2015 Twenty First National Conference on Communications (NCC)最新文献_第10页

An adaptive refresh distributed model for estimation and efficient tracking of dynamic boundaries 一种用于动态边界估计和有效跟踪的自适应刷新分布式模型

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084893

Nagarathna, S. Valli

引用次数: 4

Relay placement and spectrum sharing strategies for soft and fractional frequency reuse schemes 软频率和分数频率复用方案的中继放置和频谱共享策略

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084854

Sanjay Ghosh, A. P. Kannu

引用次数: 1

Pitch estimation from speech using Grating Compression Transform on Modified Group-Delay-gram 基于改进群延迟图的光栅压缩变换的语音基音估计

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084899

J. Sebastian, M. Kumar, H. Murthy

{"title":"Pitch estimation from speech using Grating Compression Transform on Modified Group-Delay-gram","authors":"J. Sebastian, M. Kumar, H. Murthy","doi":"10.1109/NCC.2015.7084899","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084899","url":null,"abstract":"This work presents an approach for pitch extraction based on Grating Compression Transform (GCT) on harmonically-enhanced Modified Group-Delay-gram (Modgdgram). The work explores the use of peakedness and high resolution properties of the group delay functions and the ability of GCT to smear harmonically related components in the spectrum and to track pitch across frames. The power spectrum of the signal is divided by a cepstrally smoothened version of the power spectrum to obtain flattened spectrum. Owing to the picket-fence harmonics due to pitch in the flattened spectrum, the spectrum resembles a sinusoid that is corrupted by noise. This signal is treated as a sinusoidal signal and modified group delay based analysis is performed. Localized time-frequency regions of Modgdgram are used for GCT computation. Peak picking is performed on the resulting rate-scale domain and pitch dynamics are used to finalize the pitch values. The proposed algorithm without any post processing is compared with the traditional GCT computed on the magnitude spectrum and the modified group delay alone. Both natural and synthetic speech are considered for evaluation and an overall improvement of 27% is obtained in the error measures. Finally, two commonly used advanced algorithms which include post processing steps are also considered and the results obtained are comparable.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128330032","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

Performance analysis of MISO systems with antenna selection over correlated channels 相关信道上天线选择的MISO系统性能分析

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084837

J. M. Chakravarti, Y. Trivedi

{"title":"Performance analysis of MISO systems with antenna selection over correlated channels","authors":"J. M. Chakravarti, Y. Trivedi","doi":"10.1109/NCC.2015.7084837","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084837","url":null,"abstract":"Antenna selection in multiple antenna systems is used as there is no loss of diversity gain. However, in a practical scenario, there is a spatial correlation between adjacent antennas. In this paper, a multiple input single output (MISO) system is considered with L transmit antennas. At the transmitter, the antennas are divided into N = L over 2 groups. We assume that there is a correlation η between two antennas of each group, however there is no correlation between antennas of two different groups. The group for which the summation of the channel power gain is highest, is selected. Then, using Alamouti transmit diversity, we derive the exact closed-form expression for the pdf of received SNR, using which we obtain symbol error rate (SER) for MPSK and MQAM constellations, and outage probability in simple form. It is proved analytically that the diversity gain of the considered system reduces to two for η ≠ 0. The SER expressions have been reduced for some special cases and compared with the available results in literature. We have presented simulation results and compared them with the derived analytical expressions.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134089082","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

Wavelength sensitivity of the excited single mode in the output Multimode fiber of an SMm structure SMm结构输出多模光纤中受激单模的波长灵敏度

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084829

N. Bhatia, J. John

引用次数: 1

Spatial CSMA: A distributed scheduling algorithm for the SIR model with time-varying channels 空间CSMA:一种时变信道SIR模型的分布式调度算法

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084891

Subrahmanya Swamy Peruru, R. Ganti, K. Jagannathan

引用次数: 4

Microstrip-fed monopole antennas loaded with symmetric ENG unit cells 装有对称ENG单元的微带馈电单极天线

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084834

S. V. Reddy, K. Saurav, D. Sarkar, K. V. Srivastava

引用次数: 1

OpenPAWS: An open source PAWS and UHF TV White Space database implementation for India OpenPAWS:用于印度的开源PAWS和UHF电视空白空间数据库实现

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084890

Soumik Ghosh, Gaurang Naik, Animesh Kumar, A. Karandikar

引用次数: 12

Jamming in fading Multiple Access Channels 衰落多址信道中的干扰

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084927

Amitalok J. Budkuley

{"title":"Jamming in fading Multiple Access Channels","authors":"Amitalok J. Budkuley","doi":"10.1109/NCC.2015.7084927","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084927","url":null,"abstract":"A fading Multiple Access Channel with a jammer is considered and a non-cooperative game between the two users and the jammer is formulated. Here, both the user-receiver links as well as the jammer-receiver link are time-varying fading links. The decoder employed is a successive cancellation decoder. To begin with, the decoder announces a scheme where it shares with the users and the jammer their decoding order as a function of the combined channel state observed. Equivalently, this scheme is a partition of the space of all channel states into two sets. For the observed channel states belonging to the first set, the first user is decoded followed by the second, while for the states belonging to the other set, the decoding order is reversed. Each user aims to maximize its own rate whilst treating the other user as noisy interference. The adversarial jammer chooses its channel input so as to minimize overall throughput. We show that for every decoding scheme announced by the decoder, the resulting game has a unique Pareto-dominated Nash equilibrium. Also, connections with relevant existing results on fading Multiple Access Channels with a jamming adversary, specifically w.r.t the equilibrium sum-rate operating point, are discussed.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126899087","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

Integrated approach for proxy-mobile-IPv6 (PMIPv6) based IP Flow Mobility and offloading 基于代理-移动- ipv6 (PMIPv6)的IP流迁移和卸载集成方法

2015 Twenty First National Conference on Communications (NCC) Pub Date : 2015-02-01 DOI: 10.1109/NCC.2015.7084882

Madhavan Kalyanaraman, S. Seetharaman, S. Srikanth

{"title":"Integrated approach for proxy-mobile-IPv6 (PMIPv6) based IP Flow Mobility and offloading","authors":"Madhavan Kalyanaraman, S. Seetharaman, S. Srikanth","doi":"10.1109/NCC.2015.7084882","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084882","url":null,"abstract":"Mobile data traffic has increased drastically during last few years and expected to increase multifold in the coming years. Heterogeneous wireless networks have made it possible to have simultaneous traffic flows on all available wireless accesses. IP Flow Mobility (IFOM) which has been standardized from 3GPP Release 10 provides possibility to seamlessly transfer individual flows from one access to another. The flow transfer can happen due to different factors like saving cellular resources, using low cost interface, load balancing etc. However, an integrated mechanism to identify whether a traffic flow has to be moved to a different interface considering user preferences, network quality, mobility, policy aspects, network protocols supported and terminal capability is not available. This paper proposes a mechanism that dynamically assesses the interface used for each traffic flow and determines the need for flow transfer to attain better quality of experience for user while using cellular network resources in an optimal manner. We propose the architecture illustrating the various components and their interactions to realize our proposed mechanism of flow transfer/offload based on the discussed criteria. A simulation framework that will be used to validate our approach and demonstrate its benefits/improvements under various practical scenarios is also presented.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130610657","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