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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 葉丙成(Ping-Cheng Yeh) | |
dc.contributor.author | Zhung-Han Wu | en |
dc.contributor.author | 吳宗翰 | zh_TW |
dc.date.accessioned | 2021-06-15T04:55:03Z | - |
dc.date.available | 2015-08-02 | |
dc.date.copyright | 2010-08-02 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-07-30 | |
dc.identifier.citation | [1] P. Bucciol, G. Davini, E. Masala, E. Filippi, and J. C. De Martin, “Cross-layer perceptual ARQ for H.264 video streaming over 802.11 wireless networks,” in IEEE Global Telecommunications Conf., vol. 5, 2004, pp. 3027–3031.
[2] S. Khan, Y. Peng, B. Steinbach, M. Sgroi, and W. Kellerer, “Application-driven cross-layer optimization for video streaming over wireless networks,” IEEE Commun. Mag., vol. 44, pp. 122–130, Jan. 2006. [3] P. Ruiz and E. Garcia, “Improving user-perceived QoS in mobile and wireless IP networks using real-time adaptive multimedia applications,” in The 13th IEEE Int. Symp. Personal, Indoor and Moblie Radio Communications, 2002. [4] I. Haratcherev, J. Taal, K. Langendoen, R. Lagendijk, and H. Sips, “Optimized video streaming over 802.11 by cross-layer signaling,” IEEE Commun. Mag., vol. 44, pp. 115–121, Jan. 2006. [5] M. van der Schaar, S. Krishnamachari, S. Choi, and X. Xu, “Adaptive cross-layer protection strategies for robust scalable video transmission over 802.11 WLANs,” IEEE J. Sel. Areas Commun., vol. 21, no. 10, pp. 1752–1763, Dec. 2003. [6] Y. Fallah, D. Koskinen, A. Shahabi, F. Karim, and P. Nasiopoulos, “A cross layer optimization mechanism to improve H.264 video transmission over WLANs,” in IEEE 4th Consumer Communications and Networking Conf., Jan. 2007, pp. 875–879. [7] A. Argyrious, “Distortion-optimized video encoding and streaming in multi-rate wireless LANs,” in IEEE Intl. Conf. Acoustics, Speech and Signal Processing, 2008. [8] C. Sayantan and J. Gibson, “Payload length and rate adaptation for multimedia communications in wireless LANs,” IEEE J. Sel. Areas Commun., vol. 25, pp. 796–807, May 2007. [9] C. Chiang, Z. Wu, C. Shih, P. Yeh, and H. Hsieh, “MAC FER-based codec adaptation for multimedia streaming over wireless networks,” in IEEE Intl. Symp. a World of Wireless Mobile and Multimedia Networks, 2009. [10] R. K. Guha and S. Sarkar, “Characterizing temporal SNR variation in 802.11 networks,” in IEEE Wireless Communication and Networking Conf., vol. 3, 2006, pp. 1408–1413. [11] J. Ar’auz and P. Krishnamurthy, “Markov modeling of 802.11 channels,” in IEEE 58th Vehicular Technology Conf., vol. 2, 2003, pp. 771–775. [12] International Telecommunication Union Std. [Online]. Available: http://www.itu.int/en/pages/default.aspx [13] International Organization for Standardization Std. [Online]. Available: http://www.iso.org/iso/home.html [14] T. Weigand, G. J. Sullivan, G. Byontegaard, and A. Luthra, “Overview of the H.264/AVC video coding standard,” IEEE Trans. Circuits and Systems for Video Technology, vol. 13, pp. 560–576, 2003. [15] J. Ostermann, J. Bormans, P. List, D. Marpe, M. Narroschke, F. Pereira, T. Stockhammer, and T. Wedi, “Video coding with H.264/AVC: Tools, performance, and complexity,” IEEE Circuits and Systems Mag., vol. 4, pp. 7–28, 2004. [16] KTA reference software, Fraunhofer Heinrich Hertz Institute Std. [On-line]. Available: http://iphome.hhi.de/suehring/tml/download/KTA/ [17] FFMpeg Open Source Code Software, Std. [Online]. Available: http://www.ffmpeg.org/download.html [18] R. E. Ziemer and R. L. Peterson, Introduction to Digital Communication, 2nd ed. Prentice Hall, 2005. [19] Q. Zhang and S. A. Kassam, “Finite-state Markov model for Rayleigh fading channels,” IEEE Trans. Commun., vol. 47, pp. 1688–1692, 1999. [20] R. W. Eglese, “Simulated annealing: A tool for operational research,” European Journal of Operational Research, vol. 46, pp. 271–281, 1990. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46133 | - |
dc.description.abstract | 在網路多媒體串流環境中,多媒體串流的影像品質會受到網路通道的影響。由於無線網路通道環境隨著時間變化劇烈,並且難以預測,此會嚴重影響到無線網路中多媒體串流的影像品質。因此經由無線網路提供多媒體串流,並具可靠性且穩定的服務品質,是一件困難的挑戰。本論文對於無線網路多媒體串流提出一個創新的跨層演算法,動態調適伺服器編碼器參數,以適應短期和長期的通道變化。在短期的動態調適方面,本演算法將定時把多媒體客戶端所觀察到的圖框錯誤率(Frame Error Rate)回傳給遠端的多媒體伺服器。伺服器將圖框錯誤率和編碼器切換閾值做比較後,伺服器即可調整編碼器參數以適應於當時的通道環境。本論文也提出演算法對長期的通道變化做出調適。在無線通道狀況和編碼器參數已知的情況下,多媒體伺服器可找出最小化調適周期內均方誤差的編碼器調適閾值,並將此閾值做為短期動態調適演算法中編碼器切換所使用之閾值。本論文所提出的演算法複雜度不高,而且在無線通道下的多媒體串流的信噪比,可以大幅提升3到5分貝。 | zh_TW |
dc.description.abstract | In wireless multimedia streaming, the quality of service (QoS) experienced by the multimedia traffic is subject to the channel variation, which is hard to predict. As a result, transmitting multimedia contents reliably in wireless environments becomes a big challenge in wireless communication. In this thesis, a novel cross-layer algorithm is proposed to deal with both the short-term and the long-term channel variations. To cope with the short-term channel variation, the MAC frame error rate (FER) observed by the client is periodically reported to the multimedia server. The multimedia server then adjusts the codec setting for encoding video bit streams by comparing the reported FER to a set of codec switching thresholds. On the other hand, the algorithm adapts the codec switching thresholds periodically with a longer threshold adaptation period to address the effect of the long-term channel variation. Given the wireless channel state and the codec setting used at the beginning of each threshold adaptation period, the media server selects the codec switching thresholds that minimize the expected transient mean square error (MSE) of the threshold adaptation period. The proposed algorithm reduces the number of computation and the simulation results show that the algorithm significantly improves the PSNR by 3 to 5 dB for multimedia streaming over varying wireless channels. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T04:55:03Z (GMT). No. of bitstreams: 1 ntu-99-R97942031-1.pdf: 6500310 bytes, checksum: b26208954ee6189d57b97f2a25716132 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | Contents
1 Introduction 1 2 Background 7 2.1 Video Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1.1 H.264 . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1.2 Setting in the Simulation . . . . . . . . . . . . . . . . . 9 2.1.3 Objective Video Performance Evaluation . . . . . . . . 12 2.2 IEEE 802.11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3 System Model 15 3.1 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 Channel Model . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3 FER Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4 Cross-Layer Codec Adaptation 21 4.1 Adaptive Codec Switching . . . . . . . . . . . . . . . . . . . . 21 4.2 Switching Threshold Adaptation . . . . . . . . . . . . . . . . . 23 5 Transient MSE Analysis 27 5.1 Induced Markov Chain . . . . . . . . . . . . . . . . . . . . . . 28 i5.2 Expected MSE . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6 Optimal Switching Thresholds Algorithm 35 7 Numerical Results 41 7.1 Simulation Setup and Optimal Switching Thresholds . . . . . 41 7.2 Performance Evaluation . . . . . . . . . . . . . . . . . . . . . 42 8 Conclusions and Future Work 49 A Derivation of {F^w_{i,k}(l)} 51 | |
dc.language.iso | zh-TW | |
dc.title | 無線區域網路多媒體串流下編碼器切換和編碼器切換閾值動態調適 | zh_TW |
dc.title | Codec Switching with Threshold Adaptation for Multimedia Streaming over Wireless Local Area Networks | en |
dc.type | Thesis | |
dc.date.schoolyear | 98-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蔡志宏(Zsehong Tsai),謝宏昀(Hung-Yun Hsieh),魏宏宇(Hung-Yu Wei) | |
dc.subject.keyword | 多媒體,串流,編碼器調適,編碼器切換,圖框錯誤率,無線網路, | zh_TW |
dc.subject.keyword | multimedia,streaming,codec adaptation,codec switching,MAC FER,wireless networks, | en |
dc.relation.page | 57 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2010-07-30 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
顯示於系所單位: | 電信工程學研究所 |
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