TAILIEUCHUNG - Báo cáo " Congestion control of Wavelet image compression over wireless networks "

The demand of transmission of images and video is increasing quickly recently and researchers are trying to invest good solutions to improve the quality of these over wireless networks. There are still challenges due to the different characteristics and quality of images between wired and wireless channels. An important issue is congestion control to ensure network stability and achieve a reasonably fair distribution of the network resources among the users. | VNU Journal of Science Mathematics - Physics 23 2007 55-62 Congestion control of Wavelet image compression over wireless networks Ho Anh Tuy1 Nguyen Vinh An2 1 Hanoi. University of Technology 1 Dai Co Viet Hai Ba Trung Hanoi Vietnam 2Hanoi Open University Building B101 Back Khoa Hai Ba Trung Hanoi Vietnam Received 6 April 2007 Abstract. The demand of transmission of images and video is increasing quickly recently and researchers are trying to invest good solutions to improve the quality of these over wireless networks. There are still challenges due to the different characteristics and quality of images between wired and wireless channels. An important issue is congestion control to ensure network stability and achieve a reasonably fair distribution of the network resources among the users. The paper will present a model of congestion control by combining Wavelet image compression at the source with applying Fuzzy logic technique to control traffics. The simulation shows a good result the transmission rate can be adjusted to adapt the changes of wireless channel the buffer of intermediate devices will not be swung from idle to overflow or vice versa so that the cell loss rate is small. 1. Introduction For transmission of image over wireless channels it is important to have a robust system when the channel conditions vary as a function of time. Traditional systems use a DCT transform for image compression and then matched to the bit rate for which the channel code is designed. DCT is one of the most popular technologies for image processing including JPEG standard MPEG standards ect. There are some problems with this system. Firstly the system breaks down very fast if the SNR falls below the design level. Secondly DCT will cause the blockness artifact when the compressing ratio over 50 1. Thirdly the image services are limited by the poor quality and low compression ratio. Lastly the systems are much suffered by varying of the bit rate over channel. Wavelet .

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