The Experts below are selected from a list of 12924 Experts worldwide ranked by ideXlab platform
Shengli Zhang - One of the best experts on this subject based on the ideXlab platform.
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physical layer network Coding tutorial survey and beyond
Physical Communication, 2013Co-Authors: Soung Chang Liew, Shengli ZhangAbstract:Abstract The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide implications. The basic idea of PNC is to exploit the mixing of signals that occurs naturally when electromagnetic (EM) waves are superimposed on one another. In particular, at a receiver, the simultaneous transmissions by several transmitters result in the reception of a weighted sum of the signals. This weighted sum is a form of network Coding Operation by itself. Alternatively, the received signal could be transformed and mapped to other forms of network Coding. Exploiting these facts turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of (1) wireless communication, (2) information theory, and (3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
Physical Communication, 2013Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:Abstract The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide implications. The basic idea of PNC is to exploit the mixing of signals that occurs naturally when electromagnetic (EM) waves are superimposed on one another. In particular, at a receiver, the simultaneous transmissions by several transmitters result in the reception of a weighted sum of the signals. This weighted sum is a form of network Coding Operation by itself. Alternatively, the received signal could be transformed and mapped to other forms of network Coding. Exploiting these facts turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of (1) wireless communication, (2) information theory, and (3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
arXiv: Networking and Internet Architecture, 2011Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide followings. The basic idea of PNC is to exploit the network Coding Operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
arXiv: Networking and Internet Architecture, 2011Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide followings. The basic idea of PNC is to exploit the network Coding Operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding
arXiv: Information Theory, 2007Co-Authors: Shengli Zhang, Soung Chang LiewAbstract:A main distinguishing feature of a wireless network compared with a wired network is its broadcast nature, in which the signal transmitted by a node may reach several other nodes, and a node may receive signals from several other nodes simultaneously. Rather than a blessing, this feature is treated more as an interference-inducing nuisance in most wireless networks today (e.g., IEEE 802.11). The goal of this paper is to show how the concept of network Coding can be applied at the physical layer to turn the broadcast property into a capacityboosting advantage in wireless ad hoc networks. Specifically, we propose a physical-layer network Coding (PNC) scheme to coordinate transmissions among nodes. In contrast to “straightforward” network Coding which performs Coding arithmetic on digital bit streams after they have been received, PNC makes use of the additive nature of simultaneously arriving electromagnetic (EM) waves for equivalent Coding Operation. PNC can yield higher capacity than straightforward network Coding when applied to wireless networks. We believe this is a first paper that ventures into EM-wavebased network Coding at the physical layer and demonstrates its potential for boosting network capacity. PNC opens up a whole new research area because of its implications and new design requirements for the physical, MAC, and network layers of ad hoc wireless stations. The resolution of the many outstanding but interesting issues in PNC may lead to a revolutionary new paradigm for wireless ad hoc networking.
Soung Chang Liew - One of the best experts on this subject based on the ideXlab platform.
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physical layer network Coding tutorial survey and beyond
Physical Communication, 2013Co-Authors: Soung Chang Liew, Shengli ZhangAbstract:Abstract The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide implications. The basic idea of PNC is to exploit the mixing of signals that occurs naturally when electromagnetic (EM) waves are superimposed on one another. In particular, at a receiver, the simultaneous transmissions by several transmitters result in the reception of a weighted sum of the signals. This weighted sum is a form of network Coding Operation by itself. Alternatively, the received signal could be transformed and mapped to other forms of network Coding. Exploiting these facts turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of (1) wireless communication, (2) information theory, and (3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
Physical Communication, 2013Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:Abstract The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide implications. The basic idea of PNC is to exploit the mixing of signals that occurs naturally when electromagnetic (EM) waves are superimposed on one another. In particular, at a receiver, the simultaneous transmissions by several transmitters result in the reception of a weighted sum of the signals. This weighted sum is a form of network Coding Operation by itself. Alternatively, the received signal could be transformed and mapped to other forms of network Coding. Exploiting these facts turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of (1) wireless communication, (2) information theory, and (3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
arXiv: Networking and Internet Architecture, 2011Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide followings. The basic idea of PNC is to exploit the network Coding Operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
arXiv: Networking and Internet Architecture, 2011Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide followings. The basic idea of PNC is to exploit the network Coding Operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding
arXiv: Information Theory, 2007Co-Authors: Shengli Zhang, Soung Chang LiewAbstract:A main distinguishing feature of a wireless network compared with a wired network is its broadcast nature, in which the signal transmitted by a node may reach several other nodes, and a node may receive signals from several other nodes simultaneously. Rather than a blessing, this feature is treated more as an interference-inducing nuisance in most wireless networks today (e.g., IEEE 802.11). The goal of this paper is to show how the concept of network Coding can be applied at the physical layer to turn the broadcast property into a capacityboosting advantage in wireless ad hoc networks. Specifically, we propose a physical-layer network Coding (PNC) scheme to coordinate transmissions among nodes. In contrast to “straightforward” network Coding which performs Coding arithmetic on digital bit streams after they have been received, PNC makes use of the additive nature of simultaneously arriving electromagnetic (EM) waves for equivalent Coding Operation. PNC can yield higher capacity than straightforward network Coding when applied to wireless networks. We believe this is a first paper that ventures into EM-wavebased network Coding at the physical layer and demonstrates its potential for boosting network capacity. PNC opens up a whole new research area because of its implications and new design requirements for the physical, MAC, and network layers of ad hoc wireless stations. The resolution of the many outstanding but interesting issues in PNC may lead to a revolutionary new paradigm for wireless ad hoc networking.
Lu Lu - One of the best experts on this subject based on the ideXlab platform.
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physical layer network Coding tutorial survey and beyond
Physical Communication, 2013Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:Abstract The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide implications. The basic idea of PNC is to exploit the mixing of signals that occurs naturally when electromagnetic (EM) waves are superimposed on one another. In particular, at a receiver, the simultaneous transmissions by several transmitters result in the reception of a weighted sum of the signals. This weighted sum is a form of network Coding Operation by itself. Alternatively, the received signal could be transformed and mapped to other forms of network Coding. Exploiting these facts turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of (1) wireless communication, (2) information theory, and (3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
arXiv: Networking and Internet Architecture, 2011Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide followings. The basic idea of PNC is to exploit the network Coding Operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
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physical layer network Coding tutorial survey and beyond
arXiv: Networking and Internet Architecture, 2011Co-Authors: Soung Chang Liew, Shengli Zhang, Lu LuAbstract:The concept of physical-layer network Coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network Coding with wide followings. The basic idea of PNC is to exploit the network Coding Operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.
Patrick P Lam - One of the best experts on this subject based on the ideXlab platform.
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hot topic physical layer network Coding
ACM IEEE International Conference on Mobile Computing and Networking, 2006Co-Authors: Shengli Zhang, Soung Chang Liew, Patrick P LamAbstract:A main distinguishing feature of a wireless network compared with a wired network is its broadcast nature, in which the signal transmitted by a node may reach several other nodes, and a node may receive signals from several other nodes simultaneously. Rather than a blessing, this feature is treated more as an interference-inducing nuisance in most wireless networks today (e.g., IEEE 802.11). The goal of this paper is to show how the concept of network Coding can be applied at the physical layer to turn the broadcast property into a capacity-boosting advantage in wireless ad hoc networks. Specifically, we propose a physical-layer network Coding (PNC) scheme to coordinate transmissions among nodes. In contrast to "straightforward" network Coding which performs Coding arithmetic on digital bit streams after they have been received, PNC makes use of the additive nature of simultaneously arriving electromagnetic (EM) waves for equivalent Coding Operation. PNC can yield higher capacity than straight-forward network Coding when applied to wireless networks. We believe this is a first paper that ventures into EM-wave-based network Coding at the physical layer and demonstrates its potential for boosting network capacity. PNC opens up a whole new research area because of its implications and new design requirements for the physical, MAC, and network layers of ad hoc wireless stations. The resolution of the many outstanding but interesting issues in PNC may lead to a revolutionary new paradigm for wireless ad hoc networking.
Susumu Horiguchi - One of the best experts on this subject based on the ideXlab platform.
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joint design of network Coding and transmission rate selection for multihop wireless networks
IEEE Transactions on Vehicular Technology, 2010Co-Authors: Kaikai Chi, Xiaohong Jiang, Susumu HoriguchiAbstract:Network Coding has the potential to greatly improve the throughput of wireless networks. In the current proposals for wireless network Coding, network nodes transmit packets at a fixed transmission rate. It is notable, however, that by dynamically selecting the rate, we can effectively improve the node transmission efficiency. In this paper, we study the application of a rate-adaptive transmission mechanism in network-Coding-based multihop wireless networks. In such networks, whether a Coding solution is satisfactory or not depends not only on the number of involved native packets but on the packet loss probabilities of its intended next hops and its transmission time as well, both of which depend on the transmission rate. Therefore, we aim to jointly design the Coding Operation and rate selection to maximize the transmission efficiency. Specifically, we first describe and mathematically formulate the optimal packet Coding and rate-selection problem. Then, we prove the NP-completeness of this optimization problem. Finally, we propose an efficient algorithm for finding good combinations of the Coding solution and the transmission rate. Simulation results demonstrate that compared with the rate-fixed transmission, the rate-adaptive transmission based on our algorithm can significantly improve the node transmission efficiency.