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2008 International Symposium on Telecommunications最新文献

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Energy efficient localization in wireless ad-hoc sensor networks using probabilistic neural network and Independent Component Analysis 基于概率神经网络和独立分量分析的无线自组织传感器网络能量高效定位
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651329
S. Rajaee, S. Almodarresi, M. Sadeghi, M. Aghabozorgi
{"title":"Energy efficient localization in wireless ad-hoc sensor networks using probabilistic neural network and Independent Component Analysis","authors":"S. Rajaee, S. Almodarresi, M. Sadeghi, M. Aghabozorgi","doi":"10.1109/ISTEL.2008.4651329","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651329","url":null,"abstract":"Recently, wireless ad-hoc sensor networks due to their abilities are being rapidly developed to collect data across the area of deployment. To describe the collected data and facilitate communication protocols, it is necessary to identify the location of each sensor. Usually, localization algorithms use trilateration or multilateration based on range measurements obtained from RSSI, TOA, TDOA and AoA. This paper addresses localization techniques in ad-hoc wireless networks, where anchors and unknown nodes are randomly positioned in a uniform distribution in a squared area. Here , we first review some existing sensor localization methods and then propose a localization method that with use of probabilistic neural network (PNN), estimates the locations of unknown nodes, Then we reduce calculations and energy consumption with the help of independent component analysis (ICA) by removing some unnecessary anchor nodes. A PNN can estimate the location of unknown nodes, properly and with the help of ICA we can easily reduce calculations and therefore energy consumption by about 43 percent in dense networks.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115464584","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: 16
Cyclostationarity-based cooperative spectrum sensing for cognitive radio networks 基于循环平稳的认知无线电网络协同频谱感知
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651341
H. Sadeghi, P. Azmi
{"title":"Cyclostationarity-based cooperative spectrum sensing for cognitive radio networks","authors":"H. Sadeghi, P. Azmi","doi":"10.1109/ISTEL.2008.4651341","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651341","url":null,"abstract":"In order to ensure trustworthy coexistence of unlicensed cognitive radio (CR) networks with licensed primary networks, CR spectrum sensing function must be able to detect licensed users even at very low SNR values. But, non-cooperative spectrum sensing methods are not so reliable and result in a low probability of detection. In this paper, we propose some cooperative detection schemes in order to improve the spectrum sensing performance in the CR networks. Because cyclostationary detectors can differentiate between modulated signals, interference, and noise even in low SNRs; in the proposed method a powerful multi-cycle detector is employed. Results of the simulations show that cooperative sensing based on multi-cycle detection outperforms conventional methods even in low SNR conditions.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117295846","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: 29
Solving occlusion problem in 3D human motion reconstruction 解决三维人体运动重建中的遮挡问题
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651391
N. Roudsarabi, A. Behrad
{"title":"Solving occlusion problem in 3D human motion reconstruction","authors":"N. Roudsarabi, A. Behrad","doi":"10.1109/ISTEL.2008.4651391","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651391","url":null,"abstract":"One of the important problems in human motion analysis is the 3D reconstruction of human motion, which utilizes the anatomic pointpsilas positions. These points can uniquely define the position and orientation of all anatomical segments. In the proposed algorithm, joint tracking is performed based on a n*n block of DCTs coefficient (descriptor matrix). Then we correct the false tracked joint such as occluded joint using an energy function which can estimate false joints using the length of limbs and other joint location. We divided the problem into two parts: 1) Torso correction; 2) Hand and Leg correction. It leads to correct location of all joints even when the occlusion occurs for a part of time. Finally, 3D reconstruction is performed using Taylor method. Algorithm is robust in human turning and temporal occluded limbs. Experimental results showed the promise of the algorithm.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117303119","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
Low complexity MMSE based channel estimation algorithm for the IEEE802.16d WMAN standard 基于低复杂度MMSE的IEEE802.16d WMAN信道估计算法
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651310
M. Hosseinnezhad, A. Salahi
{"title":"Low complexity MMSE based channel estimation algorithm for the IEEE802.16d WMAN standard","authors":"M. Hosseinnezhad, A. Salahi","doi":"10.1109/ISTEL.2008.4651310","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651310","url":null,"abstract":"This paper studies the effect of channel estimation in WiMAX system. The channel estimation is based on the principle of pilot-symbol-aided channel estimation (PACE) in frequency domain. The algorithms used here are based on the least squares (LS) and the minimum mean squares error (MMSE) approaches. Furthermore we propose a simple method to reduce the computation complexity of MMSE algorithm significantly which has a desirable performance. In the end, our result will quantitatively demonstrate the effect of LS, MMSE and proposed low complexity MMSE algorithms for uncoded IEEE802.16d standard of WiMAX system.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"48 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116311410","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 novel QCA multiplexer design 一种新颖的QCA多路复用器设计
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651389
S. Hashemi, M. Azghadi, A. Zakerolhosseini
{"title":"A novel QCA multiplexer design","authors":"S. Hashemi, M. Azghadi, A. Zakerolhosseini","doi":"10.1109/ISTEL.2008.4651389","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651389","url":null,"abstract":"Quantum-dot Cellular Automata is a novel nanotechnology that promises extra low-power, extremely dense and high speed structure for construction of logical circuits at a nano-scale. Moreover, multiplexer is a useful component for the design of many important circuits. This paper proposes a novel and efficient design of 2:1 multiplexer in the QCA. The proposed multiplexer has been compared to few recent designs in terms of area, speed and complexity. Comparison of results illustrates significant improvements in our design as compared to traditional approaches. Also, simulation proves that the proposed multiplexer design is completely robust and more sustainable to high input frequency, as compared to other designs. Simulations have been carried out using the QCA Designer, a layout and simulation tool for QCA.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123689044","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: 64
Incremental redundancy cooperative coding using complementary punctured convolutional codes with receive diversity in Nakagami fading environments Nakagami衰落环境下具有接收分集的互补穿孔卷积码增量冗余协同编码
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651402
Mahmood Mohassel Feghhi, B. Abolhassani
{"title":"Incremental redundancy cooperative coding using complementary punctured convolutional codes with receive diversity in Nakagami fading environments","authors":"Mahmood Mohassel Feghhi, B. Abolhassani","doi":"10.1109/ISTEL.2008.4651402","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651402","url":null,"abstract":"Cooperative communication has been recently paid much attention as an efficient way to combat the channel impairments by providing diversity. Incremental redundancy cooperative coding (IRCC) is a kind of cooperative diversity technique that avoids repetition coding. In this paper, we study bit error rate (BER) and block error rate (BLER) performance of IRCC using complementary punctured convolutional (CPC) codes in Nakagami fading channels. We consider effects of interuser channel quality and correlation among uplink channels on the system performance. We also investigate the performance of the aforementioned system using multiple antennas in the receiver. Simulation results show that using IRCC results in 7 dB improvement in case of having one antenna in the receiver at BER of 3times10-4.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121909937","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
Hardware implementation of a 802.11n MIMO OFDM transceiver 802.11n MIMO OFDM收发器的硬件实现
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651338
Z. Pajouhi, S. M. Fakhraie, S. Jamali
{"title":"Hardware implementation of a 802.11n MIMO OFDM transceiver","authors":"Z. Pajouhi, S. M. Fakhraie, S. Jamali","doi":"10.1109/ISTEL.2008.4651338","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651338","url":null,"abstract":"Wireless communication systems have become more and more widespread in the recent years. One of the most important standards is the Wireless LAN standard. This standard has three different amendments a, b and g. The next Wireless LAN standard which is not finalized yet is the 802.11n standard. The new standard is predicted to be capable of supporting data rates up to 600 Mbps thanks to deploying the new communication method ldquoMIMOrdquo. However, the data rate can only be achieved if it is efficiently realized in real hardware design. In this paper a 802.11n transceiver is designed and simulated. First, a high level Simulink model based on current draft of the standard is designed and tested. Design alternatives for mapper, viterbi decoder and MIMO equalizer are investigated towards an optimum design. Next, a fixed-point model is obtained and simulated. Optimizations have lead to higher power and area efficiency. Finally a FPGA-based design is proposed according to the results gained in the previous sections.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116913395","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: 22
Reduction of sensor population in a camera sensor network 摄像机传感器网络中传感器数量的减少
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651326
Maziar Sanjabi, S. Samavi, M. Ashori, N. Karimi, M. Fotohi, K. Kasiri
{"title":"Reduction of sensor population in a camera sensor network","authors":"Maziar Sanjabi, S. Samavi, M. Ashori, N. Karimi, M. Fotohi, K. Kasiri","doi":"10.1109/ISTEL.2008.4651326","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651326","url":null,"abstract":"The problem of surveillance for intrusion detection in a camera sensor network is addressed in this paper. In order to save limited resources, a sensing task should involve just the right number of sensors. For a wide enough coverage area random and uniform distribution can be applied. We propose a novel method which allows reduction of number of sensors and guarantees a desired surveillance against aerial intrusion. Enhancement of the method is also offered to further reduce the number of sensors and improve the performance.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127279297","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
Geographic routing in presence of the loss in wireless sensor networks 地理路由在无线传感器网络中存在损耗
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651328
E. Ghadimi, N. Yazdani, A.A. Safilian
{"title":"Geographic routing in presence of the loss in wireless sensor networks","authors":"E. Ghadimi, N. Yazdani, A.A. Safilian","doi":"10.1109/ISTEL.2008.4651328","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651328","url":null,"abstract":"Wireless sensor networks which are consisted of limited sensing, processing and communication equipments have prominent role in nowadays real-life applications. Efficient robust routing is a key feature in information processing in wireless sensor networks, especially in the presence of high-loss regions which occur due to harsh environment, hardware or software faults. In this paper, we propose a novel routing algorithm for high loss regions which have message loss above a given threshold. We solve theoretically the problem of near-optimal routing in a weighted region. Furthermore, Simulation experiments confirm the validity of proposed algorithm with high degree of accuracy.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"05 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130197501","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
Adaptive routing protocols for vehicular ad hoc networks 车辆自组织网络的自适应路由协议
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651414
M. Azarmi, M. Sabaei, H. Pedram
{"title":"Adaptive routing protocols for vehicular ad hoc networks","authors":"M. Azarmi, M. Sabaei, H. Pedram","doi":"10.1109/ISTEL.2008.4651414","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651414","url":null,"abstract":"Vehicular ad hoc networks based on IEEE 802.11(WLAN) technology are emerging technologies for future Intelligent Transportation Systems (ITS). We investigate the behavior of routing protocols in vehicular networks by using microscopic mobility information based on the real road maps. The simulation results show the remarkable effect of the real mobility models on the performance of routing protocols. We observe a significant reduction in packet delivery ratio in traditional and even position based routing protocols. To address these performance limitations in vehicular networks, we propose several improvements and take into account special characteristics of vehicular networks. The major improvement is the use of link expiration time (LET) as a node mobility and density indicator to provide transmission range adaptation. We proposed two adaptive routing protocols for vehicular ad hoc networks and evaluated through simulation.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130749080","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: 19
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