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QoS-guaranteed packet scheduling in wireless networks

The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 63-67页

作者： ZHANG Deng-yin JIANG Juan anani adi LI Hai-bo Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Department of Applied Physics and Electronics Umea University Umea 90187 Sweden

To guarantee the quality of service （QoS） of a wireless network, a new packet scheduling algorithm using cross-layer design technique is proposed in this article. First, the demand of packet scheduling for multimedia transmission in wireless networks and the deficiency of the existing packet scheduling algorithms are analyzed. Then the model of the QoS-gnaranteed packet scheduling （QPS） algorithm of high speed downlink packet access （HSDPA） and the cost function of packet transmission are designed. The calculation method of packet delay time for wireless channels is expounded in detail, and complete steps to realize the QPS algorithm are also given. The simulation results show that the QPS algorithm that provides the scheduling sequence of packets with calculated values can effectively improve the performance of delay and throughput.

关键词： packet scheduling QoS wireless network cross-layer design

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M-learning in review： Technology, standard and evaluation

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通讯和计算机（中英文版） 2008年第11期5卷 1-6页

作者： anani adi ZHANG Deng-yin LI Hai-bo Digital Media Laboratory Department of Applied Physics and Electronics Umea University Umea 90187 Sweden Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

Nowadays E-learning as a form of learning depending on networks and computer devices has been expanding by leaps and bounds. As a special kind of E-learning, M-learning (mobile learning) aims at the use of mobile devices anywhere at anytime by anybody. In this paper, the technologies to develop a M-learning system are deeply analyzed according to the layer model at first. Then, from the view of application, the standardization in M-learning is researched in order to accelerate the development and popularization of M-learning. Finally, quality estimation of M-learning system is discussed from the view of QoE (quality of experiences). The experience form end-user is the sole effective norm to judge the result of M-learning technology. It is no doubt that technologies, standardization and evaluation will play very important parts in the course of M-learning development.

关键词：电子学习移动设备移动学习系统技术创新

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An adaptive image watermarking algorithm based on perceptual model

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通讯和计算机（中英文版） 2008年第2期5卷 1-6,18页

作者： ZHANG Deng-yin CHEN Jia-ping anani adi LI Hai-bo Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Digital Media Laboratory Department of Applied Physics and Electronics Umea University Umea 90187 Sweden

An adaptive image watermarking algorithm based on Watson s perceptual model is proposed in this paper. The proposed watermarking algorithm fully considers image regional characteristic. First, the cover image is divided into different smooth regions according to its gray value. Then watermark adjustment factors of those different regions are calculated respectively based on Watson s perceptual *** watermark is embedded by the adjustment factors at last. Experiments show that the proposed algorithm has excellent imperceptibility and has little influence uponthe eigenvalue of the cover image.

关键词：水印图象处理技术识别技术灰度值

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