The Experts below are selected from a list of 9282 Experts worldwide ranked by ideXlab platform
Kee Chaing Chua - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of variable bit rate multiclass services in the uplink of a dynamic complete group partitioning round robin carrier hopping multirate multi carrier ds cdma system
Vehicular Technology Conference, 2004Co-Authors: T C Wong, Jon W Mark, Kee Chaing ChuaAbstract:An analytical formulation of the outage probability in terms of bit error rate specification for variable bit rate (VBR) multiclass services in the uplink of a dynamic complete group partitioning (DCGP) round-robin carrier-hopping multirate multi-carrier (MC) DS-CDMA cellular system is presented. The analytical framework is formulated for the general case in which different traffic classes have different spreading gains in each of the subcarriers. The analytical work leads to the determination of the capacity region of this system for VBR traffic. Numerical results show that the system capacity with DCGP can be larger than those with complete sharing (CS) and dynamic complete partitioning (DCP) of the subcarriers.
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performance analysis of variable bit rate multiclass services in the downlink of a dynamic complete partitioning round robin carrier hopping multirate multi carrier ds cdma system
Personal Indoor and Mobile Radio Communications, 2004Co-Authors: T C Wong, Jon W Mark, Kee Chaing ChuaAbstract:Analytical formulations of the outage probability in terms of bit error rate specification using Chernoff bound and central limit Gaussian approximation for variable bit rate (VBR) multiclass services in the downlink of a dynamic complete partitioning (DCP) round-robin carrier-hopping multirate multi-carrier (MC) DS-CDMA cellular system is presented. The analytical framework is formulated for the general case in which different traffic classes have different spreading gains in each of the subcarriers. The analytical work leads to the determination of the capacity region of a dynamic complete partitioning round-robin carrier-hopping multirate MC-DS-CDMA system for VBR traffic. Numerical results show that the system capacity with DCP can be larger than that with complete sharing (CS) of the subcarriers.
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EURASIP Journal on Applied Signal Processing 2005:2, 183–192 c ○ 2005 Hindawi Publishing Corporation Cross-Layer Resource Allocation for variable bit rate Multiclass Services in a Multirate
2004Co-Authors: Tung Chong Wong, Jon W Mark, Kee Chaing ChuaAbstract:An approximate analytical formulation of the resource allocation problem for handling variable bit rate multiclass services in a cellular round-robin carrier-hopping multirate multicarrier direct-sequence code-division multiple-access (MC-DS-CDMA) system is presented. In this paper, all grade-of-service (GoS) or quality-of-service (QoS) requirements at the connection level, packet level, and link layer are satisfied simultaneously in the system, instead of being satisfied at the connection level or at the link layer only. The analytical formulation shows how the GoS/QoS in the different layers are intertwined across the layers. A novelty of this paper is that the outages in the subcarriers are minimized by spreading the subcarriers ’ signal-to-interference ratio evenly among all the subcarriers by using a dynamic round-robin carrier-hopping allocation scheme. A complete sharing (CS) scheme with guard capacity is used for the resource sharing policy at the connection level based on the mean rates of the connections. Numerical results illustrate that significant gain in the system utilization is achieved through the joint coupling of connection/packet levels and link layer
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joint connection level packet level and link layer resource allocation for variable bit rate multiclass services in cellular ds cdma networks with qos constraints
IEEE Journal on Selected Areas in Communications, 2003Co-Authors: T C Wong, J W Mark, Kee Chaing ChuaAbstract:An approximate analytical formulation of the resource allocation problem for handling variable bit rate multiclass services in a cellular direct sequence code-division multiple-access (DS-CDMA) system is presented. The novelty in this paper is that all grade-of-service (GoS) or quality-of-service (QoS) requirements at the connection level, packet level, and link layer are satisfied simultaneously, instead of being satisfied at the connection level or at the link layer only. The analytical formulation shows how the GoS/QoS in the different layers are intertwined across the layers. A complete sharing (CS) scheme with guard channels is used for the resource sharing policy at the connection level. The CS model is solved using a K-dimensional Markov chain. Numerical results illustrate that significant gain in system utilization is achieved through the joint coupling of connection/packet levels and link layer. This can translate to more revenues for network providers and/or lower charges for mobile users.
El M Zarki - One of the best experts on this subject based on the ideXlab platform.
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mpeg coding for variable bit rate video transmission
IEEE Communications Magazine, 1994Co-Authors: P Pancha, El M ZarkiAbstract:For real-time transmission of broadcast-quality video on ATM-based B-ISDN, the intraframe to interframe ratio and the quantizer scale are two key parameters that can be used to control a video source in a network environment. Their impact on the traffic characteristics of the coder provides insights into the cell arrival process for an MPEG source. The authors obtain video source models for coders that utilize a standard algorithm that can be applied to a multitude of video services. The output stream of a video coder, which complies with the Motion Pictures Expert Group (MPEG) coding standard, is studied with an National Television Systems Committee (NTSC) quality video sequence as the input. Because the MPEG video coding algorithm has been proposed for a variety of applications, they also investigate the effect of changing the coding parameters on the statistics of interest. >
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bandwidth allocation schemes for variable bit rate mpeg sources in atm networks
IEEE Transactions on Circuits and Systems for Video Technology, 1993Co-Authors: P Pancha, El M ZarkiAbstract:The complex traffic characteristics of variable-bit-rate (VBR) video sources makes them difficult to accommodate in asynchronous-transfer-mode (ATM) networks. To efficiently transport these services will require both an understanding of the source traffic and novel network control schemes. The performance of variable-bandwidth-allocation schemes that estimate the required bandwidth for a VBR Motion Picture Experts Group (MPEG) video source is studied using a simple prediction algorithm. The advantages of using a layered MPEG coder over the standard MPEG coder are discussed. A method for controlling a layered MPEG coder to reduce the effect of cell losses when compared to a standard MPEG coder is demonstrated. >
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prioritized transmission of variable bit rate mpeg video
Global Communications Conference, 1992Co-Authors: P Pancha, El M ZarkiAbstract:The traffic characteristics of an MPEG coder which generates a high-priority and a low-priority bit stream are studied. The prioritization scheme for the coder assigns components of the data stream to each priority level based on the value of a parameter B. Statistics of both high- and low-priority cells for a pure intraframe and a mixed interframe/intraframe coder are presented. In particular, the probability mass functions on a cells per slice basis of the high-priority and low-priority component for various values of B are shown. Statistics gathered from this type of prioritization scheme can be applied in several ways for network design and operation. >
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a look at the mpeg video coding standard for variable bit rate video transmission
International Conference on Computer Communications, 1992Co-Authors: P Pancha, El M ZarkiAbstract:The MPEG video coding standard for the transmission of variable-bit-rate video on asynchronous transfer mode (ATM)-based broadband ISDN is examined. The focus is on its use for real-time transmission of broadcast-quality video. The impact of two key parameters, the intraframe to interframe picture ratio and the quantization index that are defined in the standard, on the bit rates per frame was studied. These parameters can be used to control video sources depending on the state of the network. Also, as opposed to previous work which looks only at bit rates per frame, the bits generated per macroblock are studied. This is the basic MPEG coding unit. By packetizing these bits, insight was obtained into the cell arrival process to a network for a MPEG video source. >
T C Wong - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of variable bit rate multiclass services in the uplink of a dynamic complete group partitioning round robin carrier hopping multirate multi carrier ds cdma system
Vehicular Technology Conference, 2004Co-Authors: T C Wong, Jon W Mark, Kee Chaing ChuaAbstract:An analytical formulation of the outage probability in terms of bit error rate specification for variable bit rate (VBR) multiclass services in the uplink of a dynamic complete group partitioning (DCGP) round-robin carrier-hopping multirate multi-carrier (MC) DS-CDMA cellular system is presented. The analytical framework is formulated for the general case in which different traffic classes have different spreading gains in each of the subcarriers. The analytical work leads to the determination of the capacity region of this system for VBR traffic. Numerical results show that the system capacity with DCGP can be larger than those with complete sharing (CS) and dynamic complete partitioning (DCP) of the subcarriers.
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performance analysis of variable bit rate multiclass services in the downlink of a dynamic complete partitioning round robin carrier hopping multirate multi carrier ds cdma system
Personal Indoor and Mobile Radio Communications, 2004Co-Authors: T C Wong, Jon W Mark, Kee Chaing ChuaAbstract:Analytical formulations of the outage probability in terms of bit error rate specification using Chernoff bound and central limit Gaussian approximation for variable bit rate (VBR) multiclass services in the downlink of a dynamic complete partitioning (DCP) round-robin carrier-hopping multirate multi-carrier (MC) DS-CDMA cellular system is presented. The analytical framework is formulated for the general case in which different traffic classes have different spreading gains in each of the subcarriers. The analytical work leads to the determination of the capacity region of a dynamic complete partitioning round-robin carrier-hopping multirate MC-DS-CDMA system for VBR traffic. Numerical results show that the system capacity with DCP can be larger than that with complete sharing (CS) of the subcarriers.
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joint connection level packet level and link layer resource allocation for variable bit rate multiclass services in cellular ds cdma networks with qos constraints
IEEE Journal on Selected Areas in Communications, 2003Co-Authors: T C Wong, J W Mark, Kee Chaing ChuaAbstract:An approximate analytical formulation of the resource allocation problem for handling variable bit rate multiclass services in a cellular direct sequence code-division multiple-access (DS-CDMA) system is presented. The novelty in this paper is that all grade-of-service (GoS) or quality-of-service (QoS) requirements at the connection level, packet level, and link layer are satisfied simultaneously, instead of being satisfied at the connection level or at the link layer only. The analytical formulation shows how the GoS/QoS in the different layers are intertwined across the layers. A complete sharing (CS) scheme with guard channels is used for the resource sharing policy at the connection level. The CS model is solved using a K-dimensional Markov chain. Numerical results illustrate that significant gain in system utilization is achieved through the joint coupling of connection/packet levels and link layer. This can translate to more revenues for network providers and/or lower charges for mobile users.
P Pancha - One of the best experts on this subject based on the ideXlab platform.
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mpeg coding for variable bit rate video transmission
IEEE Communications Magazine, 1994Co-Authors: P Pancha, El M ZarkiAbstract:For real-time transmission of broadcast-quality video on ATM-based B-ISDN, the intraframe to interframe ratio and the quantizer scale are two key parameters that can be used to control a video source in a network environment. Their impact on the traffic characteristics of the coder provides insights into the cell arrival process for an MPEG source. The authors obtain video source models for coders that utilize a standard algorithm that can be applied to a multitude of video services. The output stream of a video coder, which complies with the Motion Pictures Expert Group (MPEG) coding standard, is studied with an National Television Systems Committee (NTSC) quality video sequence as the input. Because the MPEG video coding algorithm has been proposed for a variety of applications, they also investigate the effect of changing the coding parameters on the statistics of interest. >
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bandwidth allocation schemes for variable bit rate mpeg sources in atm networks
IEEE Transactions on Circuits and Systems for Video Technology, 1993Co-Authors: P Pancha, El M ZarkiAbstract:The complex traffic characteristics of variable-bit-rate (VBR) video sources makes them difficult to accommodate in asynchronous-transfer-mode (ATM) networks. To efficiently transport these services will require both an understanding of the source traffic and novel network control schemes. The performance of variable-bandwidth-allocation schemes that estimate the required bandwidth for a VBR Motion Picture Experts Group (MPEG) video source is studied using a simple prediction algorithm. The advantages of using a layered MPEG coder over the standard MPEG coder are discussed. A method for controlling a layered MPEG coder to reduce the effect of cell losses when compared to a standard MPEG coder is demonstrated. >
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prioritized transmission of variable bit rate mpeg video
Global Communications Conference, 1992Co-Authors: P Pancha, El M ZarkiAbstract:The traffic characteristics of an MPEG coder which generates a high-priority and a low-priority bit stream are studied. The prioritization scheme for the coder assigns components of the data stream to each priority level based on the value of a parameter B. Statistics of both high- and low-priority cells for a pure intraframe and a mixed interframe/intraframe coder are presented. In particular, the probability mass functions on a cells per slice basis of the high-priority and low-priority component for various values of B are shown. Statistics gathered from this type of prioritization scheme can be applied in several ways for network design and operation. >
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a look at the mpeg video coding standard for variable bit rate video transmission
International Conference on Computer Communications, 1992Co-Authors: P Pancha, El M ZarkiAbstract:The MPEG video coding standard for the transmission of variable-bit-rate video on asynchronous transfer mode (ATM)-based broadband ISDN is examined. The focus is on its use for real-time transmission of broadcast-quality video. The impact of two key parameters, the intraframe to interframe picture ratio and the quantization index that are defined in the standard, on the bit rates per frame was studied. These parameters can be used to control video sources depending on the state of the network. Also, as opposed to previous work which looks only at bit rates per frame, the bits generated per macroblock are studied. This is the basic MPEG coding unit. By packetizing these bits, insight was obtained into the cell arrival process to a network for a MPEG video source. >
Vikram Krishnamurthy - One of the best experts on this subject based on the ideXlab platform.
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cross layer optimal connection admission control for variable bit rate multimedia traffic in packet wireless cdma networks
IEEE Transactions on Signal Processing, 2006Co-Authors: Vikram Krishnamurthy, Victor C M LeungAbstract:Next generation wireless code division multiple access (CDMA) networks are required to support packet multimedia traffic. This paper addresses the connection admission control problem for multiservice packet traffic modeled as Markov modulated Poisson process (MMPP) with the quality of service (QoS) requirements on both physical layer signal-to-interference ratio (SIR) and network layer blocking probability. Optimal linear-programming-based algorithms are presented that take into account of SIR outage probability constraints. By exploiting the MMPP traffic models and introducing a small SIR outage probability, the proposed algorithms can dramatically improve the network utilization. In addition, we propose two reduced complexity algorithms that require less computation and can have satisfactory approximation to the optimal solutions. Numerical examples illustrating the performance of the proposed schemes are presented.
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Effective bandwidth of multimedia traffic in packet wireless CDMA networks with LMMSE receivers: a cross-layer perspective
IEEE Transactions on Wireless Communications, 2006Co-Authors: Vikram KrishnamurthyAbstract:We propose a novel concept of cross-layer effective bandwidth that characterizes the unified resource usage taking into account both physical layer linear minimum mean square error (LMMSE) receivers and statistical characteristics of the packet traffic in code division multiple access (CDMA) networks. Based on the concept of cross-layer effective bandwidth, we develop an optimal connection admission control (CAC) scheme for variable bit rate packet traffic with QoS constraints at both physical and network layers. By introducing a small signal-to-interference ratio (SIR) outage probability using the concept of cross-layer effective bandwidth, the capacity of CDMA networks in the proposed CAC scheme can be increased significantly compared to some existing schemes. The effectiveness of the proposed approaches is demonstrated by numerical examples.
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cross layer optimal connection admission control for variable bit rate multimedia traffic in packet wireless cdma networks
Global Communications Conference, 2004Co-Authors: Vikram Krishnamurthy, Victor C M LeungAbstract:Next generation wireless code division multiple access (CDMA) networks are required to support packet multimedia traffic. This paper addresses the connection admission control problem for multi-service packet traffic, modeled as a Markov modulated Poisson process (MMPP) with the quality of service (QoS) requirements on both physical layer signal-to-interference (SIR) and network layer blocking probability. Optimal linear-programming-based algorithms are presented that take into account SIR outage probability constraints. By exploiting the MMPP traffic models and introducing a small SIR outage probability, the proposed algorithms can dramatically improve the network utilization. Numerical examples illustrating the performance of the proposed schemes are presented.
