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    政大機構典藏 > 理學院 > 資訊科學系 > 會議論文 >  Item 140.119/39838
    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/39838

    Title: Adaptive retransmission to improve MPEG-4 video streaming quality in WiMAX
    Authors: 張宏慶
    Jang, Hung-Chin
    Contributors: International Society for Research in Science and Technology
    Jumper Consulting Investment Ltd.
    Keywords: WiMAX
    Date: 2009-07
    Issue Date: 2010-05-27 16:51:30 (UTC+8)
    Abstract: In this paper we provide better quality of MPEG-4 video streaming under the superior IEEE 802.16 wireless network. There are three types of frames used in video compression: I-frame, P-frame and B-frame. Different types of frames have different significances on video quality. In this paper we propose an adaptive retransmission mechanism to improve MPEG-4 video streaming quality based on both deadline and decoding importance of each frame. We first construct a GOP (Group Of Pictures) tree from a GOP structure. Then we assign different weights to I/P/B-frames to form a GOP weight tree. Next, we classify those frames into "backbone frames" and "non-backbone frames". The backbone frames are allowed to have more retransmissions than those of non-backbone frames. As a further enhancement, we apply Lagrange multiplier method to non-backbone frames to maximize the number of decoding frames. Simulation results show that the proposed method outperforms IEEE 802.16 Standard and Priority Queue in average throughput, average lost & invalid frame and PSNR.
    Relation: International Conference on High Performance Computing, Networking and Communication Systems 2009, HPCNCS 2009, Pages 114-119
    2009 International Conference on High Performance Computing, Networking and Communication Systems, HPCNCS 2009; Orlando, FL; United States; 13 July 2009 到 16 July 2009; 代碼 96746
    Data Type: conference
    Appears in Collections:[資訊科學系] 會議論文

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