Novel mobile video transmission system for off-road navigation services

One of the problems faced in vehicular transmission systems is the protection of highly sensitive real-time video information against multipath fading environments. The technique proposed is the implementation of a M-level QAM scheme in association with a novel fade estimation and compensation technique. A half-pilot symbol assisted modulation scheme, HP-SAM, a Reed-Solomon error correction coding as well as a non-uniform partitioning of the signal constellation are also used. They result in considerable improvements in the bit and frame error rate performance. It is essential that the video is encoded with high compression rate. In this paper, we also propose a highly efficient interframe coding technique that uses transmission via separate channels, each having differing degrees of error protection. The main focus of this paper is on the transmission aspects of the scheme and the performance enhancement they can provide. The codec is currently under development.