Adaptive Layered Video Transmission with Channel Characteristics

In wireless video transmission, the layered video transmission combining with a layered video coding can gracefully accommodate the receivers' heterogeneity. In this paper, we propose a new layered video transmission scheme based on the wireless channel characteristics of orthogonal frequency division multiplexing OFDM physical PHY layer, leading to an adaptive layered video transmission ALAVIT. In our scheme, scalable video coding SVC is exploited to generate the layered video bit-streams; and the resulted base layer BL and enhancement layer EL bits are modulated differently to obtain their individual symbols. According to the estimated channel characteristics described by the H parameters of a connected wireless receiver, subcarriers with good channel quality and more power are allocated to BL symbols for the protection of these important bits. As compared to the state-of-the-art PHY layer techniques such as s-mod and MixCast, our ALAVIT scheme is able to provide a better performance.