電力線頻寬預測與視訊串流

最新的電力線通訊科技可應用於數位家庭中的高畫質視訊串流。然而，透過電力線傳輸的視訊對於電力線環境的干擾十分敏感。這些干擾(例如來自電器用品)可能造成封包遺失或甚至降低通道頻寬。在這樣的環境下傳輸，通道頻寬的資訊對於視訊串流非常重要。然而，已知的頻寬預測方法是針對網際網路與無線網路而設計，由於電力線網路的媒介使用控制(Media Access Control)以及通道干擾的特性不同，使已知的頻寬預測方法不適用於此。在本論文中，我們首先探討室內電力線網路的特性，並提出了一套新的頻寬預測架構。接下來，我們整合了此頻寬預測方法與兩種視訊串流技術來加強服務品質(QoS)，這兩種技術分別是用多重描述壓縮(MDC)以及可調式視訊壓縮(SVC)為基礎發展而來。實驗結果顯示我們提出的頻寬預測技術可以準確的估計頻寬，而提出的兩種視訊串流技術也能提供電力線網路上強健的視訊串流。

關鍵字

電力線；頻寬預測；視訊串流

並列摘要

The up-to-date power line communication (PLC) technologies enable high-quality video streaming in digital homes. However, video streaming over power lines is sensitive to interference in the power line environment. The interference caused by electrical appliances, for example, may cause packet losses and even reduce channel bandwidth. To cope with the hostile environment, information of channel bandwidth is critical to robust video streaming. However, existing bandwidth estimation (BWE) methods developed for the Internet or wireless networks are inadequate for power line networks due to the difference in media access control scheduling policies and channel noise characteristics. In this thesis, we first investigate the characteristics of in-home power line networks and present a new BWE scheme for PLC. Second, we integrate the BWE scheme with two types of video streaming techniques, multiple-description coding (MDC) based and scalable video coding (SVC) based, to enhance the quality of service (QoS). Experimental results show that the proposed BWE scheme achieves good estimation accuracy, and that the MDC-based and SVC-based video streaming techniques provide robust video streaming over the power line network.

並列關鍵字

power line ； bandwidth estimation ； video streaming

參考文獻

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[7] M. Gotz, M. Rapp, and K. Dostert, “Power Line Channel Characteristics and Their Effect on Communication System Design,” IEEE Communication Magazine, Vol. 42, No. 4, pp. 78–86, Apr. 2004.

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[9] J. G. Apostolopoulos, “Error-Resilient Video Compression Through the Use of Multiple States,” Int’l Conf. Image Processing, Vol. 3, pp. 352–355, Sep. 2000.

國際替代計量

電力線頻寬預測與視訊串流

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