Channel-adaptive error protection for scalable audio streaming over wireless Internet
Streaming high-fidelity audio over networks with both bit errors and packet erasures is becoming increasingly important due to the emerging of wireless Internet. In this paper, we propose an end-to-end architecture for scalable audio streaming over wireless Internet. Considering the characteristic of scalable audio, a novel layered product code is presented to handle bit errors and packet losses simultaneously. Specifically, unequal row channel code and unequal column code are adopted for different layers of scalable audio based on their quality impacts. Moreover, rate-distortion based bit allocation is proposed to determine each channel-coding rate and the source-coding rate so as to minimize the expected end-to-end distortion. The simulation results demonstrate the effectiveness of our proposed error protection scheme.