Pub Date : 2011-03-24DOI: 10.1109/ICCSP.2011.5739311
V.K. Muhammed Ajeer, P. Neelakantan, A. Babu
In this paper, we study the connectivity of a Vehicular Ad hoc Network (VANET) formed between vehicles that move on a highway. Analytical model to determine the network connectivity of VANET is presented, assuming that the speed of vehicles follow normal distribution. We bring out the exact dependence of vehicle speed statistics on VANET connectivity. We also present the dependence of vehicle speed statistics on both the node isolation probability as well as the critical transmission range required to maintain the desired connectivity probability. The results show that when the vehicle transmission range increases, the network connectivity also gets increased. The results also show that the network connectivity gets degraded when the average vehicle speed increases. Further, as the average speed increases, the critical transmission range required to meet a given connectivity probability criterion increases. On the other hand, when the standard deviation of vehicle speed increases, the network connectivity gets improved. It is also shown that, for a given connectivity probability requirement, the critical transmission range decreases as the standard deviation of the speed increases.
{"title":"Network connectivity of one-dimensional Vehicular Ad hoc Network","authors":"V.K. Muhammed Ajeer, P. Neelakantan, A. Babu","doi":"10.1109/ICCSP.2011.5739311","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739311","url":null,"abstract":"In this paper, we study the connectivity of a Vehicular Ad hoc Network (VANET) formed between vehicles that move on a highway. Analytical model to determine the network connectivity of VANET is presented, assuming that the speed of vehicles follow normal distribution. We bring out the exact dependence of vehicle speed statistics on VANET connectivity. We also present the dependence of vehicle speed statistics on both the node isolation probability as well as the critical transmission range required to maintain the desired connectivity probability. The results show that when the vehicle transmission range increases, the network connectivity also gets increased. The results also show that the network connectivity gets degraded when the average vehicle speed increases. Further, as the average speed increases, the critical transmission range required to meet a given connectivity probability criterion increases. On the other hand, when the standard deviation of vehicle speed increases, the network connectivity gets improved. It is also shown that, for a given connectivity probability requirement, the critical transmission range decreases as the standard deviation of the speed increases.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126748628","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739405
Chandrika Sudhendra, Vibhor Mahule, A. Pillai, A. Mohanty
We report novel resistor grid network based space cloth for application in single and multi layer radar absorbers. The space cloth is analyzed and relations are derived for the sheet resistance in terms of the resistor in the grid network. Design curves are drawn using MATLAB and the space cloth is analyzed using HFSS™ software in a Salisbury screen for S, C and X bands. Next, prediction and simulation results for a three layer Jaumann absorber using square grid resistor network with a Radar Cross Section Reduction (RCSR) of −15 dB over C, X and Ku bands is reported. The simulation results are encouraging and have led to the fabrication of prototype broadband radar absorber and experimental work is under progress.
{"title":"A novel space cloth using resistor grid network for radar absorbers in stealth applications","authors":"Chandrika Sudhendra, Vibhor Mahule, A. Pillai, A. Mohanty","doi":"10.1109/ICCSP.2011.5739405","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739405","url":null,"abstract":"We report novel resistor grid network based space cloth for application in single and multi layer radar absorbers. The space cloth is analyzed and relations are derived for the sheet resistance in terms of the resistor in the grid network. Design curves are drawn using MATLAB and the space cloth is analyzed using HFSS™ software in a Salisbury screen for S, C and X bands. Next, prediction and simulation results for a three layer Jaumann absorber using square grid resistor network with a Radar Cross Section Reduction (RCSR) of −15 dB over C, X and Ku bands is reported. The simulation results are encouraging and have led to the fabrication of prototype broadband radar absorber and experimental work is under progress.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124835178","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739403
T. Pham, R. Kohno
Multiple-input multiple-output (MIMO) repeater systems have been discussed in several published papers. When a repeater has only one antenna element, the propagation environment is called keyhole. In this kind of scenario the achievable channel capacity and link quality are decreased. Another limit is when the number of the antenna elements of a repeater is larger than that of a MIMO transceiver, the channel capacity cannot be increased. In this paper, in order to obtain high channel capacity, the repeaters are distributed in series. We optimize the position of each repeater for upper bound of channel capacity with each number of repeaters, and the upper bound of channel capacity when the number of repeater is assumed to be infinite.
{"title":"Bound of capacity in distributed MIMO repeater system with AF method","authors":"T. Pham, R. Kohno","doi":"10.1109/ICCSP.2011.5739403","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739403","url":null,"abstract":"Multiple-input multiple-output (MIMO) repeater systems have been discussed in several published papers. When a repeater has only one antenna element, the propagation environment is called keyhole. In this kind of scenario the achievable channel capacity and link quality are decreased. Another limit is when the number of the antenna elements of a repeater is larger than that of a MIMO transceiver, the channel capacity cannot be increased. In this paper, in order to obtain high channel capacity, the repeaters are distributed in series. We optimize the position of each repeater for upper bound of channel capacity with each number of repeaters, and the upper bound of channel capacity when the number of repeater is assumed to be infinite.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123676842","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739380
N. Pandey, P. Arora, S. Kapur, S. Malhotra
This paper for the first time presents a novel voltage mode (VM) resistor less first order all pass filter employing multiple-output current controlled current conveyor transconductance amplifier (MO-CCCCTA).The proposed circuit employs only one active element and one truly (not virtually) grounded capacitor. The angular pole frequency of the filter can be electronically tuned with the help of bias current. The proposed circuit is very appropriate to further develop into an integrated circuit. Sensitivity study of the circuit is provided and SPICE simulations have been included to verify the workability of the proposed circuit.
{"title":"First order voltage mode MO-CCCCTA based all pass filter","authors":"N. Pandey, P. Arora, S. Kapur, S. Malhotra","doi":"10.1109/ICCSP.2011.5739380","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739380","url":null,"abstract":"This paper for the first time presents a novel voltage mode (VM) resistor less first order all pass filter employing multiple-output current controlled current conveyor transconductance amplifier (MO-CCCCTA).The proposed circuit employs only one active element and one truly (not virtually) grounded capacitor. The angular pole frequency of the filter can be electronically tuned with the help of bias current. The proposed circuit is very appropriate to further develop into an integrated circuit. Sensitivity study of the circuit is provided and SPICE simulations have been included to verify the workability of the proposed circuit.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129562907","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739284
V. S. Babu, M. R. Shankar, Sourav Majumdar, S. K. Rao
In underwater scenario, algorithms that assume constant velocity model are suitable for tracking non maneuvering targets but fail if target is maneuvering. The Interacting Multiple Model algorithm is a widely accepted state estimation scheme for solving maneuvering target tracking problems. This paper presents the IMM method of tracking under water maneuvering targets using active sonar measurements. UKF is used throughout the process and the simulation results for two scenarios are presented.
{"title":"IMM - Unscented Kalman Filter based tracking of maneuvering targets using active sonar measurements","authors":"V. S. Babu, M. R. Shankar, Sourav Majumdar, S. K. Rao","doi":"10.1109/ICCSP.2011.5739284","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739284","url":null,"abstract":"In underwater scenario, algorithms that assume constant velocity model are suitable for tracking non maneuvering targets but fail if target is maneuvering. The Interacting Multiple Model algorithm is a widely accepted state estimation scheme for solving maneuvering target tracking problems. This paper presents the IMM method of tracking under water maneuvering targets using active sonar measurements. UKF is used throughout the process and the simulation results for two scenarios are presented.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133027326","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739407
M. S. Nishamol, V. Sarin, D. Tony, C. Aanandan, P. Mohanan, K. Vasudevan
A novel compact dual frequency reconfigurable microstrip antenna achieving polarization tuning by loading a single chip capacitor is presented. A cross shaped patch antenna with an X-slot constitutes the fundamental structure of the antenna. The tuning of the two resonant frequencies is realized by varying the effective electrical length of the slot with an embedded capacitor at the centre of the X-slot. A high tuning range of 34.48% (672– 952MHz) and 14.3% (1.5145–1.748GHz) is achieved for the first and third resonant frequencies respectively while minimizing variations of the second resonant frequency. Measured and simulated results of the antenna indicate that the frequency ratio can assume any value in the range 1.025 ≤ fR ≤ 1.21 with linear or circularly polarized radiation by changing the capacitor value from 1pF to 100pF. Furthermore, the proposed antenna offers moderate gain with low cross-polarized radiation and the radiation patterns of each frequency remain unchanged as the capacitor value is changed.
{"title":"Frequency and polarization tuning of a cross patch antenna using capacitive loading","authors":"M. S. Nishamol, V. Sarin, D. Tony, C. Aanandan, P. Mohanan, K. Vasudevan","doi":"10.1109/ICCSP.2011.5739407","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739407","url":null,"abstract":"A novel compact dual frequency reconfigurable microstrip antenna achieving polarization tuning by loading a single chip capacitor is presented. A cross shaped patch antenna with an X-slot constitutes the fundamental structure of the antenna. The tuning of the two resonant frequencies is realized by varying the effective electrical length of the slot with an embedded capacitor at the centre of the X-slot. A high tuning range of 34.48% (672– 952MHz) and 14.3% (1.5145–1.748GHz) is achieved for the first and third resonant frequencies respectively while minimizing variations of the second resonant frequency. Measured and simulated results of the antenna indicate that the frequency ratio can assume any value in the range 1.025 ≤ fR ≤ 1.21 with linear or circularly polarized radiation by changing the capacitor value from 1pF to 100pF. Furthermore, the proposed antenna offers moderate gain with low cross-polarized radiation and the radiation patterns of each frequency remain unchanged as the capacitor value is changed.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134195409","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739292
V.P. Hima Vijayan, Ebin M. Manuel
The paper proposes two puncturing schemes, namely PDI and IntP for coded OFDMA. In the proposed structure, the data is encoded with the lowest available code rate and it is divided among different resource blocks(tiles), where it is punctured adaptively based on some measure of channel quality for each tile. The effect of adaptive puncturing is analysed in multi-cell scenario also. The results are compared with that of normal coded OFDMA system. Simulation results show that puncturing schemes provide significant performance improvement for coded OFDMA systems.
{"title":"Analysis of adaptive puncturing schemes for OFDMA system in multi-cell scenario","authors":"V.P. Hima Vijayan, Ebin M. Manuel","doi":"10.1109/ICCSP.2011.5739292","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739292","url":null,"abstract":"The paper proposes two puncturing schemes, namely PDI and IntP for coded OFDMA. In the proposed structure, the data is encoded with the lowest available code rate and it is divided among different resource blocks(tiles), where it is punctured adaptively based on some measure of channel quality for each tile. The effect of adaptive puncturing is analysed in multi-cell scenario also. The results are compared with that of normal coded OFDMA system. Simulation results show that puncturing schemes provide significant performance improvement for coded OFDMA systems.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129785888","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739394
P. Majumdar, A. K. Verma
The paper addresses a CAD oriented closed-form expression for dispersive and conductor thickness based line parameters for symmetrical coplanar strip lines(CPS) on a finite-thickness dielectric substrate. Then, based on the analysis of CPS's, elliptical coplanar strip line (ECPS's) is studied. CAD oriented closed-form expression for the losses based on stopping distance for ECPS's is obtained. The expressions are simple and accurate for microwave circuit designs and are applicable to both thin and thick conductors. Comparisons with published data from full-wave methods, experiments, HFSS and SONNET are presented to validate the expressions derived for all the cases. The average deviation of the model against the experimental result is 2.06 %.
{"title":"Analytical model of losses for symmetric elliptical coplanar strip lines","authors":"P. Majumdar, A. K. Verma","doi":"10.1109/ICCSP.2011.5739394","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739394","url":null,"abstract":"The paper addresses a CAD oriented closed-form expression for dispersive and conductor thickness based line parameters for symmetrical coplanar strip lines(CPS) on a finite-thickness dielectric substrate. Then, based on the analysis of CPS's, elliptical coplanar strip line (ECPS's) is studied. CAD oriented closed-form expression for the losses based on stopping distance for ECPS's is obtained. The expressions are simple and accurate for microwave circuit designs and are applicable to both thin and thick conductors. Comparisons with published data from full-wave methods, experiments, HFSS and SONNET are presented to validate the expressions derived for all the cases. The average deviation of the model against the experimental result is 2.06 %.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132902104","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739339
A. Davis, Kashyap Vasudevan, J. Kuri, Haresh Dagale
As migration to IPv6 occurs slowly, IPv4 and IPv6 hosts will coexist for many years. We consider a specific scenario where the legacy IPv4 systems can not be upgraded and also the new systems are IPv6. The mix of IPv4 and IPv6 machines exist in the same network and both need to interoperate. We propose a novel Translator called SBIIT (Socket identifier Based IPv4/IPv6 Translator), which is based on a modification of NAT-PT. SBIIT provides support for SIP, SAP and multicast translation. To do this, translation has to be performed in packet headers as well as in payloads, because these protocols embed IP addresses in payloads. Moreover, this is achieved without any modifications to v4/v6 end hosts. We design and implement SBIIT in hardware using the network processor IXP 435 from Intel. Extensive tests demonstrate that the Translator is able to provide seamless interoperability between v4 and v6 hosts running applications based on SIP, Multicast, TCP, UDP as well as ICMP.
{"title":"IPv4-IPv6 translator for VoIP and video conferencing","authors":"A. Davis, Kashyap Vasudevan, J. Kuri, Haresh Dagale","doi":"10.1109/ICCSP.2011.5739339","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739339","url":null,"abstract":"As migration to IPv6 occurs slowly, IPv4 and IPv6 hosts will coexist for many years. We consider a specific scenario where the legacy IPv4 systems can not be upgraded and also the new systems are IPv6. The mix of IPv4 and IPv6 machines exist in the same network and both need to interoperate. We propose a novel Translator called SBIIT (Socket identifier Based IPv4/IPv6 Translator), which is based on a modification of NAT-PT. SBIIT provides support for SIP, SAP and multicast translation. To do this, translation has to be performed in packet headers as well as in payloads, because these protocols embed IP addresses in payloads. Moreover, this is achieved without any modifications to v4/v6 end hosts. We design and implement SBIIT in hardware using the network processor IXP 435 from Intel. Extensive tests demonstrate that the Translator is able to provide seamless interoperability between v4 and v6 hosts running applications based on SIP, Multicast, TCP, UDP as well as ICMP.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114057449","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 : 2011-03-24DOI: 10.1109/ICCSP.2011.5739337
S. Suchitra, R. Satzoda, T. Srikanthan
Detecting curvilinear edges, that includes curved or linear or both, is a crucial image processing operation in applications like lane detection, shape/object detection, industrial shape detection, iris detection etc. In this paper, we propose a novel technique to generate edge maps containing specific kinds of edges. Given an edge map, the proposed technique uses gradient angle histograms (GAHs) to: (1) selectively extract either linear or curved edges from a given edge map and, (2) extract curved edges of varying curvatures. The GAH signature of various features are studied, and the relationship between the curvature of the curves of interest and the different parameters in a GAH, are described. Experiments on real images show that given a set of initialization conditions, the proposed technique can be used effectively extract edges of different curvatures.
{"title":"Selective extraction of curvilinear edges using gradient angle histograms","authors":"S. Suchitra, R. Satzoda, T. Srikanthan","doi":"10.1109/ICCSP.2011.5739337","DOIUrl":"https://doi.org/10.1109/ICCSP.2011.5739337","url":null,"abstract":"Detecting curvilinear edges, that includes curved or linear or both, is a crucial image processing operation in applications like lane detection, shape/object detection, industrial shape detection, iris detection etc. In this paper, we propose a novel technique to generate edge maps containing specific kinds of edges. Given an edge map, the proposed technique uses gradient angle histograms (GAHs) to: (1) selectively extract either linear or curved edges from a given edge map and, (2) extract curved edges of varying curvatures. The GAH signature of various features are studied, and the relationship between the curvature of the curves of interest and the different parameters in a GAH, are described. Experiments on real images show that given a set of initialization conditions, the proposed technique can be used effectively extract edges of different curvatures.","PeriodicalId":408736,"journal":{"name":"2011 International Conference on Communications and Signal Processing","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115176852","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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