Error resilient H.264 coded video transmission over wireless channels

摘要

The H.264/AVC recommendation was first published in 2003 and builds on the concepts of earlier standards such as MPEG-2 and MPEG-4. The H.264 recommendation represents an evolution of the existing video coding standards andudwas developed in response to the growing need for higher compression. Even though H.264 provides for greater compression, H.264 compressed video streams are veryudprone to channel errors in mobile wireless fading channels such as 3G due to high error rates experienced.udCommon video compression techniques include motion compensation, prediction methods, transformation, quantization and entropy coding, which are the commonudelements of a hybrid video codecs. The ITU-T recommendation H.264 introduces several new error resilience tools, as well as several new features such as Intra Prediction and Deblocking Filter.udThe channel model used for the testing was the Rayleigh Fading channel with the noise component simulated as Additive White Gaussian Noise (AWGN) using QPSK as the modulation technique. The channel was used over several Eb/N0 values to provide similar bit error rates as those found in the literature.udThough further research needs to be conducted, results have shown that when using the H.264 error resilience tools in protecting encoded bitstreams to minor channel errors improvement in the decoded video quality can be observed. The tools did not perform as well with mild and severe channel errors significant as the resultant bitstream was too corrupted. From this, further research in channel coding techniques is needed to determine if the bitstream can be protected from these sorts of error rates