The Experts below are selected from a list of 76866 Experts worldwide ranked by ideXlab platform

Hui Zhang - One of the best experts on this subject based on the ideXlab platform.

  • improving fairness efficiency and stability in http based adaptive video streaming with festive
    IEEE ACM Transactions on Networking, 2014
    Co-Authors: Junchen Jiang, Vyas Sekar, Hui Zhang
    Abstract:

    Modern video players today rely on bit-rate adaptation in order to respond to changing network conditions. Past Measurement studies have identified issues with today's commercial players when multiple bit-rate-adaptive players share a bottleneck link with respect to three metrics: fairness, efficiency, and stability. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bit-rate adaptation and analyze several commercial players through the lens of an abstract player model consisting of three main components: bandwidth estimation, bit-rate selection, and chunk scheduling. Using framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bit-rate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness, and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.

  • improving fairness efficiency and stability in http based adaptive video streaming with festive
    Conference on Emerging Network Experiment and Technology, 2012
    Co-Authors: Junchen Jiang, Vyas Sekar, Hui Zhang
    Abstract:

    Many commercial video players rely on bitrate adaptation logic to adapt the bitrate in response to changing network conditions. Past Measurement studies have identified issues with today's commercial players with respect to three key metrics---efficiency, fairness, and stability---when multiple bitrate-adaptive players share a bottleneck link. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bitrate adaptation and analyze several commercial players through the lens of an abstract player model. Through this framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bitrate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.

Junchen Jiang - One of the best experts on this subject based on the ideXlab platform.

  • improving fairness efficiency and stability in http based adaptive video streaming with festive
    IEEE ACM Transactions on Networking, 2014
    Co-Authors: Junchen Jiang, Vyas Sekar, Hui Zhang
    Abstract:

    Modern video players today rely on bit-rate adaptation in order to respond to changing network conditions. Past Measurement studies have identified issues with today's commercial players when multiple bit-rate-adaptive players share a bottleneck link with respect to three metrics: fairness, efficiency, and stability. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bit-rate adaptation and analyze several commercial players through the lens of an abstract player model consisting of three main components: bandwidth estimation, bit-rate selection, and chunk scheduling. Using framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bit-rate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness, and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.

  • improving fairness efficiency and stability in http based adaptive video streaming with festive
    Conference on Emerging Network Experiment and Technology, 2012
    Co-Authors: Junchen Jiang, Vyas Sekar, Hui Zhang
    Abstract:

    Many commercial video players rely on bitrate adaptation logic to adapt the bitrate in response to changing network conditions. Past Measurement studies have identified issues with today's commercial players with respect to three key metrics---efficiency, fairness, and stability---when multiple bitrate-adaptive players share a bottleneck link. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bitrate adaptation and analyze several commercial players through the lens of an abstract player model. Through this framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bitrate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.

Tokunbo Ogunfunmi - One of the best experts on this subject based on the ideXlab platform.

  • on the convergence behavior of the affine projection algorithm for adaptive filters
    IEEE Transactions on Circuits and Systems, 2011
    Co-Authors: Thomas Paul, Tokunbo Ogunfunmi
    Abstract:

    The affine projection class of algorithms (APA) provides faster convergence than LMS-based adaptive filters. Its convergence analysis is not as extensively studied as Normalized LMS (NLMS), and remains an active area of research. For tractability, most works on APA make many assumptions on the statistics of the input, as well as correlation between signals. Here we consider the effect of the correlation between filter coefficients and Past Measurement noise on MSE error. The effect of this correlation was found to be dependent on step-size mu, increasing or decreasing the predicted MSE depending on whether mu is less than or greater than 1, irrespective of the input statistics. Simulations are used to verify the analysis results presented.

Vyas Sekar - One of the best experts on this subject based on the ideXlab platform.

  • improving fairness efficiency and stability in http based adaptive video streaming with festive
    IEEE ACM Transactions on Networking, 2014
    Co-Authors: Junchen Jiang, Vyas Sekar, Hui Zhang
    Abstract:

    Modern video players today rely on bit-rate adaptation in order to respond to changing network conditions. Past Measurement studies have identified issues with today's commercial players when multiple bit-rate-adaptive players share a bottleneck link with respect to three metrics: fairness, efficiency, and stability. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bit-rate adaptation and analyze several commercial players through the lens of an abstract player model consisting of three main components: bandwidth estimation, bit-rate selection, and chunk scheduling. Using framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bit-rate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness, and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.

  • improving fairness efficiency and stability in http based adaptive video streaming with festive
    Conference on Emerging Network Experiment and Technology, 2012
    Co-Authors: Junchen Jiang, Vyas Sekar, Hui Zhang
    Abstract:

    Many commercial video players rely on bitrate adaptation logic to adapt the bitrate in response to changing network conditions. Past Measurement studies have identified issues with today's commercial players with respect to three key metrics---efficiency, fairness, and stability---when multiple bitrate-adaptive players share a bottleneck link. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bitrate adaptation and analyze several commercial players through the lens of an abstract player model. Through this framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bitrate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.

Yakir Aharonov - One of the best experts on this subject based on the ideXlab platform.

  • can a future choice affect a Past Measurement s outcome
    EPJ Web of Conferences, 2014
    Co-Authors: Yakir Aharonov, Eliahu Cohen, Doron Grossman, A C Elizutr
    Abstract:

    An EPR experiment is studied where each particle undergoes a few weak Measurements along some pre-set spin orientations, whose outcomes are individually recorded. Then the particle undergoes a strong Measurement along a spin orientation freely chosen at the last moment. Bell-inequality violation is expected between the two final strong Measurements within each EPR pair. At the same time, agreement is expected between these Measurements and the earlier weak ones within the pair. A contradiction thereby ensues: i) Bell's theorem forbids spin values to exist prior to the choice of the spin-orientation to be measured; ii) A weak Measurement cannot determine the outcome of a successive strong one; and iii) Indeed no disentanglement is inflicted by the weak Measurements; yet iv) The weak Measurements' outcomes agree with those of the strong ones. The most reasonable resolution seems to be that of the Two-State- Vector Formalism, namely, that the experimenter's choice has been encrypted within the weak Measurement's outcomes, even before the experimenter themselves knows what their choice will be. Causal loops are avoided by this anticipation remaining encrypted until the final outcomes enable to decipher it.

  • can a future choice affect a Past Measurement s outcome
    arXiv: Quantum Physics, 2012
    Co-Authors: Yakir Aharonov, Eliahu Cohen, Avshalom C Elitzur
    Abstract:

    An EPR experiment is studied where each particle within the entangled pair undergoes a few weak Measurements (WMs) along some pre-set spin orientations, with the outcomes individually recorded. Then the particle undergoes one strong Measurement along an orientation chosen at the last moment. Bell-inequality violation is expected between the two final Measurements within each EPR pair. At the same time, statistical agreement is expected between these strong Measurements and the earlier weak ones performed on that pair. A contradiction seemingly ensues: (i) Bell's theorem forbids spin values to exist prior to the choice of the orientation measured; (ii) A weak Measurement is not supposed to determine the outcome of a successive strong one; and indeed (iii) Almost no disentanglement is inflicted by the WMs; and yet (iv) The outcomes of weak Measurements statistically agree with those of the strong ones, suggesting the existence of pre-determined values, in contradiction with (i). Although the conflict can be solved by mere mitigation of the above restrictions, the most reasonable resolution seems to be that of the Two-State-Vector Formalism (TSVF), namely, that the choice of the experimenter has been encrypted within the weak Measurement's outcomes, even before the experimenters themselves know what their choice will be.