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2010 National Conference On Communications (NCC)最新文献

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Coding gain optimized finite impulse response (FIR) Paraunitary (PU) filter banks 编码增益优化有限脉冲响应(FIR)准酉(PU)滤波器组
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430199
Ansh Jhawar, Pranav Ginde, P. Patwardhan, V. Gadre
{"title":"Coding gain optimized finite impulse response (FIR) Paraunitary (PU) filter banks","authors":"Ansh Jhawar, Pranav Ginde, P. Patwardhan, V. Gadre","doi":"10.1109/NCC.2010.5430199","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430199","url":null,"abstract":"Filter bank optimization for coding gain maximization for given input statistics has been well studied before. Principal Component Filter Banks (PCFB) have proven to be optimal whenever the minimization objective is a concave function of the subband variances produced by the filter bank. However PCFBs are known to exist for only three special classes of orthonormal filter banks(FBs): Any class of two channel FBs, the transform coder class and the unconstrained order subband coder class. This paper explores the design of FIR Paraunitary(PU) FBs for special case of uniform 3-band subband coder class, giving a detailed analysis of the design method. This method directly maximizes the coding gain. Results have been compared to the PCFB approximation algorithm by Peter Vouras and Trac D. Tran which uses complete parameterization of FIR PU FBs in terms of Givens rotation building blocks.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126965952","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
On the bounds of separability in sensor networks 传感器网络的可分性边界
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430169
B. Krishnan
{"title":"On the bounds of separability in sensor networks","authors":"B. Krishnan","doi":"10.1109/NCC.2010.5430169","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430169","url":null,"abstract":"A pair of target locations are separable if sensor observations can distinguish between the following choices: no targets are present, one target is present at either of the locations or a target is present at each location. The sensors of interest in this paper are binary proximity sensors, whose binary outputs are functions of the distance between the sensor and target. Sensors are deployed randomly according to a Poisson distribution. The probability that two target locations at a distance of r between them are separable is derived. This is extended to derive the probability of having at least Z among M uniformly distributed target locations to be non-separable from the origin. The bounds on this probability are expressed as a function of the sensor density λ.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127944400","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
Characterizing multi-photon states using gated photo-detection 用门控光探测表征多光子态
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430154
S. Krishnamoorthy, S. Thiruthakkathevan, A. Prabhakar
{"title":"Characterizing multi-photon states using gated photo-detection","authors":"S. Krishnamoorthy, S. Thiruthakkathevan, A. Prabhakar","doi":"10.1109/NCC.2010.5430154","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430154","url":null,"abstract":"We describe a system that can temporally separate photons in a multi-photon resolving detector. A time delay, using 239m of optical fibre in a feedback loop sends a part of the incident photon stream back to the system, through a directional coupler. The residual optical power is detected using a gated avalanche photo-detector. The two primary aspects considered while studying this system were the separation of photon pulse in space by the coupler, and the timing aspects of the setup required to achieve synchronization between detector and the source. A timing analysis permits us to verify some properties of the input coherent optical state.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116062440","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
Fuzzy Directional Features for unconstrained on-line Devanagari handwriting recognition 基于模糊方向特征的无约束在线Devanagari手写识别
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430176
V. Lajish, Sunil Kumar Kopparapu
{"title":"Fuzzy Directional Features for unconstrained on-line Devanagari handwriting recognition","authors":"V. Lajish, Sunil Kumar Kopparapu","doi":"10.1109/NCC.2010.5430176","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430176","url":null,"abstract":"This paper describes a novel feature set for recognition of unconstrained on-line handwritten Devanagari script. Experiments are conducted for the automatic recognition of handwritten character primitives (sub-character units) collected without any constraints from different writers. Initially we describe the Fuzzy Directional Feature (FDF) extraction method and then show how these features can be effectively utilized for writer independent Devanagari character recognition. The recognition algorithm uses second order statistics to construct different stroke models. Experimental results show that FDF set out performs commonly used Directional Features (DF) for writer independent data set at stroke level recognition.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124123761","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: 14
Performance analysis of zone routing protocols in Mobile Ad Hoc Networks 移动Ad Hoc网络中区域路由协议性能分析
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430164
Brijesh V. Patel, S. Srivastava
{"title":"Performance analysis of zone routing protocols in Mobile Ad Hoc Networks","authors":"Brijesh V. Patel, S. Srivastava","doi":"10.1109/NCC.2010.5430164","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430164","url":null,"abstract":"In Mobile Ad Hoc Networks (MANETs), routing is a challenging task due to node mobility, traffic and network size. It is very important to analyze the scalability characteristics of the routing protocols with respect to these parameters. Zone Routing Protocol (ZRP) is considered to be one of the most scalable routing protocols due to its multi-scoping and hybridization features. We propose a general, parameterized model for analyzing control overhead of ZRP. A generic probabilistic model for data traffic is also proposed which can be replaced by different traffic models. Our analytical model is validated by comparisons with simulations performed under different network scenarios. In our simulation results, we have observed that the optimal zone radius lies at a point where proactive and reactive overhead components of ZRP are approximately equal as observed in [1]. Further, as the mobility increases the optimal zone radius value decreases, and as the traffic increases the value of optimal zone radius increases. If a node operates away from the optimal zone radius setting then it has to bear additional routing overhead. We show that the additional overhead is around 35% higher under a wide range of mobility scenarios.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126167785","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: 35
A multicarrier CDMA based low probability of intercept network 基于低截获概率的多载波CDMA网络
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430216
Sayan Ghosal, D. Jalihal, K. Giridhar
{"title":"A multicarrier CDMA based low probability of intercept network","authors":"Sayan Ghosal, D. Jalihal, K. Giridhar","doi":"10.1109/NCC.2010.5430216","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430216","url":null,"abstract":"The need for covert communication in tactical battlefields has developed the ideas of low probability of intercept (LPI) networks. Spread spectrum communication is used for LPI communication. Multicarrier CDMA is a new type of spread spectrum technique that has been developed in recent years. Most of the works in MC-CDMA are focused on finding out BER performance of it when different users share the same time and spectral ranges. But, LPI performance of MC-CDMA is not explored much. In this paper we have focused on understanding the LPI property of MC-CDMA. We have found out that increasing spreading factor and application of forward error control coding improve LPI property of MC-CDMA based wireless networks to a great extent.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130115524","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 GLRT detector in partially correlated texture based compound-Gaussian clutter 基于复合高斯杂波的部分相关纹理GLRT检测器
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430182
L. P. Roy, Ratnam V. Raja Kumar
{"title":"A GLRT detector in partially correlated texture based compound-Gaussian clutter","authors":"L. P. Roy, Ratnam V. Raja Kumar","doi":"10.1109/NCC.2010.5430182","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430182","url":null,"abstract":"This paper addresses the problem of target detection in the presence of a non-Gaussian clutter modeled in compound-Gaussian form which realizes the clutter process as a product of two independent random processes ‘texture’ and ‘speckle’. The likelihood ratio test (LRT) detector applied to this detection problem reduces the detector to a matched filter (MF) when the texture is considered as completely correlated during a coherent processing interval (CPI). However, in practical applications, the textural component exhibits a correlation which is less than unity. The conventional form of MF based detectors existing in the literature yield a significant fall in the detection performance in such clutter scenarios. In this paper, we propose a generalized likelihood ratio test (GLRT) detector which can effectively detect a fluctuating target in the presence of a compound-Gaussian clutter with partially correlated texture. The results are presented to show the performance superiority of the proposed detector over the existing MF detector in such varying texture scenarios.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122015245","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
Evaluating vowel pronunciation quality: Formant space matching versus ASR confidence scoring 评估元音发音质量:共振峰空间匹配与ASR可信度评分
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430187
Ashish Patil, Chitralekha Gupta, P. Rao
{"title":"Evaluating vowel pronunciation quality: Formant space matching versus ASR confidence scoring","authors":"Ashish Patil, Chitralekha Gupta, P. Rao","doi":"10.1109/NCC.2010.5430187","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430187","url":null,"abstract":"Quantitative evaluation of the quality of a speaker's pronunciation of the vowels of a language can contribute to the important task of speaker accent detection. Our aim is to qualitatively and quantitatively distinguish between native and non-native speakers of a language on the basis of a comparative study of two analysis methods. One deals with relative positions of their vowels in formant (F1-F2) space that conveys important articulatory information. The other method exploits the sensitivity of trained phone models to accent variations, as captured by the log likelihood scores, to distinguish between native and non-native speakers.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121040280","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: 9
Robust LLR aided low feedback precoding for interference alignment 鲁棒LLR辅助低反馈干扰对准预编码
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430223
N. Vinoth, A. Ayyar, B. Ramamurthi, K. Giridhar
{"title":"Robust LLR aided low feedback precoding for interference alignment","authors":"N. Vinoth, A. Ayyar, B. Ramamurthi, K. Giridhar","doi":"10.1109/NCC.2010.5430223","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430223","url":null,"abstract":"Interference alignment, as proposed in [1], is a joint multi-base-station precoding technique where each interfering base-station determines its precoder so as to obtain aligned interfering signals at each user. Determination of such precoders requires complete channel state information of all the interfering links to be present at all the base-stations. In this paper, we present a modified form of interference alignment based on locally-available channel state information at the user equipment. We consider the downlink of a wireless system where basestations and user equipments are equiped with two antennas each and scheduling of users is done based on Fractional Frequency Reuse. Assuming an MMSE receiver at the user equipment, an expression for the optimal precoder to be used by the interfering base-stations is derived so that there is zero interference after MMSE equalization. We also give an example for the case where there is uncancelled interference despite the use of these precoders. The effect of this uncancelled interference is overcome by the use of a robust LLR developed in [2]. Simulation results that demonstrate the performance of the proposed technique are presented.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122234771","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
Performance analysis of subband-level channel quality indicator feedback scheme of LTE LTE子带级信道质量指标反馈方案的性能分析
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430218
Sushruth N. Donthi, N. Mehta
{"title":"Performance analysis of subband-level channel quality indicator feedback scheme of LTE","authors":"Sushruth N. Donthi, N. Mehta","doi":"10.1109/NCC.2010.5430218","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430218","url":null,"abstract":"Frequency-domain scheduling and rate adaptation enable next generation wireless cellular systems such as Long Term Evolution (LTE) to achieve significantly higher downlink throughput. LTE assigns subcarriers in chunks, called physical resource blocks (PRBs), to users to reduce control signaling overhead. To reduce the enormous feedback overhead, the channel quality indicator (CQI) report that is used to feed back channel state information is averaged over a subband, which, in turn, is a group of multiple PRBs. In this paper, we develop closed-form expressions for the throughput achieved by the subband-level CQI feedback mechanism of LTE. We show that the coarse frequency resolution of the CQI incurs a significant loss in throughput and limits the multi-user gains achievable by the system. We then show that the performance can be improved by means of an offset mechanism that effectively makes the users more conservative in reporting their CQI.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133660599","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: 23
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