Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176905
D. Guha, S. Pathak
In this paper we discuss a mixed policy comprising of exhaustive and gated vacation policies for a two queue system where the first queue has two priorities (high and low) of voice traffic and second queue has data traffic arrival. First queue is served in a mixed order, exhaustive for high priority and gated for low priority. The gate in front of the second queue is independent of the first queue. We have derived probability generating function (PGF) of joint queue length distribution at the visit beginning epoch of first queue and Laplace-Stieltjes Transform (LST) of distribution of waiting time and service cycle for first queue. Our result shows reduction in mean waiting time for high priority voice traffic at the cost of increasing mean waiting time for low priority voice traffic.
{"title":"Analysis and performance comparison of uniform and mixed service policy for vacation queue","authors":"D. Guha, S. Pathak","doi":"10.1109/NCC.2012.6176905","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176905","url":null,"abstract":"In this paper we discuss a mixed policy comprising of exhaustive and gated vacation policies for a two queue system where the first queue has two priorities (high and low) of voice traffic and second queue has data traffic arrival. First queue is served in a mixed order, exhaustive for high priority and gated for low priority. The gate in front of the second queue is independent of the first queue. We have derived probability generating function (PGF) of joint queue length distribution at the visit beginning epoch of first queue and Laplace-Stieltjes Transform (LST) of distribution of waiting time and service cycle for first queue. Our result shows reduction in mean waiting time for high priority voice traffic at the cost of increasing mean waiting time for low priority voice traffic.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936819","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176848
K. Sreenivasa Rao, Ketan Pachpande, R. R. Vempada, Sudhamay Maity
In this paper, we proposed two-stage segmentation approach for splitting the TV broadcast news bulletins into sequence of news stories. In the first stage, speaker (news reader) specific characteristics present in initial headlines of the news bulletin are used for gross level segmentation. During second stage, errors in the gross level segmentation (first stage) are corrected by exploiting the speaker specific information captured from the individual news stories other than headlines. During headlines the captured speaker specific information is mixed with background music, and hence the segmentation at the first stage may not be accurate. In this work speaker specific information is represented by using mel frequency cepstral coefficients (MFCCs), and it is captured by using Gaussian mixture models (GMMs). The proposed two-stage segmentation method is evaluated on manual segmented ten broadcast TV news bulletins. From the evaluation results, it is observed that about 93% of the news stories are correctly segmented, 7% are missed and 11% are spurious.
{"title":"Segmentation of TV broadcast news using speaker specific information","authors":"K. Sreenivasa Rao, Ketan Pachpande, R. R. Vempada, Sudhamay Maity","doi":"10.1109/NCC.2012.6176848","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176848","url":null,"abstract":"In this paper, we proposed two-stage segmentation approach for splitting the TV broadcast news bulletins into sequence of news stories. In the first stage, speaker (news reader) specific characteristics present in initial headlines of the news bulletin are used for gross level segmentation. During second stage, errors in the gross level segmentation (first stage) are corrected by exploiting the speaker specific information captured from the individual news stories other than headlines. During headlines the captured speaker specific information is mixed with background music, and hence the segmentation at the first stage may not be accurate. In this work speaker specific information is represented by using mel frequency cepstral coefficients (MFCCs), and it is captured by using Gaussian mixture models (GMMs). The proposed two-stage segmentation method is evaluated on manual segmented ten broadcast TV news bulletins. From the evaluation results, it is observed that about 93% of the news stories are correctly segmented, 7% are missed and 11% are spurious.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121721031","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176822
I. Mukherjee, A. Malewar, V. Gadre
This paper extends the steps for estimation of the number of target bits for the future frame during video encoding for an improved performance of the buffer which in turn reflects in a better reconstruction (peak signal-to-noise ratio). It includes two different approaches that consider the rate control module as a control system subjected to stability in terms of the target bits estimation error and thus yield benefits in terms of the buffer usage. It also proposes a possible way to take the work forward and formalize the methods to achieve optimal results.
{"title":"Effective estimation of target bits for rate control in video coding","authors":"I. Mukherjee, A. Malewar, V. Gadre","doi":"10.1109/NCC.2012.6176822","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176822","url":null,"abstract":"This paper extends the steps for estimation of the number of target bits for the future frame during video encoding for an improved performance of the buffer which in turn reflects in a better reconstruction (peak signal-to-noise ratio). It includes two different approaches that consider the rate control module as a control system subjected to stability in terms of the target bits estimation error and thus yield benefits in terms of the buffer usage. It also proposes a possible way to take the work forward and formalize the methods to achieve optimal results.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123221226","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176834
S. Narayanamurthy, S. Ramdaspalli, A. Jhunjhunwala, B. Ramamurthi
The number of BTS (Base transceiver stations) are increasing as the number of cellphone subscriber base is expanding and hence the need for analyzing the energy consumption of the constituents of the shelter becomes important. This paper briefly considers the various sources and loads at the telecom towers, introduces an simulation tool developed using Matlab, and ends by demonstrating alternate strategies to significantly reduce costs, energy consumption and carbon footprints.
{"title":"Rural base station powering","authors":"S. Narayanamurthy, S. Ramdaspalli, A. Jhunjhunwala, B. Ramamurthi","doi":"10.1109/NCC.2012.6176834","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176834","url":null,"abstract":"The number of BTS (Base transceiver stations) are increasing as the number of cellphone subscriber base is expanding and hence the need for analyzing the energy consumption of the constituents of the shelter becomes important. This paper briefly considers the various sources and loads at the telecom towers, introduces an simulation tool developed using Matlab, and ends by demonstrating alternate strategies to significantly reduce costs, energy consumption and carbon footprints.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124250262","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176755
M. F. Ali, S. Ray
Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to calculate Specific Absorption Rate (SAR) induced in the head and hand for a handheld mobile phone. Both the head and hand are modeled using Digital Imaging and Communication in Medicine (DICOM) based anthropomorphic phantom voxel data considering the electrical parameters of different anatomical internal structures of the human head and hand. SAR values obtained using DICOM based voxel model are compared with that obtained using Zubal phantom based model to verify the suitability of the proposed method. The proposed method can be used for person specific real time simulation of SAR.
{"title":"SAR analysis using DICOM based voxel model","authors":"M. F. Ali, S. Ray","doi":"10.1109/NCC.2012.6176755","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176755","url":null,"abstract":"Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to calculate Specific Absorption Rate (SAR) induced in the head and hand for a handheld mobile phone. Both the head and hand are modeled using Digital Imaging and Communication in Medicine (DICOM) based anthropomorphic phantom voxel data considering the electrical parameters of different anatomical internal structures of the human head and hand. SAR values obtained using DICOM based voxel model are compared with that obtained using Zubal phantom based model to verify the suitability of the proposed method. The proposed method can be used for person specific real time simulation of SAR.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127771741","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176818
P. Kaur, M. Uddin, A. Khosla
Low spectrum utilization and lack of spectrum for new wireless services led to think of unlicensed devices that may operate on spectrum holes as and when required with a constraint of preserving the rights of licensed users. Cognitive radios have been proposed as one of such promising solutions for increasing spectrum utilization and in turn helping to resolve spectrum scarcity problem. As the spectrum availability will differ in both time and space for such scenarios, dynamic spectrum allocation is considered as key enabling technique for the success of cognitive radios. This paper assumes a centralised architecture where the central controller maintains the record of all vacant spectrums and decides the spectrum to be allocated to particular users based on spectrum overlay strategy. We model the functionalities of media access based on distributed semi Markovian network of queues where the first queue is equivalent of sorting overlapped detections received from all SU in the network, updating its database, contention and conflict management. We call this queue as spectrum analysis queue. The requests once sorted will be considered for channel allocation which is modeled as channel allocation queue. This paper presents throughput analysis of unlicensed users for opportunistic spectrum access based bandwidth allocation where the paper first presents the formulation of access latency which is then used for evaluating the throughput of unlicensed users.
{"title":"Throughput analysis for opportunistic spectrum access among unlicensed devices","authors":"P. Kaur, M. Uddin, A. Khosla","doi":"10.1109/NCC.2012.6176818","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176818","url":null,"abstract":"Low spectrum utilization and lack of spectrum for new wireless services led to think of unlicensed devices that may operate on spectrum holes as and when required with a constraint of preserving the rights of licensed users. Cognitive radios have been proposed as one of such promising solutions for increasing spectrum utilization and in turn helping to resolve spectrum scarcity problem. As the spectrum availability will differ in both time and space for such scenarios, dynamic spectrum allocation is considered as key enabling technique for the success of cognitive radios. This paper assumes a centralised architecture where the central controller maintains the record of all vacant spectrums and decides the spectrum to be allocated to particular users based on spectrum overlay strategy. We model the functionalities of media access based on distributed semi Markovian network of queues where the first queue is equivalent of sorting overlapped detections received from all SU in the network, updating its database, contention and conflict management. We call this queue as spectrum analysis queue. The requests once sorted will be considered for channel allocation which is modeled as channel allocation queue. This paper presents throughput analysis of unlicensed users for opportunistic spectrum access based bandwidth allocation where the paper first presents the formulation of access latency which is then used for evaluating the throughput of unlicensed users.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126819092","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176857
Sayantan Hazra, Abhijit Mitra
A new satellite channel model with the exploitation of Nakagami-q and lognormal distribution is proposed. The complex channel process is taken as addition of small-scale faded scattered components and shadow faded line-of-sight (LOS) component of received signal in a land mobile satellite (LMS) channel. Analytical expressions for probability density function (pdf) and level crossing rate (LCR) are derived for the proposed model. Effect of different statistical parameters is reported with the results obtained from derived analytical formula. The results are also compared with the same obtained from other related channel models.
{"title":"A new land mobile satellite channel model with Nakagami-q distribution","authors":"Sayantan Hazra, Abhijit Mitra","doi":"10.1109/NCC.2012.6176857","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176857","url":null,"abstract":"A new satellite channel model with the exploitation of Nakagami-q and lognormal distribution is proposed. The complex channel process is taken as addition of small-scale faded scattered components and shadow faded line-of-sight (LOS) component of received signal in a land mobile satellite (LMS) channel. Analytical expressions for probability density function (pdf) and level crossing rate (LCR) are derived for the proposed model. Effect of different statistical parameters is reported with the results obtained from derived analytical formula. The results are also compared with the same obtained from other related channel models.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128182250","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176846
G. Murmu, S. Bhattacharya, N. Tare
In this paper, a transform domain LMS audio coder is presented where a transformed input is processed by a NLMS predictor. Three different transformations - Discrete Fourier transform (DFT), Discrete Cosine transform (DCT) and Discrete Wavelet transform (DWT) have been considered. The convergence performance of these predictors is observed with a synthesized music. The residuals of the predictors are coded and the coding efficiency of the Wavelet-based predictor is compared with predictors based on other transforms for synthesized music as well as for some real music signals. It is observed that audio coder with wavelet based predictor provides the least bit-rate in bits/sample. Besides this, the time complexity involved in prediction and coding using different transformations have been studied.
{"title":"A transform domain LMS audio coder","authors":"G. Murmu, S. Bhattacharya, N. Tare","doi":"10.1109/NCC.2012.6176846","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176846","url":null,"abstract":"In this paper, a transform domain LMS audio coder is presented where a transformed input is processed by a NLMS predictor. Three different transformations - Discrete Fourier transform (DFT), Discrete Cosine transform (DCT) and Discrete Wavelet transform (DWT) have been considered. The convergence performance of these predictors is observed with a synthesized music. The residuals of the predictors are coded and the coding efficiency of the Wavelet-based predictor is compared with predictors based on other transforms for synthesized music as well as for some real music signals. It is observed that audio coder with wavelet based predictor provides the least bit-rate in bits/sample. Besides this, the time complexity involved in prediction and coding using different transformations have been studied.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"04 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128217476","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176855
A. Sadhukhan, Sanjay Dhar Roy
In tactical communication systems, WLANs are very popular options due to their high data rate. Motivated by the work of [1], we investigate performance of newly developed signal strength ratio (SSR) based handoff algorithms in tactical communication systems using WLANs. We obtain better performance in terms of number of handoff, packet loss rate and throughput for SSR based handoff algorithms. Performance of average received signal strength based handoff algorithms has also been investigated for tactical WLAN systems.
{"title":"On the data performance in tactical WLAN with signal strength ratio based handoff algorithms","authors":"A. Sadhukhan, Sanjay Dhar Roy","doi":"10.1109/NCC.2012.6176855","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176855","url":null,"abstract":"In tactical communication systems, WLANs are very popular options due to their high data rate. Motivated by the work of [1], we investigate performance of newly developed signal strength ratio (SSR) based handoff algorithms in tactical communication systems using WLANs. We obtain better performance in terms of number of handoff, packet loss rate and throughput for SSR based handoff algorithms. Performance of average received signal strength based handoff algorithms has also been investigated for tactical WLAN systems.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128262267","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}
Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176852
Sooraj K. Ambat, S. Chatterjee, K. Hari
Compressive Sensing theory combines the signal sampling and compression for sparse signals resulting in reduction in sampling rate and computational complexity of the measurement system. In recent years, many recovery algorithms were proposed to reconstruct the signal efficiently. Look Ahead OMP (LAOMP) is a recently proposed method which uses a look ahead strategy and performs significantly better than other greedy methods. In this paper, we propose a modification to the LAOMP algorithm to choose the look ahead parameter L adaptively, thus reducing the complexity of the algorithm, without compromising on the performance. The performance of the algorithm is evaluated through Monte Carlo simulations.
{"title":"Adaptive selection of search space in look ahead orthogonal matching pursuit","authors":"Sooraj K. Ambat, S. Chatterjee, K. Hari","doi":"10.1109/NCC.2012.6176852","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176852","url":null,"abstract":"Compressive Sensing theory combines the signal sampling and compression for sparse signals resulting in reduction in sampling rate and computational complexity of the measurement system. In recent years, many recovery algorithms were proposed to reconstruct the signal efficiently. Look Ahead OMP (LAOMP) is a recently proposed method which uses a look ahead strategy and performs significantly better than other greedy methods. In this paper, we propose a modification to the LAOMP algorithm to choose the look ahead parameter L adaptively, thus reducing the complexity of the algorithm, without compromising on the performance. The performance of the algorithm is evaluated through Monte Carlo simulations.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128444069","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}
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