Precoding methods at the Base Station (BS) can be used to deal with the inter-cell interference and improve the signal quality of the user especially at the cell edge. In this paper, a novel Zero-Forcing (ZF) precodin...Precoding methods at the Base Station (BS) can be used to deal with the inter-cell interference and improve the signal quality of the user especially at the cell edge. In this paper, a novel Zero-Forcing (ZF) precoding method is proposed and investigated for multi-cell Multi-Input Multi-Output (MIMO) systems. We propose a relaxed ZF precoding method by relaxing the ZF criterion to some degree so that the inter-cell interference may not be zero. Complexity analysis shows that compared with the conventional ZF method, the additional computation complexity for the proposed method is trivial. Simulation results show that the proposed relaxed ZF method has better performance than the conventional ZF method in terms of the sum-rate, especially at low Signal to Noise Ratio (SNR).展开更多
Led by 3GPP, industry and research communities are now investing tremendous efforts to develop advanced technologies in order to meet all related requirements of ITU“IMT 2020 and Beyond”for 5G wireless communication...Led by 3GPP, industry and research communities are now investing tremendous efforts to develop advanced technologies in order to meet all related requirements of ITU“IMT 2020 and Beyond”for 5G wireless communications in terms of enhanced mobile broadband (eMBB), massive machine?type communications (mMTC) and ultra?reli?able and low latency communications (URLLC). 3GPP has defined a new name for its planned standard proposal of 5G as“New Radio”(NR), which will be submitted to ITU for the official international 5G standard. The related technol?ogies for 5G NR can mainly be categorized into four areas, namely, 1) new mod?ulation and coding algorithms including multi?user superposition and shared access, enhanced waveform generation and advanced error?correction coding;展开更多
In recent years,there have been rapid advances in sensor,sensor-on-a-chip,MEMS and wireless communication technologies.Now.massively distributed sensor networks are capable of linking people and the physical world tog...In recent years,there have been rapid advances in sensor,sensor-on-a-chip,MEMS and wireless communication technologies.Now.massively distributed sensor networks are capable of linking people and the physical world together,providing platforms for information to be collected,shared,and processed in unprecedented ways.It is commonly recognized that sensor network research will lead to smart sentient spaces for our home and environment,work and leisure.It can help us to fight against disasters,protect us from hazards,and strengthen our defense.展开更多
This study investigates and analyzes the electric energy interruptions impact upon the residential sector in Riyadh city, the capital of the Kingdom of Saudi Arabia (KSA) resulting from severe power outages. The study...This study investigates and analyzes the electric energy interruptions impact upon the residential sector in Riyadh city, the capital of the Kingdom of Saudi Arabia (KSA) resulting from severe power outages. The study results show that this sector which constitutes about 54% of the Saudi Electric Company in the Central Operating Area (SEC-COA) will suffer enormous tangible and intangible losses should occur in specific times, seasons and last for longer durations. The results obtained for the costs of these energy interruptions reveal a time-dependent non-linear outage cost variation. In order to reduce these energy interruptions and hence mitigate their adverse effects and consequences, the study proposes proper practical measures and solutions without compromising the consumers’ needs and convenience.展开更多
This work attempts to investigate some practical measures that may reduce severe power outages that lead to energy curtailments. The first step of this attempt is to explore, from the consumer’s perspective, the adve...This work attempts to investigate some practical measures that may reduce severe power outages that lead to energy curtailments. The first step of this attempt is to explore, from the consumer’s perspective, the adverse effects of the energy curtailments that reflect enormous damages (tangible and intangible) to the residential sector in the city of Riyadh (the capital of the Kingdom of Saudi Arabia). The second step is to propose, analyze, and employ energy conservation strategies that lead to both energy conservation and costs savings. The study results show that some customers will suffer enormous tangible and intangible losses should these outages occur during specific times, seasons, and for prolonged durations. In order to reduce these power outages and hence mitigate their adverse effects and consequences, the study proposes proper practical measures and solutions without compromising the consumers’ needs, satisfaction, and convenience.展开更多
Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only ...Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only consider a per-subcarrier relay strategy,which treats each subcarrier as a separate channel,which results in significant sum rate loss,especially in fading environments.In this paper,a joint coding scheme over multiple subcarriers is involved for multipair users in two-way relay systems to obtain multiuser diversity.A generalized subcarrier pairing strategy is proposed to permit each user-pair to occupy different subcarriers during the two transmission phases,i.e.,the multiple access and broadcast phases.Moreover,a low complexity joint resource allocation scheme is proposed to improve the spectrum efficiency with an additional multi-user diversity gain.Some numerical simulations are finally provided to verify the efficacy of our proposal.展开更多
Nowadays session-based applications are one of the typical applications in the Internet,and people build such applications on clusters on concern of scalability. Scheduling in such a cluster is a key technology since ...Nowadays session-based applications are one of the typical applications in the Internet,and people build such applications on clusters on concern of scalability. Scheduling in such a cluster is a key technology since system performance depends on it. In this paper,we investigate the Round-Robin algorithm in the context of Session-based applications. An analyzing model for such sys-tems is proposed. Through both theoretical analysis and simulation,we find the main factor for system performance. And the result also shows that this algorithm shows up with significantly different performance under various conditions.展开更多
This paper presents the formulation of the possibilistic Renyi entropy function from the Renyi entropy function using the framework of Hanman-Anirban entropy function. The new entropy function is used to derive the in...This paper presents the formulation of the possibilistic Renyi entropy function from the Renyi entropy function using the framework of Hanman-Anirban entropy function. The new entropy function is used to derive the information set features from keystroke dynamics for the authentication of users. A new composite fuzzy classifier is also proposed based on Mamta-Hanman entropy function and applied on the Information Set based features. A comparison of the results of the proposed approach with those of Support Vector Machine and Random Forest classifier shows that the new classifier outperforms the other two.展开更多
HWANG Jenq-Neng received his Ph.D. degree from the University of Southern California, USA. In the summer of 1989, Dr. HWANG joined the De- partment of Electrical Engineering of the Universi- ty of Washington in Seattl...HWANG Jenq-Neng received his Ph.D. degree from the University of Southern California, USA. In the summer of 1989, Dr. HWANG joined the De- partment of Electrical Engineering of the Universi- ty of Washington in Seattle, USA, where he has been promoted to Full Professor since 1999. He served as the Associate Chair for Research fi＇om 2003 to 2005, and from 2011-2015. He is current- ly the Associate Chair for Global Affairs and Inter- national Development in the EE Depamnent. Hehas written more than 330 journal papers, conference papers and book chapters in the areas of machine learning, muhimedia signal processing, and muhimedia system integration and networking, including an au- thored textbook on ＂Multimedia Networking： from Theory to Practice,＂ published by Cambridge University Press. Dr. HWANG has close work- ing relationship with the industry on muhimedia signal processing and nmltimedia networking.展开更多
Inverter-dominated isolated/islanded microgrids(IDIMGs)lack infinite buses and have low inertia,resulting in higher sensitivity to disturbances and reduced stability compared to grid-tied systems.Enhanc-ing the resili...Inverter-dominated isolated/islanded microgrids(IDIMGs)lack infinite buses and have low inertia,resulting in higher sensitivity to disturbances and reduced stability compared to grid-tied systems.Enhanc-ing the resilience of IDIMGs can be achieved by maxim-izing the system loadability and/or mitigating the expected disturbances such as line switching operations.This paper proposes a two-stage framework based on the deployment of mobile energy storage(MES)to enhance the resilience of IDIMGs.In the first stage,the network configuration and deployment of MES are optimized to maximize the system loadability.The proposed formulation for this stage is a stochastic multi-period mixed-integer nonlinear program(MINLP)that maximizes a weighted sum of minimax loadabilities.In the second stage,transitional locations of MES,line-exchange execution sequence,and droop control of dispatchable sources are jointly optimized to mitigate line-switching disturbances that occur when transitioning to the new network configuration obtained in the first stage.The second stage model is a multi-objective MINLP.The proposed models are solved within the gen-eral algebraic modeling system(GAMS),utilizing a mod-ified IEEE 33-bus system.Simulations are conducted to assess the significance of each proposed model,and the results reveal remarkable improvements in system loadability with the utilization of the first-stage model and significant reductions in the total switched power with the adoption of the second-stage model.展开更多
We report on fused-polished fiber couplers with a new fabrication method. This structure so fabricated is promising while achieving high-performance all-fiber WDM devices. Potential advantages and prospects of our wor...We report on fused-polished fiber couplers with a new fabrication method. This structure so fabricated is promising while achieving high-performance all-fiber WDM devices. Potential advantages and prospects of our works are presented.展开更多
Reported are fiber de-multiplexers based on side-polished fibers with a long interaction length and intra-core fiber Bragg gratings. In conjunction with the silicon processing technologies, we demonstrate fiber filter...Reported are fiber de-multiplexers based on side-polished fibers with a long interaction length and intra-core fiber Bragg gratings. In conjunction with the silicon processing technologies, we demonstrate fiber filters and advantages of our approaches are addressed.展开更多
基金Supported by Shantou Youth Scientific Research Fund(No.YR11002)Distinguished Youth Fund in Higher Education of Guangdong Province(No.2012LYM_0064)
文摘Precoding methods at the Base Station (BS) can be used to deal with the inter-cell interference and improve the signal quality of the user especially at the cell edge. In this paper, a novel Zero-Forcing (ZF) precoding method is proposed and investigated for multi-cell Multi-Input Multi-Output (MIMO) systems. We propose a relaxed ZF precoding method by relaxing the ZF criterion to some degree so that the inter-cell interference may not be zero. Complexity analysis shows that compared with the conventional ZF method, the additional computation complexity for the proposed method is trivial. Simulation results show that the proposed relaxed ZF method has better performance than the conventional ZF method in terms of the sum-rate, especially at low Signal to Noise Ratio (SNR).
文摘Led by 3GPP, industry and research communities are now investing tremendous efforts to develop advanced technologies in order to meet all related requirements of ITU“IMT 2020 and Beyond”for 5G wireless communications in terms of enhanced mobile broadband (eMBB), massive machine?type communications (mMTC) and ultra?reli?able and low latency communications (URLLC). 3GPP has defined a new name for its planned standard proposal of 5G as“New Radio”(NR), which will be submitted to ITU for the official international 5G standard. The related technol?ogies for 5G NR can mainly be categorized into four areas, namely, 1) new mod?ulation and coding algorithms including multi?user superposition and shared access, enhanced waveform generation and advanced error?correction coding;
文摘In recent years,there have been rapid advances in sensor,sensor-on-a-chip,MEMS and wireless communication technologies.Now.massively distributed sensor networks are capable of linking people and the physical world together,providing platforms for information to be collected,shared,and processed in unprecedented ways.It is commonly recognized that sensor network research will lead to smart sentient spaces for our home and environment,work and leisure.It can help us to fight against disasters,protect us from hazards,and strengthen our defense.
文摘This study investigates and analyzes the electric energy interruptions impact upon the residential sector in Riyadh city, the capital of the Kingdom of Saudi Arabia (KSA) resulting from severe power outages. The study results show that this sector which constitutes about 54% of the Saudi Electric Company in the Central Operating Area (SEC-COA) will suffer enormous tangible and intangible losses should occur in specific times, seasons and last for longer durations. The results obtained for the costs of these energy interruptions reveal a time-dependent non-linear outage cost variation. In order to reduce these energy interruptions and hence mitigate their adverse effects and consequences, the study proposes proper practical measures and solutions without compromising the consumers’ needs and convenience.
文摘This work attempts to investigate some practical measures that may reduce severe power outages that lead to energy curtailments. The first step of this attempt is to explore, from the consumer’s perspective, the adverse effects of the energy curtailments that reflect enormous damages (tangible and intangible) to the residential sector in the city of Riyadh (the capital of the Kingdom of Saudi Arabia). The second step is to propose, analyze, and employ energy conservation strategies that lead to both energy conservation and costs savings. The study results show that some customers will suffer enormous tangible and intangible losses should these outages occur during specific times, seasons, and for prolonged durations. In order to reduce these power outages and hence mitigate their adverse effects and consequences, the study proposes proper practical measures and solutions without compromising the consumers’ needs, satisfaction, and convenience.
基金supported by the National Natural Science Foundation of China(NSFC)(No.61501527)State’s Key Project of Research and Development Plan(No.2016YFE0122900-3)+1 种基金the Fundamental Research Funds for the Central Universities,Basic Research Foundation of Science Technology and Innovation Commission of Shenzhen Municipality(No.JCYJ20150630153033410)SYSU-CMU Shunde International Joint Research Institute and 2016 Major Project of Collaborative Innovation in Guangzhou(Research and Application of Ground Satellite Communicaiton Systems for Space Broadband Information Networks)
文摘Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only consider a per-subcarrier relay strategy,which treats each subcarrier as a separate channel,which results in significant sum rate loss,especially in fading environments.In this paper,a joint coding scheme over multiple subcarriers is involved for multipair users in two-way relay systems to obtain multiuser diversity.A generalized subcarrier pairing strategy is proposed to permit each user-pair to occupy different subcarriers during the two transmission phases,i.e.,the multiple access and broadcast phases.Moreover,a low complexity joint resource allocation scheme is proposed to improve the spectrum efficiency with an additional multi-user diversity gain.Some numerical simulations are finally provided to verify the efficacy of our proposal.
文摘Nowadays session-based applications are one of the typical applications in the Internet,and people build such applications on clusters on concern of scalability. Scheduling in such a cluster is a key technology since system performance depends on it. In this paper,we investigate the Round-Robin algorithm in the context of Session-based applications. An analyzing model for such sys-tems is proposed. Through both theoretical analysis and simulation,we find the main factor for system performance. And the result also shows that this algorithm shows up with significantly different performance under various conditions.
文摘This paper presents the formulation of the possibilistic Renyi entropy function from the Renyi entropy function using the framework of Hanman-Anirban entropy function. The new entropy function is used to derive the information set features from keystroke dynamics for the authentication of users. A new composite fuzzy classifier is also proposed based on Mamta-Hanman entropy function and applied on the Information Set based features. A comparison of the results of the proposed approach with those of Support Vector Machine and Random Forest classifier shows that the new classifier outperforms the other two.
文摘HWANG Jenq-Neng received his Ph.D. degree from the University of Southern California, USA. In the summer of 1989, Dr. HWANG joined the De- partment of Electrical Engineering of the Universi- ty of Washington in Seattle, USA, where he has been promoted to Full Professor since 1999. He served as the Associate Chair for Research fi＇om 2003 to 2005, and from 2011-2015. He is current- ly the Associate Chair for Global Affairs and Inter- national Development in the EE Depamnent. Hehas written more than 330 journal papers, conference papers and book chapters in the areas of machine learning, muhimedia signal processing, and muhimedia system integration and networking, including an au- thored textbook on ＂Multimedia Networking： from Theory to Practice,＂ published by Cambridge University Press. Dr. HWANG has close work- ing relationship with the industry on muhimedia signal processing and nmltimedia networking.
文摘Inverter-dominated isolated/islanded microgrids(IDIMGs)lack infinite buses and have low inertia,resulting in higher sensitivity to disturbances and reduced stability compared to grid-tied systems.Enhanc-ing the resilience of IDIMGs can be achieved by maxim-izing the system loadability and/or mitigating the expected disturbances such as line switching operations.This paper proposes a two-stage framework based on the deployment of mobile energy storage(MES)to enhance the resilience of IDIMGs.In the first stage,the network configuration and deployment of MES are optimized to maximize the system loadability.The proposed formulation for this stage is a stochastic multi-period mixed-integer nonlinear program(MINLP)that maximizes a weighted sum of minimax loadabilities.In the second stage,transitional locations of MES,line-exchange execution sequence,and droop control of dispatchable sources are jointly optimized to mitigate line-switching disturbances that occur when transitioning to the new network configuration obtained in the first stage.The second stage model is a multi-objective MINLP.The proposed models are solved within the gen-eral algebraic modeling system(GAMS),utilizing a mod-ified IEEE 33-bus system.Simulations are conducted to assess the significance of each proposed model,and the results reveal remarkable improvements in system loadability with the utilization of the first-stage model and significant reductions in the total switched power with the adoption of the second-stage model.
文摘We report on fused-polished fiber couplers with a new fabrication method. This structure so fabricated is promising while achieving high-performance all-fiber WDM devices. Potential advantages and prospects of our works are presented.
文摘Reported are fiber de-multiplexers based on side-polished fibers with a long interaction length and intra-core fiber Bragg gratings. In conjunction with the silicon processing technologies, we demonstrate fiber filters and advantages of our approaches are addressed.
