The Experts below are selected from a list of 31692 Experts worldwide ranked by ideXlab platform
Seokhwan Park - One of the best experts on this subject based on the ideXlab platform.
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an efficient rate splitting Multiple Access Scheme for the downlink of c ran systems
IEEE Wireless Communications Letters, 2019Co-Authors: Junbeom Kim, Seokhwan ParkAbstract:This letter studies the optimization of rate-splitting Multiple Access (RSMA) transmission technique for a cloud radio Access network (C-RAN) downlink system. Main idea of RSMA is to split the message for each user equipment (UE) to private and common messages and perform superposition coding at transmitters so as to enable flexible decoding at receivers. It is challenging to implement ideal RSMA Scheme particularly when there are many UEs, since the number of common signals exponentially increases with the number of UEs. An efficient RSMA Scheme is hence proposed that uses a linearly increasing number of common signals whose decoding UEs are selected using hierarchical clustering. Via numerical results, we show the performance gains of the proposed RSMA Scheme over conventional space-division Multiple Access (SDMA) and non-orthogonal Multiple Access (NOMA) Schemes as well as over a conventional RSMA Scheme that uses a single common signal.
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an efficient rate splitting Multiple Access Scheme for the downlink of c ran systems
arXiv: Signal Processing, 2019Co-Authors: Junbeom Kim, Seokhwan ParkAbstract:This work studies the optimization of rate-splitting Multiple Access (RSMA) transmission technique for a cloud radio Access network (C-RAN) downlink system. Main idea of RSMA is to split the message for each user equipment (UE) to private and common messages and perform superposition coding at transmitters so as to enable flexible decoding at receivers. It is challenging to implement ideal RSMA Scheme particularly when there are many UEs, since the number of common signals exponentially increases with the number of UEs. An efficient RSMA Scheme is hence proposed that uses a linearly increasing number of common signals whose decoding UEs are selected using hierarchical clustering. Via numerical results, we show the performance gains of the proposed RSMA Scheme over conventional space-division Multiple Access (SDMA) and nonorthogonal Multiple Access (NOMA) Schemes as well as over a conventional RSMA Scheme that uses a single common signal.
Junbeom Kim - One of the best experts on this subject based on the ideXlab platform.
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an efficient rate splitting Multiple Access Scheme for the downlink of c ran systems
IEEE Wireless Communications Letters, 2019Co-Authors: Junbeom Kim, Seokhwan ParkAbstract:This letter studies the optimization of rate-splitting Multiple Access (RSMA) transmission technique for a cloud radio Access network (C-RAN) downlink system. Main idea of RSMA is to split the message for each user equipment (UE) to private and common messages and perform superposition coding at transmitters so as to enable flexible decoding at receivers. It is challenging to implement ideal RSMA Scheme particularly when there are many UEs, since the number of common signals exponentially increases with the number of UEs. An efficient RSMA Scheme is hence proposed that uses a linearly increasing number of common signals whose decoding UEs are selected using hierarchical clustering. Via numerical results, we show the performance gains of the proposed RSMA Scheme over conventional space-division Multiple Access (SDMA) and non-orthogonal Multiple Access (NOMA) Schemes as well as over a conventional RSMA Scheme that uses a single common signal.
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an efficient rate splitting Multiple Access Scheme for the downlink of c ran systems
arXiv: Signal Processing, 2019Co-Authors: Junbeom Kim, Seokhwan ParkAbstract:This work studies the optimization of rate-splitting Multiple Access (RSMA) transmission technique for a cloud radio Access network (C-RAN) downlink system. Main idea of RSMA is to split the message for each user equipment (UE) to private and common messages and perform superposition coding at transmitters so as to enable flexible decoding at receivers. It is challenging to implement ideal RSMA Scheme particularly when there are many UEs, since the number of common signals exponentially increases with the number of UEs. An efficient RSMA Scheme is hence proposed that uses a linearly increasing number of common signals whose decoding UEs are selected using hierarchical clustering. Via numerical results, we show the performance gains of the proposed RSMA Scheme over conventional space-division Multiple Access (SDMA) and nonorthogonal Multiple Access (NOMA) Schemes as well as over a conventional RSMA Scheme that uses a single common signal.
Victor C. M. Leung - One of the best experts on this subject based on the ideXlab platform.
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a novel Multiple Access Scheme over multi packet reception channels for wireless multimedia networks
IEEE Transactions on Wireless Communications, 2007Co-Authors: Hui Chen, Henry C B Chan, Victor C. M. LeungAbstract:Recent advances in signal processing techniques have enabled wireless networks to have multi-packet reception (MPR) capability at the physical layer, where it is possible to receive more than one packets when concurrent transmissions occur. In this paper, we propose a novel multi-reservation Multiple Access (MRMA) Scheme for future wireless multimedia networks based on such an MPR channel model. MRMA can fully exploit the channel's MPR capacity while fulfilling the quality of service requirements of different multimedia traffic. Similar to many existing reservation protocols, MRMA guarantees (i) bounded Access delay for real-time traffic by dropping packets not transmitted within the required delay bound, and (ii) satisfaction of the required packet loss ratio when applied in conjunction with a connection admission control method to limit the number of admitted traffic streams. MRMA further incorporates a priority control mechanism to differentiate guaranteed and best-effort services for real-time voice/video and connectionless data, respectively. Analytical and simulation results are presented to illustrate the effectiveness of MRMA in service differentiation and increasing the number of admitted traffic streams
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a novel Multiple Access Scheme in wireless multimedia networks with multi packet reception
Wireless Multimedia Networking and Performance Modeling, 2005Co-Authors: Hui Chen, Henry C B Chan, Victor C. M. LeungAbstract:Recent advances in signal processing techniques have enabled wireless networks to have multi-packet reception (MPR) capability at the physical layer, where it is possible to receive one or more packets when concurrent transmissions occur. In this paper, we propose the novel multi-reservation Multiple Access (MRMA) Scheme for future wireless multimedia networks based on such an MPR channel model, which fully exploit the channel's MPR capacity while fulfilling the quality of service (QoS) requirements of different multimedia traffic. MRMA employs a centralized reservation mechanism to control the number of simultaneous packets transmitted in each time slot to satisfy a traffic class' packet loss ratio requirement. Moreover, MRMA incorporates an efficient adaptive random Access method and a priority control mechanism to provide guaranteed and best-effort services for real time voice/video traffic and connectionless data traffic, respectively. Simulation and analytical results are presented to illustrate the effectiveness of the proposed Scheme.
Apostolos Traganitis - One of the best experts on this subject based on the ideXlab platform.
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Stability and performance issues of a relay assisted Multiple Access Scheme with MPR capabilities
Computer Communications, 2014Co-Authors: Nikolaos Pappas, Anthony Ephremides, Apostolos TraganitisAbstract:In this work, we study the impact of a relay node to a network with a finite number of users-sources and a destination node. We assume that the users have saturated queues and the relay node does not have packets of its own; we have random Access of the medium and the time is slotted. The relay node stores a source packet that it receives successfully in its queue when the transmission to the destination node has failed. The relay and the destination nodes have multi-packet reception capabilities. We obtain analytical equations for the characteristics of the relay's queue such as average queue length, stability conditions etc. We also study the throughput per user and the aggregate throughput for the network.
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On the stability region of a relay-assisted Multiple Access Scheme
2013 IEEE Information Theory Workshop (ITW), 2013Co-Authors: Nikolaos Pappas, Anthony Ephremides, Marios Kountouris, Apostolos TraganitisAbstract:In this paper we study the impact of a relay node in a two-user network. We assume a random Access collision channel model with erasures. In particular we obtain an inner and an outer bound for the stability region.
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stability and performance issues of a relay assisted Multiple Access Scheme
Global Communications Conference, 2010Co-Authors: Nikolaos Pappas, Apostolos Traganitis, Anthony EphremidesAbstract:In this paper, we examine the operation of a node relaying packets from a number of users to a destination node. We assume that the relay does not have packets of its own, the traffic from the users is saturated and we have random Access of the medium with slotted time. We study the impact of the relay node on the throughput per user and the aggregate throughput for the group of users. We obtain analytical expressions for the arrival and service rate of the queue of the relay, the stability conditions and the average length of the queue. We quantify the above, analytically and through simulations, for different numbers of users and different transmission characteristics of the users and the relay and give the conditions under which there are significant advantages from the deployment of the relay.
Hui Chen - One of the best experts on this subject based on the ideXlab platform.
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a novel Multiple Access Scheme over multi packet reception channels for wireless multimedia networks
IEEE Transactions on Wireless Communications, 2007Co-Authors: Hui Chen, Henry C B Chan, Victor C. M. LeungAbstract:Recent advances in signal processing techniques have enabled wireless networks to have multi-packet reception (MPR) capability at the physical layer, where it is possible to receive more than one packets when concurrent transmissions occur. In this paper, we propose a novel multi-reservation Multiple Access (MRMA) Scheme for future wireless multimedia networks based on such an MPR channel model. MRMA can fully exploit the channel's MPR capacity while fulfilling the quality of service requirements of different multimedia traffic. Similar to many existing reservation protocols, MRMA guarantees (i) bounded Access delay for real-time traffic by dropping packets not transmitted within the required delay bound, and (ii) satisfaction of the required packet loss ratio when applied in conjunction with a connection admission control method to limit the number of admitted traffic streams. MRMA further incorporates a priority control mechanism to differentiate guaranteed and best-effort services for real-time voice/video and connectionless data, respectively. Analytical and simulation results are presented to illustrate the effectiveness of MRMA in service differentiation and increasing the number of admitted traffic streams
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a novel Multiple Access Scheme in wireless multimedia networks with multi packet reception
Wireless Multimedia Networking and Performance Modeling, 2005Co-Authors: Hui Chen, Henry C B Chan, Victor C. M. LeungAbstract:Recent advances in signal processing techniques have enabled wireless networks to have multi-packet reception (MPR) capability at the physical layer, where it is possible to receive one or more packets when concurrent transmissions occur. In this paper, we propose the novel multi-reservation Multiple Access (MRMA) Scheme for future wireless multimedia networks based on such an MPR channel model, which fully exploit the channel's MPR capacity while fulfilling the quality of service (QoS) requirements of different multimedia traffic. MRMA employs a centralized reservation mechanism to control the number of simultaneous packets transmitted in each time slot to satisfy a traffic class' packet loss ratio requirement. Moreover, MRMA incorporates an efficient adaptive random Access method and a priority control mechanism to provide guaranteed and best-effort services for real time voice/video traffic and connectionless data traffic, respectively. Simulation and analytical results are presented to illustrate the effectiveness of the proposed Scheme.