An Adaptive Asymmetric Transmission Scheme for MPEG-4/SVC Signals in MIMO-OFDM System

摘要

We propose an adaptive asymmetric transmission scheme to improve the quality of video and the QoS for MPEG-4/SVC signals in MIMO-OFDM systems. An SVC signal is composed of a base layer and several enhanced layers. These layers have different priority among the layers to ensure the quality of the video. The base layer has an essential role in the SVC signal, because when the base layer is broken due to the channel environment, that SVC signal is not available. A higher number of enhanced layers make it possible to improve the quality of the video, but it is not possible to compose the SVC signal using only the enhanced layers. Therefore, the proposed system has to protect the base layer preferentially to compose the SVC signal, and the remaining enhanced layers are protected in order to meet the video quality requirements. With the proposed system, it is possible to lessen the effects of the channel environment, thereby ensuring the video quality, because the base layer and enhanced layers are able to implement the differential coding rate in the proposed system based on the different data sizes.