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By using 60GHz spectrum in high frequency carrier, IEEE 802.11ad is widely used in the transmission of high-definition videos. In this paper, an adaptive cross-layer optimization scheme is proposed based on IEEE 802.11ad which involves modulation and coding at the physical layer, retransmission policy at the medium access control layer and source coding at the video coding layer. The scheme aims at...
In this paper we propose a distributed video combining method applicable to continuous presence multipoint video conferencing for the H.264 coding standard. The proposed method takes advantage of the significant coding features of the H.264 format and employs star-connected multiple video combiners to perform combining process cooperatively. We investigate the architecture and the required operations...
At present, many application layer multicast protocols (ALM) based on multiple description coding (MDC) have been proved to be more scalable and robust than traditional multicast protocols in practical environment. In this paper, we propose an ALM system called SMD for streaming media based on MDC to address the problem of synchronization of available descriptions among maximum hosts. SMD concentrates...
We put forward a new method for using dynamic keys to encrypt video information on the theory and characteristics of the H.264 video compression standard. The dynamic key encrypts the most important parts of video information, not only to ensure the safety of the information but also to improve the transmission rate. The algorithm is implemented in JM12.4, experimental results show that the new algorithm...
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