Weizhang Xu

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In this paper, an improved Raptor decoding algorithm of 3GPP MBMS (Multimedia Broadcast /Multicast Services)standard is presented. Compared with the algorithm suggested in 3GPP, the improved algorithm adds preprocessing in the generator matrix. The simulation results demonstrate that the algorithm presented in the paper greatly improves the decoding speed(More)
Motion Estimation(ME) plays an important role in digital video compression, since it can significantly affect the image accuracy and the compression ratio. Also, motion estimation process is a part of the encoder which is high complex and computation-intensive, therefore it hinders real-time applications of H.264 video compression. To reduce computational(More)
Multimedia application on mobile phone platform is a hot topic in Information Technology industry accompanying with the advances of technologies in Internet, smart operating system and wireless network. The development of streaming media technology boosts the audio and video application over the Internet. This paper describes a mobile video live streaming(More)
The digital innovation of transmitters is one of key technologies for digital SW & MW broadcasting. Aiming at the transmitters using EER(Envelop Elimination and Restoration) technology, the paper discussed the key problems in digital innovation practice, and the conclusion of the effects on digital broadcasting signal quality of the problems are also(More)
With the analysis of the ICI (Inter-Channel Interference) in OFDM system, this paper proposed a high-efficiency spectrum utilization scheme for multi-channel DAB signals, based on the theoretical value of ICI in mathematics. In this scheme, there is no RF spectrum reserved interval between the DAB channels. 1. Background The DAB (Digital Audio Broadcasting)(More)
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