Error Prediction Based Redundancy Control for Robust Transmission of Video Over Wireless Links

The loss of UDP/IP packets has a high impact on the quality of the low-rate video streaming, since one UDP/IP packet typically represents a considerable part of a picture, which is discarded and concealed if an error was detected by a UDP checksum. In this work we propose a method that allows for the utilization of error-free parts of such UDP packets. The detection of errors is facilitated by the use of CRC (cyclic redundancy check) information of the smaller link layer packets. Resynchronization of the variable length code at the beginning of the link layer packets is provided by using side information. To keep the additional rate small and to have low distortion at the same time, we propose sending the side information depending on the prediction of the channel quality. Experimental results show a considerable improvement in video quality at the receiver.