Pub Date : 2012-04-03DOI: 10.1109/NCC.2012.6176888
V. Upadhya, D. Jalihal
Design of robust test statistics which mitigate the channel and noise uncertainties are the essential requirement of detection applications. Covariance absolute value (CAV) detection is one of the non-parametric detection methods which claims robustness [1]. Achieving the theoretical probability of detection performance depends on the accuracy in calculating the thresholding parameter, which in turn depends on the distribution of the test statistic under the null hypothesis. Since the exact analysis of distribution is cumbersome, approximation techniques are used. We present approximation techniques which achieve performance very close to the one obtained from exact distribution of the test statistic (using Monte-Carlo simulation). Further, an equivalent test statistic compared to CAV is proposed which uses the Bartlett decomposition of the sample covariance matrix and its performance is compared with CAV. The robustness of the proposed test statistic is verified for the noise uncertainty model assumed [2].
{"title":"Almost exact threshold calculations for covariance absolute value detection algorithm","authors":"V. Upadhya, D. Jalihal","doi":"10.1109/NCC.2012.6176888","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176888","url":null,"abstract":"Design of robust test statistics which mitigate the channel and noise uncertainties are the essential requirement of detection applications. Covariance absolute value (CAV) detection is one of the non-parametric detection methods which claims robustness [1]. Achieving the theoretical probability of detection performance depends on the accuracy in calculating the thresholding parameter, which in turn depends on the distribution of the test statistic under the null hypothesis. Since the exact analysis of distribution is cumbersome, approximation techniques are used. We present approximation techniques which achieve performance very close to the one obtained from exact distribution of the test statistic (using Monte-Carlo simulation). Further, an equivalent test statistic compared to CAV is proposed which uses the Bartlett decomposition of the sample covariance matrix and its performance is compared with CAV. The robustness of the proposed test statistic is verified for the noise uncertainty model assumed [2].","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"29 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":"133831169","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.2012.6176858
R. Agarwal, R. Gangopadhyay, S. Mishra, S. Gupta
We have proposed and analyzed receiver architecture for an optical differential quadrature phase-shift-keying (oDQPSK) based on micro-ring resonator (MRR) filter discriminator and direct detection. The simulation results confirm that such an MRR based receiver provides considerable tolerance to chromatic dispersion as well as the nonlinear self-phase modulation (SPM) effect compared to the receiver architectures based on delay interferometer as well as the Gaussian filter type demodulators.
{"title":"Group velocity dispersion and nonlinearity tolerance of micro-ring resonator based filter demodulator for DQPSK signal","authors":"R. Agarwal, R. Gangopadhyay, S. Mishra, S. Gupta","doi":"10.1109/NCC.2012.6176858","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176858","url":null,"abstract":"We have proposed and analyzed receiver architecture for an optical differential quadrature phase-shift-keying (oDQPSK) based on micro-ring resonator (MRR) filter discriminator and direct detection. The simulation results confirm that such an MRR based receiver provides considerable tolerance to chromatic dispersion as well as the nonlinear self-phase modulation (SPM) effect compared to the receiver architectures based on delay interferometer as well as the Gaussian filter type demodulators.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"186 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":"116062866","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.2012.6176817
N. Sood, P. Sen
The paper describes the effect of using different reference oscillator frequencies in a PLL circuit. Driving the PLL circuit with reference oscillator at different frequencies results in varied phase noise performance. The objective is to find out the reference frequencies along with other related parameters at different conditions thus yielding minimized spurs and optimal phase noise of the PLL system. The results can provide a guideline on the oscillator frequency selection resulting in improvising the phase noise characteristics of the PLL system along with its trade-off with the minimization of reference spurs.
{"title":"Optimization of phase noise in a PLL circuit design","authors":"N. Sood, P. Sen","doi":"10.1109/NCC.2012.6176817","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176817","url":null,"abstract":"The paper describes the effect of using different reference oscillator frequencies in a PLL circuit. Driving the PLL circuit with reference oscillator at different frequencies results in varied phase noise performance. The objective is to find out the reference frequencies along with other related parameters at different conditions thus yielding minimized spurs and optimal phase noise of the PLL system. The results can provide a guideline on the oscillator frequency selection resulting in improvising the phase noise characteristics of the PLL system along with its trade-off with the minimization of reference spurs.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"44 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":"116397900","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.2012.6176819
S. Bandyopadhyay, S. Nadaf
Reduction of packet loss in communication network by modifying the transmit queue length is an important research topic. A cross layer aware transmission queue adaptation system of a fixed computing system having multiple physical interfaces is presented here. The proposed system determines the condition of communication channel/network associated with the multiple physical interfaces while transmitting and receiving the data simultaneously through the interfaces. The core functional blocks of the proposed cross layer system modifies the transmission queue length of the active physical interfaces based on their dynamic network condition, and available bandwidth. It does not require any feedback mechanism, as well as intervention of any router or any proxy node. The experimental results show the enhancement in throughput and hence the QoS by using the proposed transmission queue adaptation mechanism using multiple interfaces. A future scope of the present work in detail is also presented here.
{"title":"A novel crosslayer-aware transmission queue adaptation system using multiple physical links","authors":"S. Bandyopadhyay, S. Nadaf","doi":"10.1109/NCC.2012.6176819","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176819","url":null,"abstract":"Reduction of packet loss in communication network by modifying the transmit queue length is an important research topic. A cross layer aware transmission queue adaptation system of a fixed computing system having multiple physical interfaces is presented here. The proposed system determines the condition of communication channel/network associated with the multiple physical interfaces while transmitting and receiving the data simultaneously through the interfaces. The core functional blocks of the proposed cross layer system modifies the transmission queue length of the active physical interfaces based on their dynamic network condition, and available bandwidth. It does not require any feedback mechanism, as well as intervention of any router or any proxy node. The experimental results show the enhancement in throughput and hence the QoS by using the proposed transmission queue adaptation mechanism using multiple interfaces. A future scope of the present work in detail is also presented here.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"39 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":"124946322","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.2012.6176851
R. R. Vempada, B. Kumar, K. S. Rao
In this paper, spectral and prosodic features are explored for recognition of infant cry. Different types of infant cries considered in this work are wet-diaper, hunger and pain. In this work, mel-frequency cepstral coefficients (MFCC) are used to represent the spectral information, and short-time frame energies (STE) and pause duration are used for representing the prosodic information. Support Vector Machines (SVM) are used to capture the discriminative information with respect to above mentioned cries from the spectral and prosodic features. SVM models are developed seperately using spectral and prosodic features. For carrying out these studies, infant cry database collected under Telemedicine project at IIT-KGP has been used. The recognition performance of the developed SVM models using spectral and prosodic features is observed to be 61.11% and 57.41% respectively. In this work, we also examined the recognition performance by combining the spectral and prosodic information at feature and score levels. The recognition performance using feature and score level fusion is observed to be 74.07% and 80.56% respectively.
{"title":"Characterization of infant cries using spectral and prosodic features","authors":"R. R. Vempada, B. Kumar, K. S. Rao","doi":"10.1109/NCC.2012.6176851","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176851","url":null,"abstract":"In this paper, spectral and prosodic features are explored for recognition of infant cry. Different types of infant cries considered in this work are wet-diaper, hunger and pain. In this work, mel-frequency cepstral coefficients (MFCC) are used to represent the spectral information, and short-time frame energies (STE) and pause duration are used for representing the prosodic information. Support Vector Machines (SVM) are used to capture the discriminative information with respect to above mentioned cries from the spectral and prosodic features. SVM models are developed seperately using spectral and prosodic features. For carrying out these studies, infant cry database collected under Telemedicine project at IIT-KGP has been used. The recognition performance of the developed SVM models using spectral and prosodic features is observed to be 61.11% and 57.41% respectively. In this work, we also examined the recognition performance by combining the spectral and prosodic information at feature and score levels. The recognition performance using feature and score level fusion is observed to be 74.07% and 80.56% respectively.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"12 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":"128238236","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.2012.6176810
R. Raha
High frequency (HF), (3-30)MHz, and Very high frequency (VHF), (30-300)MHz, radio are the backbones of communication systems from many years. They are playing a major role in country wide communication system. Unfortunately there is no direct interface between these two radio frequencies. A lot of research work had been done to create a cross patch between HF radio and VHF radio. The search for a complete solution for this cross patch circuit is still in progress. The idea in this paper is to design at least two versions of crosspatch circuits with different mechanisms and have a comparative study between these circuits to find out which one is better. The Crosspatch circuits would be a two way communicating circuit to interface between HF and VHF frequency ranges, and will not depend on any external signal rather will take the help of an internal signal to provide the interfacing.
{"title":"Designing a patch system to interface between HF and VHF radios","authors":"R. Raha","doi":"10.1109/NCC.2012.6176810","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176810","url":null,"abstract":"High frequency (HF), (3-30)MHz, and Very high frequency (VHF), (30-300)MHz, radio are the backbones of communication systems from many years. They are playing a major role in country wide communication system. Unfortunately there is no direct interface between these two radio frequencies. A lot of research work had been done to create a cross patch between HF radio and VHF radio. The search for a complete solution for this cross patch circuit is still in progress. The idea in this paper is to design at least two versions of crosspatch circuits with different mechanisms and have a comparative study between these circuits to find out which one is better. The Crosspatch circuits would be a two way communicating circuit to interface between HF and VHF frequency ranges, and will not depend on any external signal rather will take the help of an internal signal to provide the interfacing.","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":"128756476","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.2012.6176767
S. U. Rani, R. Manivasakan
This paper discusses the condition under which the jitter buffer at the receiver is to be operated for minimum output variance in a TDMoIP framework. The above study would be useful in the design of synchronization algorithms at the receiver of a TDMoIP network. This work uses the results derived in [1] to the above problem. We model the receiver jitter buffer as a M/G/1 queueing system with EARMA correlations between the inter-arrival times and the service times. The motivation for the above correlation structure is that, if the service intervals depend on the arrival rate and there is correlation within service times, we can achieve a constant bit rate at the receiver, that is, emulate the TDM stream as it was sent at the transmitter. Also, analysis of such a correlated queue is analytically tractable. We derived the variance of the inter departure times, of the above queue. The analysis of the departure process and the waiting times of incoming packets of this correlated queue and the relevant simulations show that if the variance of the inter departure time process constituting output TDM stream is to be less than that of the inter arrival time process of the jitter buffer, which is modeled as M/G/1 queue, then the mean waiting time of the packets in the jitter buffer would necessarily be greater than that of independent (M/M/1) case.
{"title":"On the departure process of jitter buffer in TDMoIP","authors":"S. U. Rani, R. Manivasakan","doi":"10.1109/NCC.2012.6176767","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176767","url":null,"abstract":"This paper discusses the condition under which the jitter buffer at the receiver is to be operated for minimum output variance in a TDMoIP framework. The above study would be useful in the design of synchronization algorithms at the receiver of a TDMoIP network. This work uses the results derived in [1] to the above problem. We model the receiver jitter buffer as a M/G/1 queueing system with EARMA correlations between the inter-arrival times and the service times. The motivation for the above correlation structure is that, if the service intervals depend on the arrival rate and there is correlation within service times, we can achieve a constant bit rate at the receiver, that is, emulate the TDM stream as it was sent at the transmitter. Also, analysis of such a correlated queue is analytically tractable. We derived the variance of the inter departure times, of the above queue. The analysis of the departure process and the waiting times of incoming packets of this correlated queue and the relevant simulations show that if the variance of the inter departure time process constituting output TDM stream is to be less than that of the inter arrival time process of the jitter buffer, which is modeled as M/G/1 queue, then the mean waiting time of the packets in the jitter buffer would necessarily be greater than that of independent (M/M/1) case.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"83 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":"124615501","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.2012.6176829
A. Jayan, P. C. Pandey
Increasing the intensity of the consonant segments relative to the nearby vowel segments, known as consonant-vowel ratio (CVR) modification, is reported to be effective in improving perception of stop consonants for listeners in noisy backgrounds and for hearing-impaired listeners. A technique for automated CVR modification using detection of acoustic landmarks corresponding to the stop release bursts, with high temporal accuracy, is investigated. Its effectiveness in improving perception of stop consonants in the presence of speech-spectrum shaped noise is evaluated by conducting listening tests on five normal-hearing subjects with VCV utterances involving six stop consonants and three vowels. The processing improved the recognition scores for stop consonants by nearly 7, 18, and 25% at SNR levels of 0, -6, and -12 dB, respectively.
{"title":"Automated CVR modification for improving perception of stop consonants","authors":"A. Jayan, P. C. Pandey","doi":"10.1109/NCC.2012.6176829","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176829","url":null,"abstract":"Increasing the intensity of the consonant segments relative to the nearby vowel segments, known as consonant-vowel ratio (CVR) modification, is reported to be effective in improving perception of stop consonants for listeners in noisy backgrounds and for hearing-impaired listeners. A technique for automated CVR modification using detection of acoustic landmarks corresponding to the stop release bursts, with high temporal accuracy, is investigated. Its effectiveness in improving perception of stop consonants in the presence of speech-spectrum shaped noise is evaluated by conducting listening tests on five normal-hearing subjects with VCV utterances involving six stop consonants and three vowels. The processing improved the recognition scores for stop consonants by nearly 7, 18, and 25% at SNR levels of 0, -6, and -12 dB, respectively.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"15 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":"125559777","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.2012.6176912
Manjunath Kashyap Jataprolu, R. D. Koilpillai, S. Bhashyam
Cognitive radio based systems rely on spectrum sensing techniques to detect whitespaces to exploit. For the sake of ease of implementation, simple schemes such as energy detector have been proposed and studied widely. However, such simple schemes perform far from optimally, thereby affecting the performance of the underlying system. On the other hand sophisticated detectors are difficult to implement, giving rise to a trade-off. This paper explores the idea of using spectral estimates for detection. The case of HDTV based cognitive radio is explored and an optimal detection scheme following multi taper estimation is proposed and studied.
{"title":"Optimal MTM spectral estimation based detection for cognitive radio in HDTV","authors":"Manjunath Kashyap Jataprolu, R. D. Koilpillai, S. Bhashyam","doi":"10.1109/NCC.2012.6176912","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176912","url":null,"abstract":"Cognitive radio based systems rely on spectrum sensing techniques to detect whitespaces to exploit. For the sake of ease of implementation, simple schemes such as energy detector have been proposed and studied widely. However, such simple schemes perform far from optimally, thereby affecting the performance of the underlying system. On the other hand sophisticated detectors are difficult to implement, giving rise to a trade-off. This paper explores the idea of using spectral estimates for detection. The case of HDTV based cognitive radio is explored and an optimal detection scheme following multi taper estimation is proposed and studied.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"33 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":"125604116","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.2012.6176795
N. R. Guhagarkar, Rafi Ahamed Shaik
The key to high performance of MPEG-4 video compression lies in an efficient reduction of spatial and temporal redundancy. The main idea of inter prediction techniques is quick checking of the entire search area with efficient matching criterion viz. sum of absolute difference to eliminate the impossible or least matched candidates, followed by finer selection among the potentially best matched candidates. The macroblock with least SAD value will decide the motion vector. Due to object-based nature of MPEG-4, new SAD design with efficient computational ability, less area and less power in 0.18μm CMOS technology and operating frequency of 1.508GHz is proposed in the following paper.
{"title":"A high-performance architectural design for motion estimation in MPEG-4","authors":"N. R. Guhagarkar, Rafi Ahamed Shaik","doi":"10.1109/NCC.2012.6176795","DOIUrl":"https://doi.org/10.1109/NCC.2012.6176795","url":null,"abstract":"The key to high performance of MPEG-4 video compression lies in an efficient reduction of spatial and temporal redundancy. The main idea of inter prediction techniques is quick checking of the entire search area with efficient matching criterion viz. sum of absolute difference to eliminate the impossible or least matched candidates, followed by finer selection among the potentially best matched candidates. The macroblock with least SAD value will decide the motion vector. Due to object-based nature of MPEG-4, new SAD design with efficient computational ability, less area and less power in 0.18μm CMOS technology and operating frequency of 1.508GHz is proposed in the following paper.","PeriodicalId":178278,"journal":{"name":"2012 National Conference on Communications (NCC)","volume":"9 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":"125985513","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：