Anh Hoàng - Academia.edu (original) (raw)

Papers by Anh Hoàng

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, 2006

Page 1. The 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communi... more Page 1. The 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'06) A TWO-PHASE CHANNEL AND POWER ALLOCATION SCHEME FOR COGNITIVE RADIO NETWORKS ...

2008 IEEE Wireless Communications and Networking Conference, 2008

Analytical formulations of dynamic spectrum access (DSA) with perfect sensing (PS) and imperfect ... more Analytical formulations of dynamic spectrum access (DSA) with perfect sensing (PS) and imperfect sensing (IS) for two radio systems are presented. The DSA with PS model is solved explicitly using a two-dimensional Markov chain, respectively, while the DSA with IS model is solved numerically using a two-dimensional Markov chain. Grades of service (GoSs) like system airtime and blocking probabilities are

2009 IEEE Wireless Communications and Networking Conference, 2009

Page 1. Design and Analysis for an 802.11-based Cognitive Radio Network Anh Tuan Hoang, David Tun... more Page 1. Design and Analysis for an 802.11-based Cognitive Radio Network Anh Tuan Hoang, David Tung Chong Wong, and Ying-Chang Liang Institute for Infocomm Research, A-Star, Singapore Email: {athoang, wongtc, ycliang}@i2r.a-star.edu.sg ...

2007 IEEE Wireless Communications and Networking Conference, 2007

Abstract We consider a system where a licensed radio spectrum is shared by two networks, namely t... more Abstract We consider a system where a licensed radio spectrum is shared by two networks, namely the primary network and the secondary network. The spectrum is licensed to the primary network, however the secondary network makes opportunistic access of the ...

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007

We consider a cognitive radio (CR) network that makes opportunistic use of a set of channels lice... more We consider a cognitive radio (CR) network that makes opportunistic use of a set of channels licensed to some primary network. During its operation, the CR network is required to carry out spectrum sensing to detect active primary users, thereby avoiding interfering with them. However, spectrum sensing can cause negative effects to the performance of the CR network, as all

IEEE Transactions on Wireless Communications, 2008

This paper focuses on sensing-throughput tradeoffs for overlay cognitive radio networks. The goal... more This paper focuses on sensing-throughput tradeoffs for overlay cognitive radio networks. The goal is to maximize the opportunistic secondary user throughput, by limiting the disturbance to primary user activity. Specifically, by assuming that a Poisson birth-death process characterizes the primary user traffic, the sensing-time bounds are imposed by granting enough accuracy to the detection of primary user activity, while the optimum duration for secondary user transmissions is obtained by maximizing analytical expressions for the secondary user average capacity. This paper also clarifies some subtle differences with the existing literature on the subject, which may lead to misleading results. Computer simulations corroborate the proposed theoretical findings.

IEEE Transactions on Wireless Communications, 2009

This paper considers a scenario in which a secondary user (SU) opportunistically accesses a chann... more This paper considers a scenario in which a secondary user (SU) opportunistically accesses a channel allocated to some primary network (PN) that switches between idle and active states in a time-slotted manner. At the beginning of each time slot, SU can choose to stay idle or to carry out spectrum sensing to detect the state of PN. If PN is detected to be idle, SU can carry out data transmission. Spectrum sensing consumes time and energy and introduces false alarms and mis-detections. The objective is to dynamically decide, for each time slot, whether SU should stay idle or carry out sensing, and if so, for how long, to maximize the expected reward. We formulate this as a partially observable Markov decision process and prove important properties of the optimal control policies. Heuristic control policies with low complexity and good performance are also proposed. Numerical results show the significant performance gain of our dynamic control approach for opportunistic spectrum access.

IEEE Transactions on Wireless Communications, 2008

IEEE Transactions on Mobile Computing, 2010

We consider a point-to-multipoint cognitive radio network that shares a set of channels with a pr... more We consider a point-to-multipoint cognitive radio network that shares a set of channels with a primary network. Within the cognitive radio network, a base station controls and supports a set of fixed-location wireless subscribers. The objective is to maximize the throughput of the cognitive network while not affecting the performance of primary users. Both downlink and uplink transmission scenarios in the cognitive network are considered. For both scenarios, we propose two-phase mixed distributed/centralized control algorithms that require minimal cooperation between cognitive and primary devices. In the first phase, a distributed power updating process is employed at the cognitive and primary nodes to maximize the coverage of the cognitive network while always maintaining the constrained signal to interference plus noise ratio of primary transmissions. In the second phase, centralized channel assignment is carried out within the cognitive network to maximize its throughput. Numerical results are obtained for the behaviors and performance of our proposed algorithms. Index Terms-Wireless communications, dynamic spectrum access, distributed control, joint power control and channel allocation.

Hoàng Anh Hoàng, Lê P. Nga, Trần T.T. Xuân, Nguyễn T. Trung, Tu Q. Vinh, Andrew Millard, Phan T. ... more Hoàng Anh Hoàng, Lê P. Nga, Trần T.T. Xuân, Nguyễn T. Trung, Tu Q. Vinh, Andrew Millard, Phan T. Huyen, Đặng T.H. Oanh 1 Khoa Kỹ thuật Hóa học, Trường Đại học Bách Khoa Đại học quốc gia Thành phố Hồ Chí Minh 2 Institut Jean-Pierre Bourgin INRAE, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, Pháp 3 Department of Genetics and Genome Biology, University of Leicester, Leicester, Anh Quốc 4 Khoa Thủy sản, Trường Đại học Cần Thơ

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, 2006

Page 1. The 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communi... more Page 1. The 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'06) A TWO-PHASE CHANNEL AND POWER ALLOCATION SCHEME FOR COGNITIVE RADIO NETWORKS ...

2008 IEEE Wireless Communications and Networking Conference, 2008

Analytical formulations of dynamic spectrum access (DSA) with perfect sensing (PS) and imperfect ... more Analytical formulations of dynamic spectrum access (DSA) with perfect sensing (PS) and imperfect sensing (IS) for two radio systems are presented. The DSA with PS model is solved explicitly using a two-dimensional Markov chain, respectively, while the DSA with IS model is solved numerically using a two-dimensional Markov chain. Grades of service (GoSs) like system airtime and blocking probabilities are

2009 IEEE Wireless Communications and Networking Conference, 2009

Page 1. Design and Analysis for an 802.11-based Cognitive Radio Network Anh Tuan Hoang, David Tun... more Page 1. Design and Analysis for an 802.11-based Cognitive Radio Network Anh Tuan Hoang, David Tung Chong Wong, and Ying-Chang Liang Institute for Infocomm Research, A-Star, Singapore Email: {athoang, wongtc, ycliang}@i2r.a-star.edu.sg ...

2007 IEEE Wireless Communications and Networking Conference, 2007

Abstract We consider a system where a licensed radio spectrum is shared by two networks, namely t... more Abstract We consider a system where a licensed radio spectrum is shared by two networks, namely the primary network and the secondary network. The spectrum is licensed to the primary network, however the secondary network makes opportunistic access of the ...

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007

We consider a cognitive radio (CR) network that makes opportunistic use of a set of channels lice... more We consider a cognitive radio (CR) network that makes opportunistic use of a set of channels licensed to some primary network. During its operation, the CR network is required to carry out spectrum sensing to detect active primary users, thereby avoiding interfering with them. However, spectrum sensing can cause negative effects to the performance of the CR network, as all

IEEE Transactions on Wireless Communications, 2008

This paper focuses on sensing-throughput tradeoffs for overlay cognitive radio networks. The goal... more This paper focuses on sensing-throughput tradeoffs for overlay cognitive radio networks. The goal is to maximize the opportunistic secondary user throughput, by limiting the disturbance to primary user activity. Specifically, by assuming that a Poisson birth-death process characterizes the primary user traffic, the sensing-time bounds are imposed by granting enough accuracy to the detection of primary user activity, while the optimum duration for secondary user transmissions is obtained by maximizing analytical expressions for the secondary user average capacity. This paper also clarifies some subtle differences with the existing literature on the subject, which may lead to misleading results. Computer simulations corroborate the proposed theoretical findings.

IEEE Transactions on Wireless Communications, 2009

This paper considers a scenario in which a secondary user (SU) opportunistically accesses a chann... more This paper considers a scenario in which a secondary user (SU) opportunistically accesses a channel allocated to some primary network (PN) that switches between idle and active states in a time-slotted manner. At the beginning of each time slot, SU can choose to stay idle or to carry out spectrum sensing to detect the state of PN. If PN is detected to be idle, SU can carry out data transmission. Spectrum sensing consumes time and energy and introduces false alarms and mis-detections. The objective is to dynamically decide, for each time slot, whether SU should stay idle or carry out sensing, and if so, for how long, to maximize the expected reward. We formulate this as a partially observable Markov decision process and prove important properties of the optimal control policies. Heuristic control policies with low complexity and good performance are also proposed. Numerical results show the significant performance gain of our dynamic control approach for opportunistic spectrum access.

IEEE Transactions on Wireless Communications, 2008

IEEE Transactions on Mobile Computing, 2010

We consider a point-to-multipoint cognitive radio network that shares a set of channels with a pr... more We consider a point-to-multipoint cognitive radio network that shares a set of channels with a primary network. Within the cognitive radio network, a base station controls and supports a set of fixed-location wireless subscribers. The objective is to maximize the throughput of the cognitive network while not affecting the performance of primary users. Both downlink and uplink transmission scenarios in the cognitive network are considered. For both scenarios, we propose two-phase mixed distributed/centralized control algorithms that require minimal cooperation between cognitive and primary devices. In the first phase, a distributed power updating process is employed at the cognitive and primary nodes to maximize the coverage of the cognitive network while always maintaining the constrained signal to interference plus noise ratio of primary transmissions. In the second phase, centralized channel assignment is carried out within the cognitive network to maximize its throughput. Numerical results are obtained for the behaviors and performance of our proposed algorithms. Index Terms-Wireless communications, dynamic spectrum access, distributed control, joint power control and channel allocation.

Hoàng Anh Hoàng, Lê P. Nga, Trần T.T. Xuân, Nguyễn T. Trung, Tu Q. Vinh, Andrew Millard, Phan T. ... more Hoàng Anh Hoàng, Lê P. Nga, Trần T.T. Xuân, Nguyễn T. Trung, Tu Q. Vinh, Andrew Millard, Phan T. Huyen, Đặng T.H. Oanh 1 Khoa Kỹ thuật Hóa học, Trường Đại học Bách Khoa Đại học quốc gia Thành phố Hồ Chí Minh 2 Institut Jean-Pierre Bourgin INRAE, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, Pháp 3 Department of Genetics and Genome Biology, University of Leicester, Leicester, Anh Quốc 4 Khoa Thủy sản, Trường Đại học Cần Thơ