Novel Motion-JPEG2000 video transmission system over CDMA environment

Abstract

The paper proposes a transmission system for Motion-JPEG2000 video in mobile communications. In Motion JPEG2000, video data are compressed in frames according to JPEG2000 part1. In JPEG2000 part1 encoding, an input image is coded in the order of significant sub-bands, which are low-frequency bands. The proposed transmission system therefore assigns each sub-band data suitable weights according to their significance by using orthogonal multi-code CDMA so that bit errors are concentrated in the high-frequency sub-bands which are of little significance on image reconstruction. Concretely speaking, copies of significant sub-band data are made and the copied data are orthogonally multiplexed. The multiplexed data are averaged in the receiver so that the bit errors of significant sub-bands are reduced. On the other hand, the other sub-band data are not copied in order to increase transmission rates. Furthermore, audio data are transmitted with high quality by orthogonal multiplexing. The proposed system adaptively performs the above process for video and audio data. Moreover, these proposed systems are effective in the progressive order of LRCP (layer - resolution level - component - position) and of RLCP (resolution level - layer - component - position) on JPEG2000. Simulation results demonstrate that the proposed system can improve image quality compared with the conventional transmission system under the same BER.