Application of the VLC parallel transmission technique to motion vector transmission

Recently portable computers and mobile communications have been developed r apidly. Along with the developments of mobile computing environment, the de mands of transmitting images over wireless channels are growing. However, h igh efficiency image coding techniques are not designed for the wireless co mmunication channels. The use of variable length codes (VLCs) in those codi ng techniques makes a receiver hard to synchronize with the codewords on th e noisy channel. On the other hand, a variable length code transmission tec hnique utilizing multicode CDM (Code Division Multiplex) has been proposed. In this paper, the multicode CDM technique is applied to wireless transmis sion of images compressed by the H.263 algorithm. Especially, the proposed technique is employed for motion vector transmission. In consequence, the p roposed transmission technique reduces the required E-b/N-o as compared wit h the conventional transmission technique.