Tamer Elbatt - Academia.edu (original) (raw)

Papers by Tamer Elbatt

Research paper thumbnail of Priority-based dynamic packet reservation for TDMA wireless networks

2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277), 2001

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Research paper thumbnail of Multi-modal MAC design for energy-efficient wireless networks

IEEE International Conference on Mobile Adhoc and Sensor Systems Conference, 2005., 2005

Abstract In this paper we explore the design of multi-modal MAC for wireless ad hoc and sensor ne... more Abstract In this paper we explore the design of multi-modal MAC for wireless ad hoc and sensor networks that dynamically adapt its behavior in order to minimize the energy to delivery ratio under a wide variety of network loads. The prime motivation is to balance the ...

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Research paper thumbnail of Multi-tier mobile ad hoc routing

2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484), 2003

ABSTRACT We present a new approach for routing in multi-tier heterogeneous wireless mobile ad hoc... more ABSTRACT We present a new approach for routing in multi-tier heterogeneous wireless mobile ad hoc networks. This protocol, namely multi-virtual backbone protocol (MVP), naturally addresses key challenges arising from multi-tier wireless networks such as the coverage asymmetry and node heterogeneity. It also supports various QoS needs by constructing and maintaining QoS-specific virtual backbone infrastructure. A detailed algorithm is presented and preliminary simulation results are discussed.

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Research paper thumbnail of On the role of vehicular mobility in cooperative content caching

2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2012

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Research paper thumbnail of Research Tools for 3-D Mobile Ad-hoc Networking with Directional Antenna

We present the new simulation and visualization tools tailored for 3-dimensional mobile ad hoc ne... more We present the new simulation and visualization tools tailored for 3-dimensional mobile ad hoc networking (MANET) research based on ns2 and nam.

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Research paper thumbnail of Degrees of Freedom for separated and non-separated Half-Duplex Cellular MIMO Two-way Relay Channels

We study a cellular setting in which an introduced multiple-antenna relay station (RS) can possib... more We study a cellular setting in which an introduced multiple-antenna relay station (RS) can possibly assist the bidi-rectional communication between a multiple-antenna base station (BS) and a set of single-antenna mobile stations (MSs). Through a proposed six-phase communication protocol with arbitrary number of antennas and MSs, we characterize the maximum number of degrees of freedom (DoF) that can be attained when the BS-MSs direct link is active or down. When the direct link is available, we show that the introduction of a multiple-antenna RS cannot increase the maximum DoF regardless of the number of antennas it is equipped with. In the absence of a BS-MSs direct link, the maximum DoF can be limited by the number of RS antennas since all ongoing communication takes place through the RS. It is also shown that the characterized maximum DoF is achieved via recently proposed network-coding based two-way relaying techniques. Finally, we conclude that a widely used two-phase multiple ...

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Research paper thumbnail of Joint Power Allocation and Beamforming for Multiuser MIMO Two-way Relay Networks

In this paper, a multiuser cellular two-way relaying scenario is considered where multiple single... more In this paper, a multiuser cellular two-way relaying scenario is considered where multiple single-antenna mobile stations (MSs) and one multiple-antenna base station (BS) com-municate, bidirectionally, via one half-duplex multiple-antenna relay station (RS). Furthermore, the case when the number of antennas at the RS is not sufficient to decode the individual messages is addressed. For this case, a two-phase two-way relaying scenario is considered. In the first phase, the multiple access, a minimum Mean Square Error (MSE) optimization problem is formulated which is found to be non-convex. Thus, an iterative scheme is proposed to compute the MS transmit powers, the BS beamforming vectors, and the corresponding RS linear receivers to minimize the maximum MSE for multiple pairs subject to power constraints on the transmitting terminals. In the second phase, the broadcast phase, the beamforming vectors at the RS are designed to minimize the maximum MSE at the MSs subject to relay power ...

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Research paper thumbnail of Interference-based Optimal Power-efficient Access Scheme for Cognitive Radio Networks

In this paper, we propose a new optimization-based access strategy of multipacket reception (MPR)... more In this paper, we propose a new optimization-based access strategy of multipacket reception (MPR) channel for multiple secondary users (SUs) accessing the primary user (PU) spectrum opportunistically. We devise an analytical model that realizes the multipacket access strategy of SUs that maximizes the throughput of individual backlogged SUs subject to queue stability of the PU. All the network receiving nodes have MPR capability. We aim at maximizing the throughput of the individual SUs such that the PU's queue is maintained stable. Moreover, we are interested in providing an energy efficient cognitive scheme. Therefore, we include energy constraints on the PU and SU average transmitted energy to the optimization problem. Each SU accesses the medium with certain probability that depends on the PU's activity, i.e., active or inactive. The results show a significant gain of the proposed scheme relative to other well-known access schemes up to $ 44 \% $ in terms of SU throughput.

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Research paper thumbnail of Towards energy efficient relay placement and load balancing in future wireless networks

2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014

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Research paper thumbnail of Effective capacity of delay constrained cognitive radio links exploiting primary feedback

In this paper, we analyze the performance of a secondary link in a cognitive radio (CR) system op... more In this paper, we analyze the performance of a secondary link in a cognitive radio (CR) system operating under statistical quality of service (QoS) delay constraints. In particular, we quantify analytically the performance improvement for the secondary user (SU) when applying a feedback based sensing scheme under the “SINR Interference” model. We leverage the concept of effective capacity (EC) introduced earlier in the literature to quantify the wireless link performance under delay constraints, in an attempt to opportunistically support real-time applications. Towards this objective, we study a two-link network, a single secondary link and a primary network abstracted to a single primary link, with and without primary feedback exploitation. We analytically prove that exploiting primary feedback at the secondary transmitter improves the EC of the secondary user and decreases the secondary user average transmitted power. Finally, we present numerical results that support our analytic...

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Research paper thumbnail of On the Stable Throughput of Cooperative Cognitive Radio Networks with Finite Relaying Buffer

In this paper, we study the problem of cooperative communications in cognitive radio systems wher... more In this paper, we study the problem of cooperative communications in cognitive radio systems where the secondary user has limited relaying room for the overheard primary packets. More specifically, we characterize the stable throughput region of a cognitive radio network with a finite relaying buffer at the secondary user. Towards this objective, we formulate a constrained optimization problem for maximizing the secondary user throughput while guaranteeing the stability of the primary user queue. We consider a general cooperation policy where the packet admission and queue selection probabilities, at the secondary user, are both dependent on the state (length) of the finite relaying buffer. Despite the sheer complexity of the optimization problem, attributed to its non-convexity, we transform it to a linear program. Our numerical results reveal a number of valuable insights, e.g., it is always mutually beneficial to cooperate in delivering the primary packets in terms of expanding t...

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Research paper thumbnail of On the stable throughput of cooperative cognitive radio networks with finite relaying buffer

2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014

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Research paper thumbnail of Towards optimal power control for delay-constrained cognitive radio networks

2015 International Conference on Computing, Networking and Communications (ICNC), 2015

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Research paper thumbnail of Interference-based optimal power-efficient access scheme for cognitive radio networks

2015 International Conference on Computing, Networking and Communications (ICNC), 2015

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Research paper thumbnail of Power management for throughput enhancement in wireless ad-hoc networks

2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record, 2000

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Research paper thumbnail of Jitter recovery strategies for multimedia traffic in ATM networks

Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference, 1996

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Research paper thumbnail of Proactive scheduling for content pre-fetching in mobile networks

2014 IEEE International Conference on Communications (ICC), 2014

ABSTRACT The global adoption of smart phones has raised major concerns about a potential surge in... more ABSTRACT The global adoption of smart phones has raised major concerns about a potential surge in the wireless traffic due to the excessive demand on multimedia services. This ever increasing demand is projected to cause significant congestions and degrade the quality of service for network users. In this paper, we develop a proactive caching framework that utilizes the predictability of the mobile user behavior to offload predictable traffic through the WiFi networks ahead of time. First, we formulate the proactive scheduling problem with the objective of maximizing the user-content hit ratio subject to constrains stemming from the user behavioral models. Second, we propose a quadratic-complexity (in the number of slots per day) greedy, yet, high performance heuristic algorithm that pinpoints the best download slot for each content item to attain maximal hit ratio. We confirm the merits of the proposed scheme based on the traces of a real dataset leveraging a large number of smart phone users who consistently utilized our framework for two months.

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Research paper thumbnail of DSRC Channel Fading Analysis from Empirical Measurement

2006 First International Conference on Communications and Networking in China, 2006

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Research paper thumbnail of Improved spectrum mobility using virtual reservation in collaborative cognitive radio networks

2013 IEEE Symposium on Computers and Communications (ISCC), 2013

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Research paper thumbnail of Fractional sequential sensing for energy efficient cooperative cognitive radio networks

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2014

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Research paper thumbnail of Priority-based dynamic packet reservation for TDMA wireless networks

2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277), 2001

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Research paper thumbnail of Multi-modal MAC design for energy-efficient wireless networks

IEEE International Conference on Mobile Adhoc and Sensor Systems Conference, 2005., 2005

Abstract In this paper we explore the design of multi-modal MAC for wireless ad hoc and sensor ne... more Abstract In this paper we explore the design of multi-modal MAC for wireless ad hoc and sensor networks that dynamically adapt its behavior in order to minimize the energy to delivery ratio under a wide variety of network loads. The prime motivation is to balance the ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Multi-tier mobile ad hoc routing

2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484), 2003

ABSTRACT We present a new approach for routing in multi-tier heterogeneous wireless mobile ad hoc... more ABSTRACT We present a new approach for routing in multi-tier heterogeneous wireless mobile ad hoc networks. This protocol, namely multi-virtual backbone protocol (MVP), naturally addresses key challenges arising from multi-tier wireless networks such as the coverage asymmetry and node heterogeneity. It also supports various QoS needs by constructing and maintaining QoS-specific virtual backbone infrastructure. A detailed algorithm is presented and preliminary simulation results are discussed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On the role of vehicular mobility in cooperative content caching

2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Research Tools for 3-D Mobile Ad-hoc Networking with Directional Antenna

We present the new simulation and visualization tools tailored for 3-dimensional mobile ad hoc ne... more We present the new simulation and visualization tools tailored for 3-dimensional mobile ad hoc networking (MANET) research based on ns2 and nam.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Degrees of Freedom for separated and non-separated Half-Duplex Cellular MIMO Two-way Relay Channels

We study a cellular setting in which an introduced multiple-antenna relay station (RS) can possib... more We study a cellular setting in which an introduced multiple-antenna relay station (RS) can possibly assist the bidi-rectional communication between a multiple-antenna base station (BS) and a set of single-antenna mobile stations (MSs). Through a proposed six-phase communication protocol with arbitrary number of antennas and MSs, we characterize the maximum number of degrees of freedom (DoF) that can be attained when the BS-MSs direct link is active or down. When the direct link is available, we show that the introduction of a multiple-antenna RS cannot increase the maximum DoF regardless of the number of antennas it is equipped with. In the absence of a BS-MSs direct link, the maximum DoF can be limited by the number of RS antennas since all ongoing communication takes place through the RS. It is also shown that the characterized maximum DoF is achieved via recently proposed network-coding based two-way relaying techniques. Finally, we conclude that a widely used two-phase multiple ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Joint Power Allocation and Beamforming for Multiuser MIMO Two-way Relay Networks

In this paper, a multiuser cellular two-way relaying scenario is considered where multiple single... more In this paper, a multiuser cellular two-way relaying scenario is considered where multiple single-antenna mobile stations (MSs) and one multiple-antenna base station (BS) com-municate, bidirectionally, via one half-duplex multiple-antenna relay station (RS). Furthermore, the case when the number of antennas at the RS is not sufficient to decode the individual messages is addressed. For this case, a two-phase two-way relaying scenario is considered. In the first phase, the multiple access, a minimum Mean Square Error (MSE) optimization problem is formulated which is found to be non-convex. Thus, an iterative scheme is proposed to compute the MS transmit powers, the BS beamforming vectors, and the corresponding RS linear receivers to minimize the maximum MSE for multiple pairs subject to power constraints on the transmitting terminals. In the second phase, the broadcast phase, the beamforming vectors at the RS are designed to minimize the maximum MSE at the MSs subject to relay power ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Interference-based Optimal Power-efficient Access Scheme for Cognitive Radio Networks

In this paper, we propose a new optimization-based access strategy of multipacket reception (MPR)... more In this paper, we propose a new optimization-based access strategy of multipacket reception (MPR) channel for multiple secondary users (SUs) accessing the primary user (PU) spectrum opportunistically. We devise an analytical model that realizes the multipacket access strategy of SUs that maximizes the throughput of individual backlogged SUs subject to queue stability of the PU. All the network receiving nodes have MPR capability. We aim at maximizing the throughput of the individual SUs such that the PU's queue is maintained stable. Moreover, we are interested in providing an energy efficient cognitive scheme. Therefore, we include energy constraints on the PU and SU average transmitted energy to the optimization problem. Each SU accesses the medium with certain probability that depends on the PU's activity, i.e., active or inactive. The results show a significant gain of the proposed scheme relative to other well-known access schemes up to $ 44 \% $ in terms of SU throughput.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Towards energy efficient relay placement and load balancing in future wireless networks

2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effective capacity of delay constrained cognitive radio links exploiting primary feedback

In this paper, we analyze the performance of a secondary link in a cognitive radio (CR) system op... more In this paper, we analyze the performance of a secondary link in a cognitive radio (CR) system operating under statistical quality of service (QoS) delay constraints. In particular, we quantify analytically the performance improvement for the secondary user (SU) when applying a feedback based sensing scheme under the “SINR Interference” model. We leverage the concept of effective capacity (EC) introduced earlier in the literature to quantify the wireless link performance under delay constraints, in an attempt to opportunistically support real-time applications. Towards this objective, we study a two-link network, a single secondary link and a primary network abstracted to a single primary link, with and without primary feedback exploitation. We analytically prove that exploiting primary feedback at the secondary transmitter improves the EC of the secondary user and decreases the secondary user average transmitted power. Finally, we present numerical results that support our analytic...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On the Stable Throughput of Cooperative Cognitive Radio Networks with Finite Relaying Buffer

In this paper, we study the problem of cooperative communications in cognitive radio systems wher... more In this paper, we study the problem of cooperative communications in cognitive radio systems where the secondary user has limited relaying room for the overheard primary packets. More specifically, we characterize the stable throughput region of a cognitive radio network with a finite relaying buffer at the secondary user. Towards this objective, we formulate a constrained optimization problem for maximizing the secondary user throughput while guaranteeing the stability of the primary user queue. We consider a general cooperation policy where the packet admission and queue selection probabilities, at the secondary user, are both dependent on the state (length) of the finite relaying buffer. Despite the sheer complexity of the optimization problem, attributed to its non-convexity, we transform it to a linear program. Our numerical results reveal a number of valuable insights, e.g., it is always mutually beneficial to cooperate in delivering the primary packets in terms of expanding t...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On the stable throughput of cooperative cognitive radio networks with finite relaying buffer

2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Towards optimal power control for delay-constrained cognitive radio networks

2015 International Conference on Computing, Networking and Communications (ICNC), 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Interference-based optimal power-efficient access scheme for cognitive radio networks

2015 International Conference on Computing, Networking and Communications (ICNC), 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Power management for throughput enhancement in wireless ad-hoc networks

2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Jitter recovery strategies for multimedia traffic in ATM networks

Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference, 1996

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Proactive scheduling for content pre-fetching in mobile networks

2014 IEEE International Conference on Communications (ICC), 2014

ABSTRACT The global adoption of smart phones has raised major concerns about a potential surge in... more ABSTRACT The global adoption of smart phones has raised major concerns about a potential surge in the wireless traffic due to the excessive demand on multimedia services. This ever increasing demand is projected to cause significant congestions and degrade the quality of service for network users. In this paper, we develop a proactive caching framework that utilizes the predictability of the mobile user behavior to offload predictable traffic through the WiFi networks ahead of time. First, we formulate the proactive scheduling problem with the objective of maximizing the user-content hit ratio subject to constrains stemming from the user behavioral models. Second, we propose a quadratic-complexity (in the number of slots per day) greedy, yet, high performance heuristic algorithm that pinpoints the best download slot for each content item to attain maximal hit ratio. We confirm the merits of the proposed scheme based on the traces of a real dataset leveraging a large number of smart phone users who consistently utilized our framework for two months.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of DSRC Channel Fading Analysis from Empirical Measurement

2006 First International Conference on Communications and Networking in China, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improved spectrum mobility using virtual reservation in collaborative cognitive radio networks

2013 IEEE Symposium on Computers and Communications (ISCC), 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fractional sequential sensing for energy efficient cooperative cognitive radio networks

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2014

Bookmarks Related papers MentionsView impact