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2010 National Conference On Communications (NCC)最新文献

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The canonic linear-phase FIR lattice structures 经典线性相位FIR晶格结构
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430194
S. S. Yedlapalli, K. Hari
{"title":"The canonic linear-phase FIR lattice structures","authors":"S. S. Yedlapalli, K. Hari","doi":"10.1109/NCC.2010.5430194","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430194","url":null,"abstract":"The Linear phase(LP) Finite Impulse Response(FIR) filters are widely used in many signal processing systems which are sensitive to phase distortion. In this article, we obtain a canonic lattice structure of a LP-FIR filter with a complex impulse response. This lattice structure is based on some novel lattice stages obtained from some properties of symmetric polynomials. This canonic lattice structure exploits the redundancy in the zeros of a LP-FIR filter.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"68 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":"122000117","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
Exploiting signal and noise statistics for fixed point FFT design optimization in OFDM systems 利用信号和噪声统计进行OFDM系统的定点FFT设计优化
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430229
S. Ramakrishnan, J. Balakrishnan, K. Ramasubramanian
{"title":"Exploiting signal and noise statistics for fixed point FFT design optimization in OFDM systems","authors":"S. Ramakrishnan, J. Balakrishnan, K. Ramasubramanian","doi":"10.1109/NCC.2010.5430229","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430229","url":null,"abstract":"Scaling the different stage outputs in an FFT appropriately is crucial for getting a good Signal to Quantization noise ratio (SQNR) in fixed point FFT design. Traditional designs have either handled this through Convergent block floating point technique (CBFP), which has memory, computation and latency penalties or through time consuming simulations. In this paper, we consider the special case of FFT design for OFDM transceivers. We exploit the Gaussian nature of OFDM signals to predict the bit-growth of the signal through the various stages of the FFT and propose a technique to scale the signal appropriately. Additionally, we investigate the quantization error profile and propose a technique to improve SQNR by exploiting the presence of null tones at the band edges. With the proposed techniques, the performance comes close to the CBFP design, with no increase in complexity compared to existing static designs. Simulation results illustrating the performance improvements of the proposed technique are presented.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"2 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":"131132392","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
Fourier based rotation invariant texture features for content based image retrieval 基于傅里叶旋转不变性纹理特征的图像检索
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430201
B. Bama, S. Raju
{"title":"Fourier based rotation invariant texture features for content based image retrieval","authors":"B. Bama, S. Raju","doi":"10.1109/NCC.2010.5430201","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430201","url":null,"abstract":"This paper presents a statistical view of the texture retrieval problem by combining the two related steps, feature extraction and similarity measurement. Based on spectral representation of texture images under Fourier transform, rotation invariant signatures of orientation spectrum distribution are extracted. Peak Distribution Vector (PDV) obtained on the spectral signatures capture texture properties invariant to image and surface rotation. The PDV is used to measure the similarity measurement by computing sum of square distance between query and data base images. The method is applied to content based retrieval system with a database of over 1000 randomly chosen texture images from photometric texture database. Experimental results indicate that the new method significantly improves the retrieval rates compared with the Zhang's approaches while it retains comparable levels of computational complexity.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"94 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":"134303053","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
Performance analysis of Alamouti scheme with transmit antenna selection in MISO systems MISO系统中带发射天线选择的Alamouti方案性能分析
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430237
Y. Trivedi, A. Chaturvedi
{"title":"Performance analysis of Alamouti scheme with transmit antenna selection in MISO systems","authors":"Y. Trivedi, A. Chaturvedi","doi":"10.1109/NCC.2010.5430237","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430237","url":null,"abstract":"We consider a Multiple Input Single Output (MISO) system equipped with L<inf>t</inf> transmit antennas in spatially uncorrelated Rayleigh fading channels. We consider a sub-optimum Antenna Selection (AS) scheme, wherein all the L<inf>t</inf> antennas are divided into two groups with L<inf>1</inf> and L<inf>2</inf> antennas such that L<inf>1</inf>+L<inf>2</inf>=L<inf>t</inf>. Assuming perfect CSI, the best single antenna within each group is selected. For the well known Alamouti transmit diversity, we derive exact closed-form expressions for the pdf of received SNR, probability of outage and SER for MPSK and MQAM constellations.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"41 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":"123106866","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: 8
A frame aggregation scheduler for IEEE 802.11n ieee802.11 n的帧聚合调度程序
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430156
T. Selvam, S. Srikanth
{"title":"A frame aggregation scheduler for IEEE 802.11n","authors":"T. Selvam, S. Srikanth","doi":"10.1109/NCC.2010.5430156","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430156","url":null,"abstract":"Wireless Local Area Networks (WLANs) based on the IEEE 802.11 standard are widely deployed in the home and enterprise segments across the globe. The IEEE 802.11n is the latest amendment that aims to achieve throughput higher than 100 Mbps at the medium access control (MAC) layer. It defines two frame aggregation schemes to improve the efficiency over the basic 802.11 MAC layer. However, the IEEE specifications do not specify the scheduler for these schemes and it is left as vendor's choice. This paper presents a detailed simulation study of these aggregation schemes and presents a simple frame aggregation scheduler. The proposed method dynamically chooses the aggregated frame size and aggregation technique based on various relevant parameters.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"42 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":"131381589","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: 75
Outage probability of selection combiner over exponentially correlated Weibull-gamma fading channels for arbitrary number of branches 任意数量分支的指数相关威布尔衰落信道上选择组合器的中断概率
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430213
T. S. B. Reddy, R. Subadar, P. R. Sahu
{"title":"Outage probability of selection combiner over exponentially correlated Weibull-gamma fading channels for arbitrary number of branches","authors":"T. S. B. Reddy, R. Subadar, P. R. Sahu","doi":"10.1109/NCC.2010.5430213","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430213","url":null,"abstract":"Outage probability of a selection combiner (SC) receiver is analyzed over exponentially correlated composite Weibull-gamma fading channels. An expression for the joint probability density function (PDF) of multivariate, exponentially correlated Weibull-gamma distributed random variable is obtained. Using this joint PDF, we derive an expression for the outage probability of a SC receiver with arbitrary number of input branches. Obtained expressions are numerically evaluated and the effect of fading parameters, correlation coefficient and diversity order on the outage are studied.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"14 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":"123049483","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
Performance of a L-branch predetection EGC receiver over independent Hoyt fading channels for M-ary coherent and noncoherent modulations using PDF-based approach 基于pdf的l支路预检测EGC接收机在独立Hoyt衰落信道上的性能研究
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430235
A. Baid, Pratik Kotkar, P. R. Sahu
{"title":"Performance of a L-branch predetection EGC receiver over independent Hoyt fading channels for M-ary coherent and noncoherent modulations using PDF-based approach","authors":"A. Baid, Pratik Kotkar, P. R. Sahu","doi":"10.1109/NCC.2010.5430235","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430235","url":null,"abstract":"Performance of a L-branch predetection equal gain combining receiver has been analyzed in independent Hoyt fading channels with arbitrary fading parameters applying classical probability density function (PDF) based approach. An approximate but highly accurate PDF of the sum of independent Hoyt random variables has been used for the analysis. Simple and easy to evaluate expressions for the outage probability and amount of fading have been obtained. An expression for average symbol error rate, in the form of an infinite series with a single integral with finite limits has been obtained which is applicable for a number of M-ary coherent and noncoherent modulations. Numerically evaluated results have been compared with the published results to verify the correctness of the derived expressions.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"2 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":"132516729","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
A melody detection user interface for polyphonic music 复调音乐的旋律检测用户界面
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430181
Sachin Pant, V. Rao, P. Rao
{"title":"A melody detection user interface for polyphonic music","authors":"Sachin Pant, V. Rao, P. Rao","doi":"10.1109/NCC.2010.5430181","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430181","url":null,"abstract":"The automatic extraction of the melody of the music from polyphonic recordings is a challenging problem for which no general solutions currently exist. We present a novel interface for semi-automatic melody extraction with the goal to provide highly accurate pitch tracks of the lead voice with minimal user intervention. Audio-visual feedback facilitates the validation of the obtained melodic contour and user control of the analysis parameters enables direct and effective control over the voice pitch detection module by the intelligent user. This paper describes the interface and discusses the features in which it differs from more conventional audio analyses interfaces.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"7 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":"127512377","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: 18
Performance analysis of a multi-relay cooperative diversity network with decode and forward relaying 具有译码和转发中继的多中继合作分集网络性能分析
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430227
M. D. Selvaraj, R. Mallik
{"title":"Performance analysis of a multi-relay cooperative diversity network with decode and forward relaying","authors":"M. D. Selvaraj, R. Mallik","doi":"10.1109/NCC.2010.5430227","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430227","url":null,"abstract":"Consider a multi-relay cooperative diversity network consisting of a source, N relays, and a destination. For the transmission of a data symbol from the source to the destination, the relays cooperate with the source through the decode and forward protocol. All the links are statistically independent and undergo flat Rayleigh fading. Conventional instantaneous signal-to-noise ratio based selection combining at the destination chooses one link from the set consisting of the source-to-destination link and the N relay-to-destination links. However, this scheme does not account for the effect of the source-to-relay links in the error performance. To overcome this drawback, we present here a scaled selection combining scheme, which accounts for this effect through a deterministic scale factor. The end-to-end symbol error probability (SEP) of this scheme with binary phase-shift keying is derived in closed form. We also give a method of obtaining the optimum scale factor that minimizes the end-to-end SEP.","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":"127587564","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: 7
Study element based adaptation of lecture videos to mobile devices 基于学习元素的讲座视频在移动设备上的改编
2010 National Conference On Communications (NCC) Pub Date : 2010-03-15 DOI: 10.1109/NCC.2010.5430161
Ganesh Narayana Murthy, S. Iyer
{"title":"Study element based adaptation of lecture videos to mobile devices","authors":"Ganesh Narayana Murthy, S. Iyer","doi":"10.1109/NCC.2010.5430161","DOIUrl":"https://doi.org/10.1109/NCC.2010.5430161","url":null,"abstract":"With devices like mobile phones and PDAs becoming pervasive especially among students, there is a demand for viewing lecture videos on such devices, to get quick access to educational content. But, being traditionally designed for desktop computers, lecture videos have high video bit-rates, due to which viewing them on low network bandwidth connections like GPRS incurs long delays and high costs. In this paper, we propose a novel method for adapting lecture videos, to make them viewable on low bandwidth connections, at low cost. Our idea is to exploit redundancy present in lecture videos, such as non-changing presentation slides. We define study-elements within the video that have varying levels of redundancy and user-expectations. We send images at different intervals, such as one image every five seconds, according to the Study-Element involved along with continuous audio. In our experiments, we have found that for a video of size 432MB, our method achieved 97% reduction in size, that was better than that achieved by standard codecs for that video. Additionally, our method can be customized according to the level of user experience desired.","PeriodicalId":130953,"journal":{"name":"2010 National Conference On Communications (NCC)","volume":"103 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":"123706475","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: 10
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