An Optimal UEP Scheme of Audio Transmission over MIMO Wireless Links

In this paper, we present an optimal UEP framework for transmitting packetized audio streams over MIMO wireless links. Our proposed framework aims at maximizing the expected end-to-end Segmented SNR of a received audio sequence. It reduces the packetization overhead of small audio frames while protecting audio streams against temporarily correlated bit errors introduced by wireless transmission medium. To reduce the packetization overhead, our framework suggests a frame grouping technique distributing the transmission overhead of one packet among multiple audio frames. To mitigate the effects of random bit errors, our framework utilizes a UEP RS channel coding scheme to assign parity bits according to the combined perceptual importance of frames embedded in individual packets.