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2008 International Symposium on Telecommunications最新文献

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A modified wavelet-domain adaptive filtering algorithm for stereophonic acoustic echo cancellation in the teleconferencing application 一种改进的小波域自适应滤波算法用于立体声回波消除在电话会议中的应用
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651362
M. Bekrani, M. Lotfizad
{"title":"A modified wavelet-domain adaptive filtering algorithm for stereophonic acoustic echo cancellation in the teleconferencing application","authors":"M. Bekrani, M. Lotfizad","doi":"10.1109/ISTEL.2008.4651362","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651362","url":null,"abstract":"Stereophonic acoustic echo cancellers (SAEC) have problems more severe than monophonic echo cancellers. The most important problem is the misalignment, which is the mismatch between the impulse responses of adaptive filters and those of the acoustic paths of the receiving room (in the teleconferencing application, as an example) and therefore a severe divergence of filters in the event of abrupt changes of the transmission room acoustic paths. The main reason for such mismatching is the two-channel nature of the system and the high degree of cross-correlation of the input signals of those channels. In this paper, we try to reduce the correlation between the two channels in the transform domain. To achieve this, with inspiration from the lattice predictor structure, we present a novel approach for reduction of cross-correlation of the input vectors of two channels in the wavelet domain that lead to a reduction in the misalignment of adaptive filters for the SAEC.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"13 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":"116681599","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
Array pattern synthesis with mutual coupling consideration 考虑相互耦合的阵列方向图综合
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651275
H. Oraizi, M. Fallahpour
{"title":"Array pattern synthesis with mutual coupling consideration","authors":"H. Oraizi, M. Fallahpour","doi":"10.1109/ISTEL.2008.4651275","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651275","url":null,"abstract":"In this paper, the orchard relations are extended to include the general pattern forms such as symmetrical and nonsymmetrical sum patterns and difference patterns. Then the genetic algorithm (GA) is used to find the optimum root locations that generate the desired pattern from the extended relations. Also, for the first time, we directly impose the constraints on generator voltages and reduce the dynamic range of voltage sources. Also we consider the mutual coupling (MC) in pattern synthesis with the isolated element pattern method and modify generator voltages to include MC. We show that this method is an effective method for wire elements.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"1 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":"123267576","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
Affects of SP-Pictures on bitstream switching through monotonically decreasing rate schedulers for streaming of H.264/AVC coded video 在H.264/AVC编码视频流中，SP-Pictures对比特流切换的影响
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651350
M. Altaf, E. Khan, M. Ghanbari
{"title":"Affects of SP-Pictures on bitstream switching through monotonically decreasing rate schedulers for streaming of H.264/AVC coded video","authors":"M. Altaf, E. Khan, M. Ghanbari","doi":"10.1109/ISTEL.2008.4651350","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651350","url":null,"abstract":"In this paper we analyze the affects of switching frames (SP-frames) on the Quality of Service (QoS) parameters for streaming of H.264/AVC coded video bitstreams. In order to initiate streaming, the initial bandwidth requirement is estimated using monotonically decreasing rate scheduler (downstairs reservation function). We have observed that, insertion of the SP pictures can change the characteristics of the downstairs reservation function. These changes are critically analyzed and a solution is proposed in order to design efficient switching algorithm to achieve the best QoS. Extensive simulations are performed to investigate the changes in the downstairs reservation scheme with the inserted SP Pictures and the proposed algorithm under the H.264/AVC framework.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"4 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":"115569948","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
Optimum mixture estimator for single-channel speech separation 单通道语音分离的最优混合估计器
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651361
Pejman Mowlaee, A. Sayadiyan, M. Sheikhan
{"title":"Optimum mixture estimator for single-channel speech separation","authors":"Pejman Mowlaee, A. Sayadiyan, M. Sheikhan","doi":"10.1109/ISTEL.2008.4651361","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651361","url":null,"abstract":"In this paper, we present proofs for optimum mixture estimator for mixture estimator for single-channel speech separation (SSCS) problem. We demonstrate that by replacing the proposed optimum estimator with mixture-maximization (Mixmax) or Quadratic estimators, it is possible to reach at a lower estimation error while separating mixture of speech signals. In addition, the proposed estimator results in less cross-talk as well as higher perceptual quality in the separated speech signals. Compared to other estimators including Mixmax, the proposed method attains these merits without using non-linear mapping used in Mixmax i.e. taking log and inverse-log. Experimental results on real speech data also confirm the superiority of the proposed estimator to others in Mean Square Error (MSE) sense.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"48 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":"129524365","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: 11
A quality preserving exact histogram specification 保持质量的精确直方图规范
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651409
A. Avanaki
{"title":"A quality preserving exact histogram specification","authors":"A. Avanaki","doi":"10.1109/ISTEL.2008.4651409","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651409","url":null,"abstract":"The state-of-the-art exact histogram specification algorithm by Coltuc and others is improved. We use the image generated by this method as our initial starting point and improve its visual quality by application of several histogram-invariant transformations on the image, making it more and more similar to the source image. Experimental results verify the superb performance of the proposed method.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"24 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":"128653781","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
A novel flow control scheme for best effort traffics in Network-on-Chip based on Weighted Max-Min-fairness 基于加权最大-最小公平性的片上网络最优流量控制方案
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651346
Fahimeh Jafari, M. Yaghmaee
{"title":"A novel flow control scheme for best effort traffics in Network-on-Chip based on Weighted Max-Min-fairness","authors":"Fahimeh Jafari, M. Yaghmaee","doi":"10.1109/ISTEL.2008.4651346","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651346","url":null,"abstract":"Network on chip (NoC) has been proposed as an attractive alternative to traditional dedicated busses in order to achieve modularity and high performance in the future system-on-chip (SoC) designs. Recently, end to end flow control has gained popularity in the design process of network-on-chip based SoCs. Where flow control is employed, fairness issues need to be considered as well. In fact, one of most difficult aspects of flow control is that of treating all sources fairly when it is necessary to turn traffic away from the network. In this paper, we propose a flow control scheme which admits max-min fairness criterion for all sources. In fact, we formulate weighted max-min fairness criterion for the NoC architecture and present implementation to be used as flow control mechanism.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"39 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":"124968349","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 new clustering protocol for Mobile Ad-Hoc networks 一种新的移动Ad-Hoc网络聚类协议
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651331
M. Rezaee, M. Yaghmaee
{"title":"A new clustering protocol for Mobile Ad-Hoc networks","authors":"M. Rezaee, M. Yaghmaee","doi":"10.1109/ISTEL.2008.4651331","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651331","url":null,"abstract":"Mobile ad-hoc network (MANET) is a type of communication network which is used for data communication between a group of mobile nodes using wireless channels. Clustering has evolved as an important research topic in MANETs as it improves the system performance of large MANETs. Clustering is a process that divides the network into interconnected substructures, called clusters. Each cluster has a cluster head as coordinator within the substructure. In this paper, we propose a new clustering protocol for MANET. The proposed algorithm is a very quick clustering algorithm and creates minimum clusters with maximum member node in each cluster. The simulation results show that the proposed algorithm provides better performance in terms of the number of formed clusters and average number of transition (state change) on cluster heads when compared to that of other weight based algorithms such as weighted clustering algorithm (WCA).","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"79 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":"126240942","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: 13
A new empirical-physical method for calculation of path loss for fixed wireless access in suburban areas 一种计算城郊固定无线接入路径损耗的经验物理新方法
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651278
S. Majedi, F. Farzaneh
{"title":"A new empirical-physical method for calculation of path loss for fixed wireless access in suburban areas","authors":"S. Majedi, F. Farzaneh","doi":"10.1109/ISTEL.2008.4651278","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651278","url":null,"abstract":"In this paper a new empirical-physical method for calculation of path loss in the fixed wireless access in suburban areas is proposed. It is shown that this method has a relatively good accuracy for high transmitter antennas. Since in fixed wireless access, high transmitter antennas are used, we can use this method for this kind of communications and in special case for systems based on IEEE 802.16a. In this method a new empirical model for calculation of path loss exponent is used which is based on measurements reported in various papers and in contrast to other models, the effect of receiver antenna height in the path loss exponent is considered. The first step of this method is the calculation of path loss for a 2D scenario by using GO and UTD methods with respect to transmitter-receiver distance. Then using new empirical model, path loss exponent is corrected and in this manner, the final path loss is obtained.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"3 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":"127967654","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
Photonic microwave bandpass filter with negative coefficient based on an optical phase modulator and an optical polarizer 基于光相位调制器和光偏振器的负系数光子微波带通滤波器
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651291
R. Heydari, M. Salehi
{"title":"Photonic microwave bandpass filter with negative coefficient based on an optical phase modulator and an optical polarizer","authors":"R. Heydari, M. Salehi","doi":"10.1109/ISTEL.2008.4651291","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651291","url":null,"abstract":"In this paper, a photonic microwave bandpass filter with negative coefficient is investigated. The output light from a phase modulator and a polarization-maintaining fiber (PMF) is sent to the optical polarizer. Negative coefficient is generated due to the optical interference of the two polarization modes using the polarizer. A two-tap microwave bandpass filter with one negative coefficient is demonstrated.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"342 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":"134176135","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
Network design and interconnection pricing in a heterogeneous terrain 异质地形下的网络设计与互联定价
2008 International Symposium on Telecommunications Pub Date : 2008-10-14 DOI: 10.1109/ISTEL.2008.4651356
S. K. Samanta, John Woods, Mohammed Ghanbari
{"title":"Network design and interconnection pricing in a heterogeneous terrain","authors":"S. K. Samanta, John Woods, Mohammed Ghanbari","doi":"10.1109/ISTEL.2008.4651356","DOIUrl":"https://doi.org/10.1109/ISTEL.2008.4651356","url":null,"abstract":"In the design of a telecom network, the selection of link technology in a heterogeneous terrain is a challenging task as cost varies according to distance and total bandwidth. Traditionally research effort considers only distance and bandwidth for modelling of financial cost and ignores the effects terrain may have. We show quantitatively how geographical terrain and associated link technology influence the total cost. Our approach has implications for regulators who need to govern interconnection prices of services (voice, message or data) which may be provided by networks of different operators. We have modelled the link cost based on distance, bandwidth, terrain and technology simultaneously using a general error regression technique applied to real data obtained from the Indian Telecom Company, BSNL. We show that the error between the actual and modelled cost is less than 5% for all cases. Using our model, the financial cost to the operator is reduced and regulators can ensure a balanced development for the country.","PeriodicalId":133602,"journal":{"name":"2008 International Symposium on Telecommunications","volume":"104 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132879652","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
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