A Joint Optimized Transmission Scheme Based on M-QAM and UEP for Wireless Scalable Video

摘要

M-QAM is a modulation technology with high spectral efficiency, due to the property of Gray-coded constellation phasor where different bits have distinct anti-noise ability. Scalable video coding has the ability to transmit partial bit streams thus reconstruct lower video quality according to the channel status to cater for the channel fluctuation. A rate-distortion optimized (RDO) wireless video streaming algorithm is proposed, in which the allocation of M-QAM subchannels, the numbers of scalable video layers, and channel coding protection priorities for different layers are considered jointly. Compared with the EEP without considering prioritized sub-channels, the proposed algorithm derives PSNR gain about 1.5-2dB, and demonstrates the robustness of the video streaming over wireless channels