Pub Date : 2012-04-03DOI: 10.1109/IBCAST.2012.6177558
T. A. Khan, Xue-ying Deng
Desire for super maneuverability and agility for modern air vehicles has resulted in high angles of attack flights. Different dynamic instability phenomenon may arise at high angles of attack. Wing rock, which is self excited limit cycle oscillations in roll mainly, is amongst one of these. Experiments have been carried out at sub-critical Reynolds number to investigate un-commanded free-to-roll (FTR) motions induced by forebody complex flow on a 30° swept back non-slender wings-slender body-model. Experimental investigations of FTR motions are firstly conducted for static angles of attack (0° to 90°) to understand the basic flow and aerodynamics mechanisms followed by the effects of large amplitude pitch-up motions at variable rates on these un-commanded roll motions. It has been observed that asymmetric forebody vortices (AFV) dominate and control the roll motion of the model for angles of attack >; 26°. For the dynamic (pitch-up) case it has been observed that roll amplitude decreases and lag increases with increase in pitch-up rate. Increase in windward and leeward surface pressures with increase in pitch-up rate is observed. This increase in surface pressures is asymmetric on the wings leeward side in AFV region, angle of attack >; 26°. Decrease in roll amplitude, increase in damping or restoring moment provided by the lower surface and increase in normal force and side force coefficients are attributed to these changes in the surface pressures due to the pitch-up effect. Roll behavior for non-dimensional pitch-up rate ≥ 1×10-2 is characterized by sinusoidal type curve, absence of roll divergence and no significant roll contribution from the wings flow.
{"title":"Effect of large amplitude pitch-up motions on un-commanded roll behavior of low swept wings-slender body model","authors":"T. A. Khan, Xue-ying Deng","doi":"10.1109/IBCAST.2012.6177558","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177558","url":null,"abstract":"Desire for super maneuverability and agility for modern air vehicles has resulted in high angles of attack flights. Different dynamic instability phenomenon may arise at high angles of attack. Wing rock, which is self excited limit cycle oscillations in roll mainly, is amongst one of these. Experiments have been carried out at sub-critical Reynolds number to investigate un-commanded free-to-roll (FTR) motions induced by forebody complex flow on a 30° swept back non-slender wings-slender body-model. Experimental investigations of FTR motions are firstly conducted for static angles of attack (0° to 90°) to understand the basic flow and aerodynamics mechanisms followed by the effects of large amplitude pitch-up motions at variable rates on these un-commanded roll motions. It has been observed that asymmetric forebody vortices (AFV) dominate and control the roll motion of the model for angles of attack >; 26°. For the dynamic (pitch-up) case it has been observed that roll amplitude decreases and lag increases with increase in pitch-up rate. Increase in windward and leeward surface pressures with increase in pitch-up rate is observed. This increase in surface pressures is asymmetric on the wings leeward side in AFV region, angle of attack >; 26°. Decrease in roll amplitude, increase in damping or restoring moment provided by the lower surface and increase in normal force and side force coefficients are attributed to these changes in the surface pressures due to the pitch-up effect. Roll behavior for non-dimensional pitch-up rate ≥ 1×10-2 is characterized by sinusoidal type curve, absence of roll divergence and no significant roll contribution from the wings flow.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","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":"122179717","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/IBCAST.2012.6177525
A. Baig, R. Nawaz
Facial recognition is considered by many to be one of the key areas in the field of biometrics. It has a few very significant advantages over other modalities including universal acceptability and covert acqusition. On the flip side, it provides some very unique challenges in terms of pose and expression variation etc. These challenges make it difficult to develop a real time facial recognition system that provides a very high accuracy rate. Nontheless a few attempts have been made by researchers to provide a robust real time facial recognition system. Probably, the best and most recent attempt is to represent the whole system via sparse representation. In this paper we extend this work by utilizing the cascaded classifier based approach. The results show that the proposed approach provides improved accuracy while still performing in real time.
{"title":"Cascaded face recognition system via sparse representation","authors":"A. Baig, R. Nawaz","doi":"10.1109/IBCAST.2012.6177525","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177525","url":null,"abstract":"Facial recognition is considered by many to be one of the key areas in the field of biometrics. It has a few very significant advantages over other modalities including universal acceptability and covert acqusition. On the flip side, it provides some very unique challenges in terms of pose and expression variation etc. These challenges make it difficult to develop a real time facial recognition system that provides a very high accuracy rate. Nontheless a few attempts have been made by researchers to provide a robust real time facial recognition system. Probably, the best and most recent attempt is to represent the whole system via sparse representation. In this paper we extend this work by utilizing the cascaded classifier based approach. The results show that the proposed approach provides improved accuracy while still performing in real time.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","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":"128925719","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/IBCAST.2012.6177577
S. Qadir, Yangyu Fan, Wang Bao-ping, M. Shabbir, F. Arneeb
This article mulls over the implementation of Matrix Pencil back Projection (MPBP) algorithm on Inverse Synthetic Aperture Radar (ISAR) data of uniformly rotating targets. The method is recently proposed by Sahin Ozsoy et al. for Synthetic Aperture Radar (SAR). In this paper, the method is implemented with FIR pre-filtering instead of using approximate prolate spheroidal wave functions given in the original method. Moreover, the article emphasizes on the comparison between the standard Convolution Back projection Method (CBP) and MPBP methods in terms of; 1) reconstructed image quality when a small set of data is used; 2) noise performance for additive zero-mean white Gaussian noise. MPBP and CBP are applied both on the simulated and the experimental ISAR data. The ku-band experimental ISAR data is acquired for the targets (spheres and corner reflectors) arranged in different geometries in a Far-Field Compact Range Anechoic chamber at AERO, Pakistan.
{"title":"ISAR imaging of rotating targets using Matrix Pencil back-Projection method","authors":"S. Qadir, Yangyu Fan, Wang Bao-ping, M. Shabbir, F. Arneeb","doi":"10.1109/IBCAST.2012.6177577","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177577","url":null,"abstract":"This article mulls over the implementation of Matrix Pencil back Projection (MPBP) algorithm on Inverse Synthetic Aperture Radar (ISAR) data of uniformly rotating targets. The method is recently proposed by Sahin Ozsoy et al. for Synthetic Aperture Radar (SAR). In this paper, the method is implemented with FIR pre-filtering instead of using approximate prolate spheroidal wave functions given in the original method. Moreover, the article emphasizes on the comparison between the standard Convolution Back projection Method (CBP) and MPBP methods in terms of; 1) reconstructed image quality when a small set of data is used; 2) noise performance for additive zero-mean white Gaussian noise. MPBP and CBP are applied both on the simulated and the experimental ISAR data. The ku-band experimental ISAR data is acquired for the targets (spheres and corner reflectors) arranged in different geometries in a Far-Field Compact Range Anechoic chamber at AERO, Pakistan.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"20 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":"132048087","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/IBCAST.2012.6177566
M. Usman, S. Malik, M. Rafique
The present work is about the investigation of non-premixed combustion when primary air is introduced with swirl. CFD modeling of combustion of methane is accomplished using a Navier-Stoke solver. For turbulence modeling, k-epsilon realizable model is used. Axial and tangential velocities of air and combustion products are calculated at different axial locations to compare with experimental results. The comparison showed a good agreement with experimental data. [1]. Moreover variation of flame length is also studied at different geometrical swirl numbers for primary air introduced. Swirl number is varied by varying tangential velocity of primary air introduced through the annulus region. It was observed that flame length is reduced gradually by increasing the swirl number and improves stability of flame.
{"title":"Probability density function computations of a strongly swirling flame","authors":"M. Usman, S. Malik, M. Rafique","doi":"10.1109/IBCAST.2012.6177566","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177566","url":null,"abstract":"The present work is about the investigation of non-premixed combustion when primary air is introduced with swirl. CFD modeling of combustion of methane is accomplished using a Navier-Stoke solver. For turbulence modeling, k-epsilon realizable model is used. Axial and tangential velocities of air and combustion products are calculated at different axial locations to compare with experimental results. The comparison showed a good agreement with experimental data. [1]. Moreover variation of flame length is also studied at different geometrical swirl numbers for primary air introduced. Swirl number is varied by varying tangential velocity of primary air introduced through the annulus region. It was observed that flame length is reduced gradually by increasing the swirl number and improves stability of flame.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"79 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":"132126010","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/IBCAST.2012.6177556
A. Malik, M. Alvi, S. Khushnood, F. Mahfouz, M. Ghauri, A. Shah
The conjugate heat transfer within a bottom-heated non-conventional cylindrical enclosure is important with respect to the processes in chemical and nuclear industries. In this research work numerical analysis of the enclosure with respect to the centrifuge machines used in the process industry is presented. Various CFD simulations of the experimental work of [1] are performed to study the effects of materials of the disc and inner cylinder and geometries of outer cylinder on the enclosure. Generally, a uniform temperature is required in such enclosures. A more uniform temperature is observed in the enclosure by using aluminum inner cylinder at a temperature of 433K of the bottom disc and using two different diameter outer cylinders as compared to the mild steel and stainless steel.
{"title":"Numerical study of conjugate heat transfer within a bottom heated cylindrical enclosure","authors":"A. Malik, M. Alvi, S. Khushnood, F. Mahfouz, M. Ghauri, A. Shah","doi":"10.1109/IBCAST.2012.6177556","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177556","url":null,"abstract":"The conjugate heat transfer within a bottom-heated non-conventional cylindrical enclosure is important with respect to the processes in chemical and nuclear industries. In this research work numerical analysis of the enclosure with respect to the centrifuge machines used in the process industry is presented. Various CFD simulations of the experimental work of [1] are performed to study the effects of materials of the disc and inner cylinder and geometries of outer cylinder on the enclosure. Generally, a uniform temperature is required in such enclosures. A more uniform temperature is observed in the enclosure by using aluminum inner cylinder at a temperature of 433K of the bottom disc and using two different diameter outer cylinders as compared to the mild steel and stainless steel.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"30 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":"130784379","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/IBCAST.2012.6177582
J. Zaidi, U. Naeem, M. A. Shah
A dual mode dielectric resonator filter is designed, simulated and fabricated for a satellite telecommand receiver where high performance (low loss, high Q and narrow bandwidth filters) is required. Besides this, compact size and light weight is also a requirement. By using dual mode resonators the number of physical cavities is reduced by half and hence the size and mass is reduced. Full wave EM simulations and measurements of the designed filter are performed. Simulated and measured results of the proposed filter show good correlation.
{"title":"High performance compact microwave filters for space applications","authors":"J. Zaidi, U. Naeem, M. A. Shah","doi":"10.1109/IBCAST.2012.6177582","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177582","url":null,"abstract":"A dual mode dielectric resonator filter is designed, simulated and fabricated for a satellite telecommand receiver where high performance (low loss, high Q and narrow bandwidth filters) is required. Besides this, compact size and light weight is also a requirement. By using dual mode resonators the number of physical cavities is reduced by half and hence the size and mass is reduced. Full wave EM simulations and measurements of the designed filter are performed. Simulated and measured results of the proposed filter show good correlation.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"63 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":"121100978","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/IBCAST.2012.6177576
A. S. Shafaat Ali, M. Raza, M. A. Shah
Air Borne & Space Borne SAR Payloads are used now a days in variety of missions for different applications. Onboard SAR payload consists of a digital signal processing & data storage unit, a transceiver and an antenna unit. Onboard antenna is a vital unit of a communication system and design of antenna becomes much more critical and complex once electronic beam steering is an essential requirement. Usually for SAR applications, electronically steerable high gain antennas are required to support different operating modes. In this paper, design of 32 elements X-band Phased Array is discussed along with its simulation and measurement results. Design antenna is based on microstrip technology and orientation of feeding mechanism to a certain group of elements is such that it provides circular polarization both across range/azimuth. Electronically steering is possible by changing the phase at the inputs of the antenna ports and different possible steering scenarios are discussed in this paper. An advanced EM simulation software is being used for design and simulation purpose. Simulated results provide a gain of approximately 20 dB with a VSWR <; 2 at desired frequency range in the band. Axial ratio of <; 3 is targeted and achieved in the desired frequency range.
{"title":"Design & development of a 32 elements X-band Phased Array antenna for airborne & Space borne SAR payloads","authors":"A. S. Shafaat Ali, M. Raza, M. A. Shah","doi":"10.1109/IBCAST.2012.6177576","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177576","url":null,"abstract":"Air Borne & Space Borne SAR Payloads are used now a days in variety of missions for different applications. Onboard SAR payload consists of a digital signal processing & data storage unit, a transceiver and an antenna unit. Onboard antenna is a vital unit of a communication system and design of antenna becomes much more critical and complex once electronic beam steering is an essential requirement. Usually for SAR applications, electronically steerable high gain antennas are required to support different operating modes. In this paper, design of 32 elements X-band Phased Array is discussed along with its simulation and measurement results. Design antenna is based on microstrip technology and orientation of feeding mechanism to a certain group of elements is such that it provides circular polarization both across range/azimuth. Electronically steering is possible by changing the phase at the inputs of the antenna ports and different possible steering scenarios are discussed in this paper. An advanced EM simulation software is being used for design and simulation purpose. Simulated results provide a gain of approximately 20 dB with a VSWR <; 2 at desired frequency range in the band. Axial ratio of <; 3 is targeted and achieved in the desired frequency range.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"30 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":"125562268","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/IBCAST.2012.6177573
A. Mueed, Jiadong Xu, Y. Shangbin
Use of planar antenna for conformal applications is of great engineering utilization; however antenna embedding into conformal shapes needs careful analysis. The cavity-backed proximity coupled microstrip patch antenna for spherical conformal application is analyzed. Dielectric and metallic material is used for the sphere. Coax fed antenna is used for embedding for conformal application. A dielectric cover is placed on top of the surface of the antenna to shield the patch and make the spherical surface continuous. Two types of spherical cuts are used with radii of 2λ and 5λ and thickness of 0.508 mm and 7 mm. Simulation results including vswr, radiation pattern and gain are provided. The parametric study including the effect of material, thickness, radius and dielectric cover is also discussed for the design. The results indicate that the bandwidth of coax fed antenna exceeds 30% at X- band and the impedance of the antenna is not sensitive to the spherical radius, however the radiation pattern is affected for different thickness and extent of cut of sphere. The radiation pattern is more stable in case of dielectric sphere with reduced thickness as compared to the metallic sphere with increased thickness, irrespective of extent of sphere cut. The dielectric sphere with increased thickness and metallic sphere with reduced thickness deteriorate the radiation pattern by introducing higher back and side lobes. The effect of dielectric cover is to shift the frequency band towards lower frequencies. Higher gain is observed for metallic spheres. Such an embedded antenna has the potential to be easily used for platform mounted applications like UAV, Missile or satellites.
{"title":"Spherical embedded antenna for conformal applications","authors":"A. Mueed, Jiadong Xu, Y. Shangbin","doi":"10.1109/IBCAST.2012.6177573","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177573","url":null,"abstract":"Use of planar antenna for conformal applications is of great engineering utilization; however antenna embedding into conformal shapes needs careful analysis. The cavity-backed proximity coupled microstrip patch antenna for spherical conformal application is analyzed. Dielectric and metallic material is used for the sphere. Coax fed antenna is used for embedding for conformal application. A dielectric cover is placed on top of the surface of the antenna to shield the patch and make the spherical surface continuous. Two types of spherical cuts are used with radii of 2λ and 5λ and thickness of 0.508 mm and 7 mm. Simulation results including vswr, radiation pattern and gain are provided. The parametric study including the effect of material, thickness, radius and dielectric cover is also discussed for the design. The results indicate that the bandwidth of coax fed antenna exceeds 30% at X- band and the impedance of the antenna is not sensitive to the spherical radius, however the radiation pattern is affected for different thickness and extent of cut of sphere. The radiation pattern is more stable in case of dielectric sphere with reduced thickness as compared to the metallic sphere with increased thickness, irrespective of extent of sphere cut. The dielectric sphere with increased thickness and metallic sphere with reduced thickness deteriorate the radiation pattern by introducing higher back and side lobes. The effect of dielectric cover is to shift the frequency band towards lower frequencies. Higher gain is observed for metallic spheres. Such an embedded antenna has the potential to be easily used for platform mounted applications like UAV, Missile or satellites.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","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":"128849319","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/IBCAST.2012.6177594
A. Ali, A. Hasan
In the absence of multi-user detection techniques in ad hoc networks, interference management is done through MAC scheduling by creating suitable exclusion zones around active receivers. Applying MAC mechanisms alters the spatial distribution Φi of parent contending nodes to thinned daughter distribution Φs. The knowledge of post-MAC geometrical distribution of nodes is important for efficient MAC implementation. The paper provides a thinning model to capture the MAC implementation in ad hoc networks and investigates the stochastic geometry of thinned nodes. It is shown that the thinning process results in different spatial distributions that is sensitive to the robustness of the physical layer.
{"title":"Stochastic geometry of thinned nodes in ad hoc networks","authors":"A. Ali, A. Hasan","doi":"10.1109/IBCAST.2012.6177594","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177594","url":null,"abstract":"In the absence of multi-user detection techniques in ad hoc networks, interference management is done through MAC scheduling by creating suitable exclusion zones around active receivers. Applying MAC mechanisms alters the spatial distribution Φi of parent contending nodes to thinned daughter distribution Φs. The knowledge of post-MAC geometrical distribution of nodes is important for efficient MAC implementation. The paper provides a thinning model to capture the MAC implementation in ad hoc networks and investigates the stochastic geometry of thinned nodes. It is shown that the thinning process results in different spatial distributions that is sensitive to the robustness of the physical layer.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"23 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":"114914450","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 : 1900-01-01DOI: 10.1109/IBCAST.2012.6177536
S. M. Shah, R. Samar
In this paper, the idea of Bit-Interleaved Coded Modulation has been applied to cooperative transmission among three UAVs which exchange important mission data for cooperative control. Both decode and Forward as well as Amplify and forward transmissions are considered and the results are also compared with direct transmission when the UAVs share information without sharing. The positional configurations include V-shaped flight, line and random. The channel model has been extended to general case, where the communicating terminals can have multiple antennas and there are multiple relays. Assuming perfect channel state information, it has been observed that amplify and forward outperform direct and decode and forward transmission in most scenarios.
{"title":"Cooperative communication in 3-UAVs: Performance analysis with BICM transmission","authors":"S. M. Shah, R. Samar","doi":"10.1109/IBCAST.2012.6177536","DOIUrl":"https://doi.org/10.1109/IBCAST.2012.6177536","url":null,"abstract":"In this paper, the idea of Bit-Interleaved Coded Modulation has been applied to cooperative transmission among three UAVs which exchange important mission data for cooperative control. Both decode and Forward as well as Amplify and forward transmissions are considered and the results are also compared with direct transmission when the UAVs share information without sharing. The positional configurations include V-shaped flight, line and random. The channel model has been extended to general case, where the communicating terminals can have multiple antennas and there are multiple relays. Assuming perfect channel state information, it has been observed that amplify and forward outperform direct and decode and forward transmission in most scenarios.","PeriodicalId":251584,"journal":{"name":"Proceedings of 2012 9th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115848534","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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