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2008 International Symposium on Telecommunications最新文献

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Cooperative mobile positioning based on Received Signal Strength 基于接收信号强度的协同移动定位
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1587/TRANSCOM.E92.B.1912
R. Saadat, Ahmad Shafiei, A. Tadaion
{"title":"Cooperative mobile positioning based on Received Signal Strength","authors":"R. Saadat, Ahmad Shafiei, A. Tadaion","doi":"10.1587/TRANSCOM.E92.B.1912","DOIUrl":"https://doi.org/10.1587/TRANSCOM.E92.B.1912","url":null,"abstract":"Among different techniques that provide mobile positioning, using the Received Signal Strength (RSS) is regarded as a low-cost solution which is applicable in a wide range of wireless networks. In this paper, we propose a cooperative RSS-based positioning algorithm that utilizes the additional RSS data of the short range communications between mobile stations (MSpsilas). We use a nonlinear least square optimization approach, to estimate the location of the adjacent mobile stations. Simulation results indicate that cooperation between mobile stations enhances the location accuracy of the RSS-based positioning algorithms.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"81 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":"126234514","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: 6
Speech enhancement using hybrid Generalized Sidelobe Canceller and spectral estimator 混合广义旁瓣对消和频谱估计的语音增强
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651365
H. R. Abutalebi, B. Dashtbozorg, T. Zare
{"title":"Speech enhancement using hybrid Generalized Sidelobe Canceller and spectral estimator","authors":"H. R. Abutalebi, B. Dashtbozorg, T. Zare","doi":"10.1109/ISTEL.2008.4651365","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651365","url":null,"abstract":"This paper proposes a new robust adaptive beamformer applicable to microphone arrays. The proposed beamformer is a Generalized Sidelobe Canceller (GSC) with a single-channel noise reduction stage. The single-channel stage can be either Optimally Modified Log-Spectral Amplitude (OMLSA) estimator or Adaptive Minimum Mean-Square (AMMSE) spectral amplitude estimator. These hybrid structures, named GSC-OMLSA/ GSC-AMMSE, improve noise reduction of the GSC beamformer in highly additive noisy environments where GSC alone fails to work properly. The proposed algorithms are evaluated through both subjective and objective measures like segmental SNR and log-likelihood ratio distance. The results demonstrate that GSC-OMLSA and GSC-AMMSE algorithm performs significantly better compare to GSC.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"18 6 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":"125731693","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
Time reversal technique for ultra wideband (TR-UWB) communication systems and its performance analysis 超宽带(TR-UWB)通信系统时间反转技术及其性能分析
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651303
D. Abbasi-Moghadam, V. Vakili
{"title":"Time reversal technique for ultra wideband (TR-UWB) communication systems and its performance analysis","authors":"D. Abbasi-Moghadam, V. Vakili","doi":"10.1109/ISTEL.2008.4651303","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651303","url":null,"abstract":"The impulsive UWB pulses require extremely high sampling rates as well as accurate timing synchronization. Such coherent transceivers as RAKE are too complicated for current applications. The low complexity receiver provides the first commercially feasible solution to a broad class of low-data-rate applications. One approach is time reversed UWB communication as an alternative to coherent reception. In this paper spatial and temporal focusing of time reversal based on experimental and simulation results are shown. It is seen that TR-UWB improves the signal-to-noise ratio (SNR) and reduces the intersymbol interference (ISI). Finally SISO & MISO TR-UWB performance for optimum receiver is analyzed and simulated. Comparisons of analytical and experimental results show that the performances are approximately the same.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"59 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":"126605691","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
Optimum design of Viterbi decoder for high speed data telecommunication receivers with 802.16a case study 基于802.16a的高速数据通信接收机Viterbi解码器优化设计
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651308
E. Rohani, S. M. Fakhraie
{"title":"Optimum design of Viterbi decoder for high speed data telecommunication receivers with 802.16a case study","authors":"E. Rohani, S. M. Fakhraie","doi":"10.1109/ISTEL.2008.4651308","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651308","url":null,"abstract":"In this paper, we present a floating-point model for OFDM part of the IEEE 802.16a standard. This part has been assigned as the mandatory structure for WiMax. Next, we present a bit-true model for Viterbi decoder and encoder of it with the constraint of having less than 0.5 dB degradation in the performance of the system while minimizing the hardware cost of it. Since the most sensitive modulation in the standard is 64QAM with the rate 5/6 for convolution coding, it has been used for bit-true modeling. While all of the system blocks are floating-point, we have extracted the BER of the ideal system under different channel noises with random binary input data and AWGN noise. We have validated our model by comparing its results with those of analytical formulas which are driven for AWGN channel noise. We have developed the bit-true model of the Viterbi block and have tuned the system to satisfy all of the standard requirements and the condition of less than 0.5 dB degradation in the performance at the worst case. This 0.5 dB condition is used in many papers as the implementation marginal value. Finally, the bit-true parameters of this experience can be used for different hardware realization structures (fixed-point or floating-point). Also samples of the input and output data of each block in the bit-true model can be used as a test bench for the same hardware structure. The final Viterbi decoder designed with traceback depth equal to 50 and 8 bit soft decision.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"47 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114130642","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 clustering algorithm for wireless sensor networks using Irregular Cellular Learning Automata 基于不规则元胞学习自动机的无线传感器网络聚类算法
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651323
M. Esnaashari, M. Meybodi
{"title":"A novel clustering algorithm for wireless sensor networks using Irregular Cellular Learning Automata","authors":"M. Esnaashari, M. Meybodi","doi":"10.1109/ISTEL.2008.4651323","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651323","url":null,"abstract":"Wireless sensor networks are usually made up of a large number of sensor nodes. Such large networks require algorithms which can maintain their performance while the network size gets larger and larger. Clustering is a very efficient method which can help many algorithms become scalable to networks of large sizes. Recently, irregular cellular learning automata is proposed as a suitable modeling tool for many sensor networkspsila applications and a clustering algorithm is given for proving this suitability. In this paper, we improve the proposed clustering algorithm which leads to more efficient clusters in terms of number of clusters, number of sparse clusters, and energy level of cluster heads.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"15 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":"131118698","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
A reliable transport protocol for Wireless Sensor Networks 无线传感器网络的可靠传输协议
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651343
M. Yaghmaee, D. Adjeroh
{"title":"A reliable transport protocol for Wireless Sensor Networks","authors":"M. Yaghmaee, D. Adjeroh","doi":"10.1109/ISTEL.2008.4651343","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651343","url":null,"abstract":"Designing a reliable transport protocol is a new challenging area in wireless sensor networks (WSNs). Traditional transport layer protocols (such as TCP and UDP) canpsilat directly be applied to the WSNs. Generally transport layer is responsible for congestion control and reliable packet delivery. Congestion is an essential problem in WSNs. It not only wastes the scarce energy due to a large number of retransmissions and packet drops, but also hampers the event detection reliability. Thus, to meet the quality of service (QoS) requirements of network applications, a reliable and fair transport protocol is mandatory. In this paper we present a reliable transport protocol for wireless sensor networks which not only controls the congestion in the network, but also provides reliability in packet delivery. The proposed model uses a rate control mechanism to adjust the transmission rate of each sensor node based on the congestion degree in the network. We use the time to recover packet loss as a congestion indicator. To use a nodepsilas energy efficiently, we use a hop-by-hop NACK based reliability guaranty model. Simulation results, confirm the superiority of the proposed model.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"6 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":"132924749","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
A Neural Network based local SNR estimation for estimating spectral masks 基于局部信噪比估计的神经网络频谱掩模估计
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651373
A. Hadjahmadi, M. Homayounpour, S. Ahadi
{"title":"A Neural Network based local SNR estimation for estimating spectral masks","authors":"A. Hadjahmadi, M. Homayounpour, S. Ahadi","doi":"10.1109/ISTEL.2008.4651373","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651373","url":null,"abstract":"In this work, we present a new mask estimation technique that uses a neural network classifier to determine the reliability of spectrographic elements. In addition some different kinds of features used for classification were compared that make no assumptions about the corrupting noise signal, but rather exploit spectrographic characteristics of the speech signal. The performance of the proposed method is experimentally evaluated in text independent speaker recognition task using the Gaussian mixture model (GMM) under various noise conditions. The speaker recognition results were achieved using the TFarsdat corpus. Noisy speech is simulated by adding noise sources taken from the NOISEX-92 database. Experimental results obtained show that the new neural network based mask estimation method is effective for speaker recognition under noisy conditions.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"191 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":"134403071","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
New algorithms for online unit clustering 在线单元聚类的新算法
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651398
Z. Mousavian, M. Dezfoulian
{"title":"New algorithms for online unit clustering","authors":"Z. Mousavian, M. Dezfoulian","doi":"10.1109/ISTEL.2008.4651398","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651398","url":null,"abstract":"We study the online unit clustering problem introduced by Chan and Zarrabi-Zadeh at WAOA 2006. The problem in one dimension is as follows: Given a sequence of points on the real line, partition the points into clusters, each enclosable by a unit interval, with the objective of minimizing the number of clusters used. In this paper, we give a brief survey on the existing algorithms for this problem, and compare their efficiency in practice by implementing all deterministic and randomized algorithms proposed thus far for this problem in the literature. Meanwhile, we introduce two new deterministic algorithms that achieve better performance ratios on average in practice.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"238 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":"114428037","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
XPM and SPM response of a chirped DFBSOA all-optical flip-flop 啁啾DFBSOA全光触发器的XPM和SPM响应
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651294
M. Jabbari, M. Moravvej-Farshi, R. Ghayour, A. Zarifkar
{"title":"XPM and SPM response of a chirped DFBSOA all-optical flip-flop","authors":"M. Jabbari, M. Moravvej-Farshi, R. Ghayour, A. Zarifkar","doi":"10.1109/ISTEL.2008.4651294","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651294","url":null,"abstract":"In this paper, deriving a dynamic model based on the coupled-mode and carrier rate equations, we have proposed a new technique to switch ON and OFF of a chirped DFB-SOA all-optical flip-flop based on self phase modulation (SPM) and cross phase modulation (XPM). We have shown that with this technique in an optimized condition into a DFB-SOA with chirped grating can improve the speed limitation in such a device, significantly. Values of the switching ON and OFF times for such an all optical flip-flop, obtain in an optimized condition are about 300 ps and 210 ps, with full width at half maximum (FWHM) of 50 ps and 100 ps and energies of the set and reset pulses, Eset=393 fJ and Ereset=25.55 pJ, respectively. Finite difference time domain (FDTD) method is utilized for the numerical simulations.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"82 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":"115857956","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
Improved Adaptive Protocol for authentication and key agreement 改进的自适应认证协议和密钥协议
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651262
N.A. Shalmany, A. Rahbar
{"title":"Improved Adaptive Protocol for authentication and key agreement","authors":"N.A. Shalmany, A. Rahbar","doi":"10.1109/ISTEL.2008.4651262","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651262","url":null,"abstract":"We explain the authentication and key agreement protocols for third-generation (3G) wireless communications. This protocol is known as 3GPP-AKA. We show this protocol is vulnerable to false base station attacks, and therefore, it needs synchronization between MS (mobile station) and HN (home network) that increases the complexity of system. Then, we analyze two techniques which are called adaptive protocol for AKA and extension of AKA. Any of these techniques eliminate some of the weaknesses of 3GPP-AKA. We combine these two techniques and propose a new technique, called improved adaptive protocol for AKA (IAP-AKA). We show this technique can be a good successor for 3GPP-AKA by eliminating synchronization, bandwidth wastage, and vulnerability to false base station attacks.","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":"115258462","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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