Pub Date : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705756
Ahmed Wagdy, T. Khattab, E. Sourour
Limited feedback closed-loop spatial multiplexing evolved as an attractive technique during the development of Multi Input Multi Output (MIMO) in Long Term Evolution (LTE). Spatial multiplexing involves transmitting independent streams of data across multiple antennas to maximize throughput. Closed-loop spatial multiplexing adapt the system to the current channel state throughout a limited feedback channel. In This scheme precoding matrix selection is performed by the user equipment (UE) while applying the selected matrix by the transmitter. In this paper, we propose a new algorithm for precoding matrix selection, based on QR decomposition and minimum mean square error (MMSE), which has an attractive performance and computational complexity gain, so it can be used to efficiently select precoding matrix at UE side. A review over the existent selection techniques is introduced. Also we provide a comparison between the performance of the proposed techniques and the ones in the review in terms of bit error rate (BER) and computational complexity.
{"title":"Modified QR-D and MMSE PMI selection technique for MIMO closed loop spatial multiplexing in LTE/LTE-advanced","authors":"Ahmed Wagdy, T. Khattab, E. Sourour","doi":"10.1109/IEEEGCC.2013.6705756","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705756","url":null,"abstract":"Limited feedback closed-loop spatial multiplexing evolved as an attractive technique during the development of Multi Input Multi Output (MIMO) in Long Term Evolution (LTE). Spatial multiplexing involves transmitting independent streams of data across multiple antennas to maximize throughput. Closed-loop spatial multiplexing adapt the system to the current channel state throughout a limited feedback channel. In This scheme precoding matrix selection is performed by the user equipment (UE) while applying the selected matrix by the transmitter. In this paper, we propose a new algorithm for precoding matrix selection, based on QR decomposition and minimum mean square error (MMSE), which has an attractive performance and computational complexity gain, so it can be used to efficiently select precoding matrix at UE side. A review over the existent selection techniques is introduced. Also we provide a comparison between the performance of the proposed techniques and the ones in the review in terms of bit error rate (BER) and computational complexity.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127575356","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705802
A. AlSaammare, M. Shaqfeh, H. Alnuweiri
In recent days, relay assisted cellular networks are gaining more importance in research and development because of the recent adoption of new communication standards with relaying and cooperation communication. This has introduced a multichannel diversity along with the multiuser diversity and the channel aware dynamic resource allocation models. The issue of the optimal location of relays has risen especially when dedicated relays are used as the standard proposes instead of the cooperative model of the users. In this paper, we study the optimal location of a single relay. Furthermore, we study the effect of changing the number of users on the optimal location of the relay. The effect of adding multiple relays to the system is examined. The optimal locations are examined when the relay channels are the only channels to be used by the system and when the direct channel (DT) is also available. The problem formulation assumes, Rayleigh block faded channels, half duplex regenerative (repetition coding) decode-and-forward (DF) relaying strategy, long-term average total transmitted power constraint and orthogonal multiplexing of the users messages within the channel blocks. New simple and accurate approximations to the modified Bessel functions of the first kind, zeroth order I0 (z) and first order I1 (z) are presented. The new proposed approximations are given as a simple finite sum of scaled exponential functions. Comparisons are made between the exact functions, classic approximations, and the new approximation in terms of simplicity and accuracy. The new approximation proves to be sufficiently accurate to bridge the gap between the classic large and small argument approximations and has potential applications in allowing one to analytically evaluate integrals containing Modified Bessel Functions, yielding simple closed-form solutions. A generalized closed-form expression for the average bit error rate over Nakagami-n (Rice) fading, and Rayleigh fading as a special case, are derived as sample applications, and the results are compared with Monte Carlo Simulation, where a very good matching is achieved.
{"title":"A simple and efficient approximation to the modified Bessel functions and its applications to Rician fading","authors":"A. AlSaammare, M. Shaqfeh, H. Alnuweiri","doi":"10.1109/IEEEGCC.2013.6705802","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705802","url":null,"abstract":"In recent days, relay assisted cellular networks are gaining more importance in research and development because of the recent adoption of new communication standards with relaying and cooperation communication. This has introduced a multichannel diversity along with the multiuser diversity and the channel aware dynamic resource allocation models. The issue of the optimal location of relays has risen especially when dedicated relays are used as the standard proposes instead of the cooperative model of the users. In this paper, we study the optimal location of a single relay. Furthermore, we study the effect of changing the number of users on the optimal location of the relay. The effect of adding multiple relays to the system is examined. The optimal locations are examined when the relay channels are the only channels to be used by the system and when the direct channel (DT) is also available. The problem formulation assumes, Rayleigh block faded channels, half duplex regenerative (repetition coding) decode-and-forward (DF) relaying strategy, long-term average total transmitted power constraint and orthogonal multiplexing of the users messages within the channel blocks. New simple and accurate approximations to the modified Bessel functions of the first kind, zeroth order I0 (z) and first order I1 (z) are presented. The new proposed approximations are given as a simple finite sum of scaled exponential functions. Comparisons are made between the exact functions, classic approximations, and the new approximation in terms of simplicity and accuracy. The new approximation proves to be sufficiently accurate to bridge the gap between the classic large and small argument approximations and has potential applications in allowing one to analytically evaluate integrals containing Modified Bessel Functions, yielding simple closed-form solutions. A generalized closed-form expression for the average bit error rate over Nakagami-n (Rice) fading, and Rayleigh fading as a special case, are derived as sample applications, and the results are compared with Monte Carlo Simulation, where a very good matching is achieved.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124300232","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705833
Sarah Asheer, Amna Al-Marawani, T. Khattab, A. Massoud
This paper explores the employment of inductive power transfer and data transfer (IPDT) for charging of electric vehicles (EV). The main objective of this paper spans the analysis and development of the inductive power transfer (IPT) design, and the practical implementation of the system prototype. The IPT typically consists of two parts; the transmitter and the receiver part. The recitified DC at the transimitter is converted to AC of high frequency through a DC-AC converter with resonat circuits at both ends (receiever and transmitter). The power transferred to the secondary is used for electric vehicle battery charging through a rectified. Data also is transferred wirelessly in order to control the electric vehicles charging process throughout different proposed scenarios. A prototype has been tested experimentally for the IPDT.
{"title":"Inductive power transfer with wireless communication system for electric vehicles","authors":"Sarah Asheer, Amna Al-Marawani, T. Khattab, A. Massoud","doi":"10.1109/IEEEGCC.2013.6705833","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705833","url":null,"abstract":"This paper explores the employment of inductive power transfer and data transfer (IPDT) for charging of electric vehicles (EV). The main objective of this paper spans the analysis and development of the inductive power transfer (IPT) design, and the practical implementation of the system prototype. The IPT typically consists of two parts; the transmitter and the receiver part. The recitified DC at the transimitter is converted to AC of high frequency through a DC-AC converter with resonat circuits at both ends (receiever and transmitter). The power transferred to the secondary is used for electric vehicle battery charging through a rectified. Data also is transferred wirelessly in order to control the electric vehicles charging process throughout different proposed scenarios. A prototype has been tested experimentally for the IPDT.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"172 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131486059","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705742
Bassant Selim, Y. Iraqi, Ho‐Jin Choi
Pervasive healthcare systems, enabled by information and communication technology (ICT), can allow the elderly and chronically ill to stay at home while being constantly monitored. Patient monitoring can be achieved by sensors and sensor systems that are both worn by the patient and installed in his home environment. There is a large variety of sensors available on the market that can all serve to this purpose. In order to have a system that is independent of the sensors that are used, standardization is the key requirement. This work aims to present a framework for healthcare monitoring systems based on heterogeneous sensors. In order to achieve interoperability, standards are considered in the system design.
{"title":"An interoperable multi-sensor system for healthcare","authors":"Bassant Selim, Y. Iraqi, Ho‐Jin Choi","doi":"10.1109/IEEEGCC.2013.6705742","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705742","url":null,"abstract":"Pervasive healthcare systems, enabled by information and communication technology (ICT), can allow the elderly and chronically ill to stay at home while being constantly monitored. Patient monitoring can be achieved by sensors and sensor systems that are both worn by the patient and installed in his home environment. There is a large variety of sensors available on the market that can all serve to this purpose. In order to have a system that is independent of the sensors that are used, standardization is the key requirement. This work aims to present a framework for healthcare monitoring systems based on heterogeneous sensors. In order to achieve interoperability, standards are considered in the system design.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134166646","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705762
A. Alti, Sébastien Laborie, P. Roose
Multimedia technologies and advanced internet networks are vital to the economic development of both developed and developing countries. In the mobile multimedia domain, excellence is synonymous to the quality management of multimedia documents. Currently, these documents are accessible on a wide variety of devices, such as laptops, tablets and smartphones. The (hardware and software) heterogeneity of such devices and the diversity of user preferences require adaptation of multimedia documents. Current adaptation frameworks do not fully exploit the semantic benefits for describing the adaptation components and the quality of services. However, we have noticed that current adaptation frameworks do not handle any issue related to adaptation quality customization and optimization. This paper overcomes this limitation by proposing a generic framework for selecting a relevant set of adaptation services according to user preferences and allowing the automatic generation of a dynamic and a quality composition of heterogeneous adaptation components. Our proposal has the great advantage to offer to users a global flexible adaptation infrastructure for adaptation of multimedia document and customization of quality of service properties.
{"title":"A framework for managing and optimizing the adaptation process qualities","authors":"A. Alti, Sébastien Laborie, P. Roose","doi":"10.1109/IEEEGCC.2013.6705762","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705762","url":null,"abstract":"Multimedia technologies and advanced internet networks are vital to the economic development of both developed and developing countries. In the mobile multimedia domain, excellence is synonymous to the quality management of multimedia documents. Currently, these documents are accessible on a wide variety of devices, such as laptops, tablets and smartphones. The (hardware and software) heterogeneity of such devices and the diversity of user preferences require adaptation of multimedia documents. Current adaptation frameworks do not fully exploit the semantic benefits for describing the adaptation components and the quality of services. However, we have noticed that current adaptation frameworks do not handle any issue related to adaptation quality customization and optimization. This paper overcomes this limitation by proposing a generic framework for selecting a relevant set of adaptation services according to user preferences and allowing the automatic generation of a dynamic and a quality composition of heterogeneous adaptation components. Our proposal has the great advantage to offer to users a global flexible adaptation infrastructure for adaptation of multimedia document and customization of quality of service properties.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133806947","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705831
M. B. Hani, H. Salameh, Y. Jararweh, A. Bousselham
Co-existence of different wireless networks and interference management are challenging problems in a Cognitive Radio (CR) environment. There are two different types of co-existence; incumbent co-existence (between licensed and unlicensed users) and self-coexistence (between secondary users in multiple overlapped Wireless Regional Area Networks (WRANs) cells). To overcome the self-coexistence problem in WRANs, many Fixed Channel Assignment (FCA) techniques have been proposed but without accounting for the cooperation overhead and the randomly time-varying traffic loads in different cells. In this paper, we investigate the self-coexistence problem between secondary users in overlapped WRAN cells with the objective of improving network performance by employing an adaptive traffic-aware channel allocation strategy. The proposed method provides interference-free environment with minimum cooperation overhead and attempts at guaranteeing pre-specified blocking probability requirements. Simulation results reveal that the proposed algorithm provides a significant enhancement on system performance in terms of the number of served requests.
{"title":"Traffic-aware self-coexistence management in IEEE 802.22 WRAN systems","authors":"M. B. Hani, H. Salameh, Y. Jararweh, A. Bousselham","doi":"10.1109/IEEEGCC.2013.6705831","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705831","url":null,"abstract":"Co-existence of different wireless networks and interference management are challenging problems in a Cognitive Radio (CR) environment. There are two different types of co-existence; incumbent co-existence (between licensed and unlicensed users) and self-coexistence (between secondary users in multiple overlapped Wireless Regional Area Networks (WRANs) cells). To overcome the self-coexistence problem in WRANs, many Fixed Channel Assignment (FCA) techniques have been proposed but without accounting for the cooperation overhead and the randomly time-varying traffic loads in different cells. In this paper, we investigate the self-coexistence problem between secondary users in overlapped WRAN cells with the objective of improving network performance by employing an adaptive traffic-aware channel allocation strategy. The proposed method provides interference-free environment with minimum cooperation overhead and attempts at guaranteeing pre-specified blocking probability requirements. Simulation results reveal that the proposed algorithm provides a significant enhancement on system performance in terms of the number of served requests.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132613206","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705823
H. M. El-Deeb, A. Elserougi, A. Abdel-Khalik, S. Ahmed, A. Massoud
The fact distribution generation (DG) importance is growing rapidly in the recent years where the coupling between DG sources and the grid is done through inverters where exporting low distorted currents and high quality output power that copes with IEEE standards are main concerns. This paper demonstrates the regulation of the inverter current using proportional resonant (PR) controller that adapts to the grid voltage frequency to ensure reliable operation. Also to improve the quality of the output, an LCL passive filter is used as well as a demonstration of an alternative easier approach to achieve virtual damping of the resonance effect of the filter and construct an inner control loop improving robustness and stability simultaneously. The proposed concept has been simulated using Matlab Simulink for a 4KW IBDG.
{"title":"An adaptive PR controller for inverter-based distribution generation with active damped LCL filter","authors":"H. M. El-Deeb, A. Elserougi, A. Abdel-Khalik, S. Ahmed, A. Massoud","doi":"10.1109/IEEEGCC.2013.6705823","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705823","url":null,"abstract":"The fact distribution generation (DG) importance is growing rapidly in the recent years where the coupling between DG sources and the grid is done through inverters where exporting low distorted currents and high quality output power that copes with IEEE standards are main concerns. This paper demonstrates the regulation of the inverter current using proportional resonant (PR) controller that adapts to the grid voltage frequency to ensure reliable operation. Also to improve the quality of the output, an LCL passive filter is used as well as a demonstration of an alternative easier approach to achieve virtual damping of the resonance effect of the filter and construct an inner control loop improving robustness and stability simultaneously. The proposed concept has been simulated using Matlab Simulink for a 4KW IBDG.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121097122","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705796
F. Khan, A. Massoud, A. Gastli
With the increased involvement of Distributed Power Generation Systems (DPGSs) into the conventional power system, the structure has evolved and therefore has brought in various challenges albeit improving flexibility and smartness of the system. This paper addresses modeling one of these challenges where a Simulink model for inverter-based distributed generation (IBDG) active islanding detection technique is introduced. Out of the various types of active islanding detection methods, the modeling of the general electric islanding detection method which uses the positive feedback of the voltage or frequency at the point of common coupling (PCC) for the detection of an island is presented. This methodology is modeled and applied for an IBDG connected to a low voltage distribution network. The simulation results are presented for a 20kW, three-phase IBDG showing that the system is able to detect islanding and cease the current flow from the IBDG even under critical operating condition of a close matching between the power delivered by the inverter and the load demand (zero nondetection zone operation).
{"title":"A Simulink model of an active island detection technique for inverter-based distributed generation","authors":"F. Khan, A. Massoud, A. Gastli","doi":"10.1109/IEEEGCC.2013.6705796","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705796","url":null,"abstract":"With the increased involvement of Distributed Power Generation Systems (DPGSs) into the conventional power system, the structure has evolved and therefore has brought in various challenges albeit improving flexibility and smartness of the system. This paper addresses modeling one of these challenges where a Simulink model for inverter-based distributed generation (IBDG) active islanding detection technique is introduced. Out of the various types of active islanding detection methods, the modeling of the general electric islanding detection method which uses the positive feedback of the voltage or frequency at the point of common coupling (PCC) for the detection of an island is presented. This methodology is modeled and applied for an IBDG connected to a low voltage distribution network. The simulation results are presented for a 20kW, three-phase IBDG showing that the system is able to detect islanding and cease the current flow from the IBDG even under critical operating condition of a close matching between the power delivered by the inverter and the load demand (zero nondetection zone operation).","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116017706","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705799
S. I. Hussain, M. Abdallah, K. Qaraqe
Free space optical (FSO) communication is a promising technology to break the spectrum gridlock by exploiting the unregulated optical bands. Regardless of its many advantages, FSO severely suffers from poor performance over medium to long range links. This could be overcome by deploying relays in the system in serial or parallel fashion. For a dual-hop FSO system with multiple parallel relays, all-relay communication needs perfect synchronization among the participating relays, resulting in a very complex transmission process. This may be avoided by selecting a single relay based on a certain metric. However, due to peak and/or average power constrains in the system, power optimization among few “best” relays may provide an optimum performance. In this paper, we first investigate selective relaying in an FSO system with parallel relays operating in amplify-and-forward (AF) mode under log-normal fading. We derive outage probability of the system in case a single relay is selected on the basis of maximum end-to-end signal to noise ration (SNR). The latter part of the paper discusses a power optimization technique among few relays with peak and average power constraints. Simulation results show that in the absence of power constraints single relay selection performs better whereas power optimization among few selected relays is more efficient with power constraints.
{"title":"Power optimization and kth order selective relaying in free space optical networks","authors":"S. I. Hussain, M. Abdallah, K. Qaraqe","doi":"10.1109/IEEEGCC.2013.6705799","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705799","url":null,"abstract":"Free space optical (FSO) communication is a promising technology to break the spectrum gridlock by exploiting the unregulated optical bands. Regardless of its many advantages, FSO severely suffers from poor performance over medium to long range links. This could be overcome by deploying relays in the system in serial or parallel fashion. For a dual-hop FSO system with multiple parallel relays, all-relay communication needs perfect synchronization among the participating relays, resulting in a very complex transmission process. This may be avoided by selecting a single relay based on a certain metric. However, due to peak and/or average power constrains in the system, power optimization among few “best” relays may provide an optimum performance. In this paper, we first investigate selective relaying in an FSO system with parallel relays operating in amplify-and-forward (AF) mode under log-normal fading. We derive outage probability of the system in case a single relay is selected on the basis of maximum end-to-end signal to noise ration (SNR). The latter part of the paper discusses a power optimization technique among few relays with peak and average power constraints. Simulation results show that in the absence of power constraints single relay selection performs better whereas power optimization among few selected relays is more efficient with power constraints.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116949854","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 : 2013-11-01DOI: 10.1109/IEEEGCC.2013.6705775
S. Biswas, N. Mohan
The photovoltaic interface has several requirements: a high step-up ratio with clean input and output currents, high efficiency, compact size and ease of design. A novel two-port isolated Cuk topology is proposed in this paper which addresses all of these issues. It has a partial integrated magnetic structure which enables nearly-zero ripple input and output currents along with reduction in size and weight of the passive components. The transformer isolation provides the step-up ratio. The topology also combines an active-clamp structure which allows ZVS (zero-voltage switched) turn-on with passive snubber components which allow a ZCS (zero-current switched) turn-off of the active switches. The functionality of this quasi-resonant circuit is verified by simulating a PV circuit of typical specifications.
{"title":"A hybrid soft-switching integrated magnetic Ćuk converter for photovoltaic applications","authors":"S. Biswas, N. Mohan","doi":"10.1109/IEEEGCC.2013.6705775","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2013.6705775","url":null,"abstract":"The photovoltaic interface has several requirements: a high step-up ratio with clean input and output currents, high efficiency, compact size and ease of design. A novel two-port isolated Cuk topology is proposed in this paper which addresses all of these issues. It has a partial integrated magnetic structure which enables nearly-zero ripple input and output currents along with reduction in size and weight of the passive components. The transformer isolation provides the step-up ratio. The topology also combines an active-clamp structure which allows ZVS (zero-voltage switched) turn-on with passive snubber components which allow a ZCS (zero-current switched) turn-off of the active switches. The functionality of this quasi-resonant circuit is verified by simulating a PV circuit of typical specifications.","PeriodicalId":316751,"journal":{"name":"2013 7th IEEE GCC Conference and Exhibition (GCC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114973560","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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