| Vol. 2, No. 1, November 2005 - Art. 12 |
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| Wireless Adaptive Video Enhanced Streaming: WAVES |
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by
Gabriella Convertino, Diego Melpignano, Silvio Oliva, Emiliano Piccinelli, Fabrizio Rovati, Francesco Sigona (STMicroelectronics)
Copyright
Copyright © STMicroelectronics, 2005 |
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Abstract
Wireless LANs are appearing in the domestic environment mainly for sharing access to a broadband Internet connection. Consumer electronics manufacturers are interested in using a domestic WLAN to distribute audiovisual content among entertainment devices and PC's. However, the variations of the wireless link conditions in a home environment due to propagation effects, interference, and traffic generated by other devices make the bandwidth available for audio/video streaming a highly variable factor. The approach followed to face WLAN varying conditions consists of adding an adaptive video transcoder to the WLAN access point or station, enabling a dynamic variation in the bit rate of MPEG2 encoded streams and reducing the video spatial and/or temporal resolution, according to input received by a Cross-Layer Controller (CLC) block. This component estimates that the Wireless LAN conditions, calculate the bandwidth available for A/V streaming and consequently drive the MPEG2 video transcoder. A patent for the CLC block was filed on March 26, 2004.
Experimental results demonstrate that the proposed approach allows to obtain a good quality for the reconstructed video in the presence of a noisy channel. |
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