The Experts below are selected from a list of 55347 Experts worldwide ranked by ideXlab platform

Chengxiang Wang - One of the best experts on this subject based on the ideXlab platform.

  • energy efficiency optimization for mimo ofdm mobile Multimedia Communication systems with qos constraints
    arXiv: Information Theory, 2014
    Co-Authors: Xi Huang, Yuming Wang, Min Chen, Tao Han, Chengxiang Wang
    Abstract:

    It is widely recognized that besides the quality of service (QoS), the energy efficiency is also a key parameter in designing and evaluating mobile Multimedia Communication systems, which has catalyzed great interest in recent literature. In this paper, an energy efficiency model is first proposed for multiple-input multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM) mobile Multimedia Communication systems with statistical QoS constraints. Employing the channel matrix singular-value-decomposition (SVD) method, all subchannels are classified by their channel characteristics. Furthermore, the multi-channel joint optimization problem in conventional MIMO-OFDM Communication systems is transformed into a multi-target single channel optimization problem by grouping all subchannels. Therefore, a closed-form solution of the energy efficiency optimization is derived for MIMO-OFDM mobile mlutimedia Communication systems. As a consequence, an energy-efficiency optimized power allocation (EEOPA) algorithm is proposed to improve the energy efficiency of MIMO-OFDM mobile Multimedia Communication systems. Simulation comparisons validate that the proposed EEOPA algorithm can guarantee the required QoS with high energy efficiency in MIMO-OFDM mobile Multimedia Communication systems.

  • energy efficiency optimization for mimo ofdm mobile Multimedia Communication systems with qos constraints
    IEEE Transactions on Vehicular Technology, 2014
    Co-Authors: Xiaohu Ge, Xi Huang, Yuming Wang, Min Chen, Qiang Li, Tao Han, Chengxiang Wang
    Abstract:

    It is widely recognized that, in addition to the quality-of-service (QoS), energy efficiency is also a key parameter in designing and evaluating mobile Multimedia Communication systems, which has catalyzed great interest in recent literature. In this paper, an energy-efficiency model is first proposed for multiple-input–multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) mobile Multimedia Communication systems with statistical QoS constraints. Employing the channel-matrix singular value decomposition (SVD) method, all subchannels are classified by their channel characteristics. Furthermore, the multichannel joint optimization problem in conventional MIMO-OFDM Communication systems is transformed into a multitarget single-channel optimization problem by grouping all subchannels. Therefore, a closed-form solution of the energy-efficiency optimization is derived for MIMO-OFDM mobile Multimedia Communication systems. As a consequence, an energy-efficiency optimized power allocation (EEOPA) algorithm is proposed to improve the energy efficiency of MIMO-OFDM mobile Multimedia Communication systems. Simulation comparisons validate that the proposed EEOPA algorithm can guarantee the required QoS with high energy efficiency in MIMO-OFDM mobile Multimedia Communication systems.

Lianggee Chen - One of the best experts on this subject based on the ideXlab platform.

  • hardware architecture design of video compression for Multimedia Communication systems
    IEEE Communications Magazine, 2005
    Co-Authors: Shaoyi Chien, Yuwen Huang, Chingyeh Chen, Homer H Chen, Lianggee Chen
    Abstract:

    VLSI realization of video compression is the key to many real-time Multimedia Communications systems. Among the video compression algorithms, the newly established MPEG-4 and, in particular, H.264 standards have become increasingly popular. However, the high coding efficiency of such video coding algorithms comes at the cost of a dramatic increase in complexity. Effective and efficient hardware solutions to this problem are necessary. In this article we present an overview of the hardware design issues of MPEG-4 and H.264. Both module and system architectures of these two coding standards are discussed. Based on these architectures, the design of a single-chip encoder complying with the H.264 baseline profile and capable of encoding the D1 resolution (720 x 480) video at 30 Hz is presented as an example. In addition, the system integration issues of video compression engines with Multimedia Communication systems and a general hardware platform for various applications are discussed.

Ajaz Hussain Mir - One of the best experts on this subject based on the ideXlab platform.

Hamid Sharif - One of the best experts on this subject based on the ideXlab platform.

  • a survey of energy efficient compression and Communication techniques for Multimedia in resource constrained systems
    IEEE Communications Surveys and Tutorials, 2013
    Co-Authors: Michael Hempel, Dongming Peng, Hamid Sharif
    Abstract:

    Advances in wireless Multimedia Communication technologies enable new types of pervasive and ubiquitous applications such as mobile health care, environmental monitoring, facility monitoring and traffic surveillance. Among different factors concerned, energy efficiency is one of the most challenging issues in Multimedia Communication due to the resource constraints, and the requirements for high bandwidth and low transmission delay. In this survey, we provide a broad picture of the state-of-the-art energy efficient techniques that have been proposed in wireless Multimedia Communication for resource-constrained systems such as wireless sensor networks and mobile devices. Following the essential stages required for Multimedia Communication, we categorize these techniques into two groups: Multimedia compression techniques and Multimedia transmission techniques. In the first group, we introduce the state-of-the-art compression algorithms and perform analyses and evaluations on energy efficiency in applying these compression algorithms to resource-constrained Multimedia transmission systems. In the second group, we will further categorize the energy efficient transmission techniques into two sub-categories according to their different Communication architectures. We review both cross-layer Communication, including Unequal Error Protection (UEP), and independent-layer Communication, focusing on Routing, MAC, and Physical layer protocols. We present the basic problem statement and objectives of these techniques, and survey multiple potential approaches that have been reported in the literature. Our focus in this survey is to provide insight into different research directions to improve energy efficiency in wireless Multimedia Communication protocols for future developments.

M Talanda - One of the best experts on this subject based on the ideXlab platform.

  • Multimedia Communication in policy based heterogeneous wireless networks
    Vehicular Technology Conference, 2004
    Co-Authors: Andreas Kassler, A Schorr, L Chen, Christoph Niedermeier, C Meyer, M Helbing, M Talanda
    Abstract:

    We present a system for IP based networks which allows policy based handover between different access network technologies. The policy rules for selection of the access network are provided by the network/service provider. An interface selection subsystem on the mobile terminal triggers the handover according to these policy rules, and a service subsystem initiates adaptation of the media streams to match the network resource availability. We provide performance measurements to analyze the handover behaviour of our system during a running video session. These measurements show that with the proper interworking between interface selection in the mobile terminal and media adaptation in the video server, an almost seamless policy based handover between heterogeneous wireless networks is possible.