Pub Date : 2015-04-16DOI: 10.1109/NCC.2015.7084844
Abhijit Prakash Bhatnagar, A. Sehgal
Smart phone keyboards render a device based text prediction system which is usually built around the keyboard application under use. Withal, they infer a restriction since the techniques used in the system are mostly confined to device in scope. In this paper, we formulate a method to merge various user dictionaries so as to increase keystroke savings on average for a smart phone user. The method described in this paper takes into account relations among a multitude of users, and applies it to merge the user dictionary at a level derived from the relations. We show an increase in percentage keystroke savings for experimental data by applying this algorithm to context insensitive variation of word prediction.
{"title":"User dictionary merge for enhancing smart phone auto prediction","authors":"Abhijit Prakash Bhatnagar, A. Sehgal","doi":"10.1109/NCC.2015.7084844","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084844","url":null,"abstract":"Smart phone keyboards render a device based text prediction system which is usually built around the keyboard application under use. Withal, they infer a restriction since the techniques used in the system are mostly confined to device in scope. In this paper, we formulate a method to merge various user dictionaries so as to increase keystroke savings on average for a smart phone user. The method described in this paper takes into account relations among a multitude of users, and applies it to merge the user dictionary at a level derived from the relations. We show an increase in percentage keystroke savings for experimental data by applying this algorithm to context insensitive variation of word prediction.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130995295","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084833
Amrita Mardikar, R. Mohan, Mahima Arrawatia, G. Kumar
In this paper, a dual band planar dual circular ring monopole antenna is designed and fabricated on 1.6mm thick FR4 substrate. The measured bandwidth of the antenna is from 0.82-1.25 GHz and 1.65-2.79 GHz for return loss <; -10dB. This antenna finds its application in CDMA, GSM900, GSM1800, 3G, 4G and Wi-Fi bands. A uniform omnidirectional radiation pattern is also obtained over the entire bandwidth. The maximum gain of the designed antenna is 3.7dBi.
{"title":"Dual band dual circular ring monopole antenna","authors":"Amrita Mardikar, R. Mohan, Mahima Arrawatia, G. Kumar","doi":"10.1109/NCC.2015.7084833","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084833","url":null,"abstract":"In this paper, a dual band planar dual circular ring monopole antenna is designed and fabricated on 1.6mm thick FR4 substrate. The measured bandwidth of the antenna is from 0.82-1.25 GHz and 1.65-2.79 GHz for return loss <; -10dB. This antenna finds its application in CDMA, GSM900, GSM1800, 3G, 4G and Wi-Fi bands. A uniform omnidirectional radiation pattern is also obtained over the entire bandwidth. The maximum gain of the designed antenna is 3.7dBi.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126063233","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084856
R. Sriranjani, M. Reddy, S. Umesh
Dysarthria is a neuromuscular disorder, occurs due to improper coordination of speech musculature. In order to improve the quality of life of people with speech disorder, assistive technology using automatic speech recognition (ASR) systems are gaining importance. Since it is difficult for dysarthric speakers to provide sufficient data, data insufficiency is one of the major problems in building an efficient dysarthric ASR system. In this paper, we focus on handling this issue by pooling data from unimpaired speech database. Then feature space maximum likelihood linear regression (fMLLR) transformation is applied on pooled data and dysarthric data to normalize the effect of inter-speaker variability. The acoustic model built using the combined features (acoustically transformed dysarthric + pooled features) gives an relative improvement of 18.09% and 50.00% over baseline system for Nemours database and Universal Access speech (digit set) database.
{"title":"Improved acoustic modeling for automatic dysarthric speech recognition","authors":"R. Sriranjani, M. Reddy, S. Umesh","doi":"10.1109/NCC.2015.7084856","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084856","url":null,"abstract":"Dysarthria is a neuromuscular disorder, occurs due to improper coordination of speech musculature. In order to improve the quality of life of people with speech disorder, assistive technology using automatic speech recognition (ASR) systems are gaining importance. Since it is difficult for dysarthric speakers to provide sufficient data, data insufficiency is one of the major problems in building an efficient dysarthric ASR system. In this paper, we focus on handling this issue by pooling data from unimpaired speech database. Then feature space maximum likelihood linear regression (fMLLR) transformation is applied on pooled data and dysarthric data to normalize the effect of inter-speaker variability. The acoustic model built using the combined features (acoustically transformed dysarthric + pooled features) gives an relative improvement of 18.09% and 50.00% over baseline system for Nemours database and Universal Access speech (digit set) database.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126955315","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084903
Ankur Bansal, P. Sharma, M. Bhatnagar
In this paper, we analyze a free space optical (FSO) cooperative communication system utilizing the Gamma-Gamma fading optical links and a single decode-and-forward (DF) erroneous relay. We adopt the subcarrier intensity modulation (SIM) technique for transmission of the binary phase shift keying (BPSK) modulated data over an optical link. For the considered DF-FSO cooperative system, we derive a maximum-likelihood (ML) decoder and a sub-optimal piecewise linear (PL) decoder in the destination of the system. The proposed PL decoder performs very close to the ML decoder with a significant reduction in the decoding complexity. Both the ML and the PL decoders incorporate the possibility of erroneous transmission by the DF relay and require the average statistics of the source-relay link for decoding the data of the source in the destination. Moreover, we also derive the closed-form expression for the average bit error rate (BER) of the proposed PL decoder.
{"title":"Optimal and suboptimal decoding for SIM-BPSK over Gamma-Gamma FSO links with an erroneous relay","authors":"Ankur Bansal, P. Sharma, M. Bhatnagar","doi":"10.1109/NCC.2015.7084903","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084903","url":null,"abstract":"In this paper, we analyze a free space optical (FSO) cooperative communication system utilizing the Gamma-Gamma fading optical links and a single decode-and-forward (DF) erroneous relay. We adopt the subcarrier intensity modulation (SIM) technique for transmission of the binary phase shift keying (BPSK) modulated data over an optical link. For the considered DF-FSO cooperative system, we derive a maximum-likelihood (ML) decoder and a sub-optimal piecewise linear (PL) decoder in the destination of the system. The proposed PL decoder performs very close to the ML decoder with a significant reduction in the decoding complexity. Both the ML and the PL decoders incorporate the possibility of erroneous transmission by the DF relay and require the average statistics of the source-relay link for decoding the data of the source in the destination. Moreover, we also derive the closed-form expression for the average bit error rate (BER) of the proposed PL decoder.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126690121","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084898
Vijay Rao, P. PriyeshP, Subrat Kar
A novel communication protocol - Adaptive Transmission Power Protocol - for Wireless Sensor Networks with the facility of reconfiguring the transmission power of the hardware is presented. Specifications of the protocol including the packet format and the contention avoidance methods are described. The protocol is implemented on a hardware platform and the performance is considered for a fundamental operation. The results show that non-overlapping regions exist for different transmission power levels where the system performance is optimum. More importantly, these regions move farther from the node with increase in transmission power level. It is observed that reconfiguring transmission power levels is an effective way of saving energy in Wireless Sensor Networks, the operation of which is abstracted by the implementation of the Adaptive Transmission Power Protocol.
{"title":"Adaptive Transmission Power Protocol for heterogeneous Wireless Sensor Networks","authors":"Vijay Rao, P. PriyeshP, Subrat Kar","doi":"10.1109/NCC.2015.7084898","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084898","url":null,"abstract":"A novel communication protocol - Adaptive Transmission Power Protocol - for Wireless Sensor Networks with the facility of reconfiguring the transmission power of the hardware is presented. Specifications of the protocol including the packet format and the contention avoidance methods are described. The protocol is implemented on a hardware platform and the performance is considered for a fundamental operation. The results show that non-overlapping regions exist for different transmission power levels where the system performance is optimum. More importantly, these regions move farther from the node with increase in transmission power level. It is observed that reconfiguring transmission power levels is an effective way of saving energy in Wireless Sensor Networks, the operation of which is abstracted by the implementation of the Adaptive Transmission Power Protocol.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122494595","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084915
Saptarshi Ghosh, T. Acharya, Subhankar Chatterjee, S. Maity
In this paper, the problem of joint spectrum sensing and data transmission in a two-user cooperative cognitive radio network is studied. Tractable solution for optimal power allocation is proposed for cognitive sources for both sensing and data transmission slots with an aim to maximize sum throughput of the system while meeting the constraints of probability of detection of PU's signal and total transmission power. Simulation results verify that there exists optimal power sharing factors both for sensing and data transmission slots to maximize the system throughput. Furthermore, performance gain in term of achievable system throughput is noted when the proposed scheme is compared with equal power allocation scheme operated under total power constraint scenario.
{"title":"On optimal power sharing for joint sensing and data transmission in cooperative cognitive radio networks","authors":"Saptarshi Ghosh, T. Acharya, Subhankar Chatterjee, S. Maity","doi":"10.1109/NCC.2015.7084915","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084915","url":null,"abstract":"In this paper, the problem of joint spectrum sensing and data transmission in a two-user cooperative cognitive radio network is studied. Tractable solution for optimal power allocation is proposed for cognitive sources for both sensing and data transmission slots with an aim to maximize sum throughput of the system while meeting the constraints of probability of detection of PU's signal and total transmission power. Simulation results verify that there exists optimal power sharing factors both for sensing and data transmission slots to maximize the system throughput. Furthermore, performance gain in term of achievable system throughput is noted when the proposed scheme is compared with equal power allocation scheme operated under total power constraint scenario.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116107372","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084908
V. Gokhale, S. Chaudhuri, O. Dabeer
Telehaptics applications are usually characterized by a strict imposition of a round trip haptic data latency of less than 30 ms. In this paper, we present Haptics over Internet Protocol (HoIP) - a low latency application layer protocol that enables haptic, audio and video data transmission over a network between two remotely connected nodes. The evaluation of the protocol is carried out through a set of three experiments, each with distinct objectives. First, a haptic-audio-visual (HAV) interactive application, involving two remotely located human personnel communicating via haptic, auditory and visual media, to evaluate the Quality of Service (QoS) violation due to the protocol. Second, a haptic sawing experiment with the goal of assessing the impact of HoIP and network delays in telehaptics applications, by taking the example of a typical telesurgical activity. Third, a telepottery system to determine the protocol's ability in reproducing a real-time interactive user experience with a remote virtual object, in presence of perceptual data compression and reconstruction techniques. Our experiments reveal that the transmission scheduling of multimedia packets performs well in terms of maintaining the latencies well under the QoS thresholds.
{"title":"HoIP: A point-to-point haptic data communication protocol and its evaluation","authors":"V. Gokhale, S. Chaudhuri, O. Dabeer","doi":"10.1109/NCC.2015.7084908","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084908","url":null,"abstract":"Telehaptics applications are usually characterized by a strict imposition of a round trip haptic data latency of less than 30 ms. In this paper, we present Haptics over Internet Protocol (HoIP) - a low latency application layer protocol that enables haptic, audio and video data transmission over a network between two remotely connected nodes. The evaluation of the protocol is carried out through a set of three experiments, each with distinct objectives. First, a haptic-audio-visual (HAV) interactive application, involving two remotely located human personnel communicating via haptic, auditory and visual media, to evaluate the Quality of Service (QoS) violation due to the protocol. Second, a haptic sawing experiment with the goal of assessing the impact of HoIP and network delays in telehaptics applications, by taking the example of a typical telesurgical activity. Third, a telepottery system to determine the protocol's ability in reproducing a real-time interactive user experience with a remote virtual object, in presence of perceptual data compression and reconstruction techniques. Our experiments reveal that the transmission scheduling of multimedia packets performs well in terms of maintaining the latencies well under the QoS thresholds.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117052285","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084825
Ashish Gupta, S. K. Sharma, R. Chaudhary
In this paper a compact planar CPW-fed metamaterial antenna with closed ring resonator (CRR) has been proposed. It is observed that by employing CRR into the structure an extra band is found at 2.17 GHz (n = -1 mode) and therefore electrical size of the antenna is decreased significantly. CPW- feed is introduced to enhance the bandwidth and radiation efficiency of proposed antenna. This antenna is operated at 2.15 - 2.19 GHz and 3.2 - 5.25 GHz, at the center frequency 4.23 GHz. It achieves peak antenna gain of 2.97 dB and radiation efficiency upto 97%. In addition to that proposed antenna shows consistent radiation patterns throughout the bandwidth.
{"title":"A compact CPW-fed metamaterial antenna for high efficiency and wideband applications","authors":"Ashish Gupta, S. K. Sharma, R. Chaudhary","doi":"10.1109/NCC.2015.7084825","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084825","url":null,"abstract":"In this paper a compact planar CPW-fed metamaterial antenna with closed ring resonator (CRR) has been proposed. It is observed that by employing CRR into the structure an extra band is found at 2.17 GHz (n = -1 mode) and therefore electrical size of the antenna is decreased significantly. CPW- feed is introduced to enhance the bandwidth and radiation efficiency of proposed antenna. This antenna is operated at 2.15 - 2.19 GHz and 3.2 - 5.25 GHz, at the center frequency 4.23 GHz. It achieves peak antenna gain of 2.97 dB and radiation efficiency upto 97%. In addition to that proposed antenna shows consistent radiation patterns throughout the bandwidth.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114394540","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084838
R. Jana, R. Bhattacharjee
The cross polar power resulting due to illumination of an offset reflector by a linearly polarized circular feed operating in TE11 mode can be suppressed considerably by employing TE21 and TM11 modes having proper mode coefficients and relative phases. This paper presents the design and performance evaluation of such a smooth walled circular tri-mode matched feed. Using an analytical pattern for the tri-mode feed and physical optics (PO) for computation of far field, mode coefficients and relative phases are estimated using particle swarm optimization (PSO) technique. Through a parametric study in HFSS, matched feed dimensions to achieve required mode coefficients and phases at the design frequency are determined. HFSS is used to evaluate the performance of the matched feed in terms of cross-polarization and beam squinting. A -30 dB cross-polar bandwidth of 2.73% is achieved at the design frequency.
{"title":"A tri-mode low cross-polarized circular matched feed for offset reflector antenna system","authors":"R. Jana, R. Bhattacharjee","doi":"10.1109/NCC.2015.7084838","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084838","url":null,"abstract":"The cross polar power resulting due to illumination of an offset reflector by a linearly polarized circular feed operating in TE11 mode can be suppressed considerably by employing TE21 and TM11 modes having proper mode coefficients and relative phases. This paper presents the design and performance evaluation of such a smooth walled circular tri-mode matched feed. Using an analytical pattern for the tri-mode feed and physical optics (PO) for computation of far field, mode coefficients and relative phases are estimated using particle swarm optimization (PSO) technique. Through a parametric study in HFSS, matched feed dimensions to achieve required mode coefficients and phases at the design frequency are determined. HFSS is used to evaluate the performance of the matched feed in terms of cross-polarization and beam squinting. A -30 dB cross-polar bandwidth of 2.73% is achieved at the design frequency.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116134670","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 : 2015-04-16DOI: 10.1109/NCC.2015.7084880
K. SaikrishnaReddy, D. Venkitesh, C. Browning, L. Barry
Intensity modulation direct detection orthogonal frequency division multiplexing based passive optical network is experimentally demonstrated at data rates of up to 30 Gbps. Error-free performance is achieved for a propagation length of up to 40 km with a spectral efficiency of 1.9 b/s/Hz. Pre-emphasis technique is used to counter the performance degradation in the direct detection system. A semiconductor optical amplifier is used at the remote node stage to increase the power budget of the passive optical network. Split ratios up to 1 × 256 are achieved after 25 km fiber at 30 Gbps down stream data rates.
{"title":"Demonstration of a 30 Gbps intensity modulation direct detection OFDM-based passive optical network","authors":"K. SaikrishnaReddy, D. Venkitesh, C. Browning, L. Barry","doi":"10.1109/NCC.2015.7084880","DOIUrl":"https://doi.org/10.1109/NCC.2015.7084880","url":null,"abstract":"Intensity modulation direct detection orthogonal frequency division multiplexing based passive optical network is experimentally demonstrated at data rates of up to 30 Gbps. Error-free performance is achieved for a propagation length of up to 40 km with a spectral efficiency of 1.9 b/s/Hz. Pre-emphasis technique is used to counter the performance degradation in the direct detection system. A semiconductor optical amplifier is used at the remote node stage to increase the power budget of the passive optical network. Split ratios up to 1 × 256 are achieved after 25 km fiber at 30 Gbps down stream data rates.","PeriodicalId":302718,"journal":{"name":"2015 Twenty First National Conference on Communications (NCC)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116198693","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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