Abstract
In recent years, wavelet has been largely discussed in literature, and proposed for next generation of multimedia compression standards. In this thesis, we present a new wavelet-based video coding system with enhanced error resilience ability. This system is designed for the Experimental Communication Payload (ECP) project of ROCSAT-1, in which high-bit-rate digital broadcasting experiments over Ka-band channel is performed. The characteristic of Ka-band channel is considered to be so unpredictable as depending on the climate and atmospheric situations. The noise present in channel may corrupt transmitted video bit-stream. However, judgment of video quality is very objective. Therefore, there are many methods capable of making deficiency of video sequence imperceptible even if channel degradation is severe. For this reason, a sophisticated codec is necessary. As MPEG-2, our proposed system includes complete bit-stream syntax. This layered structure facilitates error resilience ability. For combating random errors resulted from AWGN channel, BCH codes are added as error protection codes. They also provide unequal error protection for data with different priorities. Although it imposes more bit requirement, the error resilience ability will be greatly strengthened. This can be observed in presented experimental results. Our system has better performance in error-prone environment than MPEG-2, but worse in error-free environment. There exists a trade off between compression efficiency and error resilience ability.