict the field radiated in the radiating near field region of BTS antennas. Performances are compared to the ones obtainable by a Fraunhofer-based method that has been recently proposed. Comparisons to experimental results show that the new method can be very efficient, as it guarantees the overestimation of the electromagnetic field, without excessive redundancy.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125904881","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
Power control for time-varying cognitive radio networks 时变认知无线电网络的功率控制
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478649
Ruifeng Duan, M. Elmusrati, R. Jäntti, R. Virrankoski
{"title":"Power control for time-varying cognitive radio networks","authors":"Ruifeng Duan, M. Elmusrati, R. Jäntti, R. Virrankoski","doi":"10.1109/ICTEL.2010.5478649","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478649","url":null,"abstract":"In this paper we propose a new power control scheme for cognitive radios, Distributed Power Control Algorithm for Cognitive Radios (DPCACR). As we know that in a cognitive system, the secondary users (SU) either transmit in an opportunistic way or coexist with the primary users to transmit simultaneously under the constraints that will not harm to the primary users. Previously, the interference temperature was announced to limit the transmit power of SUs. However, in 2007 the FCC has abandoned the concept which is not workable. In this paper, we consider the elastic transmission scenario for secondary system. The cognitive networks using code-division multiple access (CDMA) technology to transmit simultaneously with primary users in the same spectral band.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122233935","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
Algerian V-Learning network 阿尔及利亚V-Learning网络
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478788
F. Khenak
{"title":"Algerian V-Learning network","authors":"F. Khenak","doi":"10.1109/ICTEL.2010.5478788","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478788","url":null,"abstract":"Very early, we had the intuition that the E-Learning, developed by and for societies ‘in written tradition’, was not going to acquire the expected success in societies ‘in oral tradition’, like most part of the African societies among which Algeria, where the orality occupies a predominant place in the transmission of knowledge. To communicate orally, the majority of the Algerians ingeniously combine several languages, but they seriously do not master the writing of any of these. Is this a wealth or a linguistic anarchy? To elude this question, we concentrated our cogitation on the elaboration of a technical, scientific and economic V-Learning model, inserting this tradition. So, we recently deployed a national Video Education Network (or, REV in French) which we are going to introduce here.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115246941","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
Distributed cooperative location estimation (D-COOLEST) in wireless environments 无线环境下的分布式协同定位估计
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478763
Yi Ouyang, Pang-Chang Lan, Sheng-Yi Ho, Yao-Cheng Tien, Tzu-Wei Lo, Ping-Cheng Yeh
{"title":"Distributed cooperative location estimation (D-COOLEST) in wireless environments","authors":"Yi Ouyang, Pang-Chang Lan, Sheng-Yi Ho, Yao-Cheng Tien, Tzu-Wei Lo, Ping-Cheng Yeh","doi":"10.1109/ICTEL.2010.5478763","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478763","url":null,"abstract":"In probabilistic location estimation, Kalman filters, particle filters, and hidden Markov model (HMM) schemes are commonly used. Among those, HMM-based algorithms have the best performance. However, there is still room for improvement. In this paper, we propose two distributed cooperative location estimation algorithms, D-COOLEST1 and D-COOLEST2, for HMM-based location estimation. The users are designed to exchange their observations and estimation results with each other after random encounters which allows them to further improve the accuracy of their location estimation. To the best of our knowledge, this is the first work in the literature to propose the theoretical framework for user cooperation in probabilistic location estimation. Simulation results show that the proposed algorithms can significantly improve the estimation accuracy and reduce the normalized mean squared error (MSE).","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123162043","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
New results on turbulence modeling for free-space optical systems 自由空间光学系统湍流建模的新结果
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478872
N. Chatzidiamantis, H. Sandalidis, G. Karagiannidis, S. Kotsopoulos, M. Matthaiou
{"title":"New results on turbulence modeling for free-space optical systems","authors":"N. Chatzidiamantis, H. Sandalidis, G. Karagiannidis, S. Kotsopoulos, M. Matthaiou","doi":"10.1109/ICTEL.2010.5478872","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478872","url":null,"abstract":"In this paper, we propose a statistical channel model, named as Double-Weibull, to describe the irradiance fluctuations in moderate and strong turbulence for free-space optical (FSO) systems. The proposed stochastic model is based on the scintillation theory and derived via the product of two Weibull random variables. Closed-form expressions of probability and cumulative density functions are provided in terms of Meijer's G-function. We also compare the new model with the classical gamma-gamma model and assess their accuracy via a set of simulations when both plane and spherical waves are considered. We finally evaluate the performance of an FSO system over the Double-Weibull turbulence channel and derive closed-form expressions for the bit-error rate, assuming intensity-modulation/direct detection with On-Off keying, and the outage probability.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121065211","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: 57
A high gain active photonic antenna for high speed backhaul link: A system analysis 用于高速回程链路的高增益有源光子天线:系统分析
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478795
T. Prakoso, R. Ngah, T. A. Rahman, Zabih Ghassemlooy
{"title":"A high gain active photonic antenna for high speed backhaul link: A system analysis","authors":"T. Prakoso, R. Ngah, T. A. Rahman, Zabih Ghassemlooy","doi":"10.1109/ICTEL.2010.5478795","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478795","url":null,"abstract":"A high-gain active photonic antenna is proposed to provide long distance optical and wireless backhaul link. To support service for long wireless distance, RF amplifier and high gain antenna is integrated to the photonic antenna concept. High speed feature is achieved through utilization of simultaneous multi-channel WLAN transmitted through the photonic antenna. Using this notion, the use of four simultaneous channels can potentially provide 216 Mbps at 5 km and 120 Mbps at 7.7 km. Utilization of two simultaneous channels is potentially capable of supporting 108 Mbps at 13.4 km and 72 Mbps at 16.3 km. The speed can be increased if modified WLAN protocol, such as Nstreme2, is employed. These results are significantly higher speed compared to current common practice. This study also remarks that the downlink side is the performance limiter of the photonic antenna system, therefore become the priority to be optimized. Cognitive radio can be adopted to improve the optical link bandwidth utilization and increase aggregate data rate.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126450785","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
Performance analysis of reuse partitioning techniques in OFDMA based cellular radio networks 基于OFDMA的蜂窝无线网络中复用分区技术的性能分析
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478753
Zheng Xie, B. Walke
{"title":"Performance analysis of reuse partitioning techniques in OFDMA based cellular radio networks","authors":"Zheng Xie, B. Walke","doi":"10.1109/ICTEL.2010.5478753","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478753","url":null,"abstract":"Reuse partitioning is a useful method for mitigating co-channel interference (CCI) in orthogonal frequency division multiple access (OFDMA) based cellular environments. In this work, theoretical analysis of a series of reuse partitioning approaches is carried out, which contains the well-known Soft Frequency Reuse (SFR) scheme, the novel Enhanced Fractional Frequency Reuse (EFFR) scheme and two EFFR-derivatives, namely the EFFR-Advanced scheme and the EFFR-Beyond scheme. Based on the Carrier to Interference plus Noise Ratio (CINR) computation, we give the maximal cell radius and reasonable boundary definitions for division different user-type zones by using each of these reuse partitioning schemes. Through numerical evaluations, cell coverage and mean cell capacity of these schemes under two different propagation conditions are exhibited. The results show that the EFFR series can outperform the SFR and the conventional reuse schemes under any propagation mode. Furthermore, among all EFFR schemes, the EFFR-Advanced scheme with an adequate resource allocation may be the best solution for CCI mitigation, which can achieve not only the 100% cell coverage but also significant cell capacity enhancement.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114814250","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: 17
A delay-sensitive strategy for real-time monitoring in wireless sensor networks 无线传感器网络实时监控的延迟敏感策略
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478819
João B. Borges Neto, P. Neto, R. Andrade
{"title":"A delay-sensitive strategy for real-time monitoring in wireless sensor networks","authors":"João B. Borges Neto, P. Neto, R. Andrade","doi":"10.1109/ICTEL.2010.5478819","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478819","url":null,"abstract":"Advances in the research of Wireless Sensor Networks (WSN) have allowed their use for several purposes, including monitoring of critical and dangerous environments. Applications in these environments share the need of operation without human intervention, which imposes autonomy and efficiency in executing their tasks, even under critical environmental conditions. Besides the traditional WSN physical limitations, their utilization as a source of collecting data in challenging environments requires the ability to support real-time observations of the monitoring environment. These observations should consider not only environment unpredictability with respect to mobility but also the variable amount of nodes and collected data. To deal with that, in this paper we propose a delay-sensitive strategy, which aims to enable WSN for monitoring challenging environments, taking into account real-time data constraints as well as mobility and limitations of the sensor nodes. This strategy is implemented in a new routing protocol, called PROST.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131068207","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
Upper and lower bounds of burst loss probability for a core node in an Optical Burst Switched network with Pareto distributed arrivals Pareto分布到达光突发交换网络中核心节点突发损失概率的上界和下界
2010 17th International Conference on Telecommunications Pub Date : 2010-04-04 DOI: 10.1109/ICTEL.2010.5478867
M. Morsy, Mohammed Y. S. Sowailem, H. Shalaby
{"title":"Upper and lower bounds of burst loss probability for a core node in an Optical Burst Switched network with Pareto distributed arrivals","authors":"M. Morsy, Mohammed Y. S. Sowailem, H. Shalaby","doi":"10.1109/ICTEL.2010.5478867","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478867","url":null,"abstract":"A mathematical model is introduced for performance evaluation of an OBS core node employing either no or full wavelength conversion strategies. Furthermore, the model assumes long-range dependent (LRD) traffic arrivals to the OBS intermediate node which are accurately modeled by Pareto distribution. In our proposed model, each output port is imitated by a GI/M/w/w queue for which a single performance measure; namely the burst loss probability, is evaluated from the model equations. Also, results of this model are compared with those obtained while assuming short-range dependent (SRD) Poisson arrivals to the core node in the two cases of no and full wavelength conversion. Finally, results show that traditional Poisson traffic models yields over-optimistic performance measures in terms of lower burst loss probability when compared to the more accurate long-range dependent Pareto traffic model. This discrepancy between the two models is much clearer for light traffic scenarios due to the more significant impact of self-similarity.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128127474","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
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