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Because of the requirements of high precision and low encoding complexity, H.264 video coding standard used UMHexagonS algorithm as a viable implementation plan for Block Motion Estimation. This paper has made the improvement to the UMHexagonS algorithm, reflected in two aspects: In the search process of this algorithm has added the adaptive threshold value and played a role ahead of deadline in the...
Traceback is the technique to trace packets back to the sources or the routers near the sources, which is essential while defending against IP spoofing and denial of service attacks. In this paper we present the design of QuIT (Quantitative IP traceback) system which can trace the origin of a single packet and figure out the distribution of packets from each source. QuIT generates audit trails for...
In this paper, we consider the downlink scenario of a cellular cooperative OFDM network, in which the vacant user in the cell could serve as relay for the base station and forward the downlink data streams. With the channel information of the users in the cell, the base station not only allocates the power and subchannels to the users, but also decides the relay strategy for each subchannel. We derive...
This paper focuses on subchannel and power allocation problem in OFDMA-based decode-and-forward (DF) cooperative relay networks. The objective of this problem is to maximize the total data rate under the constraints of joint total transmission power and subchannels occupation, while maintaining the maximum fairness among multiple relay nodes. We transform this mixed integer programming problem to...
CAS (short for "complex adaptive system") theory advanced by Holland broke through the limitation of previous study on the complex systems from a new visual angle. This paper introduces in detail the origin and development, traits, applications and the meaning on methodologies of the theory. The study of the system complexity is very important in the contemporary scientific study. CAS theory...
Yang Yi-Xian (1987) presented a public-key distribution system based on Dickson polynomials. V. Varadharajan, (1989) commented on it and showed that the choice of parameters of such a system is quite significant in its design. In this Letter, it is pointed out, by analysing the computational complexity of this system, that this system is insecure no matter how the system parameters are chosen and...
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